Ignore:
Timestamp:
Mar 26, 2012, 7:21:18 AM (7 years ago)
Author:
julian.reschke@…
Message:

re-org sections

Location:
draft-ietf-httpbis/latest
Files:
2 edited

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  • draft-ietf-httpbis/latest/p2-semantics.html

    r1617 r1618  
    488488      <link rel="Chapter" title="5 Representation" href="#rfc.section.5">
    489489      <link rel="Chapter" title="6 Method Definitions" href="#rfc.section.6">
    490       <link rel="Chapter" title="7 Status Code Definitions" href="#rfc.section.7">
    491       <link rel="Chapter" title="8 Common Protocol Parameters" href="#rfc.section.8">
    492       <link rel="Chapter" title="9 Header Field Definitions" href="#rfc.section.9">
    493       <link rel="Chapter" title="10 IANA Considerations" href="#rfc.section.10">
    494       <link rel="Chapter" title="11 Security Considerations" href="#rfc.section.11">
    495       <link rel="Chapter" title="12 Acknowledgments" href="#rfc.section.12">
    496       <link rel="Chapter" href="#rfc.section.13" title="13 References">
     490      <link rel="Chapter" title="7 Common Protocol Parameters" href="#rfc.section.7">
     491      <link rel="Chapter" title="8 Header Field Definitions" href="#rfc.section.8">
     492      <link rel="Chapter" title="9 IANA Considerations" href="#rfc.section.9">
     493      <link rel="Chapter" title="10 Security Considerations" href="#rfc.section.10">
     494      <link rel="Chapter" title="11 Acknowledgments" href="#rfc.section.11">
     495      <link rel="Chapter" href="#rfc.section.12" title="12 References">
    497496      <link rel="Appendix" title="A Changes from RFC 2616" href="#rfc.section.A">
    498497      <link rel="Appendix" title="B Collected ABNF" href="#rfc.section.B">
     
    619618                  </ul>
    620619               </li>
     620               <li>4.3&nbsp;&nbsp;&nbsp;<a href="#status.codes">Status Code Definitions</a><ul>
     621                     <li>4.3.1&nbsp;&nbsp;&nbsp;<a href="#status.1xx">Informational 1xx</a><ul>
     622                           <li>4.3.1.1&nbsp;&nbsp;&nbsp;<a href="#status.100">100 Continue</a></li>
     623                           <li>4.3.1.2&nbsp;&nbsp;&nbsp;<a href="#status.101">101 Switching Protocols</a></li>
     624                        </ul>
     625                     </li>
     626                     <li>4.3.2&nbsp;&nbsp;&nbsp;<a href="#status.2xx">Successful 2xx</a><ul>
     627                           <li>4.3.2.1&nbsp;&nbsp;&nbsp;<a href="#status.200">200 OK</a></li>
     628                           <li>4.3.2.2&nbsp;&nbsp;&nbsp;<a href="#status.201">201 Created</a></li>
     629                           <li>4.3.2.3&nbsp;&nbsp;&nbsp;<a href="#status.202">202 Accepted</a></li>
     630                           <li>4.3.2.4&nbsp;&nbsp;&nbsp;<a href="#status.203">203 Non-Authoritative Information</a></li>
     631                           <li>4.3.2.5&nbsp;&nbsp;&nbsp;<a href="#status.204">204 No Content</a></li>
     632                           <li>4.3.2.6&nbsp;&nbsp;&nbsp;<a href="#status.205">205 Reset Content</a></li>
     633                        </ul>
     634                     </li>
     635                     <li>4.3.3&nbsp;&nbsp;&nbsp;<a href="#status.3xx">Redirection 3xx</a><ul>
     636                           <li>4.3.3.1&nbsp;&nbsp;&nbsp;<a href="#status.300">300 Multiple Choices</a></li>
     637                           <li>4.3.3.2&nbsp;&nbsp;&nbsp;<a href="#status.301">301 Moved Permanently</a></li>
     638                           <li>4.3.3.3&nbsp;&nbsp;&nbsp;<a href="#status.302">302 Found</a></li>
     639                           <li>4.3.3.4&nbsp;&nbsp;&nbsp;<a href="#status.303">303 See Other</a></li>
     640                           <li>4.3.3.5&nbsp;&nbsp;&nbsp;<a href="#status.305">305 Use Proxy</a></li>
     641                           <li>4.3.3.6&nbsp;&nbsp;&nbsp;<a href="#status.306">306 (Unused)</a></li>
     642                           <li>4.3.3.7&nbsp;&nbsp;&nbsp;<a href="#status.307">307 Temporary Redirect</a></li>
     643                        </ul>
     644                     </li>
     645                     <li>4.3.4&nbsp;&nbsp;&nbsp;<a href="#status.4xx">Client Error 4xx</a><ul>
     646                           <li>4.3.4.1&nbsp;&nbsp;&nbsp;<a href="#status.400">400 Bad Request</a></li>
     647                           <li>4.3.4.2&nbsp;&nbsp;&nbsp;<a href="#status.402">402 Payment Required</a></li>
     648                           <li>4.3.4.3&nbsp;&nbsp;&nbsp;<a href="#status.403">403 Forbidden</a></li>
     649                           <li>4.3.4.4&nbsp;&nbsp;&nbsp;<a href="#status.404">404 Not Found</a></li>
     650                           <li>4.3.4.5&nbsp;&nbsp;&nbsp;<a href="#status.405">405 Method Not Allowed</a></li>
     651                           <li>4.3.4.6&nbsp;&nbsp;&nbsp;<a href="#status.406">406 Not Acceptable</a></li>
     652                           <li>4.3.4.7&nbsp;&nbsp;&nbsp;<a href="#status.408">408 Request Timeout</a></li>
     653                           <li>4.3.4.8&nbsp;&nbsp;&nbsp;<a href="#status.409">409 Conflict</a></li>
     654                           <li>4.3.4.9&nbsp;&nbsp;&nbsp;<a href="#status.410">410 Gone</a></li>
     655                           <li>4.3.4.10&nbsp;&nbsp;&nbsp;<a href="#status.411">411 Length Required</a></li>
     656                           <li>4.3.4.11&nbsp;&nbsp;&nbsp;<a href="#status.413">413 Request Representation Too Large</a></li>
     657                           <li>4.3.4.12&nbsp;&nbsp;&nbsp;<a href="#status.414">414 URI Too Long</a></li>
     658                           <li>4.3.4.13&nbsp;&nbsp;&nbsp;<a href="#status.415">415 Unsupported Media Type</a></li>
     659                           <li>4.3.4.14&nbsp;&nbsp;&nbsp;<a href="#status.417">417 Expectation Failed</a></li>
     660                           <li>4.3.4.15&nbsp;&nbsp;&nbsp;<a href="#status.426">426 Upgrade Required</a></li>
     661                        </ul>
     662                     </li>
     663                     <li>4.3.5&nbsp;&nbsp;&nbsp;<a href="#status.5xx">Server Error 5xx</a><ul>
     664                           <li>4.3.5.1&nbsp;&nbsp;&nbsp;<a href="#status.500">500 Internal Server Error</a></li>
     665                           <li>4.3.5.2&nbsp;&nbsp;&nbsp;<a href="#status.501">501 Not Implemented</a></li>
     666                           <li>4.3.5.3&nbsp;&nbsp;&nbsp;<a href="#status.502">502 Bad Gateway</a></li>
     667                           <li>4.3.5.4&nbsp;&nbsp;&nbsp;<a href="#status.503">503 Service Unavailable</a></li>
     668                           <li>4.3.5.5&nbsp;&nbsp;&nbsp;<a href="#status.504">504 Gateway Timeout</a></li>
     669                           <li>4.3.5.6&nbsp;&nbsp;&nbsp;<a href="#status.505">505 HTTP Version Not Supported</a></li>
     670                        </ul>
     671                     </li>
     672                  </ul>
     673               </li>
    621674            </ul>
    622675         </li>
     
    641694            </ul>
    642695         </li>
    643          <li>7.&nbsp;&nbsp;&nbsp;<a href="#status.codes">Status Code Definitions</a><ul>
    644                <li>7.1&nbsp;&nbsp;&nbsp;<a href="#status.1xx">Informational 1xx</a><ul>
    645                      <li>7.1.1&nbsp;&nbsp;&nbsp;<a href="#status.100">100 Continue</a></li>
    646                      <li>7.1.2&nbsp;&nbsp;&nbsp;<a href="#status.101">101 Switching Protocols</a></li>
    647                   </ul>
    648                </li>
    649                <li>7.2&nbsp;&nbsp;&nbsp;<a href="#status.2xx">Successful 2xx</a><ul>
    650                      <li>7.2.1&nbsp;&nbsp;&nbsp;<a href="#status.200">200 OK</a></li>
    651                      <li>7.2.2&nbsp;&nbsp;&nbsp;<a href="#status.201">201 Created</a></li>
    652                      <li>7.2.3&nbsp;&nbsp;&nbsp;<a href="#status.202">202 Accepted</a></li>
    653                      <li>7.2.4&nbsp;&nbsp;&nbsp;<a href="#status.203">203 Non-Authoritative Information</a></li>
    654                      <li>7.2.5&nbsp;&nbsp;&nbsp;<a href="#status.204">204 No Content</a></li>
    655                      <li>7.2.6&nbsp;&nbsp;&nbsp;<a href="#status.205">205 Reset Content</a></li>
    656                   </ul>
    657                </li>
    658                <li>7.3&nbsp;&nbsp;&nbsp;<a href="#status.3xx">Redirection 3xx</a><ul>
    659                      <li>7.3.1&nbsp;&nbsp;&nbsp;<a href="#status.300">300 Multiple Choices</a></li>
    660                      <li>7.3.2&nbsp;&nbsp;&nbsp;<a href="#status.301">301 Moved Permanently</a></li>
    661                      <li>7.3.3&nbsp;&nbsp;&nbsp;<a href="#status.302">302 Found</a></li>
    662                      <li>7.3.4&nbsp;&nbsp;&nbsp;<a href="#status.303">303 See Other</a></li>
    663                      <li>7.3.5&nbsp;&nbsp;&nbsp;<a href="#status.305">305 Use Proxy</a></li>
    664                      <li>7.3.6&nbsp;&nbsp;&nbsp;<a href="#status.306">306 (Unused)</a></li>
    665                      <li>7.3.7&nbsp;&nbsp;&nbsp;<a href="#status.307">307 Temporary Redirect</a></li>
    666                   </ul>
    667                </li>
    668                <li>7.4&nbsp;&nbsp;&nbsp;<a href="#status.4xx">Client Error 4xx</a><ul>
    669                      <li>7.4.1&nbsp;&nbsp;&nbsp;<a href="#status.400">400 Bad Request</a></li>
    670                      <li>7.4.2&nbsp;&nbsp;&nbsp;<a href="#status.402">402 Payment Required</a></li>
    671                      <li>7.4.3&nbsp;&nbsp;&nbsp;<a href="#status.403">403 Forbidden</a></li>
    672                      <li>7.4.4&nbsp;&nbsp;&nbsp;<a href="#status.404">404 Not Found</a></li>
    673                      <li>7.4.5&nbsp;&nbsp;&nbsp;<a href="#status.405">405 Method Not Allowed</a></li>
    674                      <li>7.4.6&nbsp;&nbsp;&nbsp;<a href="#status.406">406 Not Acceptable</a></li>
    675                      <li>7.4.7&nbsp;&nbsp;&nbsp;<a href="#status.408">408 Request Timeout</a></li>
    676                      <li>7.4.8&nbsp;&nbsp;&nbsp;<a href="#status.409">409 Conflict</a></li>
    677                      <li>7.4.9&nbsp;&nbsp;&nbsp;<a href="#status.410">410 Gone</a></li>
    678                      <li>7.4.10&nbsp;&nbsp;&nbsp;<a href="#status.411">411 Length Required</a></li>
    679                      <li>7.4.11&nbsp;&nbsp;&nbsp;<a href="#status.413">413 Request Representation Too Large</a></li>
    680                      <li>7.4.12&nbsp;&nbsp;&nbsp;<a href="#status.414">414 URI Too Long</a></li>
    681                      <li>7.4.13&nbsp;&nbsp;&nbsp;<a href="#status.415">415 Unsupported Media Type</a></li>
    682                      <li>7.4.14&nbsp;&nbsp;&nbsp;<a href="#status.417">417 Expectation Failed</a></li>
    683                      <li>7.4.15&nbsp;&nbsp;&nbsp;<a href="#status.426">426 Upgrade Required</a></li>
    684                   </ul>
    685                </li>
    686                <li>7.5&nbsp;&nbsp;&nbsp;<a href="#status.5xx">Server Error 5xx</a><ul>
    687                      <li>7.5.1&nbsp;&nbsp;&nbsp;<a href="#status.500">500 Internal Server Error</a></li>
    688                      <li>7.5.2&nbsp;&nbsp;&nbsp;<a href="#status.501">501 Not Implemented</a></li>
    689                      <li>7.5.3&nbsp;&nbsp;&nbsp;<a href="#status.502">502 Bad Gateway</a></li>
    690                      <li>7.5.4&nbsp;&nbsp;&nbsp;<a href="#status.503">503 Service Unavailable</a></li>
    691                      <li>7.5.5&nbsp;&nbsp;&nbsp;<a href="#status.504">504 Gateway Timeout</a></li>
    692                      <li>7.5.6&nbsp;&nbsp;&nbsp;<a href="#status.505">505 HTTP Version Not Supported</a></li>
    693                   </ul>
    694                </li>
     696         <li>7.&nbsp;&nbsp;&nbsp;<a href="#common.protocol.parameters">Common Protocol Parameters</a><ul>
     697               <li>7.1&nbsp;&nbsp;&nbsp;<a href="#http.date">Date/Time Formats</a></li>
     698               <li>7.2&nbsp;&nbsp;&nbsp;<a href="#product.tokens">Product Tokens</a></li>
    695699            </ul>
    696700         </li>
    697          <li>8.&nbsp;&nbsp;&nbsp;<a href="#common.protocol.parameters">Common Protocol Parameters</a><ul>
    698                <li>8.1&nbsp;&nbsp;&nbsp;<a href="#http.date">Date/Time Formats</a></li>
    699                <li>8.2&nbsp;&nbsp;&nbsp;<a href="#product.tokens">Product Tokens</a></li>
     701         <li>8.&nbsp;&nbsp;&nbsp;<a href="#header.field.definitions">Header Field Definitions</a><ul>
     702               <li>8.1&nbsp;&nbsp;&nbsp;<a href="#header.allow">Allow</a></li>
     703               <li>8.2&nbsp;&nbsp;&nbsp;<a href="#header.date">Date</a></li>
     704               <li>8.3&nbsp;&nbsp;&nbsp;<a href="#header.expect">Expect</a></li>
     705               <li>8.4&nbsp;&nbsp;&nbsp;<a href="#header.from">From</a></li>
     706               <li>8.5&nbsp;&nbsp;&nbsp;<a href="#header.location">Location</a></li>
     707               <li>8.6&nbsp;&nbsp;&nbsp;<a href="#header.max-forwards">Max-Forwards</a></li>
     708               <li>8.7&nbsp;&nbsp;&nbsp;<a href="#header.referer">Referer</a></li>
     709               <li>8.8&nbsp;&nbsp;&nbsp;<a href="#header.retry-after">Retry-After</a></li>
     710               <li>8.9&nbsp;&nbsp;&nbsp;<a href="#header.server">Server</a></li>
     711               <li>8.10&nbsp;&nbsp;&nbsp;<a href="#header.user-agent">User-Agent</a></li>
    700712            </ul>
    701713         </li>
    702          <li>9.&nbsp;&nbsp;&nbsp;<a href="#header.field.definitions">Header Field Definitions</a><ul>
    703                <li>9.1&nbsp;&nbsp;&nbsp;<a href="#header.allow">Allow</a></li>
    704                <li>9.2&nbsp;&nbsp;&nbsp;<a href="#header.date">Date</a></li>
    705                <li>9.3&nbsp;&nbsp;&nbsp;<a href="#header.expect">Expect</a></li>
    706                <li>9.4&nbsp;&nbsp;&nbsp;<a href="#header.from">From</a></li>
    707                <li>9.5&nbsp;&nbsp;&nbsp;<a href="#header.location">Location</a></li>
    708                <li>9.6&nbsp;&nbsp;&nbsp;<a href="#header.max-forwards">Max-Forwards</a></li>
    709                <li>9.7&nbsp;&nbsp;&nbsp;<a href="#header.referer">Referer</a></li>
    710                <li>9.8&nbsp;&nbsp;&nbsp;<a href="#header.retry-after">Retry-After</a></li>
    711                <li>9.9&nbsp;&nbsp;&nbsp;<a href="#header.server">Server</a></li>
    712                <li>9.10&nbsp;&nbsp;&nbsp;<a href="#header.user-agent">User-Agent</a></li>
     714         <li>9.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
     715               <li>9.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
     716               <li>9.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
     717               <li>9.3&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
    713718            </ul>
    714719         </li>
    715          <li>10.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
    716                <li>10.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
    717                <li>10.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
    718                <li>10.3&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
     720         <li>10.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
     721               <li>10.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
     722               <li>10.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
     723               <li>10.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></li>
     724               <li>10.4&nbsp;&nbsp;&nbsp;<a href="#rfc.section.10.4">Security Considerations for CONNECT</a></li>
    719725            </ul>
    720726         </li>
    721          <li>11.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
    722                <li>11.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
    723                <li>11.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
    724                <li>11.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></li>
    725                <li>11.4&nbsp;&nbsp;&nbsp;<a href="#rfc.section.11.4">Security Considerations for CONNECT</a></li>
    726             </ul>
    727          </li>
    728          <li>12.&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
    729          <li>13.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
    730                <li>13.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    731                <li>13.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     727         <li>11.&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
     728         <li>12.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
     729               <li>12.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     730               <li>12.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    732731            </ul>
    733732         </li>
     
    817816      </p>
    818817      <div id="rfc.figure.u.3"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  <a href="#method" class="smpl">method</a>         = <a href="#core.rules" class="smpl">token</a>
    819 </pre><p id="rfc.section.2.p.3">The list of methods allowed by a resource can be specified in an Allow header field (<a href="#header.allow" id="rfc.xref.header.allow.1" title="Allow">Section&nbsp;9.1</a>). The status code of the response always notifies the client whether a method is currently allowed on a resource, since the
     818</pre><p id="rfc.section.2.p.3">The list of methods allowed by a resource can be specified in an Allow header field (<a href="#header.allow" id="rfc.xref.header.allow.1" title="Allow">Section&nbsp;8.1</a>). The status code of the response always notifies the client whether a method is currently allowed on a resource, since the
    820819         set of allowed methods can change dynamically. An origin server <em class="bcp14">SHOULD</em> respond with the status code 405 (Method Not Allowed) if the method is known by the origin server but not allowed for the
    821820         resource, and 501 (Not Implemented) if the method is unrecognized or not implemented by the origin server. The methods GET
     
    10031002               <tr>
    10041003                  <td class="left">Expect</td>
    1005                   <td class="left"><a href="#header.expect" id="rfc.xref.header.expect.1" title="Expect">Section&nbsp;9.3</a></td>
     1004                  <td class="left"><a href="#header.expect" id="rfc.xref.header.expect.1" title="Expect">Section&nbsp;8.3</a></td>
    10061005               </tr>
    10071006               <tr>
    10081007                  <td class="left">From</td>
    1009                   <td class="left"><a href="#header.from" id="rfc.xref.header.from.1" title="From">Section&nbsp;9.4</a></td>
     1008                  <td class="left"><a href="#header.from" id="rfc.xref.header.from.1" title="From">Section&nbsp;8.4</a></td>
    10101009               </tr>
    10111010               <tr>
     
    10351034               <tr>
    10361035                  <td class="left">Max-Forwards</td>
    1037                   <td class="left"><a href="#header.max-forwards" id="rfc.xref.header.max-forwards.1" title="Max-Forwards">Section&nbsp;9.6</a></td>
     1036                  <td class="left"><a href="#header.max-forwards" id="rfc.xref.header.max-forwards.1" title="Max-Forwards">Section&nbsp;8.6</a></td>
    10381037               </tr>
    10391038               <tr>
     
    10471046               <tr>
    10481047                  <td class="left">Referer</td>
    1049                   <td class="left"><a href="#header.referer" id="rfc.xref.header.referer.1" title="Referer">Section&nbsp;9.7</a></td>
     1048                  <td class="left"><a href="#header.referer" id="rfc.xref.header.referer.1" title="Referer">Section&nbsp;8.7</a></td>
    10501049               </tr>
    10511050               <tr>
     
    10551054               <tr>
    10561055                  <td class="left">User-Agent</td>
    1057                   <td class="left"><a href="#header.user-agent" id="rfc.xref.header.user-agent.1" title="User-Agent">Section&nbsp;9.10</a></td>
     1056                  <td class="left"><a href="#header.user-agent" id="rfc.xref.header.user-agent.1" title="User-Agent">Section&nbsp;8.10</a></td>
    10581057               </tr>
    10591058            </tbody>
     
    10831082               <tr>
    10841083                  <td class="left">Allow</td>
    1085                   <td class="left"><a href="#header.allow" id="rfc.xref.header.allow.2" title="Allow">Section&nbsp;9.1</a></td>
     1084                  <td class="left"><a href="#header.allow" id="rfc.xref.header.allow.2" title="Allow">Section&nbsp;8.1</a></td>
    10861085               </tr>
    10871086               <tr>
    10881087                  <td class="left">Date</td>
    1089                   <td class="left"><a href="#header.date" id="rfc.xref.header.date.1" title="Date">Section&nbsp;9.2</a></td>
     1088                  <td class="left"><a href="#header.date" id="rfc.xref.header.date.1" title="Date">Section&nbsp;8.2</a></td>
    10901089               </tr>
    10911090               <tr>
     
    10951094               <tr>
    10961095                  <td class="left">Location</td>
    1097                   <td class="left"><a href="#header.location" id="rfc.xref.header.location.1" title="Location">Section&nbsp;9.5</a></td>
     1096                  <td class="left"><a href="#header.location" id="rfc.xref.header.location.1" title="Location">Section&nbsp;8.5</a></td>
    10981097               </tr>
    10991098               <tr>
     
    11031102               <tr>
    11041103                  <td class="left">Retry-After</td>
    1105                   <td class="left"><a href="#header.retry-after" id="rfc.xref.header.retry-after.1" title="Retry-After">Section&nbsp;9.8</a></td>
     1104                  <td class="left"><a href="#header.retry-after" id="rfc.xref.header.retry-after.1" title="Retry-After">Section&nbsp;8.8</a></td>
    11061105               </tr>
    11071106               <tr>
    11081107                  <td class="left">Server</td>
    1109                   <td class="left"><a href="#header.server" id="rfc.xref.header.server.1" title="Server">Section&nbsp;9.9</a></td>
     1108                  <td class="left"><a href="#header.server" id="rfc.xref.header.server.1" title="Server">Section&nbsp;8.9</a></td>
    11101109               </tr>
    11111110               <tr>
     
    11331132         information which will explain the unusual status.
    11341133      </p>
     1134      <p id="rfc.section.4.p.5">The first digit of the status-code defines the class of response. The last two digits do not have any categorization role.
     1135         There are 5 values for the first digit:
     1136      </p>
     1137      <ul>
     1138         <li>1xx: Informational - Request received, continuing process</li>
     1139         <li>2xx: Success - The action was successfully received, understood, and accepted</li>
     1140         <li>3xx: Redirection - Further action needs to be taken in order to complete the request</li>
     1141         <li>4xx: Client Error - The request contains bad syntax or cannot be fulfilled</li>
     1142         <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
     1143      </ul>
    11351144      <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="overview.of.status.codes" href="#overview.of.status.codes">Overview of Status Codes</a></h2>
    1136       <p id="rfc.section.4.1.p.1">The status codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;7</a> of this specification, <a href="p4-conditional.html#status.code.definitions" title="Status Code Definitions">Section 4</a> of <a href="#Part4" id="rfc.xref.Part4.6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p5-range.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part5" id="rfc.xref.Part5.4"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, and <a href="p7-auth.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part7" id="rfc.xref.Part7.5"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>. The reason phrases listed here are only recommendations — they can be replaced by local equivalents without affecting the
     1145      <p id="rfc.section.4.1.p.1">The status codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;4.3</a> of this specification, <a href="p4-conditional.html#status.code.definitions" title="Status Code Definitions">Section 4</a> of <a href="#Part4" id="rfc.xref.Part4.6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p5-range.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part5" id="rfc.xref.Part5.4"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, and <a href="p7-auth.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part7" id="rfc.xref.Part7.5"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>. The reason phrases listed here are only recommendations — they can be replaced by local equivalents without affecting the
    11371146         protocol.
    11381147      </p>
     
    11501159                  <td class="left">100</td>
    11511160                  <td class="left">Continue</td>
    1152                   <td class="left"><a href="#status.100" id="rfc.xref.status.100.1" title="100 Continue">Section&nbsp;7.1.1</a></td>
     1161                  <td class="left"><a href="#status.100" id="rfc.xref.status.100.1" title="100 Continue">Section&nbsp;4.3.1.1</a></td>
    11531162               </tr>
    11541163               <tr>
    11551164                  <td class="left">101</td>
    11561165                  <td class="left">Switching Protocols</td>
    1157                   <td class="left"><a href="#status.101" id="rfc.xref.status.101.1" title="101 Switching Protocols">Section&nbsp;7.1.2</a></td>
     1166                  <td class="left"><a href="#status.101" id="rfc.xref.status.101.1" title="101 Switching Protocols">Section&nbsp;4.3.1.2</a></td>
    11581167               </tr>
    11591168               <tr>
    11601169                  <td class="left">200</td>
    11611170                  <td class="left">OK</td>
    1162                   <td class="left"><a href="#status.200" id="rfc.xref.status.200.1" title="200 OK">Section&nbsp;7.2.1</a></td>
     1171                  <td class="left"><a href="#status.200" id="rfc.xref.status.200.1" title="200 OK">Section&nbsp;4.3.2.1</a></td>
    11631172               </tr>
    11641173               <tr>
    11651174                  <td class="left">201</td>
    11661175                  <td class="left">Created</td>
    1167                   <td class="left"><a href="#status.201" id="rfc.xref.status.201.1" title="201 Created">Section&nbsp;7.2.2</a></td>
     1176                  <td class="left"><a href="#status.201" id="rfc.xref.status.201.1" title="201 Created">Section&nbsp;4.3.2.2</a></td>
    11681177               </tr>
    11691178               <tr>
    11701179                  <td class="left">202</td>
    11711180                  <td class="left">Accepted</td>
    1172                   <td class="left"><a href="#status.202" id="rfc.xref.status.202.1" title="202 Accepted">Section&nbsp;7.2.3</a></td>
     1181                  <td class="left"><a href="#status.202" id="rfc.xref.status.202.1" title="202 Accepted">Section&nbsp;4.3.2.3</a></td>
    11731182               </tr>
    11741183               <tr>
    11751184                  <td class="left">203</td>
    11761185                  <td class="left">Non-Authoritative Information</td>
    1177                   <td class="left"><a href="#status.203" id="rfc.xref.status.203.1" title="203 Non-Authoritative Information">Section&nbsp;7.2.4</a></td>
     1186                  <td class="left"><a href="#status.203" id="rfc.xref.status.203.1" title="203 Non-Authoritative Information">Section&nbsp;4.3.2.4</a></td>
    11781187               </tr>
    11791188               <tr>
    11801189                  <td class="left">204</td>
    11811190                  <td class="left">No Content</td>
    1182                   <td class="left"><a href="#status.204" id="rfc.xref.status.204.1" title="204 No Content">Section&nbsp;7.2.5</a></td>
     1191                  <td class="left"><a href="#status.204" id="rfc.xref.status.204.1" title="204 No Content">Section&nbsp;4.3.2.5</a></td>
    11831192               </tr>
    11841193               <tr>
    11851194                  <td class="left">205</td>
    11861195                  <td class="left">Reset Content</td>
    1187                   <td class="left"><a href="#status.205" id="rfc.xref.status.205.1" title="205 Reset Content">Section&nbsp;7.2.6</a></td>
     1196                  <td class="left"><a href="#status.205" id="rfc.xref.status.205.1" title="205 Reset Content">Section&nbsp;4.3.2.6</a></td>
    11881197               </tr>
    11891198               <tr>
     
    11951204                  <td class="left">300</td>
    11961205                  <td class="left">Multiple Choices</td>
    1197                   <td class="left"><a href="#status.300" id="rfc.xref.status.300.1" title="300 Multiple Choices">Section&nbsp;7.3.1</a></td>
     1206                  <td class="left"><a href="#status.300" id="rfc.xref.status.300.1" title="300 Multiple Choices">Section&nbsp;4.3.3.1</a></td>
    11981207               </tr>
    11991208               <tr>
    12001209                  <td class="left">301</td>
    12011210                  <td class="left">Moved Permanently</td>
    1202                   <td class="left"><a href="#status.301" id="rfc.xref.status.301.1" title="301 Moved Permanently">Section&nbsp;7.3.2</a></td>
     1211                  <td class="left"><a href="#status.301" id="rfc.xref.status.301.1" title="301 Moved Permanently">Section&nbsp;4.3.3.2</a></td>
    12031212               </tr>
    12041213               <tr>
    12051214                  <td class="left">302</td>
    12061215                  <td class="left">Found</td>
    1207                   <td class="left"><a href="#status.302" id="rfc.xref.status.302.1" title="302 Found">Section&nbsp;7.3.3</a></td>
     1216                  <td class="left"><a href="#status.302" id="rfc.xref.status.302.1" title="302 Found">Section&nbsp;4.3.3.3</a></td>
    12081217               </tr>
    12091218               <tr>
    12101219                  <td class="left">303</td>
    12111220                  <td class="left">See Other</td>
    1212                   <td class="left"><a href="#status.303" id="rfc.xref.status.303.1" title="303 See Other">Section&nbsp;7.3.4</a></td>
     1221                  <td class="left"><a href="#status.303" id="rfc.xref.status.303.1" title="303 See Other">Section&nbsp;4.3.3.4</a></td>
    12131222               </tr>
    12141223               <tr>
     
    12201229                  <td class="left">305</td>
    12211230                  <td class="left">Use Proxy</td>
    1222                   <td class="left"><a href="#status.305" id="rfc.xref.status.305.1" title="305 Use Proxy">Section&nbsp;7.3.5</a></td>
     1231                  <td class="left"><a href="#status.305" id="rfc.xref.status.305.1" title="305 Use Proxy">Section&nbsp;4.3.3.5</a></td>
    12231232               </tr>
    12241233               <tr>
    12251234                  <td class="left">307</td>
    12261235                  <td class="left">Temporary Redirect</td>
    1227                   <td class="left"><a href="#status.307" id="rfc.xref.status.307.1" title="307 Temporary Redirect">Section&nbsp;7.3.7</a></td>
     1236                  <td class="left"><a href="#status.307" id="rfc.xref.status.307.1" title="307 Temporary Redirect">Section&nbsp;4.3.3.7</a></td>
    12281237               </tr>
    12291238               <tr>
    12301239                  <td class="left">400</td>
    12311240                  <td class="left">Bad Request</td>
    1232                   <td class="left"><a href="#status.400" id="rfc.xref.status.400.1" title="400 Bad Request">Section&nbsp;7.4.1</a></td>
     1241                  <td class="left"><a href="#status.400" id="rfc.xref.status.400.1" title="400 Bad Request">Section&nbsp;4.3.4.1</a></td>
    12331242               </tr>
    12341243               <tr>
     
    12401249                  <td class="left">402</td>
    12411250                  <td class="left">Payment Required</td>
    1242                   <td class="left"><a href="#status.402" id="rfc.xref.status.402.1" title="402 Payment Required">Section&nbsp;7.4.2</a></td>
     1251                  <td class="left"><a href="#status.402" id="rfc.xref.status.402.1" title="402 Payment Required">Section&nbsp;4.3.4.2</a></td>
    12431252               </tr>
    12441253               <tr>
    12451254                  <td class="left">403</td>
    12461255                  <td class="left">Forbidden</td>
    1247                   <td class="left"><a href="#status.403" id="rfc.xref.status.403.1" title="403 Forbidden">Section&nbsp;7.4.3</a></td>
     1256                  <td class="left"><a href="#status.403" id="rfc.xref.status.403.1" title="403 Forbidden">Section&nbsp;4.3.4.3</a></td>
    12481257               </tr>
    12491258               <tr>
    12501259                  <td class="left">404</td>
    12511260                  <td class="left">Not Found</td>
    1252                   <td class="left"><a href="#status.404" id="rfc.xref.status.404.1" title="404 Not Found">Section&nbsp;7.4.4</a></td>
     1261                  <td class="left"><a href="#status.404" id="rfc.xref.status.404.1" title="404 Not Found">Section&nbsp;4.3.4.4</a></td>
    12531262               </tr>
    12541263               <tr>
    12551264                  <td class="left">405</td>
    12561265                  <td class="left">Method Not Allowed</td>
    1257                   <td class="left"><a href="#status.405" id="rfc.xref.status.405.1" title="405 Method Not Allowed">Section&nbsp;7.4.5</a></td>
     1266                  <td class="left"><a href="#status.405" id="rfc.xref.status.405.1" title="405 Method Not Allowed">Section&nbsp;4.3.4.5</a></td>
    12581267               </tr>
    12591268               <tr>
    12601269                  <td class="left">406</td>
    12611270                  <td class="left">Not Acceptable</td>
    1262                   <td class="left"><a href="#status.406" id="rfc.xref.status.406.1" title="406 Not Acceptable">Section&nbsp;7.4.6</a></td>
     1271                  <td class="left"><a href="#status.406" id="rfc.xref.status.406.1" title="406 Not Acceptable">Section&nbsp;4.3.4.6</a></td>
    12631272               </tr>
    12641273               <tr>
     
    12701279                  <td class="left">408</td>
    12711280                  <td class="left">Request Time-out</td>
    1272                   <td class="left"><a href="#status.408" id="rfc.xref.status.408.1" title="408 Request Timeout">Section&nbsp;7.4.7</a></td>
     1281                  <td class="left"><a href="#status.408" id="rfc.xref.status.408.1" title="408 Request Timeout">Section&nbsp;4.3.4.7</a></td>
    12731282               </tr>
    12741283               <tr>
    12751284                  <td class="left">409</td>
    12761285                  <td class="left">Conflict</td>
    1277                   <td class="left"><a href="#status.409" id="rfc.xref.status.409.1" title="409 Conflict">Section&nbsp;7.4.8</a></td>
     1286                  <td class="left"><a href="#status.409" id="rfc.xref.status.409.1" title="409 Conflict">Section&nbsp;4.3.4.8</a></td>
    12781287               </tr>
    12791288               <tr>
    12801289                  <td class="left">410</td>
    12811290                  <td class="left">Gone</td>
    1282                   <td class="left"><a href="#status.410" id="rfc.xref.status.410.1" title="410 Gone">Section&nbsp;7.4.9</a></td>
     1291                  <td class="left"><a href="#status.410" id="rfc.xref.status.410.1" title="410 Gone">Section&nbsp;4.3.4.9</a></td>
    12831292               </tr>
    12841293               <tr>
    12851294                  <td class="left">411</td>
    12861295                  <td class="left">Length Required</td>
    1287                   <td class="left"><a href="#status.411" id="rfc.xref.status.411.1" title="411 Length Required">Section&nbsp;7.4.10</a></td>
     1296                  <td class="left"><a href="#status.411" id="rfc.xref.status.411.1" title="411 Length Required">Section&nbsp;4.3.4.10</a></td>
    12881297               </tr>
    12891298               <tr>
     
    12951304                  <td class="left">413</td>
    12961305                  <td class="left">Request Representation Too Large</td>
    1297                   <td class="left"><a href="#status.413" id="rfc.xref.status.413.1" title="413 Request Representation Too Large">Section&nbsp;7.4.11</a></td>
     1306                  <td class="left"><a href="#status.413" id="rfc.xref.status.413.1" title="413 Request Representation Too Large">Section&nbsp;4.3.4.11</a></td>
    12981307               </tr>
    12991308               <tr>
    13001309                  <td class="left">414</td>
    13011310                  <td class="left">URI Too Long</td>
    1302                   <td class="left"><a href="#status.414" id="rfc.xref.status.414.1" title="414 URI Too Long">Section&nbsp;7.4.12</a></td>
     1311                  <td class="left"><a href="#status.414" id="rfc.xref.status.414.1" title="414 URI Too Long">Section&nbsp;4.3.4.12</a></td>
    13031312               </tr>
    13041313               <tr>
    13051314                  <td class="left">415</td>
    13061315                  <td class="left">Unsupported Media Type</td>
    1307                   <td class="left"><a href="#status.415" id="rfc.xref.status.415.1" title="415 Unsupported Media Type">Section&nbsp;7.4.13</a></td>
     1316                  <td class="left"><a href="#status.415" id="rfc.xref.status.415.1" title="415 Unsupported Media Type">Section&nbsp;4.3.4.13</a></td>
    13081317               </tr>
    13091318               <tr>
     
    13151324                  <td class="left">417</td>
    13161325                  <td class="left">Expectation Failed</td>
    1317                   <td class="left"><a href="#status.417" id="rfc.xref.status.417.1" title="417 Expectation Failed">Section&nbsp;7.4.14</a></td>
     1326                  <td class="left"><a href="#status.417" id="rfc.xref.status.417.1" title="417 Expectation Failed">Section&nbsp;4.3.4.14</a></td>
    13181327               </tr>
    13191328               <tr>
    13201329                  <td class="left">426</td>
    13211330                  <td class="left">Upgrade Required</td>
    1322                   <td class="left"><a href="#status.426" id="rfc.xref.status.426.1" title="426 Upgrade Required">Section&nbsp;7.4.15</a></td>
     1331                  <td class="left"><a href="#status.426" id="rfc.xref.status.426.1" title="426 Upgrade Required">Section&nbsp;4.3.4.15</a></td>
    13231332               </tr>
    13241333               <tr>
    13251334                  <td class="left">500</td>
    13261335                  <td class="left">Internal Server Error</td>
    1327                   <td class="left"><a href="#status.500" id="rfc.xref.status.500.1" title="500 Internal Server Error">Section&nbsp;7.5.1</a></td>
     1336                  <td class="left"><a href="#status.500" id="rfc.xref.status.500.1" title="500 Internal Server Error">Section&nbsp;4.3.5.1</a></td>
    13281337               </tr>
    13291338               <tr>
    13301339                  <td class="left">501</td>
    13311340                  <td class="left">Not Implemented</td>
    1332                   <td class="left"><a href="#status.501" id="rfc.xref.status.501.1" title="501 Not Implemented">Section&nbsp;7.5.2</a></td>
     1341                  <td class="left"><a href="#status.501" id="rfc.xref.status.501.1" title="501 Not Implemented">Section&nbsp;4.3.5.2</a></td>
    13331342               </tr>
    13341343               <tr>
    13351344                  <td class="left">502</td>
    13361345                  <td class="left">Bad Gateway</td>
    1337                   <td class="left"><a href="#status.502" id="rfc.xref.status.502.1" title="502 Bad Gateway">Section&nbsp;7.5.3</a></td>
     1346                  <td class="left"><a href="#status.502" id="rfc.xref.status.502.1" title="502 Bad Gateway">Section&nbsp;4.3.5.3</a></td>
    13381347               </tr>
    13391348               <tr>
    13401349                  <td class="left">503</td>
    13411350                  <td class="left">Service Unavailable</td>
    1342                   <td class="left"><a href="#status.503" id="rfc.xref.status.503.1" title="503 Service Unavailable">Section&nbsp;7.5.4</a></td>
     1351                  <td class="left"><a href="#status.503" id="rfc.xref.status.503.1" title="503 Service Unavailable">Section&nbsp;4.3.5.4</a></td>
    13431352               </tr>
    13441353               <tr>
    13451354                  <td class="left">504</td>
    13461355                  <td class="left">Gateway Time-out</td>
    1347                   <td class="left"><a href="#status.504" id="rfc.xref.status.504.1" title="504 Gateway Timeout">Section&nbsp;7.5.5</a></td>
     1356                  <td class="left"><a href="#status.504" id="rfc.xref.status.504.1" title="504 Gateway Timeout">Section&nbsp;4.3.5.5</a></td>
    13481357               </tr>
    13491358               <tr>
    13501359                  <td class="left">505</td>
    13511360                  <td class="left">HTTP Version not supported</td>
    1352                   <td class="left"><a href="#status.505" id="rfc.xref.status.505.1" title="505 HTTP Version Not Supported">Section&nbsp;7.5.6</a></td>
     1361                  <td class="left"><a href="#status.505" id="rfc.xref.status.505.1" title="505 HTTP Version Not Supported">Section&nbsp;4.3.5.6</a></td>
    13531362               </tr>
    13541363            </tbody>
     
    13741383         that are required, those that modify the semantics of the response).
    13751384      </p>
    1376       <p id="rfc.section.4.2.1.p.4">New HTTP status codes are required to fall under one of the categories defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;7</a>. To allow existing parsers to properly handle them, new status codes cannot disallow a response body, although they can mandate
     1385      <p id="rfc.section.4.2.1.p.4">New HTTP status codes are required to fall under one of the categories defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;4.3</a>. To allow existing parsers to properly handle them, new status codes cannot disallow a response body, although they can mandate
    13771386         a zero-length response body. They can require the presence of one or more particular HTTP response header(s).
    13781387      </p>
    13791388      <p id="rfc.section.4.2.1.p.5">Likewise, their definitions can specify that caches are allowed to use heuristics to determine their freshness (see <a href="#Part6" id="rfc.xref.Part6.5"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>; by default, it is not allowed), and can define how to determine the resource which they carry a representation for (see <a href="#identifying.response.associated.with.representation" title="Identifying the Resource Associated with a Representation">Section&nbsp;5.1</a>; by default, it is anonymous).
    13801389      </p>
    1381       <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="representation" href="#representation">Representation</a></h1>
    1382       <p id="rfc.section.5.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer a representation if not otherwise restricted by the request method or response status code. A representation consists
    1383          of metadata (representation header fields) and data (representation body). When a complete or partial representation is enclosed
    1384          in an HTTP message, it is referred to as the payload of the message. HTTP representations are defined in <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    1385       </p>
    1386       <p id="rfc.section.5.p.2">A representation body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.26"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The representation body is obtained from the message body by decoding any Transfer-Encoding that might have been applied
    1387          to ensure safe and proper transfer of the message.
    1388       </p>
    1389       <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="identifying.response.associated.with.representation" href="#identifying.response.associated.with.representation">Identifying the Resource Associated with a Representation</a></h2>
    1390       <p id="rfc.section.5.1.p.1">It is sometimes necessary to determine an identifier for the resource associated with a representation.</p>
    1391       <p id="rfc.section.5.1.p.2">An HTTP request representation, when present, is always associated with an anonymous (i.e., unidentified) resource.</p>
    1392       <p id="rfc.section.5.1.p.3">In the common case, an HTTP response is a representation of the target resource (see <a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.27"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). However, this is not always the case. To determine the URI of the resource a response is associated with, the following
    1393          rules are used (with the first applicable one being selected):
    1394       </p>
    1395       <ol>
    1396          <li>If the response status code is 200 or 203 and the request method was GET, the response payload is a representation of the
    1397             target resource.
    1398          </li>
    1399          <li>If the response status code is 204, 206, or 304 and the request method was GET or HEAD, the response payload is a partial
    1400             representation of the target resource.
    1401          </li>
    1402          <li>If the response has a Content-Location header field, and that URI is the same as the effective request URI, the response payload
    1403             is a representation of the target resource.
    1404          </li>
    1405          <li>If the response has a Content-Location header field, and that URI is not the same as the effective request URI, then the response
    1406             asserts that its payload is a representation of the resource identified by the Content-Location URI. However, such an assertion
    1407             cannot be trusted unless it can be verified by other means (not defined by HTTP).
    1408          </li>
    1409          <li>Otherwise, the response is a representation of an anonymous (i.e., unidentified) resource.</li>
    1410       </ol>
    1411       <p id="rfc.section.5.1.p.5"> <span class="comment" id="TODO-req-uri">[<a href="#TODO-req-uri" class="smpl">TODO-req-uri</a>: The comparison function is going to have to be defined somewhere, because we already need to compare URIs for things like
    1412             cache invalidation.]</span>
    1413       </p>
    1414       <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="method.definitions" href="#method.definitions">Method Definitions</a></h1>
    1415       <p id="rfc.section.6.p.1">The set of common request methods for HTTP/1.1 is defined below. Although this set can be expanded, additional methods cannot
    1416          be assumed to share the same semantics for separately extended clients and servers.
    1417       </p>
    1418       <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="safe.and.idempotent" href="#safe.and.idempotent">Safe and Idempotent Methods</a></h2>
    1419       <div id="rfc.iref.s.1"></div>
    1420       <h3 id="rfc.section.6.1.1"><a href="#rfc.section.6.1.1">6.1.1</a>&nbsp;<a id="safe.methods" href="#safe.methods">Safe Methods</a></h3>
    1421       <p id="rfc.section.6.1.1.p.1">Implementors need to be aware that the software represents the user in their interactions over the Internet, and need to allow
    1422          the user to be aware of any actions they take which might have an unexpected significance to themselves or others.
    1423       </p>
    1424       <p id="rfc.section.6.1.1.p.2">In particular, the convention has been established that the GET, HEAD, OPTIONS, and TRACE request methods <em class="bcp14">SHOULD NOT</em> have the significance of taking an action other than retrieval. These request methods ought to be considered "<dfn id="safe">safe</dfn>". This allows user agents to represent other methods, such as POST, PUT and DELETE, in a special way, so that the user is
    1425          made aware of the fact that a possibly unsafe action is being requested.
    1426       </p>
    1427       <p id="rfc.section.6.1.1.p.3">Naturally, it is not possible to ensure that the server does not generate side-effects as a result of performing a GET request;
    1428          in fact, some dynamic resources consider that a feature. The important distinction here is that the user did not request the
    1429          side-effects, so therefore cannot be held accountable for them.
    1430       </p>
    1431       <div id="rfc.iref.i.1"></div>
    1432       <h3 id="rfc.section.6.1.2"><a href="#rfc.section.6.1.2">6.1.2</a>&nbsp;<a id="idempotent.methods" href="#idempotent.methods">Idempotent Methods</a></h3>
    1433       <p id="rfc.section.6.1.2.p.1">Request methods can also have the property of "idempotence" in that, aside from error or expiration issues, the intended effect
    1434          of multiple identical requests is the same as for a single request. PUT, DELETE, and all safe request methods are idempotent.
    1435          It is important to note that idempotence refers only to changes requested by the client: a server is free to change its state
    1436          due to multiple requests for the purpose of tracking those requests, versioning of results, etc.
    1437       </p>
    1438       <h2 id="rfc.section.6.2"><a href="#rfc.section.6.2">6.2</a>&nbsp;<a id="OPTIONS" href="#OPTIONS">OPTIONS</a></h2>
    1439       <div id="rfc.iref.o.1"></div>
    1440       <div id="rfc.iref.m.1"></div>
    1441       <p id="rfc.section.6.2.p.1">The OPTIONS method requests information about the communication options available on the request/response chain identified
    1442          by the effective request URI. This method allows a client to determine the options and/or requirements associated with a resource,
    1443          or the capabilities of a server, without implying a resource action or initiating a resource retrieval.
    1444       </p>
    1445       <p id="rfc.section.6.2.p.2">Responses to the OPTIONS method are not cacheable.</p>
    1446       <p id="rfc.section.6.2.p.3">If the OPTIONS request includes a message body (as indicated by the presence of Content-Length or Transfer-Encoding), then
    1447          the media type <em class="bcp14">MUST</em> be indicated by a Content-Type field. Although this specification does not define any use for such a body, future extensions
    1448          to HTTP might use the OPTIONS body to make more detailed queries on the server.
    1449       </p>
    1450       <p id="rfc.section.6.2.p.4">If the request-target (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is an asterisk ("*"), the OPTIONS request is intended to apply to the server in general rather than to a specific resource.
    1451          Since a server's communication options typically depend on the resource, the "*" request is only useful as a "ping" or "no-op"
    1452          type of method; it does nothing beyond allowing the client to test the capabilities of the server. For example, this can be
    1453          used to test a proxy for HTTP/1.1 conformance (or lack thereof).
    1454       </p>
    1455       <p id="rfc.section.6.2.p.5">If the request-target is not an asterisk, the OPTIONS request applies only to the options that are available when communicating
    1456          with that resource.
    1457       </p>
    1458       <p id="rfc.section.6.2.p.6">A 200 response <em class="bcp14">SHOULD</em> include any header fields that indicate optional features implemented by the server and applicable to that resource (e.g.,
    1459          Allow), possibly including extensions not defined by this specification. The response body, if any, <em class="bcp14">SHOULD</em> also include information about the communication options. The format for such a body is not defined by this specification,
    1460          but might be defined by future extensions to HTTP. Content negotiation <em class="bcp14">MAY</em> be used to select the appropriate response format. If no response body is included, the response <em class="bcp14">MUST</em> include a Content-Length field with a field-value of "0".
    1461       </p>
    1462       <p id="rfc.section.6.2.p.7">The Max-Forwards header field <em class="bcp14">MAY</em> be used to target a specific proxy in the request chain (see <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.2" title="Max-Forwards">Section&nbsp;9.6</a>). If no Max-Forwards field is present in the request, then the forwarded request <em class="bcp14">MUST NOT</em> include a Max-Forwards field.
    1463       </p>
    1464       <h2 id="rfc.section.6.3"><a href="#rfc.section.6.3">6.3</a>&nbsp;<a id="GET" href="#GET">GET</a></h2>
    1465       <div id="rfc.iref.g.5"></div>
    1466       <div id="rfc.iref.m.2"></div>
    1467       <p id="rfc.section.6.3.p.1">The GET method requests transfer of a current representation of the target resource.</p>
    1468       <p id="rfc.section.6.3.p.2">If the target resource is a data-producing process, it is the produced data which shall be returned as the representation
    1469          in the response and not the source text of the process, unless that text happens to be the output of the process.
    1470       </p>
    1471       <p id="rfc.section.6.3.p.3">The semantics of the GET method change to a "conditional GET" if the request message includes an If-Modified-Since, If-Unmodified-Since,
    1472          If-Match, If-None-Match, or If-Range header field. A conditional GET requests that the representation be transferred only
    1473          under the circumstances described by the conditional header field(s). The conditional GET request is intended to reduce unnecessary
    1474          network usage by allowing cached representations to be refreshed without requiring multiple requests or transferring data
    1475          already held by the client.
    1476       </p>
    1477       <p id="rfc.section.6.3.p.4">The semantics of the GET method change to a "partial GET" if the request message includes a Range header field. A partial
    1478          GET requests that only part of the representation be transferred, as described in <a href="p5-range.html#header.range" title="Range">Section 5.4</a> of <a href="#Part5" id="rfc.xref.Part5.7"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>. The partial GET request is intended to reduce unnecessary network usage by allowing partially-retrieved representations
    1479          to be completed without transferring data already held by the client.
    1480       </p>
    1481       <p id="rfc.section.6.3.p.5">Bodies on GET requests have no defined semantics. Note that sending a body on a GET request might cause some existing implementations
    1482          to reject the request.
    1483       </p>
    1484       <p id="rfc.section.6.3.p.6">The response to a GET request is cacheable and <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests (see <a href="#Part6" id="rfc.xref.Part6.6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    1485       </p>
    1486       <p id="rfc.section.6.3.p.7">See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;11.2</a> for security considerations when used for forms.
    1487       </p>
    1488       <h2 id="rfc.section.6.4"><a href="#rfc.section.6.4">6.4</a>&nbsp;<a id="HEAD" href="#HEAD">HEAD</a></h2>
    1489       <div id="rfc.iref.h.1"></div>
    1490       <div id="rfc.iref.m.3"></div>
    1491       <p id="rfc.section.6.4.p.1">The HEAD method is identical to GET except that the server <em class="bcp14">MUST NOT</em> return a message body in the response. The metadata contained in the HTTP header fields in response to a HEAD request <em class="bcp14">SHOULD</em> be identical to the information sent in response to a GET request. This method can be used for obtaining metadata about the
    1492          representation implied by the request without transferring the representation body. This method is often used for testing
    1493          hypertext links for validity, accessibility, and recent modification.
    1494       </p>
    1495       <p id="rfc.section.6.4.p.2">The response to a HEAD request is cacheable and <em class="bcp14">MAY</em> be used to satisfy a subsequent HEAD request. It also has potential side effects on previously stored responses to GET; see <a href="p6-cache.html#head.effects" title="Updating Caches with HEAD Responses">Section 2.5</a> of <a href="#Part6" id="rfc.xref.Part6.7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>.
    1496       </p>
    1497       <p id="rfc.section.6.4.p.3">Bodies on HEAD requests have no defined semantics. Note that sending a body on a HEAD request might cause some existing implementations
    1498          to reject the request.
    1499       </p>
    1500       <div id="rfc.iref.p.1"></div>
    1501       <div id="rfc.iref.m.4"></div>
    1502       <h2 id="rfc.section.6.5"><a href="#rfc.section.6.5">6.5</a>&nbsp;<a id="POST" href="#POST">POST</a></h2>
    1503       <p id="rfc.section.6.5.p.1">The POST method requests that the origin server accept the representation enclosed in the request as data to be processed
    1504          by the target resource. POST is designed to allow a uniform method to cover the following functions:
    1505       </p>
    1506       <ul>
    1507          <li>Annotation of existing resources;</li>
    1508          <li>Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles;</li>
    1509          <li>Providing a block of data, such as the result of submitting a form, to a data-handling process;</li>
    1510          <li>Extending a database through an append operation.</li>
    1511       </ul>
    1512       <p id="rfc.section.6.5.p.2">The actual function performed by the POST method is determined by the server and is usually dependent on the effective request
    1513          URI.
    1514       </p>
    1515       <p id="rfc.section.6.5.p.3">The action performed by the POST method might not result in a resource that can be identified by a URI. In this case, either
    1516          200 (OK) or 204 (No Content) is the appropriate response status code, depending on whether or not the response includes a
    1517          representation that describes the result.
    1518       </p>
    1519       <p id="rfc.section.6.5.p.4">If a resource has been created on the origin server, the response <em class="bcp14">SHOULD</em> be 201 (Created) and contain a representation which describes the status of the request and refers to the new resource, and
    1520          a Location header field (see <a href="#header.location" id="rfc.xref.header.location.2" title="Location">Section&nbsp;9.5</a>).
    1521       </p>
    1522       <p id="rfc.section.6.5.p.5">Responses to POST requests are only cacheable when they include explicit freshness information (see <a href="p6-cache.html#calculating.freshness.lifetime" title="Calculating Freshness Lifetime">Section 2.3.1</a> of <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). A cached POST response with a Content-Location header field (see <a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) whose value is the effective Request URI <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests.
    1523       </p>
    1524       <p id="rfc.section.6.5.p.6">Note that POST caching is not widely implemented. However, the 303 (See Other) response can be used to direct the user agent
    1525          to retrieve a cacheable representation of the resource.
    1526       </p>
    1527       <div id="rfc.iref.p.2"></div>
    1528       <div id="rfc.iref.m.5"></div>
    1529       <h2 id="rfc.section.6.6"><a href="#rfc.section.6.6">6.6</a>&nbsp;<a id="PUT" href="#PUT">PUT</a></h2>
    1530       <p id="rfc.section.6.6.p.1">The PUT method requests that the state of the target resource be created or replaced with the state defined by the representation
    1531          enclosed in the request message payload. A successful PUT of a given representation would suggest that a subsequent GET on
    1532          that same target resource will result in an equivalent representation being returned in a 200 (OK) response. However, there
    1533          is no guarantee that such a state change will be observable, since the target resource might be acted upon by other user agents
    1534          in parallel, or might be subject to dynamic processing by the origin server, before any subsequent GET is received. A successful
    1535          response only implies that the user agent's intent was achieved at the time of its processing by the origin server.
    1536       </p>
    1537       <p id="rfc.section.6.6.p.2">If the target resource does not have a current representation and the PUT successfully creates one, then the origin server <em class="bcp14">MUST</em> inform the user agent by sending a 201 (Created) response. If the target resource does have a current representation and that
    1538          representation is successfully modified in accordance with the state of the enclosed representation, then either a 200 (OK)
    1539          or 204 (No Content) response <em class="bcp14">SHOULD</em> be sent to indicate successful completion of the request.
    1540       </p>
    1541       <p id="rfc.section.6.6.p.3">Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored (i.e., not saved as part of the resource state).
    1542       </p>
    1543       <p id="rfc.section.6.6.p.4">An origin server <em class="bcp14">SHOULD</em> verify that the PUT representation is consistent with any constraints which the server has for the target resource that cannot
    1544          or will not be changed by the PUT. This is particularly important when the origin server uses internal configuration information
    1545          related to the URI in order to set the values for representation metadata on GET responses. When a PUT representation is inconsistent
    1546          with the target resource, the origin server <em class="bcp14">SHOULD</em> either make them consistent, by transforming the representation or changing the resource configuration, or respond with an
    1547          appropriate error message containing sufficient information to explain why the representation is unsuitable. The 409 (Conflict)
    1548          or 415 (Unsupported Media Type) status codes are suggested, with the latter being specific to constraints on Content-Type
    1549          values.
    1550       </p>
    1551       <p id="rfc.section.6.6.p.5">For example, if the target resource is configured to always have a Content-Type of "text/html" and the representation being
    1552          PUT has a Content-Type of "image/jpeg", then the origin server <em class="bcp14">SHOULD</em> do one of: (a) reconfigure the target resource to reflect the new media type; (b) transform the PUT representation to a format
    1553          consistent with that of the resource before saving it as the new resource state; or, (c) reject the request with a 415 response
    1554          indicating that the target resource is limited to "text/html", perhaps including a link to a different resource that would
    1555          be a suitable target for the new representation.
    1556       </p>
    1557       <p id="rfc.section.6.6.p.6">HTTP does not define exactly how a PUT method affects the state of an origin server beyond what can be expressed by the intent
    1558          of the user agent request and the semantics of the origin server response. It does not define what a resource might be, in
    1559          any sense of that word, beyond the interface provided via HTTP. It does not define how resource state is "stored", nor how
    1560          such storage might change as a result of a change in resource state, nor how the origin server translates resource state into
    1561          representations. Generally speaking, all implementation details behind the resource interface are intentionally hidden by
    1562          the server.
    1563       </p>
    1564       <p id="rfc.section.6.6.p.7">The fundamental difference between the POST and PUT methods is highlighted by the different intent for the target resource.
    1565          The target resource in a POST request is intended to handle the enclosed representation as a data-accepting process, such
    1566          as for a gateway to some other protocol or a document that accepts annotations. In contrast, the target resource in a PUT
    1567          request is intended to take the enclosed representation as a new or replacement value. Hence, the intent of PUT is idempotent
    1568          and visible to intermediaries, even though the exact effect is only known by the origin server.
    1569       </p>
    1570       <p id="rfc.section.6.6.p.8">Proper interpretation of a PUT request presumes that the user agent knows what target resource is desired. A service that
    1571          is intended to select a proper URI on behalf of the client, after receiving a state-changing request, <em class="bcp14">SHOULD</em> be implemented using the POST method rather than PUT. If the origin server will not make the requested PUT state change to
    1572          the target resource and instead wishes to have it applied to a different resource, such as when the resource has been moved
    1573          to a different URI, then the origin server <em class="bcp14">MUST</em> send a 301 (Moved Permanently) response; the user agent <em class="bcp14">MAY</em> then make its own decision regarding whether or not to redirect the request.
    1574       </p>
    1575       <p id="rfc.section.6.6.p.9">A PUT request applied to the target resource <em class="bcp14">MAY</em> have side-effects on other resources. For example, an article might have a URI for identifying "the current version" (a resource)
    1576          which is separate from the URIs identifying each particular version (different resources that at one point shared the same
    1577          state as the current version resource). A successful PUT request on "the current version" URI might therefore create a new
    1578          version resource in addition to changing the state of the target resource, and might also cause links to be added between
    1579          the related resources.
    1580       </p>
    1581       <p id="rfc.section.6.6.p.10">An origin server <em class="bcp14">SHOULD</em> reject any PUT request that contains a Content-Range header field, since it might be misinterpreted as partial content (or
    1582          might be partial content that is being mistakenly PUT as a full representation). Partial content updates are possible by targeting
    1583          a separately identified resource with state that overlaps a portion of the larger resource, or by using a different method
    1584          that has been specifically defined for partial updates (for example, the PATCH method defined in <a href="#RFC5789" id="rfc.xref.RFC5789.1"><cite title="PATCH Method for HTTP">[RFC5789]</cite></a>).
    1585       </p>
    1586       <p id="rfc.section.6.6.p.11">Responses to the PUT method are not cacheable. If a PUT request passes through a cache that has one or more stored responses
    1587          for the effective request URI, those stored responses will be invalidated (see <a href="p6-cache.html#invalidation.after.updates.or.deletions" title="Request Methods that Invalidate">Section 2.6</a> of <a href="#Part6" id="rfc.xref.Part6.9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    1588       </p>
    1589       <div id="rfc.iref.d.1"></div>
    1590       <div id="rfc.iref.m.6"></div>
    1591       <h2 id="rfc.section.6.7"><a href="#rfc.section.6.7">6.7</a>&nbsp;<a id="DELETE" href="#DELETE">DELETE</a></h2>
    1592       <p id="rfc.section.6.7.p.1">The DELETE method requests that the origin server delete the target resource. This method <em class="bcp14">MAY</em> be overridden by human intervention (or other means) on the origin server. The client cannot be guaranteed that the operation
    1593          has been carried out, even if the status code returned from the origin server indicates that the action has been completed
    1594          successfully. However, the server <em class="bcp14">SHOULD NOT</em> indicate success unless, at the time the response is given, it intends to delete the resource or move it to an inaccessible
    1595          location.
    1596       </p>
    1597       <p id="rfc.section.6.7.p.2">A successful response <em class="bcp14">SHOULD</em> be 200 (OK) if the response includes an representation describing the status, 202 (Accepted) if the action has not yet been
    1598          enacted, or 204 (No Content) if the action has been enacted but the response does not include a representation.
    1599       </p>
    1600       <p id="rfc.section.6.7.p.3">Bodies on DELETE requests have no defined semantics. Note that sending a body on a DELETE request might cause some existing
    1601          implementations to reject the request.
    1602       </p>
    1603       <p id="rfc.section.6.7.p.4">Responses to the DELETE method are not cacheable. If a DELETE request passes through a cache that has one or more stored responses
    1604          for the effective request URI, those stored responses will be invalidated (see <a href="p6-cache.html#invalidation.after.updates.or.deletions" title="Request Methods that Invalidate">Section 2.6</a> of <a href="#Part6" id="rfc.xref.Part6.10"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    1605       </p>
    1606       <h2 id="rfc.section.6.8"><a href="#rfc.section.6.8">6.8</a>&nbsp;<a id="TRACE" href="#TRACE">TRACE</a></h2>
    1607       <div id="rfc.iref.t.1"></div>
    1608       <div id="rfc.iref.m.7"></div>
    1609       <p id="rfc.section.6.8.p.1">The TRACE method requests a remote, application-layer loop-back of the request message. The final recipient of the request <em class="bcp14">SHOULD</em> reflect the message received back to the client as the message body of a 200 (OK) response. The final recipient is either
    1610          the origin server or the first proxy to receive a Max-Forwards value of zero (0) in the request (see <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.3" title="Max-Forwards">Section&nbsp;9.6</a>). A TRACE request <em class="bcp14">MUST NOT</em> include a message body.
    1611       </p>
    1612       <p id="rfc.section.6.8.p.2">TRACE allows the client to see what is being received at the other end of the request chain and use that data for testing
    1613          or diagnostic information. The value of the Via header field (<a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the Max-Forwards header field allows the
    1614          client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding messages in an
    1615          infinite loop.
    1616       </p>
    1617       <p id="rfc.section.6.8.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> have a Content-Type of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 7.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.30"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and contain a message body that encloses a copy of the entire request message. Responses to the TRACE method are not cacheable.
    1618       </p>
    1619       <div id="rfc.iref.c.1"></div>
    1620       <div id="rfc.iref.m.8"></div>
    1621       <h2 id="rfc.section.6.9"><a href="#rfc.section.6.9">6.9</a>&nbsp;<a id="CONNECT" href="#CONNECT">CONNECT</a></h2>
    1622       <p id="rfc.section.6.9.p.1">The CONNECT method requests that the proxy establish a tunnel to the request-target and, if successful, thereafter restrict
    1623          its behavior to blind forwarding of packets until the connection is closed.
    1624       </p>
    1625       <p id="rfc.section.6.9.p.2">When using CONNECT, the request-target <em class="bcp14">MUST</em> use the authority form (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.31"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>); i.e., the request-target consists of only the host name and port number of the tunnel destination, separated by a colon.
    1626          For example,
    1627       </p>
    1628       <div id="rfc.figure.u.6"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
    1629 Host: server.example.com:80
    1630 
    1631 </pre><p id="rfc.section.6.9.p.4">Any successful (2xx) response to a CONNECT request indicates that the proxy has established a connection to the requested
    1632          host and port, and has switched to tunneling the current connection to that server connection. The tunneled data from the
    1633          server begins immediately after the blank line that concludes the successful response's header block. A server <em class="bcp14">SHOULD NOT</em> send any Transfer-Encoding or Content-Length header fields in a successful response. A client <em class="bcp14">MUST</em> ignore any Content-Length or Transfer-Encoding header fields received in a successful response.
    1634       </p>
    1635       <p id="rfc.section.6.9.p.5">Any response other than a successful response indicates that the tunnel has not yet been formed and that the connection remains
    1636          governed by HTTP.
    1637       </p>
    1638       <p id="rfc.section.6.9.p.6">Proxy authentication might be used to establish the authority to create a tunnel:</p>
    1639       <div id="rfc.figure.u.7"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
    1640 Host: server.example.com:80
    1641 Proxy-Authorization: basic aGVsbG86d29ybGQ=
    1642 
    1643 </pre><p id="rfc.section.6.9.p.8">A message body on a CONNECT request has no defined semantics. Sending a body on a CONNECT request might cause existing implementations
    1644          to reject the request.
    1645       </p>
    1646       <p id="rfc.section.6.9.p.9">Similar to a pipelined HTTP/1.1 request, data to be tunneled from client to server <em class="bcp14">MAY</em> be sent immediately after the request (before a response is received). The usual caveats also apply: data may be discarded
    1647          if the eventual response is negative, and the connection may be reset with no response if more than one TCP segment is outstanding.
    1648       </p>
    1649       <p id="rfc.section.6.9.p.10">It may be the case that the proxy itself can only reach the requested origin server through another proxy. In this case, the
    1650          first proxy <em class="bcp14">SHOULD</em> make a CONNECT request of that next proxy, requesting a tunnel to the authority. A proxy <em class="bcp14">MUST NOT</em> respond with any 2xx status code unless it has either a direct or tunnel connection established to the authority.
    1651       </p>
    1652       <p id="rfc.section.6.9.p.11">If at any point either one of the peers gets disconnected, any outstanding data that came from that peer will be passed to
    1653          the other one, and after that also the other connection will be terminated by the proxy. If there is outstanding data to that
    1654          peer undelivered, that data will be discarded.
    1655       </p>
    1656       <p id="rfc.section.6.9.p.12">An origin server which receives a CONNECT request for itself <em class="bcp14">MAY</em> respond with a 2xx status code to indicate that a connection is established. However, most origin servers do not implement
    1657          CONNECT.
    1658       </p>
    1659       <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="status.codes" href="#status.codes">Status Code Definitions</a></h1>
    1660       <p id="rfc.section.7.p.1">The first digit of the status-code defines the class of response. The last two digits do not have any categorization role.
    1661          There are 5 values for the first digit:
    1662       </p>
    1663       <ul>
    1664          <li>1xx: Informational - Request received, continuing process</li>
    1665          <li>2xx: Success - The action was successfully received, understood, and accepted</li>
    1666          <li>3xx: Redirection - Further action needs to be taken in order to complete the request</li>
    1667          <li>4xx: Client Error - The request contains bad syntax or cannot be fulfilled</li>
    1668          <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
    1669       </ul>
    1670       <p id="rfc.section.7.p.2">Each status-code is described below, including any metadata required in the response.</p>
    1671       <p id="rfc.section.7.p.3">For most status codes the response can carry a payload, in which case a Content-Type header field indicates the payload's
    1672          media type (<a href="p3-payload.html#header.content-type" title="Content-Type">Section 6.8</a> of <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    1673       </p>
    1674       <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="status.1xx" href="#status.1xx">Informational 1xx</a></h2>
    1675       <p id="rfc.section.7.1.p.1">This class of status code indicates a provisional response, consisting only of the status-line and optional header fields,
     1390      <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="status.codes" href="#status.codes">Status Code Definitions</a></h2>
     1391      <p id="rfc.section.4.3.p.1">Each status-code is described below, including any metadata required in the response.</p>
     1392      <p id="rfc.section.4.3.p.2">For most status codes the response can carry a payload, in which case a Content-Type header field indicates the payload's
     1393         media type (<a href="p3-payload.html#header.content-type" title="Content-Type">Section 6.8</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
     1394      </p>
     1395      <h3 id="rfc.section.4.3.1"><a href="#rfc.section.4.3.1">4.3.1</a>&nbsp;<a id="status.1xx" href="#status.1xx">Informational 1xx</a></h3>
     1396      <p id="rfc.section.4.3.1.p.1">This class of status code indicates a provisional response, consisting only of the status-line and optional header fields,
    16761397         and is terminated by an empty line. There are no required header fields for this class of status code. Since HTTP/1.0 did
    16771398         not define any 1xx status codes, servers <em class="bcp14">MUST NOT</em> send a 1xx response to an HTTP/1.0 client except under experimental conditions.
    16781399      </p>
    1679       <p id="rfc.section.7.1.p.2">A client <em class="bcp14">MUST</em> be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100
     1400      <p id="rfc.section.4.3.1.p.2">A client <em class="bcp14">MUST</em> be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100
    16801401         (Continue) status message. Unexpected 1xx status responses <em class="bcp14">MAY</em> be ignored by a user agent.
    16811402      </p>
    1682       <p id="rfc.section.7.1.p.3">Proxies <em class="bcp14">MUST</em> forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself
     1403      <p id="rfc.section.4.3.1.p.3">Proxies <em class="bcp14">MUST</em> forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself
    16831404         requested the generation of the 1xx response. (For example, if a proxy adds a "Expect: 100-continue" field when it forwards
    16841405         a request, then it need not forward the corresponding 100 (Continue) response(s).)
    16851406      </p>
    1686       <div id="rfc.iref.22"></div>
     1407      <div id="rfc.iref.4"></div>
     1408      <div id="rfc.iref.s.1"></div>
     1409      <h4 id="rfc.section.4.3.1.1"><a href="#rfc.section.4.3.1.1">4.3.1.1</a>&nbsp;<a id="status.100" href="#status.100">100 Continue</a></h4>
     1410      <p id="rfc.section.4.3.1.1.p.1">The client <em class="bcp14">SHOULD</em> continue with its request. This interim response is used to inform the client that the initial part of the request has been
     1411         received and has not yet been rejected by the server. The client <em class="bcp14">SHOULD</em> continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The
     1412         server <em class="bcp14">MUST</em> send a final response after the request has been completed. See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 6.4.3</a> of <a href="#Part1" id="rfc.xref.Part1.26"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for detailed discussion of the use and handling of this status code.
     1413      </p>
     1414      <div id="rfc.iref.5"></div>
    16871415      <div id="rfc.iref.s.2"></div>
    1688       <h3 id="rfc.section.7.1.1"><a href="#rfc.section.7.1.1">7.1.1</a>&nbsp;<a id="status.100" href="#status.100">100 Continue</a></h3>
    1689       <p id="rfc.section.7.1.1.p.1">The client <em class="bcp14">SHOULD</em> continue with its request. This interim response is used to inform the client that the initial part of the request has been
    1690          received and has not yet been rejected by the server. The client <em class="bcp14">SHOULD</em> continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The
    1691          server <em class="bcp14">MUST</em> send a final response after the request has been completed. See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 6.4.3</a> of <a href="#Part1" id="rfc.xref.Part1.32"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for detailed discussion of the use and handling of this status code.
    1692       </p>
    1693       <div id="rfc.iref.23"></div>
    1694       <div id="rfc.iref.s.3"></div>
    1695       <h3 id="rfc.section.7.1.2"><a href="#rfc.section.7.1.2">7.1.2</a>&nbsp;<a id="status.101" href="#status.101">101 Switching Protocols</a></h3>
    1696       <p id="rfc.section.7.1.2.p.1">The server understands and is willing to comply with the client's request, via the Upgrade message header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.33"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>), for a change in the application protocol being used on this connection. The server will switch protocols to those defined
     1416      <h4 id="rfc.section.4.3.1.2"><a href="#rfc.section.4.3.1.2">4.3.1.2</a>&nbsp;<a id="status.101" href="#status.101">101 Switching Protocols</a></h4>
     1417      <p id="rfc.section.4.3.1.2.p.1">The server understands and is willing to comply with the client's request, via the Upgrade message header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.27"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>), for a change in the application protocol being used on this connection. The server will switch protocols to those defined
    16971418         by the response's Upgrade header field immediately after the empty line which terminates the 101 response.
    16981419      </p>
    1699       <p id="rfc.section.7.1.2.p.2">The protocol <em class="bcp14">SHOULD</em> be switched only when it is advantageous to do so. For example, switching to a newer version of HTTP is advantageous over
     1420      <p id="rfc.section.4.3.1.2.p.2">The protocol <em class="bcp14">SHOULD</em> be switched only when it is advantageous to do so. For example, switching to a newer version of HTTP is advantageous over
    17001421         older versions, and switching to a real-time, synchronous protocol might be advantageous when delivering resources that use
    17011422         such features.
    17021423      </p>
    1703       <h2 id="rfc.section.7.2"><a href="#rfc.section.7.2">7.2</a>&nbsp;<a id="status.2xx" href="#status.2xx">Successful 2xx</a></h2>
    1704       <p id="rfc.section.7.2.p.1">This class of status code indicates that the client's request was successfully received, understood, and accepted.</p>
    1705       <div id="rfc.iref.24"></div>
    1706       <div id="rfc.iref.s.4"></div>
    1707       <h3 id="rfc.section.7.2.1"><a href="#rfc.section.7.2.1">7.2.1</a>&nbsp;<a id="status.200" href="#status.200">200 OK</a></h3>
    1708       <p id="rfc.section.7.2.1.p.1">The request has succeeded. The payload returned with the response is dependent on the method used in the request, for example: </p>
     1424      <h3 id="rfc.section.4.3.2"><a href="#rfc.section.4.3.2">4.3.2</a>&nbsp;<a id="status.2xx" href="#status.2xx">Successful 2xx</a></h3>
     1425      <p id="rfc.section.4.3.2.p.1">This class of status code indicates that the client's request was successfully received, understood, and accepted.</p>
     1426      <div id="rfc.iref.6"></div>
     1427      <div id="rfc.iref.s.3"></div>
     1428      <h4 id="rfc.section.4.3.2.1"><a href="#rfc.section.4.3.2.1">4.3.2.1</a>&nbsp;<a id="status.200" href="#status.200">200 OK</a></h4>
     1429      <p id="rfc.section.4.3.2.1.p.1">The request has succeeded. The payload returned with the response is dependent on the method used in the request, for example: </p>
    17091430      <dl>
    17101431         <dt>GET</dt>
     
    17171438         <dd>a representation containing the request message as received by the end server.</dd>
    17181439      </dl>
    1719       <p id="rfc.section.7.2.1.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.11"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 200 responses.
    1720       </p>
    1721       <div id="rfc.iref.25"></div>
    1722       <div id="rfc.iref.s.5"></div>
    1723       <h3 id="rfc.section.7.2.2"><a href="#rfc.section.7.2.2">7.2.2</a>&nbsp;<a id="status.201" href="#status.201">201 Created</a></h3>
    1724       <p id="rfc.section.7.2.2.p.1">The request has been fulfilled and has resulted in a new resource being created.</p>
    1725       <p id="rfc.section.7.2.2.p.2">The newly created resource is typically linked to from the response payload, with the most relevant URI also being carried
     1440      <p id="rfc.section.4.3.2.1.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 200 responses.
     1441      </p>
     1442      <div id="rfc.iref.7"></div>
     1443      <div id="rfc.iref.s.4"></div>
     1444      <h4 id="rfc.section.4.3.2.2"><a href="#rfc.section.4.3.2.2">4.3.2.2</a>&nbsp;<a id="status.201" href="#status.201">201 Created</a></h4>
     1445      <p id="rfc.section.4.3.2.2.p.1">The request has been fulfilled and has resulted in a new resource being created.</p>
     1446      <p id="rfc.section.4.3.2.2.p.2">The newly created resource is typically linked to from the response payload, with the most relevant URI also being carried
    17261447         in the Location header field. If the newly created resource's URI is the same as the Effective Request URI, this information
    17271448         can be omitted (e.g., in the case of a response to a PUT request).
    17281449      </p>
    1729       <p id="rfc.section.7.2.2.p.3">The origin server <em class="bcp14">MUST</em> create the resource before returning the 201 status code. If the action cannot be carried out immediately, the server <em class="bcp14">SHOULD</em> respond with 202 (Accepted) response instead.
    1730       </p>
    1731       <p id="rfc.section.7.2.2.p.4">A 201 response <em class="bcp14">MAY</em> contain an ETag response header field indicating the current value of the entity-tag for the representation of the resource
     1450      <p id="rfc.section.4.3.2.2.p.3">The origin server <em class="bcp14">MUST</em> create the resource before returning the 201 status code. If the action cannot be carried out immediately, the server <em class="bcp14">SHOULD</em> respond with 202 (Accepted) response instead.
     1451      </p>
     1452      <p id="rfc.section.4.3.2.2.p.4">A 201 response <em class="bcp14">MAY</em> contain an ETag response header field indicating the current value of the entity-tag for the representation of the resource
    17321453         just created (see <a href="p4-conditional.html#header.etag" title="ETag">Section 2.3</a> of <a href="#Part4" id="rfc.xref.Part4.9"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>).
    17331454      </p>
    1734       <div id="rfc.iref.26"></div>
    1735       <div id="rfc.iref.s.6"></div>
    1736       <h3 id="rfc.section.7.2.3"><a href="#rfc.section.7.2.3">7.2.3</a>&nbsp;<a id="status.202" href="#status.202">202 Accepted</a></h3>
    1737       <p id="rfc.section.7.2.3.p.1">The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually
     1455      <div id="rfc.iref.8"></div>
     1456      <div id="rfc.iref.s.5"></div>
     1457      <h4 id="rfc.section.4.3.2.3"><a href="#rfc.section.4.3.2.3">4.3.2.3</a>&nbsp;<a id="status.202" href="#status.202">202 Accepted</a></h4>
     1458      <p id="rfc.section.4.3.2.3.p.1">The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually
    17381459         be acted upon, as it might be disallowed when processing actually takes place. There is no facility for re-sending a status
    17391460         code from an asynchronous operation such as this.
    17401461      </p>
    1741       <p id="rfc.section.7.2.3.p.2">The 202 response is intentionally non-committal. Its purpose is to allow a server to accept a request for some other process
     1462      <p id="rfc.section.4.3.2.3.p.2">The 202 response is intentionally non-committal. Its purpose is to allow a server to accept a request for some other process
    17421463         (perhaps a batch-oriented process that is only run once per day) without requiring that the user agent's connection to the
    17431464         server persist until the process is completed. The representation returned with this response <em class="bcp14">SHOULD</em> include an indication of the request's current status and either a pointer to a status monitor or some estimate of when the
    17441465         user can expect the request to be fulfilled.
    17451466      </p>
    1746       <div id="rfc.iref.27"></div>
     1467      <div id="rfc.iref.9"></div>
     1468      <div id="rfc.iref.s.6"></div>
     1469      <h4 id="rfc.section.4.3.2.4"><a href="#rfc.section.4.3.2.4">4.3.2.4</a>&nbsp;<a id="status.203" href="#status.203">203 Non-Authoritative Information</a></h4>
     1470      <p id="rfc.section.4.3.2.4.p.1">The representation in the response has been transformed or otherwise modified by a transforming proxy (<a href="p1-messaging.html#intermediaries" title="Intermediaries">Section 2.3</a> of <a href="#Part1" id="rfc.xref.Part1.28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Note that the behavior of transforming intermediaries is controlled by the no-transform Cache-Control directive (<a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 3.2</a> of <a href="#Part6" id="rfc.xref.Part6.7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     1471      </p>
     1472      <p id="rfc.section.4.3.2.4.p.2">This status code is only appropriate when the response status code would have been 200 (OK) otherwise. When the status code
     1473         before transformation would have been different, the 214 Transformation Applied warn-code (<a href="p6-cache.html#header.warning" title="Warning">Section 3.6</a> of <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) is appropriate.
     1474      </p>
     1475      <p id="rfc.section.4.3.2.4.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 203 responses.
     1476      </p>
     1477      <div id="rfc.iref.10"></div>
    17471478      <div id="rfc.iref.s.7"></div>
    1748       <h3 id="rfc.section.7.2.4"><a href="#rfc.section.7.2.4">7.2.4</a>&nbsp;<a id="status.203" href="#status.203">203 Non-Authoritative Information</a></h3>
    1749       <p id="rfc.section.7.2.4.p.1">The representation in the response has been transformed or otherwise modified by a transforming proxy (<a href="p1-messaging.html#intermediaries" title="Intermediaries">Section 2.3</a> of <a href="#Part1" id="rfc.xref.Part1.34"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Note that the behavior of transforming intermediaries is controlled by the no-transform Cache-Control directive (<a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 3.2</a> of <a href="#Part6" id="rfc.xref.Part6.12"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    1750       </p>
    1751       <p id="rfc.section.7.2.4.p.2">This status code is only appropriate when the response status code would have been 200 (OK) otherwise. When the status code
    1752          before transformation would have been different, the 214 Transformation Applied warn-code (<a href="p6-cache.html#header.warning" title="Warning">Section 3.6</a> of <a href="#Part6" id="rfc.xref.Part6.13"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) is appropriate.
    1753       </p>
    1754       <p id="rfc.section.7.2.4.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.14"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 203 responses.
    1755       </p>
    1756       <div id="rfc.iref.28"></div>
    1757       <div id="rfc.iref.s.8"></div>
    1758       <h3 id="rfc.section.7.2.5"><a href="#rfc.section.7.2.5">7.2.5</a>&nbsp;<a id="status.204" href="#status.204">204 No Content</a></h3>
    1759       <p id="rfc.section.7.2.5.p.1">The 204 (No Content) status code indicates that the server has successfully fulfilled the request and that there is no additional
     1479      <h4 id="rfc.section.4.3.2.5"><a href="#rfc.section.4.3.2.5">4.3.2.5</a>&nbsp;<a id="status.204" href="#status.204">204 No Content</a></h4>
     1480      <p id="rfc.section.4.3.2.5.p.1">The 204 (No Content) status code indicates that the server has successfully fulfilled the request and that there is no additional
    17601481         content to return in the response payload body. Metadata in the response header fields refer to the target resource and its
    17611482         current representation after the requested action.
    17621483      </p>
    1763       <p id="rfc.section.7.2.5.p.2">For example, if a 204 status code is received in response to a PUT request and the response contains an ETag header field,
     1484      <p id="rfc.section.4.3.2.5.p.2">For example, if a 204 status code is received in response to a PUT request and the response contains an ETag header field,
    17641485         then the PUT was successful and the ETag field-value contains the entity-tag for the new representation of that target resource.
    17651486      </p>
    1766       <p id="rfc.section.7.2.5.p.3">The 204 response allows a server to indicate that the action has been successfully applied to the target resource while implying
     1487      <p id="rfc.section.4.3.2.5.p.3">The 204 response allows a server to indicate that the action has been successfully applied to the target resource while implying
    17671488         that the user agent <em class="bcp14">SHOULD NOT</em> traverse away from its current "document view" (if any). The server assumes that the user agent will provide some indication
    17681489         of the success to its user, in accord with its own interface, and apply any new or updated metadata in the response to the
    17691490         active representation.
    17701491      </p>
    1771       <p id="rfc.section.7.2.5.p.4">For example, a 204 status code is commonly used with document editing interfaces corresponding to a "save" action, such that
     1492      <p id="rfc.section.4.3.2.5.p.4">For example, a 204 status code is commonly used with document editing interfaces corresponding to a "save" action, such that
    17721493         the document being saved remains available to the user for editing. It is also frequently used with interfaces that expect
    17731494         automated data transfers to be prevalent, such as within distributed version control systems.
    17741495      </p>
    1775       <p id="rfc.section.7.2.5.p.5">The 204 response <em class="bcp14">MUST NOT</em> include a message body, and thus is always terminated by the first empty line after the header fields.
    1776       </p>
    1777       <div id="rfc.iref.29"></div>
    1778       <div id="rfc.iref.s.9"></div>
    1779       <h3 id="rfc.section.7.2.6"><a href="#rfc.section.7.2.6">7.2.6</a>&nbsp;<a id="status.205" href="#status.205">205 Reset Content</a></h3>
    1780       <p id="rfc.section.7.2.6.p.1">The server has fulfilled the request and the user agent <em class="bcp14">SHOULD</em> reset the document view which caused the request to be sent. This response is primarily intended to allow input for actions
     1496      <p id="rfc.section.4.3.2.5.p.5">The 204 response <em class="bcp14">MUST NOT</em> include a message body, and thus is always terminated by the first empty line after the header fields.
     1497      </p>
     1498      <div id="rfc.iref.11"></div>
     1499      <div id="rfc.iref.s.8"></div>
     1500      <h4 id="rfc.section.4.3.2.6"><a href="#rfc.section.4.3.2.6">4.3.2.6</a>&nbsp;<a id="status.205" href="#status.205">205 Reset Content</a></h4>
     1501      <p id="rfc.section.4.3.2.6.p.1">The server has fulfilled the request and the user agent <em class="bcp14">SHOULD</em> reset the document view which caused the request to be sent. This response is primarily intended to allow input for actions
    17811502         to take place via user input, followed by a clearing of the form in which the input is given so that the user can easily initiate
    17821503         another input action.
    17831504      </p>
    1784       <p id="rfc.section.7.2.6.p.2">The message body included with the response <em class="bcp14">MUST</em> be empty. Note that receivers still need to parse the response according to the algorithm defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.35"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
    1785       </p>
    1786       <h2 id="rfc.section.7.3"><a href="#rfc.section.7.3">7.3</a>&nbsp;<a id="status.3xx" href="#status.3xx">Redirection 3xx</a></h2>
    1787       <p id="rfc.section.7.3.p.1">This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request.
     1505      <p id="rfc.section.4.3.2.6.p.2">The message body included with the response <em class="bcp14">MUST</em> be empty. Note that receivers still need to parse the response according to the algorithm defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     1506      </p>
     1507      <h3 id="rfc.section.4.3.3"><a href="#rfc.section.4.3.3">4.3.3</a>&nbsp;<a id="status.3xx" href="#status.3xx">Redirection 3xx</a></h3>
     1508      <p id="rfc.section.4.3.3.p.1">This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request.
    17881509         If the required action involves a subsequent HTTP request, it <em class="bcp14">MAY</em> be carried out by the user agent without interaction with the user if and only if the method used in the second request is
    17891510         known to be "safe", as defined in <a href="#safe.methods" title="Safe Methods">Section&nbsp;6.1.1</a>.
    17901511      </p>
    1791       <p id="rfc.section.7.3.p.2">There are several types of redirects: </p>
     1512      <p id="rfc.section.4.3.3.p.2">There are several types of redirects: </p>
    17921513      <ol>
    17931514         <li>
     
    18031524         </li>
    18041525         <li>
    1805             <p>Redirection offering a choice of matching resources for use by agent-driven content negotiation (<a href="p3-payload.html#agent-driven.negotiation" title="Agent-driven Negotiation">Section 5.2</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>). This is status code 300 (Multiple Choices).
     1526            <p>Redirection offering a choice of matching resources for use by agent-driven content negotiation (<a href="p3-payload.html#agent-driven.negotiation" title="Agent-driven Negotiation">Section 5.2</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>). This is status code 300 (Multiple Choices).
    18061527            </p>
    18071528         </li>
     
    18111532         </li>
    18121533      </ol>
    1813       <div class="note" id="rfc.section.7.3.p.3">
     1534      <div class="note" id="rfc.section.4.3.3.p.3">
    18141535         <p> <b>Note:</b> In HTTP/1.0, only the status codes 301 (Moved Permanently) and 302 (Found) were defined for the first type of redirect, and
    18151536            the second type did not exist at all (<a href="#RFC1945" id="rfc.xref.RFC1945.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.0">[RFC1945]</cite></a>, <a href="http://tools.ietf.org/html/rfc1945#section-9.3">Section 9.3</a>). However it turned out that web forms using POST expected redirects to change the operation for the subsequent request to
     
    18201541         </p>
    18211542      </div>
    1822       <p id="rfc.section.7.3.p.4">A Location header field on a 3xx response indicates that a client <em class="bcp14">MAY</em> automatically redirect to the URI provided; see <a href="#header.location" id="rfc.xref.header.location.3" title="Location">Section&nbsp;9.5</a>.
    1823       </p>
    1824       <p id="rfc.section.7.3.p.5">Note that for methods not known to be "safe", as defined in <a href="#safe.methods" title="Safe Methods">Section&nbsp;6.1.1</a>, automatic redirection needs to done with care, since the redirect might change the conditions under which the request was
     1543      <p id="rfc.section.4.3.3.p.4">A Location header field on a 3xx response indicates that a client <em class="bcp14">MAY</em> automatically redirect to the URI provided; see <a href="#header.location" id="rfc.xref.header.location.2" title="Location">Section&nbsp;8.5</a>.
     1544      </p>
     1545      <p id="rfc.section.4.3.3.p.5">Note that for methods not known to be "safe", as defined in <a href="#safe.methods" title="Safe Methods">Section&nbsp;6.1.1</a>, automatic redirection needs to done with care, since the redirect might change the conditions under which the request was
    18251546         issued.
    18261547      </p>
    1827       <p id="rfc.section.7.3.p.6">Clients <em class="bcp14">SHOULD</em> detect and intervene in cyclical redirections (i.e., "infinite" redirection loops).
    1828       </p>
    1829       <div class="note" id="rfc.section.7.3.p.7">
     1548      <p id="rfc.section.4.3.3.p.6">Clients <em class="bcp14">SHOULD</em> detect and intervene in cyclical redirections (i.e., "infinite" redirection loops).
     1549      </p>
     1550      <div class="note" id="rfc.section.4.3.3.p.7">
    18301551         <p> <b>Note:</b> An earlier version of this specification recommended a maximum of five redirections (<a href="#RFC2068" id="rfc.xref.RFC2068.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>, <a href="http://tools.ietf.org/html/rfc2068#section-10.3">Section 10.3</a>). Content developers need to be aware that some clients might implement such a fixed limitation.
    18311552         </p>
    18321553      </div>
    1833       <div id="rfc.iref.30"></div>
    1834       <div id="rfc.iref.s.10"></div>
    1835       <h3 id="rfc.section.7.3.1"><a href="#rfc.section.7.3.1">7.3.1</a>&nbsp;<a id="status.300" href="#status.300">300 Multiple Choices</a></h3>
    1836       <p id="rfc.section.7.3.1.p.1">The target resource has more than one representation, each with its own specific location, and agent-driven negotiation information
    1837          (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.11"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to that
     1554      <div id="rfc.iref.12"></div>
     1555      <div id="rfc.iref.s.9"></div>
     1556      <h4 id="rfc.section.4.3.3.1"><a href="#rfc.section.4.3.3.1">4.3.3.1</a>&nbsp;<a id="status.300" href="#status.300">300 Multiple Choices</a></h4>
     1557      <p id="rfc.section.4.3.3.1.p.1">The target resource has more than one representation, each with its own specific location, and agent-driven negotiation information
     1558         (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to that
    18381559         location.
    18391560      </p>
    1840       <p id="rfc.section.7.3.1.p.2">Unless it was a HEAD request, the response <em class="bcp14">SHOULD</em> include a representation containing a list of representation metadata and location(s) from which the user or user agent can
     1561      <p id="rfc.section.4.3.3.1.p.2">Unless it was a HEAD request, the response <em class="bcp14">SHOULD</em> include a representation containing a list of representation metadata and location(s) from which the user or user agent can
    18411562         choose the one most appropriate. Depending upon the format and the capabilities of the user agent, selection of the most appropriate
    18421563         choice <em class="bcp14">MAY</em> be performed automatically. However, this specification does not define any standard for such automatic selection.
    18431564      </p>
    1844       <p id="rfc.section.7.3.1.p.3">If the server has a preferred choice of representation, it <em class="bcp14">SHOULD</em> include the specific URI for that representation in the Location field; user agents <em class="bcp14">MAY</em> use the Location field value for automatic redirection.
    1845       </p>
    1846       <p id="rfc.section.7.3.1.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.15"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 300 responses.
    1847       </p>
    1848       <div id="rfc.iref.31"></div>
    1849       <div id="rfc.iref.s.11"></div>
    1850       <h3 id="rfc.section.7.3.2"><a href="#rfc.section.7.3.2">7.3.2</a>&nbsp;<a id="status.301" href="#status.301">301 Moved Permanently</a></h3>
    1851       <p id="rfc.section.7.3.2.p.1">The target resource has been assigned a new permanent URI and any future references to this resource <em class="bcp14">SHOULD</em> use one of the returned URIs. Clients with link editing capabilities ought to automatically re-link references to the effective
     1565      <p id="rfc.section.4.3.3.1.p.3">If the server has a preferred choice of representation, it <em class="bcp14">SHOULD</em> include the specific URI for that representation in the Location field; user agents <em class="bcp14">MAY</em> use the Location field value for automatic redirection.
     1566      </p>
     1567      <p id="rfc.section.4.3.3.1.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.10"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 300 responses.
     1568      </p>
     1569      <div id="rfc.iref.13"></div>
     1570      <div id="rfc.iref.s.10"></div>
     1571      <h4 id="rfc.section.4.3.3.2"><a href="#rfc.section.4.3.3.2">4.3.3.2</a>&nbsp;<a id="status.301" href="#status.301">301 Moved Permanently</a></h4>
     1572      <p id="rfc.section.4.3.3.2.p.1">The target resource has been assigned a new permanent URI and any future references to this resource <em class="bcp14">SHOULD</em> use one of the returned URIs. Clients with link editing capabilities ought to automatically re-link references to the effective
    18521573         request URI to one or more of the new references returned by the server, where possible.
    18531574      </p>
    1854       <p id="rfc.section.7.3.2.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.16"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 301 responses.
    1855       </p>
    1856       <p id="rfc.section.7.3.2.p.3">The new permanent URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
     1575      <p id="rfc.section.4.3.3.2.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.11"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 301 responses.
     1576      </p>
     1577      <p id="rfc.section.4.3.3.2.p.3">The new permanent URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
    18571578         the new URI(s).
    18581579      </p>
    1859       <div class="note" id="rfc.section.7.3.2.p.4">
     1580      <div class="note" id="rfc.section.4.3.3.2.p.4">
    18601581         <p> <b>Note:</b> For historic reasons, user agents <em class="bcp14">MAY</em> change the request method from POST to GET for the subsequent request. If this behavior is undesired, status code 307 (Temporary
    18611582            Redirect) can be used instead.
    18621583         </p>
    18631584      </div>
    1864       <div id="rfc.iref.32"></div>
    1865       <div id="rfc.iref.s.12"></div>
    1866       <h3 id="rfc.section.7.3.3"><a href="#rfc.section.7.3.3">7.3.3</a>&nbsp;<a id="status.302" href="#status.302">302 Found</a></h3>
    1867       <p id="rfc.section.7.3.3.p.1">The target resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client <em class="bcp14">SHOULD</em> continue to use the effective request URI for future requests.
    1868       </p>
    1869       <p id="rfc.section.7.3.3.p.2">The temporary URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
     1585      <div id="rfc.iref.14"></div>
     1586      <div id="rfc.iref.s.11"></div>
     1587      <h4 id="rfc.section.4.3.3.3"><a href="#rfc.section.4.3.3.3">4.3.3.3</a>&nbsp;<a id="status.302" href="#status.302">302 Found</a></h4>
     1588      <p id="rfc.section.4.3.3.3.p.1">The target resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client <em class="bcp14">SHOULD</em> continue to use the effective request URI for future requests.
     1589      </p>
     1590      <p id="rfc.section.4.3.3.3.p.2">The temporary URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
    18701591         the new URI(s).
    18711592      </p>
    1872       <div class="note" id="rfc.section.7.3.3.p.3">
     1593      <div class="note" id="rfc.section.4.3.3.3.p.3">
    18731594         <p> <b>Note:</b> For historic reasons, user agents <em class="bcp14">MAY</em> change the request method from POST to GET for the subsequent request. If this behavior is undesired, status code 307 (Temporary
    18741595            Redirect) can be used instead.
    18751596         </p>
    18761597      </div>
    1877       <div id="rfc.iref.33"></div>
    1878       <div id="rfc.iref.s.13"></div>
    1879       <h3 id="rfc.section.7.3.4"><a href="#rfc.section.7.3.4">7.3.4</a>&nbsp;<a id="status.303" href="#status.303">303 See Other</a></h3>
    1880       <p id="rfc.section.7.3.4.p.1">The 303 status code indicates that the server is redirecting the user agent to a different resource, as indicated by a URI
     1598      <div id="rfc.iref.15"></div>
     1599      <div id="rfc.iref.s.12"></div>
     1600      <h4 id="rfc.section.4.3.3.4"><a href="#rfc.section.4.3.3.4">4.3.3.4</a>&nbsp;<a id="status.303" href="#status.303">303 See Other</a></h4>
     1601      <p id="rfc.section.4.3.3.4.p.1">The 303 status code indicates that the server is redirecting the user agent to a different resource, as indicated by a URI
    18811602         in the Location header field, that is intended to provide an indirect response to the original request. In order to satisfy
    18821603         the original request, a user agent <em class="bcp14">SHOULD</em> perform a retrieval request using the Location URI (a GET or HEAD request if using HTTP), which may itself be redirected further,
     
    18841605         not considered equivalent to the effective request URI.
    18851606      </p>
    1886       <p id="rfc.section.7.3.4.p.2">This status code is generally applicable to any HTTP method. It is primarily used to allow the output of a POST action to
     1607      <p id="rfc.section.4.3.3.4.p.2">This status code is generally applicable to any HTTP method. It is primarily used to allow the output of a POST action to
    18871608         redirect the user agent to a selected resource, since doing so provides the information corresponding to the POST response
    18881609         in a form that can be separately identified, bookmarked, and cached independent of the original request.
    18891610      </p>
    1890       <p id="rfc.section.7.3.4.p.3">A 303 response to a GET request indicates that the requested resource does not have a representation of its own that can be
     1611      <p id="rfc.section.4.3.3.4.p.3">A 303 response to a GET request indicates that the requested resource does not have a representation of its own that can be
    18911612         transferred by the server over HTTP. The Location URI indicates a resource that is descriptive of the target resource, such
    18921613         that the follow-on representation might be useful to recipients without implying that it adequately represents the target
     
    18941615         be a useful description are outside the scope of HTTP and thus entirely determined by the URI owner(s).
    18951616      </p>
    1896       <p id="rfc.section.7.3.4.p.4">Except for responses to a HEAD request, the representation of a 303 response <em class="bcp14">SHOULD</em> contain a short hypertext note with a hyperlink to the Location URI.
    1897       </p>
    1898       <div id="rfc.iref.34"></div>
     1617      <p id="rfc.section.4.3.3.4.p.4">Except for responses to a HEAD request, the representation of a 303 response <em class="bcp14">SHOULD</em> contain a short hypertext note with a hyperlink to the Location URI.
     1618      </p>
     1619      <div id="rfc.iref.16"></div>
     1620      <div id="rfc.iref.s.13"></div>
     1621      <h4 id="rfc.section.4.3.3.5"><a href="#rfc.section.4.3.3.5">4.3.3.5</a>&nbsp;<a id="status.305" href="#status.305">305 Use Proxy</a></h4>
     1622      <p id="rfc.section.4.3.3.5.p.1">The 305 status code was defined in a previous version of this specification (see <a href="#changes.from.rfc.2616" title="Changes from RFC 2616">Appendix&nbsp;A</a>), and is now deprecated.
     1623      </p>
     1624      <div id="rfc.iref.17"></div>
    18991625      <div id="rfc.iref.s.14"></div>
    1900       <h3 id="rfc.section.7.3.5"><a href="#rfc.section.7.3.5">7.3.5</a>&nbsp;<a id="status.305" href="#status.305">305 Use Proxy</a></h3>
    1901       <p id="rfc.section.7.3.5.p.1">The 305 status code was defined in a previous version of this specification (see <a href="#changes.from.rfc.2616" title="Changes from RFC 2616">Appendix&nbsp;A</a>), and is now deprecated.
    1902       </p>
    1903       <div id="rfc.iref.35"></div>
     1626      <h4 id="rfc.section.4.3.3.6"><a href="#rfc.section.4.3.3.6">4.3.3.6</a>&nbsp;<a id="status.306" href="#status.306">306 (Unused)</a></h4>
     1627      <p id="rfc.section.4.3.3.6.p.1">The 306 status code was used in a previous version of the specification, is no longer used, and the code is reserved.</p>
     1628      <div id="rfc.iref.18"></div>
    19041629      <div id="rfc.iref.s.15"></div>
    1905       <h3 id="rfc.section.7.3.6"><a href="#rfc.section.7.3.6">7.3.6</a>&nbsp;<a id="status.306" href="#status.306">306 (Unused)</a></h3>
    1906       <p id="rfc.section.7.3.6.p.1">The 306 status code was used in a previous version of the specification, is no longer used, and the code is reserved.</p>
    1907       <div id="rfc.iref.36"></div>
    1908       <div id="rfc.iref.s.16"></div>
    1909       <h3 id="rfc.section.7.3.7"><a href="#rfc.section.7.3.7">7.3.7</a>&nbsp;<a id="status.307" href="#status.307">307 Temporary Redirect</a></h3>
    1910       <p id="rfc.section.7.3.7.p.1">The target resource resides temporarily under a different URI. Since the redirection can change over time, the client <em class="bcp14">SHOULD</em> continue to use the effective request URI for future requests.
    1911       </p>
    1912       <p id="rfc.section.7.3.7.p.2">The temporary URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
     1630      <h4 id="rfc.section.4.3.3.7"><a href="#rfc.section.4.3.3.7">4.3.3.7</a>&nbsp;<a id="status.307" href="#status.307">307 Temporary Redirect</a></h4>
     1631      <p id="rfc.section.4.3.3.7.p.1">The target resource resides temporarily under a different URI. Since the redirection can change over time, the client <em class="bcp14">SHOULD</em> continue to use the effective request URI for future requests.
     1632      </p>
     1633      <p id="rfc.section.4.3.3.7.p.2">The temporary URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. A response payload can contain a short hypertext note with a hyperlink to
    19131634         the new URI(s).
    19141635      </p>
    1915       <div class="note" id="rfc.section.7.3.7.p.3">
     1636      <div class="note" id="rfc.section.4.3.3.7.p.3">
    19161637         <p> <b>Note:</b> This status code is similar to 302 Found, except that it does not allow rewriting the request method from POST to GET. This
    19171638            specification defines no equivalent counterpart for 301 Moved Permanently (<a href="#draft-reschke-http-status-308" id="rfc.xref.draft-reschke-http-status-308.1"><cite title="The Hypertext Transfer Protocol (HTTP) Status Code 308 (Permanent Redirect)">[draft-reschke-http-status-308]</cite></a>, however, defines the status code 308 Permanent Redirect for this purpose).
    19181639         </p>
    19191640      </div>
    1920       <h2 id="rfc.section.7.4"><a href="#rfc.section.7.4">7.4</a>&nbsp;<a id="status.4xx" href="#status.4xx">Client Error 4xx</a></h2>
    1921       <p id="rfc.section.7.4.p.1">The 4xx class of status code is intended for cases in which the client seems to have erred. Except when responding to a HEAD
     1641      <h3 id="rfc.section.4.3.4"><a href="#rfc.section.4.3.4">4.3.4</a>&nbsp;<a id="status.4xx" href="#status.4xx">Client Error 4xx</a></h3>
     1642      <p id="rfc.section.4.3.4.p.1">The 4xx class of status code is intended for cases in which the client seems to have erred. Except when responding to a HEAD
    19221643         request, the server <em class="bcp14">SHOULD</em> include a representation containing an explanation of the error situation, and whether it is a temporary or permanent condition.
    19231644         These status codes are applicable to any request method. User agents <em class="bcp14">SHOULD</em> display any included representation to the user.
    19241645      </p>
    1925       <div id="rfc.iref.37"></div>
     1646      <div id="rfc.iref.19"></div>
     1647      <div id="rfc.iref.s.16"></div>
     1648      <h4 id="rfc.section.4.3.4.1"><a href="#rfc.section.4.3.4.1">4.3.4.1</a>&nbsp;<a id="status.400" href="#status.400">400 Bad Request</a></h4>
     1649      <p id="rfc.section.4.3.4.1.p.1">The server cannot or will not process the request, due to a client error (e.g., malformed syntax).</p>
     1650      <div id="rfc.iref.20"></div>
    19261651      <div id="rfc.iref.s.17"></div>
    1927       <h3 id="rfc.section.7.4.1"><a href="#rfc.section.7.4.1">7.4.1</a>&nbsp;<a id="status.400" href="#status.400">400 Bad Request</a></h3>
    1928       <p id="rfc.section.7.4.1.p.1">The server cannot or will not process the request, due to a client error (e.g., malformed syntax).</p>
    1929       <div id="rfc.iref.38"></div>
     1652      <h4 id="rfc.section.4.3.4.2"><a href="#rfc.section.4.3.4.2">4.3.4.2</a>&nbsp;<a id="status.402" href="#status.402">402 Payment Required</a></h4>
     1653      <p id="rfc.section.4.3.4.2.p.1">This code is reserved for future use.</p>
     1654      <div id="rfc.iref.21"></div>
    19301655      <div id="rfc.iref.s.18"></div>
    1931       <h3 id="rfc.section.7.4.2"><a href="#rfc.section.7.4.2">7.4.2</a>&nbsp;<a id="status.402" href="#status.402">402 Payment Required</a></h3>
    1932       <p id="rfc.section.7.4.2.p.1">This code is reserved for future use.</p>
    1933       <div id="rfc.iref.39"></div>
     1656      <h4 id="rfc.section.4.3.4.3"><a href="#rfc.section.4.3.4.3">4.3.4.3</a>&nbsp;<a id="status.403" href="#status.403">403 Forbidden</a></h4>
     1657      <p id="rfc.section.4.3.4.3.p.1">The server understood the request, but refuses to authorize it. Providing different user authentication credentials might
     1658         be successful, but any credentials that were provided in the request are insufficient. The request <em class="bcp14">SHOULD NOT</em> be repeated with the same credentials.
     1659      </p>
     1660      <p id="rfc.section.4.3.4.3.p.2">If the request method was not HEAD and the server wishes to make public why the request has not been fulfilled, it <em class="bcp14">SHOULD</em> describe the reason for the refusal in the representation. If the server does not wish to make this information available
     1661         to the client, the status code 404 (Not Found) <em class="bcp14">MAY</em> be used instead.
     1662      </p>
     1663      <div id="rfc.iref.22"></div>
    19341664      <div id="rfc.iref.s.19"></div>
    1935       <h3 id="rfc.section.7.4.3"><a href="#rfc.section.7.4.3">7.4.3</a>&nbsp;<a id="status.403" href="#status.403">403 Forbidden</a></h3>
    1936       <p id="rfc.section.7.4.3.p.1">The server understood the request, but refuses to authorize it. Providing different user authentication credentials might
    1937          be successful, but any credentials that were provided in the request are insufficient. The request <em class="bcp14">SHOULD NOT</em> be repeated with the same credentials.
    1938       </p>
    1939       <p id="rfc.section.7.4.3.p.2">If the request method was not HEAD and the server wishes to make public why the request has not been fulfilled, it <em class="bcp14">SHOULD</em> describe the reason for the refusal in the representation. If the server does not wish to make this information available
    1940          to the client, the status code 404 (Not Found) <em class="bcp14">MAY</em> be used instead.
    1941       </p>
    1942       <div id="rfc.iref.40"></div>
    1943       <div id="rfc.iref.s.20"></div>
    1944       <h3 id="rfc.section.7.4.4"><a href="#rfc.section.7.4.4">7.4.4</a>&nbsp;<a id="status.404" href="#status.404">404 Not Found</a></h3>
    1945       <p id="rfc.section.7.4.4.p.1">The server has not found anything matching the effective request URI. No indication is given of whether the condition is temporary
     1665      <h4 id="rfc.section.4.3.4.4"><a href="#rfc.section.4.3.4.4">4.3.4.4</a>&nbsp;<a id="status.404" href="#status.404">404 Not Found</a></h4>
     1666      <p id="rfc.section.4.3.4.4.p.1">The server has not found anything matching the effective request URI. No indication is given of whether the condition is temporary
    19461667         or permanent. The 410 (Gone) status code <em class="bcp14">SHOULD</em> be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable
    19471668         and has no forwarding address. This status code is commonly used when the server does not wish to reveal exactly why the request
    19481669         has been refused, or when no other response is applicable.
    19491670      </p>
    1950       <div id="rfc.iref.41"></div>
     1671      <div id="rfc.iref.23"></div>
     1672      <div id="rfc.iref.s.20"></div>
     1673      <h4 id="rfc.section.4.3.4.5"><a href="#rfc.section.4.3.4.5">4.3.4.5</a>&nbsp;<a id="status.405" href="#status.405">405 Method Not Allowed</a></h4>
     1674      <p id="rfc.section.4.3.4.5.p.1">The method specified in the request-line is not allowed for the target resource. The response <em class="bcp14">MUST</em> include an Allow header field containing a list of valid methods for the requested resource.
     1675      </p>
     1676      <div id="rfc.iref.24"></div>
    19511677      <div id="rfc.iref.s.21"></div>
    1952       <h3 id="rfc.section.7.4.5"><a href="#rfc.section.7.4.5">7.4.5</a>&nbsp;<a id="status.405" href="#status.405">405 Method Not Allowed</a></h3>
    1953       <p id="rfc.section.7.4.5.p.1">The method specified in the request-line is not allowed for the target resource. The response <em class="bcp14">MUST</em> include an Allow header field containing a list of valid methods for the requested resource.
    1954       </p>
    1955       <div id="rfc.iref.42"></div>
    1956       <div id="rfc.iref.s.22"></div>
    1957       <h3 id="rfc.section.7.4.6"><a href="#rfc.section.7.4.6">7.4.6</a>&nbsp;<a id="status.406" href="#status.406">406 Not Acceptable</a></h3>
    1958       <p id="rfc.section.7.4.6.p.1">The resource identified by the request is only capable of generating response representations which have content characteristics
    1959          not acceptable according to the Accept and Accept-* header fields sent in the request (see <a href="p3-payload.html#header.field.definitions" title="Header Field Definitions">Section 6</a> of <a href="#Part3" id="rfc.xref.Part3.12"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    1960       </p>
    1961       <p id="rfc.section.7.4.6.p.2">Unless it was a HEAD request, the response <em class="bcp14">SHOULD</em> include a representation containing a list of available representation characteristics and location(s) from which the user
     1678      <h4 id="rfc.section.4.3.4.6"><a href="#rfc.section.4.3.4.6">4.3.4.6</a>&nbsp;<a id="status.406" href="#status.406">406 Not Acceptable</a></h4>
     1679      <p id="rfc.section.4.3.4.6.p.1">The resource identified by the request is only capable of generating response representations which have content characteristics
     1680         not acceptable according to the Accept and Accept-* header fields sent in the request (see <a href="p3-payload.html#header.field.definitions" title="Header Field Definitions">Section 6</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
     1681      </p>
     1682      <p id="rfc.section.4.3.4.6.p.2">Unless it was a HEAD request, the response <em class="bcp14">SHOULD</em> include a representation containing a list of available representation characteristics and location(s) from which the user
    19621683         or user agent can choose the one most appropriate. Depending upon the format and the capabilities of the user agent, selection
    19631684         of the most appropriate choice <em class="bcp14">MAY</em> be performed automatically. However, this specification does not define any standard for such automatic selection.
    19641685      </p>
    1965       <div class="note" id="rfc.section.7.4.6.p.3">
     1686      <div class="note" id="rfc.section.4.3.4.6.p.3">
    19661687         <p> <b>Note:</b> HTTP/1.1 servers are allowed to return responses which are not acceptable according to the accept header fields sent in the
    19671688            request. In some cases, this might even be preferable to sending a 406 response. User agents are encouraged to inspect the
     
    19691690         </p>
    19701691      </div>
    1971       <p id="rfc.section.7.4.6.p.4">If the response could be unacceptable, a user agent <em class="bcp14">SHOULD</em> temporarily stop receipt of more data and query the user for a decision on further actions.
    1972       </p>
    1973       <div id="rfc.iref.43"></div>
     1692      <p id="rfc.section.4.3.4.6.p.4">If the response could be unacceptable, a user agent <em class="bcp14">SHOULD</em> temporarily stop receipt of more data and query the user for a decision on further actions.
     1693      </p>
     1694      <div id="rfc.iref.25"></div>
     1695      <div id="rfc.iref.s.22"></div>
     1696      <h4 id="rfc.section.4.3.4.7"><a href="#rfc.section.4.3.4.7">4.3.4.7</a>&nbsp;<a id="status.408" href="#status.408">408 Request Timeout</a></h4>
     1697      <p id="rfc.section.4.3.4.7.p.1">The client did not produce a request within the time that the server was prepared to wait. The client <em class="bcp14">MAY</em> repeat the request without modifications at any later time.
     1698      </p>
     1699      <div id="rfc.iref.26"></div>
    19741700      <div id="rfc.iref.s.23"></div>
    1975       <h3 id="rfc.section.7.4.7"><a href="#rfc.section.7.4.7">7.4.7</a>&nbsp;<a id="status.408" href="#status.408">408 Request Timeout</a></h3>
    1976       <p id="rfc.section.7.4.7.p.1">The client did not produce a request within the time that the server was prepared to wait. The client <em class="bcp14">MAY</em> repeat the request without modifications at any later time.
    1977       </p>
    1978       <div id="rfc.iref.44"></div>
    1979       <div id="rfc.iref.s.24"></div>
    1980       <h3 id="rfc.section.7.4.8"><a href="#rfc.section.7.4.8">7.4.8</a>&nbsp;<a id="status.409" href="#status.409">409 Conflict</a></h3>
    1981       <p id="rfc.section.7.4.8.p.1">The request could not be completed due to a conflict with the current state of the resource. This code is only allowed in
     1701      <h4 id="rfc.section.4.3.4.8"><a href="#rfc.section.4.3.4.8">4.3.4.8</a>&nbsp;<a id="status.409" href="#status.409">409 Conflict</a></h4>
     1702      <p id="rfc.section.4.3.4.8.p.1">The request could not be completed due to a conflict with the current state of the resource. This code is only allowed in
    19821703         situations where it is expected that the user might be able to resolve the conflict and resubmit the request. The response
    19831704         body <em class="bcp14">SHOULD</em> include enough information for the user to recognize the source of the conflict. Ideally, the response representation would
    19841705         include enough information for the user or user agent to fix the problem; however, that might not be possible and is not required.
    19851706      </p>
    1986       <p id="rfc.section.7.4.8.p.2">Conflicts are most likely to occur in response to a PUT request. For example, if versioning were being used and the representation
     1707      <p id="rfc.section.4.3.4.8.p.2">Conflicts are most likely to occur in response to a PUT request. For example, if versioning were being used and the representation
    19871708         being PUT included changes to a resource which conflict with those made by an earlier (third-party) request, the server might
    19881709         use the 409 response to indicate that it can't complete the request. In this case, the response representation would likely
    19891710         contain a list of the differences between the two versions.
    19901711      </p>
    1991       <div id="rfc.iref.45"></div>
    1992       <div id="rfc.iref.s.25"></div>
    1993       <h3 id="rfc.section.7.4.9"><a href="#rfc.section.7.4.9">7.4.9</a>&nbsp;<a id="status.410" href="#status.410">410 Gone</a></h3>
    1994       <p id="rfc.section.7.4.9.p.1">The target resource is no longer available at the server and no forwarding address is known. This condition is expected to
     1712      <div id="rfc.iref.27"></div>
     1713      <div id="rfc.iref.s.24"></div>
     1714      <h4 id="rfc.section.4.3.4.9"><a href="#rfc.section.4.3.4.9">4.3.4.9</a>&nbsp;<a id="status.410" href="#status.410">410 Gone</a></h4>
     1715      <p id="rfc.section.4.3.4.9.p.1">The target resource is no longer available at the server and no forwarding address is known. This condition is expected to
    19951716         be considered permanent. Clients with link editing capabilities <em class="bcp14">SHOULD</em> delete references to the effective request URI after user approval. If the server does not know, or has no facility to determine,
    19961717         whether or not the condition is permanent, the status code 404 (Not Found) <em class="bcp14">SHOULD</em> be used instead.
    19971718      </p>
    1998       <p id="rfc.section.7.4.9.p.2">The 410 response is primarily intended to assist the task of web maintenance by notifying the recipient that the resource
     1719      <p id="rfc.section.4.3.4.9.p.2">The 410 response is primarily intended to assist the task of web maintenance by notifying the recipient that the resource
    19991720         is intentionally unavailable and that the server owners desire that remote links to that resource be removed. Such an event
    20001721         is common for limited-time, promotional services and for resources belonging to individuals no longer working at the server's
     
    20021723         — that is left to the discretion of the server owner.
    20031724      </p>
    2004       <p id="rfc.section.7.4.9.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.17"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 410 responses.
    2005       </p>
    2006       <div id="rfc.iref.46"></div>
     1725      <p id="rfc.section.4.3.4.9.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.12"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 410 responses.
     1726      </p>
     1727      <div id="rfc.iref.28"></div>
     1728      <div id="rfc.iref.s.25"></div>
     1729      <h4 id="rfc.section.4.3.4.10"><a href="#rfc.section.4.3.4.10">4.3.4.10</a>&nbsp;<a id="status.411" href="#status.411">411 Length Required</a></h4>
     1730      <p id="rfc.section.4.3.4.10.p.1">The server refuses to accept the request without a defined Content-Length. The client <em class="bcp14">MAY</em> repeat the request if it adds a valid Content-Length header field containing the length of the message body in the request
     1731         message.
     1732      </p>
     1733      <div id="rfc.iref.29"></div>
    20071734      <div id="rfc.iref.s.26"></div>
    2008       <h3 id="rfc.section.7.4.10"><a href="#rfc.section.7.4.10">7.4.10</a>&nbsp;<a id="status.411" href="#status.411">411 Length Required</a></h3>
    2009       <p id="rfc.section.7.4.10.p.1">The server refuses to accept the request without a defined Content-Length. The client <em class="bcp14">MAY</em> repeat the request if it adds a valid Content-Length header field containing the length of the message body in the request
    2010          message.
    2011       </p>
    2012       <div id="rfc.iref.47"></div>
     1735      <h4 id="rfc.section.4.3.4.11"><a href="#rfc.section.4.3.4.11">4.3.4.11</a>&nbsp;<a id="status.413" href="#status.413">413 Request Representation Too Large</a></h4>
     1736      <p id="rfc.section.4.3.4.11.p.1">The server is refusing to process a request because the request representation is larger than the server is willing or able
     1737         to process. The server <em class="bcp14">MAY</em> close the connection to prevent the client from continuing the request.
     1738      </p>
     1739      <p id="rfc.section.4.3.4.11.p.2">If the condition is temporary, the server <em class="bcp14">SHOULD</em> include a Retry-After header field to indicate that it is temporary and after what time the client <em class="bcp14">MAY</em> try again.
     1740      </p>
     1741      <div id="rfc.iref.30"></div>
    20131742      <div id="rfc.iref.s.27"></div>
    2014       <h3 id="rfc.section.7.4.11"><a href="#rfc.section.7.4.11">7.4.11</a>&nbsp;<a id="status.413" href="#status.413">413 Request Representation Too Large</a></h3>
    2015       <p id="rfc.section.7.4.11.p.1">The server is refusing to process a request because the request representation is larger than the server is willing or able
    2016          to process. The server <em class="bcp14">MAY</em> close the connection to prevent the client from continuing the request.
    2017       </p>
    2018       <p id="rfc.section.7.4.11.p.2">If the condition is temporary, the server <em class="bcp14">SHOULD</em> include a Retry-After header field to indicate that it is temporary and after what time the client <em class="bcp14">MAY</em> try again.
    2019       </p>
    2020       <div id="rfc.iref.48"></div>
    2021       <div id="rfc.iref.s.28"></div>
    2022       <h3 id="rfc.section.7.4.12"><a href="#rfc.section.7.4.12">7.4.12</a>&nbsp;<a id="status.414" href="#status.414">414 URI Too Long</a></h3>
    2023       <p id="rfc.section.7.4.12.p.1">The server is refusing to service the request because the effective request URI is longer than the server is willing to interpret.
     1743      <h4 id="rfc.section.4.3.4.12"><a href="#rfc.section.4.3.4.12">4.3.4.12</a>&nbsp;<a id="status.414" href="#status.414">414 URI Too Long</a></h4>
     1744      <p id="rfc.section.4.3.4.12.p.1">The server is refusing to service the request because the effective request URI is longer than the server is willing to interpret.
    20241745         This rare condition is only likely to occur when a client has improperly converted a POST request to a GET request with long
    20251746         query information, when the client has descended into a URI "black hole" of redirection (e.g., a redirected URI prefix that
     
    20271748         in some servers using fixed-length buffers for reading or manipulating the request-target.
    20281749      </p>
    2029       <div id="rfc.iref.49"></div>
     1750      <div id="rfc.iref.31"></div>
     1751      <div id="rfc.iref.s.28"></div>
     1752      <h4 id="rfc.section.4.3.4.13"><a href="#rfc.section.4.3.4.13">4.3.4.13</a>&nbsp;<a id="status.415" href="#status.415">415 Unsupported Media Type</a></h4>
     1753      <p id="rfc.section.4.3.4.13.p.1">The server is refusing to service the request because the request payload is in a format not supported by this request method
     1754         on the target resource.
     1755      </p>
     1756      <div id="rfc.iref.32"></div>
    20301757      <div id="rfc.iref.s.29"></div>
    2031       <h3 id="rfc.section.7.4.13"><a href="#rfc.section.7.4.13">7.4.13</a>&nbsp;<a id="status.415" href="#status.415">415 Unsupported Media Type</a></h3>
    2032       <p id="rfc.section.7.4.13.p.1">The server is refusing to service the request because the request payload is in a format not supported by this request method
    2033          on the target resource.
    2034       </p>
    2035       <div id="rfc.iref.50"></div>
     1758      <h4 id="rfc.section.4.3.4.14"><a href="#rfc.section.4.3.4.14">4.3.4.14</a>&nbsp;<a id="status.417" href="#status.417">417 Expectation Failed</a></h4>
     1759      <p id="rfc.section.4.3.4.14.p.1">The expectation given in an Expect header field (see <a href="#header.expect" id="rfc.xref.header.expect.2" title="Expect">Section&nbsp;8.3</a>) could not be met by this server, or, if the server is a proxy, the server has unambiguous evidence that the request could
     1760         not be met by the next-hop server.
     1761      </p>
     1762      <div id="rfc.iref.33"></div>
    20361763      <div id="rfc.iref.s.30"></div>
    2037       <h3 id="rfc.section.7.4.14"><a href="#rfc.section.7.4.14">7.4.14</a>&nbsp;<a id="status.417" href="#status.417">417 Expectation Failed</a></h3>
    2038       <p id="rfc.section.7.4.14.p.1">The expectation given in an Expect header field (see <a href="#header.expect" id="rfc.xref.header.expect.2" title="Expect">Section&nbsp;9.3</a>) could not be met by this server, or, if the server is a proxy, the server has unambiguous evidence that the request could
    2039          not be met by the next-hop server.
    2040       </p>
    2041       <div id="rfc.iref.51"></div>
    2042       <div id="rfc.iref.s.31"></div>
    2043       <h3 id="rfc.section.7.4.15"><a href="#rfc.section.7.4.15">7.4.15</a>&nbsp;<a id="status.426" href="#status.426">426 Upgrade Required</a></h3>
    2044       <p id="rfc.section.7.4.15.p.1">The request can not be completed without a prior protocol upgrade. This response <em class="bcp14">MUST</em> include an Upgrade header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.36"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) specifying the required protocols.
    2045       </p>
    2046       <div id="rfc.figure.u.8"></div>
     1764      <h4 id="rfc.section.4.3.4.15"><a href="#rfc.section.4.3.4.15">4.3.4.15</a>&nbsp;<a id="status.426" href="#status.426">426 Upgrade Required</a></h4>
     1765      <p id="rfc.section.4.3.4.15.p.1">The request can not be completed without a prior protocol upgrade. This response <em class="bcp14">MUST</em> include an Upgrade header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.30"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) specifying the required protocols.
     1766      </p>
     1767      <div id="rfc.figure.u.6"></div>
    20471768      <p>Example:</p>  <pre class="text">HTTP/1.1 426 Upgrade Required
    20481769Upgrade: HTTP/3.0
     
    20521773
    20531774<span id="s426body">This service requires use of the HTTP/3.0 protocol.
    2054 </span></pre><p id="rfc.section.7.4.15.p.3">The server <em class="bcp14">SHOULD</em> include a message body in the 426 response which indicates in human readable form the reason for the error and describes any
     1775</span></pre><p id="rfc.section.4.3.4.15.p.3">The server <em class="bcp14">SHOULD</em> include a message body in the 426 response which indicates in human readable form the reason for the error and describes any
    20551776         alternative courses which may be available to the user.
    20561777      </p>
    2057       <h2 id="rfc.section.7.5"><a href="#rfc.section.7.5">7.5</a>&nbsp;<a id="status.5xx" href="#status.5xx">Server Error 5xx</a></h2>
    2058       <p id="rfc.section.7.5.p.1">Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable
     1778      <h3 id="rfc.section.4.3.5"><a href="#rfc.section.4.3.5">4.3.5</a>&nbsp;<a id="status.5xx" href="#status.5xx">Server Error 5xx</a></h3>
     1779      <p id="rfc.section.4.3.5.p.1">Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable
    20591780         of performing the request. Except when responding to a HEAD request, the server <em class="bcp14">SHOULD</em> include a representation containing an explanation of the error situation, and whether it is a temporary or permanent condition.
    20601781         User agents <em class="bcp14">SHOULD</em> display any included representation to the user. These response codes are applicable to any request method.
    20611782      </p>
    2062       <div id="rfc.iref.52"></div>
     1783      <div id="rfc.iref.34"></div>
     1784      <div id="rfc.iref.s.31"></div>
     1785      <h4 id="rfc.section.4.3.5.1"><a href="#rfc.section.4.3.5.1">4.3.5.1</a>&nbsp;<a id="status.500" href="#status.500">500 Internal Server Error</a></h4>
     1786      <p id="rfc.section.4.3.5.1.p.1">The server encountered an unexpected condition which prevented it from fulfilling the request.</p>
     1787      <div id="rfc.iref.35"></div>
    20631788      <div id="rfc.iref.s.32"></div>
    2064       <h3 id="rfc.section.7.5.1"><a href="#rfc.section.7.5.1">7.5.1</a>&nbsp;<a id="status.500" href="#status.500">500 Internal Server Error</a></h3>
    2065       <p id="rfc.section.7.5.1.p.1">The server encountered an unexpected condition which prevented it from fulfilling the request.</p>
    2066       <div id="rfc.iref.53"></div>
     1789      <h4 id="rfc.section.4.3.5.2"><a href="#rfc.section.4.3.5.2">4.3.5.2</a>&nbsp;<a id="status.501" href="#status.501">501 Not Implemented</a></h4>
     1790      <p id="rfc.section.4.3.5.2.p.1">The server does not support the functionality required to fulfill the request. This is the appropriate response when the server
     1791         does not recognize the request method and is not capable of supporting it for any resource.
     1792      </p>
     1793      <div id="rfc.iref.36"></div>
    20671794      <div id="rfc.iref.s.33"></div>
    2068       <h3 id="rfc.section.7.5.2"><a href="#rfc.section.7.5.2">7.5.2</a>&nbsp;<a id="status.501" href="#status.501">501 Not Implemented</a></h3>
    2069       <p id="rfc.section.7.5.2.p.1">The server does not support the functionality required to fulfill the request. This is the appropriate response when the server
    2070          does not recognize the request method and is not capable of supporting it for any resource.
    2071       </p>
    2072       <div id="rfc.iref.54"></div>
     1795      <h4 id="rfc.section.4.3.5.3"><a href="#rfc.section.4.3.5.3">4.3.5.3</a>&nbsp;<a id="status.502" href="#status.502">502 Bad Gateway</a></h4>
     1796      <p id="rfc.section.4.3.5.3.p.1">The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting
     1797         to fulfill the request.
     1798      </p>
     1799      <div id="rfc.iref.37"></div>
    20731800      <div id="rfc.iref.s.34"></div>
    2074       <h3 id="rfc.section.7.5.3"><a href="#rfc.section.7.5.3">7.5.3</a>&nbsp;<a id="status.502" href="#status.502">502 Bad Gateway</a></h3>
    2075       <p id="rfc.section.7.5.3.p.1">The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting
    2076          to fulfill the request.
    2077       </p>
    2078       <div id="rfc.iref.55"></div>
    2079       <div id="rfc.iref.s.35"></div>
    2080       <h3 id="rfc.section.7.5.4"><a href="#rfc.section.7.5.4">7.5.4</a>&nbsp;<a id="status.503" href="#status.503">503 Service Unavailable</a></h3>
    2081       <p id="rfc.section.7.5.4.p.1">The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.</p>
    2082       <p id="rfc.section.7.5.4.p.2">The implication is that this is a temporary condition which will be alleviated after some delay. If known, the length of the
    2083          delay <em class="bcp14">MAY</em> be indicated in a Retry-After header field (<a href="#header.retry-after" id="rfc.xref.header.retry-after.2" title="Retry-After">Section&nbsp;9.8</a>). If no Retry-After is given, the client <em class="bcp14">SHOULD</em> handle the response as it would for a 500 response.
    2084       </p>
    2085       <div class="note" id="rfc.section.7.5.4.p.3">
     1801      <h4 id="rfc.section.4.3.5.4"><a href="#rfc.section.4.3.5.4">4.3.5.4</a>&nbsp;<a id="status.503" href="#status.503">503 Service Unavailable</a></h4>
     1802      <p id="rfc.section.4.3.5.4.p.1">The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.</p>
     1803      <p id="rfc.section.4.3.5.4.p.2">The implication is that this is a temporary condition which will be alleviated after some delay. If known, the length of the
     1804         delay <em class="bcp14">MAY</em> be indicated in a Retry-After header field (<a href="#header.retry-after" id="rfc.xref.header.retry-after.2" title="Retry-After">Section&nbsp;8.8</a>). If no Retry-After is given, the client <em class="bcp14">SHOULD</em> handle the response as it would for a 500 response.
     1805      </p>
     1806      <div class="note" id="rfc.section.4.3.5.4.p.3">
    20861807         <p> <b>Note:</b> The existence of the 503 status code does not imply that a server has to use it when becoming overloaded. Some servers might
    20871808            wish to simply refuse the connection.
    20881809         </p>
    20891810      </div>
    2090       <div id="rfc.iref.56"></div>
    2091       <div id="rfc.iref.s.36"></div>
    2092       <h3 id="rfc.section.7.5.5"><a href="#rfc.section.7.5.5">7.5.5</a>&nbsp;<a id="status.504" href="#status.504">504 Gateway Timeout</a></h3>
    2093       <p id="rfc.section.7.5.5.p.1">The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the
     1811      <div id="rfc.iref.38"></div>
     1812      <div id="rfc.iref.s.35"></div>
     1813      <h4 id="rfc.section.4.3.5.5"><a href="#rfc.section.4.3.5.5">4.3.5.5</a>&nbsp;<a id="status.504" href="#status.504">504 Gateway Timeout</a></h4>
     1814      <p id="rfc.section.4.3.5.5.p.1">The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the
    20941815         URI (e.g., HTTP, FTP, LDAP) or some other auxiliary server (e.g., DNS) it needed to access in attempting to complete the request.
    20951816      </p>
    2096       <div class="note" id="rfc.section.7.5.5.p.2">
     1817      <div class="note" id="rfc.section.4.3.5.5.p.2">
    20971818         <p> <b>Note</b> to implementors: some deployed proxies are known to return 400 or 500 when DNS lookups time out.
    20981819         </p>
    20991820      </div>
    2100       <div id="rfc.iref.57"></div>
     1821      <div id="rfc.iref.39"></div>
     1822      <div id="rfc.iref.s.36"></div>
     1823      <h4 id="rfc.section.4.3.5.6"><a href="#rfc.section.4.3.5.6">4.3.5.6</a>&nbsp;<a id="status.505" href="#status.505">505 HTTP Version Not Supported</a></h4>
     1824      <p id="rfc.section.4.3.5.6.p.1">The server does not support, or refuses to support, the protocol version that was used in the request message. The server
     1825         is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described
     1826         in <a href="p1-messaging.html#http.version" title="Protocol Versioning">Section 2.6</a> of <a href="#Part1" id="rfc.xref.Part1.31"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, other than with this error message. The response <em class="bcp14">SHOULD</em> contain a representation describing why that version is not supported and what other protocols are supported by that server.
     1827      </p>
     1828      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="representation" href="#representation">Representation</a></h1>
     1829      <p id="rfc.section.5.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer a representation if not otherwise restricted by the request method or response status code. A representation consists
     1830         of metadata (representation header fields) and data (representation body). When a complete or partial representation is enclosed
     1831         in an HTTP message, it is referred to as the payload of the message. HTTP representations are defined in <a href="#Part3" id="rfc.xref.Part3.11"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
     1832      </p>
     1833      <p id="rfc.section.5.p.2">A representation body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.32"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The representation body is obtained from the message body by decoding any Transfer-Encoding that might have been applied
     1834         to ensure safe and proper transfer of the message.
     1835      </p>
     1836      <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="identifying.response.associated.with.representation" href="#identifying.response.associated.with.representation">Identifying the Resource Associated with a Representation</a></h2>
     1837      <p id="rfc.section.5.1.p.1">It is sometimes necessary to determine an identifier for the resource associated with a representation.</p>
     1838      <p id="rfc.section.5.1.p.2">An HTTP request representation, when present, is always associated with an anonymous (i.e., unidentified) resource.</p>
     1839      <p id="rfc.section.5.1.p.3">In the common case, an HTTP response is a representation of the target resource (see <a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.33"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). However, this is not always the case. To determine the URI of the resource a response is associated with, the following
     1840         rules are used (with the first applicable one being selected):
     1841      </p>
     1842      <ol>
     1843         <li>If the response status code is 200 or 203 and the request method was GET, the response payload is a representation of the
     1844            target resource.
     1845         </li>
     1846         <li>If the response status code is 204, 206, or 304 and the request method was GET or HEAD, the response payload is a partial
     1847            representation of the target resource.
     1848         </li>
     1849         <li>If the response has a Content-Location header field, and that URI is the same as the effective request URI, the response payload
     1850            is a representation of the target resource.
     1851         </li>
     1852         <li>If the response has a Content-Location header field, and that URI is not the same as the effective request URI, then the response
     1853            asserts that its payload is a representation of the resource identified by the Content-Location URI. However, such an assertion
     1854            cannot be trusted unless it can be verified by other means (not defined by HTTP).
     1855         </li>
     1856         <li>Otherwise, the response is a representation of an anonymous (i.e., unidentified) resource.</li>
     1857      </ol>
     1858      <p id="rfc.section.5.1.p.5"> <span class="comment" id="TODO-req-uri">[<a href="#TODO-req-uri" class="smpl">TODO-req-uri</a>: The comparison function is going to have to be defined somewhere, because we already need to compare URIs for things like
     1859            cache invalidation.]</span>
     1860      </p>
     1861      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="method.definitions" href="#method.definitions">Method Definitions</a></h1>
     1862      <p id="rfc.section.6.p.1">The set of common request methods for HTTP/1.1 is defined below. Although this set can be expanded, additional methods cannot
     1863         be assumed to share the same semantics for separately extended clients and servers.
     1864      </p>
     1865      <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="safe.and.idempotent" href="#safe.and.idempotent">Safe and Idempotent Methods</a></h2>
    21011866      <div id="rfc.iref.s.37"></div>
    2102       <h3 id="rfc.section.7.5.6"><a href="#rfc.section.7.5.6">7.5.6</a>&nbsp;<a id="status.505" href="#status.505">505 HTTP Version Not Supported</a></h3>
    2103       <p id="rfc.section.7.5.6.p.1">The server does not support, or refuses to support, the protocol version that was used in the request message. The server
    2104          is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described
    2105          in <a href="p1-messaging.html#http.version" title="Protocol Versioning">Section 2.6</a> of <a href="#Part1" id="rfc.xref.Part1.37"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, other than with this error message. The response <em class="bcp14">SHOULD</em> contain a representation describing why that version is not supported and what other protocols are supported by that server.
    2106       </p>
    2107       <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="common.protocol.parameters" href="#common.protocol.parameters">Common Protocol Parameters</a></h1>
    2108       <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="http.date" href="#http.date">Date/Time Formats</a></h2>
    2109       <p id="rfc.section.8.1.p.1">HTTP applications have historically allowed three different formats for date/time stamps. However, the preferred format is
     1867      <h3 id="rfc.section.6.1.1"><a href="#rfc.section.6.1.1">6.1.1</a>&nbsp;<a id="safe.methods" href="#safe.methods">Safe Methods</a></h3>
     1868      <p id="rfc.section.6.1.1.p.1">Implementors need to be aware that the software represents the user in their interactions over the Internet, and need to allow
     1869         the user to be aware of any actions they take which might have an unexpected significance to themselves or others.
     1870      </p>
     1871      <p id="rfc.section.6.1.1.p.2">In particular, the convention has been established that the GET, HEAD, OPTIONS, and TRACE request methods <em class="bcp14">SHOULD NOT</em> have the significance of taking an action other than retrieval. These request methods ought to be considered "<dfn id="safe">safe</dfn>". This allows user agents to represent other methods, such as POST, PUT and DELETE, in a special way, so that the user is
     1872         made aware of the fact that a possibly unsafe action is being requested.
     1873      </p>
     1874      <p id="rfc.section.6.1.1.p.3">Naturally, it is not possible to ensure that the server does not generate side-effects as a result of performing a GET request;
     1875         in fact, some dynamic resources consider that a feature. The important distinction here is that the user did not request the
     1876         side-effects, so therefore cannot be held accountable for them.
     1877      </p>
     1878      <div id="rfc.iref.i.1"></div>
     1879      <h3 id="rfc.section.6.1.2"><a href="#rfc.section.6.1.2">6.1.2</a>&nbsp;<a id="idempotent.methods" href="#idempotent.methods">Idempotent Methods</a></h3>
     1880      <p id="rfc.section.6.1.2.p.1">Request methods can also have the property of "idempotence" in that, aside from error or expiration issues, the intended effect
     1881         of multiple identical requests is the same as for a single request. PUT, DELETE, and all safe request methods are idempotent.
     1882         It is important to note that idempotence refers only to changes requested by the client: a server is free to change its state
     1883         due to multiple requests for the purpose of tracking those requests, versioning of results, etc.
     1884      </p>
     1885      <h2 id="rfc.section.6.2"><a href="#rfc.section.6.2">6.2</a>&nbsp;<a id="OPTIONS" href="#OPTIONS">OPTIONS</a></h2>
     1886      <div id="rfc.iref.o.1"></div>
     1887      <div id="rfc.iref.m.1"></div>
     1888      <p id="rfc.section.6.2.p.1">The OPTIONS method requests information about the communication options available on the request/response chain identified
     1889         by the effective request URI. This method allows a client to determine the options and/or requirements associated with a resource,
     1890         or the capabilities of a server, without implying a resource action or initiating a resource retrieval.
     1891      </p>
     1892      <p id="rfc.section.6.2.p.2">Responses to the OPTIONS method are not cacheable.</p>
     1893      <p id="rfc.section.6.2.p.3">If the OPTIONS request includes a message body (as indicated by the presence of Content-Length or Transfer-Encoding), then
     1894         the media type <em class="bcp14">MUST</em> be indicated by a Content-Type field. Although this specification does not define any use for such a body, future extensions
     1895         to HTTP might use the OPTIONS body to make more detailed queries on the server.
     1896      </p>
     1897      <p id="rfc.section.6.2.p.4">If the request-target (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.34"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is an asterisk ("*"), the OPTIONS request is intended to apply to the server in general rather than to a specific resource.
     1898         Since a server's communication options typically depend on the resource, the "*" request is only useful as a "ping" or "no-op"
     1899         type of method; it does nothing beyond allowing the client to test the capabilities of the server. For example, this can be
     1900         used to test a proxy for HTTP/1.1 conformance (or lack thereof).
     1901      </p>
     1902      <p id="rfc.section.6.2.p.5">If the request-target is not an asterisk, the OPTIONS request applies only to the options that are available when communicating
     1903         with that resource.
     1904      </p>
     1905      <p id="rfc.section.6.2.p.6">A 200 response <em class="bcp14">SHOULD</em> include any header fields that indicate optional features implemented by the server and applicable to that resource (e.g.,
     1906         Allow), possibly including extensions not defined by this specification. The response body, if any, <em class="bcp14">SHOULD</em> also include information about the communication options. The format for such a body is not defined by this specification,
     1907         but might be defined by future extensions to HTTP. Content negotiation <em class="bcp14">MAY</em> be used to select the appropriate response format. If no response body is included, the response <em class="bcp14">MUST</em> include a Content-Length field with a field-value of "0".
     1908      </p>
     1909      <p id="rfc.section.6.2.p.7">The Max-Forwards header field <em class="bcp14">MAY</em> be used to target a specific proxy in the request chain (see <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.2" title="Max-Forwards">Section&nbsp;8.6</a>). If no Max-Forwards field is present in the request, then the forwarded request <em class="bcp14">MUST NOT</em> include a Max-Forwards field.
     1910      </p>
     1911      <h2 id="rfc.section.6.3"><a href="#rfc.section.6.3">6.3</a>&nbsp;<a id="GET" href="#GET">GET</a></h2>
     1912      <div id="rfc.iref.g.5"></div>
     1913      <div id="rfc.iref.m.2"></div>
     1914      <p id="rfc.section.6.3.p.1">The GET method requests transfer of a current representation of the target resource.</p>
     1915      <p id="rfc.section.6.3.p.2">If the target resource is a data-producing process, it is the produced data which shall be returned as the representation
     1916         in the response and not the source text of the process, unless that text happens to be the output of the process.
     1917      </p>
     1918      <p id="rfc.section.6.3.p.3">The semantics of the GET method change to a "conditional GET" if the request message includes an If-Modified-Since, If-Unmodified-Since,
     1919         If-Match, If-None-Match, or If-Range header field. A conditional GET requests that the representation be transferred only
     1920         under the circumstances described by the conditional header field(s). The conditional GET request is intended to reduce unnecessary
     1921         network usage by allowing cached representations to be refreshed without requiring multiple requests or transferring data
     1922         already held by the client.
     1923      </p>
     1924      <p id="rfc.section.6.3.p.4">The semantics of the GET method change to a "partial GET" if the request message includes a Range header field. A partial
     1925         GET requests that only part of the representation be transferred, as described in <a href="p5-range.html#header.range" title="Range">Section 5.4</a> of <a href="#Part5" id="rfc.xref.Part5.7"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>. The partial GET request is intended to reduce unnecessary network usage by allowing partially-retrieved representations
     1926         to be completed without transferring data already held by the client.
     1927      </p>
     1928      <p id="rfc.section.6.3.p.5">Bodies on GET requests have no defined semantics. Note that sending a body on a GET request might cause some existing implementations
     1929         to reject the request.
     1930      </p>
     1931      <p id="rfc.section.6.3.p.6">The response to a GET request is cacheable and <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests (see <a href="#Part6" id="rfc.xref.Part6.13"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     1932      </p>
     1933      <p id="rfc.section.6.3.p.7">See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;10.2</a> for security considerations when used for forms.
     1934      </p>
     1935      <h2 id="rfc.section.6.4"><a href="#rfc.section.6.4">6.4</a>&nbsp;<a id="HEAD" href="#HEAD">HEAD</a></h2>
     1936      <div id="rfc.iref.h.1"></div>
     1937      <div id="rfc.iref.m.3"></div>
     1938      <p id="rfc.section.6.4.p.1">The HEAD method is identical to GET except that the server <em class="bcp14">MUST NOT</em> return a message body in the response. The metadata contained in the HTTP header fields in response to a HEAD request <em class="bcp14">SHOULD</em> be identical to the information sent in response to a GET request. This method can be used for obtaining metadata about the
     1939         representation implied by the request without transferring the representation body. This method is often used for testing
     1940         hypertext links for validity, accessibility, and recent modification.
     1941      </p>
     1942      <p id="rfc.section.6.4.p.2">The response to a HEAD request is cacheable and <em class="bcp14">MAY</em> be used to satisfy a subsequent HEAD request. It also has potential side effects on previously stored responses to GET; see <a href="p6-cache.html#head.effects" title="Updating Caches with HEAD Responses">Section 2.5</a> of <a href="#Part6" id="rfc.xref.Part6.14"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>.
     1943      </p>
     1944      <p id="rfc.section.6.4.p.3">Bodies on HEAD requests have no defined semantics. Note that sending a body on a HEAD request might cause some existing implementations
     1945         to reject the request.
     1946      </p>
     1947      <div id="rfc.iref.p.1"></div>
     1948      <div id="rfc.iref.m.4"></div>
     1949      <h2 id="rfc.section.6.5"><a href="#rfc.section.6.5">6.5</a>&nbsp;<a id="POST" href="#POST">POST</a></h2>
     1950      <p id="rfc.section.6.5.p.1">The POST method requests that the origin server accept the representation enclosed in the request as data to be processed
     1951         by the target resource. POST is designed to allow a uniform method to cover the following functions:
     1952      </p>
     1953      <ul>
     1954         <li>Annotation of existing resources;</li>
     1955         <li>Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles;</li>
     1956         <li>Providing a block of data, such as the result of submitting a form, to a data-handling process;</li>
     1957         <li>Extending a database through an append operation.</li>
     1958      </ul>
     1959      <p id="rfc.section.6.5.p.2">The actual function performed by the POST method is determined by the server and is usually dependent on the effective request
     1960         URI.
     1961      </p>
     1962      <p id="rfc.section.6.5.p.3">The action performed by the POST method might not result in a resource that can be identified by a URI. In this case, either
     1963         200 (OK) or 204 (No Content) is the appropriate response status code, depending on whether or not the response includes a
     1964         representation that describes the result.
     1965      </p>
     1966      <p id="rfc.section.6.5.p.4">If a resource has been created on the origin server, the response <em class="bcp14">SHOULD</em> be 201 (Created) and contain a representation which describes the status of the request and refers to the new resource, and
     1967         a Location header field (see <a href="#header.location" id="rfc.xref.header.location.3" title="Location">Section&nbsp;8.5</a>).
     1968      </p>
     1969      <p id="rfc.section.6.5.p.5">Responses to POST requests are only cacheable when they include explicit freshness information (see <a href="p6-cache.html#calculating.freshness.lifetime" title="Calculating Freshness Lifetime">Section 2.3.1</a> of <a href="#Part6" id="rfc.xref.Part6.15"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). A cached POST response with a Content-Location header field (see <a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.12"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) whose value is the effective Request URI <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests.
     1970      </p>
     1971      <p id="rfc.section.6.5.p.6">Note that POST caching is not widely implemented. However, the 303 (See Other) response can be used to direct the user agent
     1972         to retrieve a cacheable representation of the resource.
     1973      </p>
     1974      <div id="rfc.iref.p.2"></div>
     1975      <div id="rfc.iref.m.5"></div>
     1976      <h2 id="rfc.section.6.6"><a href="#rfc.section.6.6">6.6</a>&nbsp;<a id="PUT" href="#PUT">PUT</a></h2>
     1977      <p id="rfc.section.6.6.p.1">The PUT method requests that the state of the target resource be created or replaced with the state defined by the representation
     1978         enclosed in the request message payload. A successful PUT of a given representation would suggest that a subsequent GET on
     1979         that same target resource will result in an equivalent representation being returned in a 200 (OK) response. However, there
     1980         is no guarantee that such a state change will be observable, since the target resource might be acted upon by other user agents
     1981         in parallel, or might be subject to dynamic processing by the origin server, before any subsequent GET is received. A successful
     1982         response only implies that the user agent's intent was achieved at the time of its processing by the origin server.
     1983      </p>
     1984      <p id="rfc.section.6.6.p.2">If the target resource does not have a current representation and the PUT successfully creates one, then the origin server <em class="bcp14">MUST</em> inform the user agent by sending a 201 (Created) response. If the target resource does have a current representation and that
     1985         representation is successfully modified in accordance with the state of the enclosed representation, then either a 200 (OK)
     1986         or 204 (No Content) response <em class="bcp14">SHOULD</em> be sent to indicate successful completion of the request.
     1987      </p>
     1988      <p id="rfc.section.6.6.p.3">Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored (i.e., not saved as part of the resource state).
     1989      </p>
     1990      <p id="rfc.section.6.6.p.4">An origin server <em class="bcp14">SHOULD</em> verify that the PUT representation is consistent with any constraints which the server has for the target resource that cannot
     1991         or will not be changed by the PUT. This is particularly important when the origin server uses internal configuration information
     1992         related to the URI in order to set the values for representation metadata on GET responses. When a PUT representation is inconsistent
     1993         with the target resource, the origin server <em class="bcp14">SHOULD</em> either make them consistent, by transforming the representation or changing the resource configuration, or respond with an
     1994         appropriate error message containing sufficient information to explain why the representation is unsuitable. The 409 (Conflict)
     1995         or 415 (Unsupported Media Type) status codes are suggested, with the latter being specific to constraints on Content-Type
     1996         values.
     1997      </p>
     1998      <p id="rfc.section.6.6.p.5">For example, if the target resource is configured to always have a Content-Type of "text/html" and the representation being
     1999         PUT has a Content-Type of "image/jpeg", then the origin server <em class="bcp14">SHOULD</em> do one of: (a) reconfigure the target resource to reflect the new media type; (b) transform the PUT representation to a format
     2000         consistent with that of the resource before saving it as the new resource state; or, (c) reject the request with a 415 response
     2001         indicating that the target resource is limited to "text/html", perhaps including a link to a different resource that would
     2002         be a suitable target for the new representation.
     2003      </p>
     2004      <p id="rfc.section.6.6.p.6">HTTP does not define exactly how a PUT method affects the state of an origin server beyond what can be expressed by the intent
     2005         of the user agent request and the semantics of the origin server response. It does not define what a resource might be, in
     2006         any sense of that word, beyond the interface provided via HTTP. It does not define how resource state is "stored", nor how
     2007         such storage might change as a result of a change in resource state, nor how the origin server translates resource state into
     2008         representations. Generally speaking, all implementation details behind the resource interface are intentionally hidden by
     2009         the server.
     2010      </p>
     2011      <p id="rfc.section.6.6.p.7">The fundamental difference between the POST and PUT methods is highlighted by the different intent for the target resource.
     2012         The target resource in a POST request is intended to handle the enclosed representation as a data-accepting process, such
     2013         as for a gateway to some other protocol or a document that accepts annotations. In contrast, the target resource in a PUT
     2014         request is intended to take the enclosed representation as a new or replacement value. Hence, the intent of PUT is idempotent
     2015         and visible to intermediaries, even though the exact effect is only known by the origin server.
     2016      </p>
     2017      <p id="rfc.section.6.6.p.8">Proper interpretation of a PUT request presumes that the user agent knows what target resource is desired. A service that
     2018         is intended to select a proper URI on behalf of the client, after receiving a state-changing request, <em class="bcp14">SHOULD</em> be implemented using the POST method rather than PUT. If the origin server will not make the requested PUT state change to
     2019         the target resource and instead wishes to have it applied to a different resource, such as when the resource has been moved
     2020         to a different URI, then the origin server <em class="bcp14">MUST</em> send a 301 (Moved Permanently) response; the user agent <em class="bcp14">MAY</em> then make its own decision regarding whether or not to redirect the request.
     2021      </p>
     2022      <p id="rfc.section.6.6.p.9">A PUT request applied to the target resource <em class="bcp14">MAY</em> have side-effects on other resources. For example, an article might have a URI for identifying "the current version" (a resource)
     2023         which is separate from the URIs identifying each particular version (different resources that at one point shared the same
     2024         state as the current version resource). A successful PUT request on "the current version" URI might therefore create a new
     2025         version resource in addition to changing the state of the target resource, and might also cause links to be added between
     2026         the related resources.
     2027      </p>
     2028      <p id="rfc.section.6.6.p.10">An origin server <em class="bcp14">SHOULD</em> reject any PUT request that contains a Content-Range header field, since it might be misinterpreted as partial content (or
     2029         might be partial content that is being mistakenly PUT as a full representation). Partial content updates are possible by targeting
     2030         a separately identified resource with state that overlaps a portion of the larger resource, or by using a different method
     2031         that has been specifically defined for partial updates (for example, the PATCH method defined in <a href="#RFC5789" id="rfc.xref.RFC5789.1"><cite title="PATCH Method for HTTP">[RFC5789]</cite></a>).
     2032      </p>
     2033      <p id="rfc.section.6.6.p.11">Responses to the PUT method are not cacheable. If a PUT request passes through a cache that has one or more stored responses
     2034         for the effective request URI, those stored responses will be invalidated (see <a href="p6-cache.html#invalidation.after.updates.or.deletions" title="Request Methods that Invalidate">Section 2.6</a> of <a href="#Part6" id="rfc.xref.Part6.16"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     2035      </p>
     2036      <div id="rfc.iref.d.1"></div>
     2037      <div id="rfc.iref.m.6"></div>
     2038      <h2 id="rfc.section.6.7"><a href="#rfc.section.6.7">6.7</a>&nbsp;<a id="DELETE" href="#DELETE">DELETE</a></h2>
     2039      <p id="rfc.section.6.7.p.1">The DELETE method requests that the origin server delete the target resource. This method <em class="bcp14">MAY</em> be overridden by human intervention (or other means) on the origin server. The client cannot be guaranteed that the operation
     2040         has been carried out, even if the status code returned from the origin server indicates that the action has been completed
     2041         successfully. However, the server <em class="bcp14">SHOULD NOT</em> indicate success unless, at the time the response is given, it intends to delete the resource or move it to an inaccessible
     2042         location.
     2043      </p>
     2044      <p id="rfc.section.6.7.p.2">A successful response <em class="bcp14">SHOULD</em> be 200 (OK) if the response includes an representation describing the status, 202 (Accepted) if the action has not yet been
     2045         enacted, or 204 (No Content) if the action has been enacted but the response does not include a representation.
     2046      </p>
     2047      <p id="rfc.section.6.7.p.3">Bodies on DELETE requests have no defined semantics. Note that sending a body on a DELETE request might cause some existing
     2048         implementations to reject the request.
     2049      </p>
     2050      <p id="rfc.section.6.7.p.4">Responses to the DELETE method are not cacheable. If a DELETE request passes through a cache that has one or more stored responses
     2051         for the effective request URI, those stored responses will be invalidated (see <a href="p6-cache.html#invalidation.after.updates.or.deletions" title="Request Methods that Invalidate">Section 2.6</a> of <a href="#Part6" id="rfc.xref.Part6.17"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     2052      </p>
     2053      <h2 id="rfc.section.6.8"><a href="#rfc.section.6.8">6.8</a>&nbsp;<a id="TRACE" href="#TRACE">TRACE</a></h2>
     2054      <div id="rfc.iref.t.1"></div>
     2055      <div id="rfc.iref.m.7"></div>
     2056      <p id="rfc.section.6.8.p.1">The TRACE method requests a remote, application-layer loop-back of the request message. The final recipient of the request <em class="bcp14">SHOULD</em> reflect the message received back to the client as the message body of a 200 (OK) response. The final recipient is either
     2057         the origin server or the first proxy to receive a Max-Forwards value of zero (0) in the request (see <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.3" title="Max-Forwards">Section&nbsp;8.6</a>). A TRACE request <em class="bcp14">MUST NOT</em> include a message body.
     2058      </p>
     2059      <p id="rfc.section.6.8.p.2">TRACE allows the client to see what is being received at the other end of the request chain and use that data for testing
     2060         or diagnostic information. The value of the Via header field (<a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.35"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the Max-Forwards header field allows the
     2061         client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding messages in an
     2062         infinite loop.
     2063      </p>
     2064      <p id="rfc.section.6.8.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> have a Content-Type of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 7.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.36"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and contain a message body that encloses a copy of the entire request message. Responses to the TRACE method are not cacheable.
     2065      </p>
     2066      <div id="rfc.iref.c.1"></div>
     2067      <div id="rfc.iref.m.8"></div>
     2068      <h2 id="rfc.section.6.9"><a href="#rfc.section.6.9">6.9</a>&nbsp;<a id="CONNECT" href="#CONNECT">CONNECT</a></h2>
     2069      <p id="rfc.section.6.9.p.1">The CONNECT method requests that the proxy establish a tunnel to the request-target and, if successful, thereafter restrict
     2070         its behavior to blind forwarding of packets until the connection is closed.
     2071      </p>
     2072      <p id="rfc.section.6.9.p.2">When using CONNECT, the request-target <em class="bcp14">MUST</em> use the authority form (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.37"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>); i.e., the request-target consists of only the host name and port number of the tunnel destination, separated by a colon.
     2073         For example,
     2074      </p>
     2075      <div id="rfc.figure.u.7"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
     2076Host: server.example.com:80
     2077
     2078</pre><p id="rfc.section.6.9.p.4">Any successful (2xx) response to a CONNECT request indicates that the proxy has established a connection to the requested
     2079         host and port, and has switched to tunneling the current connection to that server connection. The tunneled data from the
     2080         server begins immediately after the blank line that concludes the successful response's header block. A server <em class="bcp14">SHOULD NOT</em> send any Transfer-Encoding or Content-Length header fields in a successful response. A client <em class="bcp14">MUST</em> ignore any Content-Length or Transfer-Encoding header fields received in a successful response.
     2081      </p>
     2082      <p id="rfc.section.6.9.p.5">Any response other than a successful response indicates that the tunnel has not yet been formed and that the connection remains
     2083         governed by HTTP.
     2084      </p>
     2085      <p id="rfc.section.6.9.p.6">Proxy authentication might be used to establish the authority to create a tunnel:</p>
     2086      <div id="rfc.figure.u.8"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
     2087Host: server.example.com:80
     2088Proxy-Authorization: basic aGVsbG86d29ybGQ=
     2089
     2090</pre><p id="rfc.section.6.9.p.8">A message body on a CONNECT request has no defined semantics. Sending a body on a CONNECT request might cause existing implementations
     2091         to reject the request.
     2092      </p>
     2093      <p id="rfc.section.6.9.p.9">Similar to a pipelined HTTP/1.1 request, data to be tunneled from client to server <em class="bcp14">MAY</em> be sent immediately after the request (before a response is received). The usual caveats also apply: data may be discarded
     2094         if the eventual response is negative, and the connection may be reset with no response if more than one TCP segment is outstanding.
     2095      </p>
     2096      <p id="rfc.section.6.9.p.10">It may be the case that the proxy itself can only reach the requested origin server through another proxy. In this case, the
     2097         first proxy <em class="bcp14">SHOULD</em> make a CONNECT request of that next proxy, requesting a tunnel to the authority. A proxy <em class="bcp14">MUST NOT</em> respond with any 2xx status code unless it has either a direct or tunnel connection established to the authority.
     2098      </p>
     2099      <p id="rfc.section.6.9.p.11">If at any point either one of the peers gets disconnected, any outstanding data that came from that peer will be passed to
     2100         the other one, and after that also the other connection will be terminated by the proxy. If there is outstanding data to that
     2101         peer undelivered, that data will be discarded.
     2102      </p>
     2103      <p id="rfc.section.6.9.p.12">An origin server which receives a CONNECT request for itself <em class="bcp14">MAY</em> respond with a 2xx status code to indicate that a connection is established. However, most origin servers do not implement
     2104         CONNECT.
     2105      </p>
     2106      <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="common.protocol.parameters" href="#common.protocol.parameters">Common Protocol Parameters</a></h1>
     2107      <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="http.date" href="#http.date">Date/Time Formats</a></h2>
     2108      <p id="rfc.section.7.1.p.1">HTTP applications have historically allowed three different formats for date/time stamps. However, the preferred format is
    21102109         a fixed-length subset of that defined by <a href="#RFC1123" id="rfc.xref.RFC1123.1"><cite title="Requirements for Internet Hosts - Application and Support">[RFC1123]</cite></a>:
    21112110      </p>
    21122111      <div id="rfc.figure.u.9"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
    2113 </pre><p id="rfc.section.8.1.p.3">The other formats are described here only for compatibility with obsolete implementations.</p>
     2112</pre><p id="rfc.section.7.1.p.3">The other formats are described here only for compatibility with obsolete implementations.</p>
    21142113      <div id="rfc.figure.u.10"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
    21152114Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
    2116 </pre><p id="rfc.section.8.1.p.5">HTTP/1.1 clients and servers that parse a date value <em class="bcp14">MUST</em> accept all three formats (for compatibility with HTTP/1.0), though they <em class="bcp14">MUST</em> only generate the RFC 1123 format for representing HTTP-date values in header fields.
    2117       </p>
    2118       <p id="rfc.section.8.1.p.6">All HTTP date/time stamps <em class="bcp14">MUST</em> be represented in Greenwich Mean Time (GMT), without exception. For the purposes of HTTP, GMT is exactly equal to UTC (Coordinated
     2115</pre><p id="rfc.section.7.1.p.5">HTTP/1.1 clients and servers that parse a date value <em class="bcp14">MUST</em> accept all three formats (for compatibility with HTTP/1.0), though they <em class="bcp14">MUST</em> only generate the RFC 1123 format for representing HTTP-date values in header fields.
     2116      </p>
     2117      <p id="rfc.section.7.1.p.6">All HTTP date/time stamps <em class="bcp14">MUST</em> be represented in Greenwich Mean Time (GMT), without exception. For the purposes of HTTP, GMT is exactly equal to UTC (Coordinated
    21192118         Universal Time). This is indicated in the first two formats by the inclusion of "GMT" as the three-letter abbreviation for
    21202119         time zone, and <em class="bcp14">MUST</em> be assumed when reading the asctime format. HTTP-date is case sensitive and <em class="bcp14">MUST NOT</em> include additional whitespace beyond that specifically included as SP in the grammar.
     
    21222121      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.6"></span>  <a href="#http.date" class="smpl">HTTP-date</a>    = <a href="#preferred.date.format" class="smpl">rfc1123-date</a> / <a href="#obsolete.date.formats" class="smpl">obs-date</a>
    21232122</pre><div id="preferred.date.format">
    2124          <p id="rfc.section.8.1.p.8">                    Preferred format:</p>
     2123         <p id="rfc.section.7.1.p.8">                    Preferred format:</p>
    21252124      </div>
    21262125      <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span><span id="rfc.iref.g.10"></span><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span><span id="rfc.iref.g.16"></span><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span>  <a href="#preferred.date.format" class="smpl">rfc1123-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> "," <a href="#notation" class="smpl">SP</a> date1 <a href="#notation" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#notation" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
     
    21622161  <a href="#preferred.date.format" class="smpl">minute</a>       = 2<a href="#notation" class="smpl">DIGIT</a>               
    21632162  <a href="#preferred.date.format" class="smpl">second</a>       = 2<a href="#notation" class="smpl">DIGIT</a>               
    2164 </pre><p id="rfc.section.8.1.p.10">The semantics of <a href="#preferred.date.format" class="smpl">day-name</a>, <a href="#preferred.date.format" class="smpl">day</a>, <a href="#preferred.date.format" class="smpl">month</a>, <a href="#preferred.date.format" class="smpl">year</a>, and <a href="#preferred.date.format" class="smpl">time-of-day</a> are the same as those defined for the RFC 5322 constructs with the corresponding name (<a href="#RFC5322" id="rfc.xref.RFC5322.1"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.3">Section 3.3</a>).
     2163</pre><p id="rfc.section.7.1.p.10">The semantics of <a href="#preferred.date.format" class="smpl">day-name</a>, <a href="#preferred.date.format" class="smpl">day</a>, <a href="#preferred.date.format" class="smpl">month</a>, <a href="#preferred.date.format" class="smpl">year</a>, and <a href="#preferred.date.format" class="smpl">time-of-day</a> are the same as those defined for the RFC 5322 constructs with the corresponding name (<a href="#RFC5322" id="rfc.xref.RFC5322.1"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.3">Section 3.3</a>).
    21652164      </p>
    21662165      <div id="obsolete.date.formats">
    2167          <p id="rfc.section.8.1.p.11">                Obsolete formats:</p>
     2166         <p id="rfc.section.7.1.p.11">                Obsolete formats:</p>
    21682167      </div>
    21692168      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.19"></span>  <a href="#obsolete.date.formats" class="smpl">obs-date</a>     = <a href="#obsolete.date.formats" class="smpl">rfc850-date</a> / <a href="#obsolete.date.formats" class="smpl">asctime-date</a>
     
    21822181  <a href="#obsolete.date.formats" class="smpl">date3</a>        = <a href="#preferred.date.format" class="smpl">month</a> <a href="#notation" class="smpl">SP</a> ( 2<a href="#notation" class="smpl">DIGIT</a> / ( <a href="#notation" class="smpl">SP</a> 1<a href="#notation" class="smpl">DIGIT</a> ))
    21832182                 ; month day (e.g., Jun  2)
    2184 </pre><div class="note" id="rfc.section.8.1.p.15">
     2183</pre><div class="note" id="rfc.section.7.1.p.15">
    21852184         <p> <b>Note:</b> Recipients of date values are encouraged to be robust in accepting date values that might have been sent by non-HTTP applications,
    21862185            as is sometimes the case when retrieving or posting messages via proxies/gateways to SMTP or NNTP.
    21872186         </p>
    21882187      </div>
    2189       <div class="note" id="rfc.section.8.1.p.16">
     2188      <div class="note" id="rfc.section.7.1.p.16">
    21902189         <p> <b>Note:</b> HTTP requirements for the date/time stamp format apply only to their usage within the protocol stream. Clients and servers
    21912190            are not required to use these formats for user presentation, request logging, etc.
    21922191         </p>
    21932192      </div>
    2194       <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a id="product.tokens" href="#product.tokens">Product Tokens</a></h2>
    2195       <p id="rfc.section.8.2.p.1">Product tokens are used to allow communicating applications to identify themselves by software name and version. Most fields
     2193      <h2 id="rfc.section.7.2"><a href="#rfc.section.7.2">7.2</a>&nbsp;<a id="product.tokens" href="#product.tokens">Product Tokens</a></h2>
     2194      <p id="rfc.section.7.2.p.1">Product tokens are used to allow communicating applications to identify themselves by software name and version. Most fields
    21962195         using product tokens also allow sub-products which form a significant part of the application to be listed, separated by whitespace.
    21972196         By convention, the products are listed in order of their significance for identifying the application.
     
    21992198      <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  <a href="#product.tokens" class="smpl">product</a>         = <a href="#core.rules" class="smpl">token</a> ["/" <a href="#product.tokens" class="smpl">product-version</a>]
    22002199  <a href="#product.tokens" class="smpl">product-version</a> = <a href="#core.rules" class="smpl">token</a>
    2201 </pre><p id="rfc.section.8.2.p.3">Examples:</p>
     2200</pre><p id="rfc.section.7.2.p.3">Examples:</p>
    22022201      <div id="rfc.figure.u.17"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    22032202  Server: Apache/0.8.4
    2204 </pre><p id="rfc.section.8.2.p.5">Product tokens <em class="bcp14">SHOULD</em> be short and to the point. They <em class="bcp14">MUST NOT</em> be used for advertising or other non-essential information. Although any token octet <em class="bcp14">MAY</em> appear in a product-version, this token <em class="bcp14">SHOULD</em> only be used for a version identifier (i.e., successive versions of the same product <em class="bcp14">SHOULD</em> only differ in the product-version portion of the product value).
    2205       </p>
    2206       <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;<a id="header.field.definitions" href="#header.field.definitions">Header Field Definitions</a></h1>
    2207       <p id="rfc.section.9.p.1">This section defines the syntax and semantics of HTTP/1.1 header fields related to request and response semantics.</p>
     2203</pre><p id="rfc.section.7.2.p.5">Product tokens <em class="bcp14">SHOULD</em> be short and to the point. They <em class="bcp14">MUST NOT</em> be used for advertising or other non-essential information. Although any token octet <em class="bcp14">MAY</em> appear in a product-version, this token <em class="bcp14">SHOULD</em> only be used for a version identifier (i.e., successive versions of the same product <em class="bcp14">SHOULD</em> only differ in the product-version portion of the product value).
     2204      </p>
     2205      <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="header.field.definitions" href="#header.field.definitions">Header Field Definitions</a></h1>
     2206      <p id="rfc.section.8.p.1">This section defines the syntax and semantics of HTTP/1.1 header fields related to request and response semantics.</p>
    22082207      <div id="rfc.iref.a.1"></div>
    22092208      <div id="rfc.iref.h.2"></div>
    2210       <h2 id="rfc.section.9.1"><a href="#rfc.section.9.1">9.1</a>&nbsp;<a id="header.allow" href="#header.allow">Allow</a></h2>
    2211       <p id="rfc.section.9.1.p.1">The "Allow" header field lists the set of methods advertised as supported by the target resource. The purpose of this field
     2209      <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="header.allow" href="#header.allow">Allow</a></h2>
     2210      <p id="rfc.section.8.1.p.1">The "Allow" header field lists the set of methods advertised as supported by the target resource. The purpose of this field
    22122211         is strictly to inform the recipient of valid request methods associated with the resource.
    22132212      </p>
    22142213      <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.24"></span>  <a href="#header.allow" class="smpl">Allow</a> = #<a href="#method" class="smpl">method</a>
    2215 </pre><p id="rfc.section.9.1.p.3">Example of use:</p>
     2214</pre><p id="rfc.section.8.1.p.3">Example of use:</p>
    22162215      <div id="rfc.figure.u.19"></div><pre class="text">  Allow: GET, HEAD, PUT
    2217 </pre><p id="rfc.section.9.1.p.5">The actual set of allowed methods is defined by the origin server at the time of each request.</p>
    2218       <p id="rfc.section.9.1.p.6">A proxy <em class="bcp14">MUST NOT</em> modify the Allow header field — it does not need to understand all the methods specified in order to handle them according
     2216</pre><p id="rfc.section.8.1.p.5">The actual set of allowed methods is defined by the origin server at the time of each request.</p>
     2217      <p id="rfc.section.8.1.p.6">A proxy <em class="bcp14">MUST NOT</em> modify the Allow header field — it does not need to understand all the methods specified in order to handle them according
    22192218         to the generic message handling rules.
    22202219      </p>
    22212220      <div id="rfc.iref.d.2"></div>
    22222221      <div id="rfc.iref.h.3"></div>
    2223       <h2 id="rfc.section.9.2"><a href="#rfc.section.9.2">9.2</a>&nbsp;<a id="header.date" href="#header.date">Date</a></h2>
    2224       <p id="rfc.section.9.2.p.1">The "Date" header field represents the date and time at which the message was originated, having the same semantics as the
    2225          Origination Date Field (orig-date) defined in <a href="http://tools.ietf.org/html/rfc5322#section-3.6.1">Section 3.6.1</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.2"><cite title="Internet Message Format">[RFC5322]</cite></a>. The field value is an HTTP-date, as defined in <a href="#http.date" title="Date/Time Formats">Section&nbsp;8.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
     2222      <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a id="header.date" href="#header.date">Date</a></h2>
     2223      <p id="rfc.section.8.2.p.1">The "Date" header field represents the date and time at which the message was originated, having the same semantics as the
     2224         Origination Date Field (orig-date) defined in <a href="http://tools.ietf.org/html/rfc5322#section-3.6.1">Section 3.6.1</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.2"><cite title="Internet Message Format">[RFC5322]</cite></a>. The field value is an HTTP-date, as defined in <a href="#http.date" title="Date/Time Formats">Section&nbsp;7.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
    22262225      </p>
    22272226      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.25"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#http.date" class="smpl">HTTP-date</a>
    2228 </pre><p id="rfc.section.9.2.p.3">An example is</p>
     2227</pre><p id="rfc.section.8.2.p.3">An example is</p>
    22292228      <div id="rfc.figure.u.21"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
    2230 </pre><p id="rfc.section.9.2.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
     2229</pre><p id="rfc.section.8.2.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
    22312230      </p>
    22322231      <ol>
     
    22392238         </li>
    22402239      </ol>
    2241       <p id="rfc.section.9.2.p.6">A received message that does not have a Date header field <em class="bcp14">MUST</em> be assigned one by the recipient if the message will be cached by that recipient.
    2242       </p>
    2243       <p id="rfc.section.9.2.p.7">Clients can use the Date header field as well; in order to keep request messages small, they are advised not to include it
     2240      <p id="rfc.section.8.2.p.6">A received message that does not have a Date header field <em class="bcp14">MUST</em> be assigned one by the recipient if the message will be cached by that recipient.
     2241      </p>
     2242      <p id="rfc.section.8.2.p.7">Clients can use the Date header field as well; in order to keep request messages small, they are advised not to include it
    22442243         when it doesn't convey any useful information (as is usually the case for requests that do not contain a payload).
    22452244      </p>
    2246       <p id="rfc.section.9.2.p.8">The HTTP-date sent in a Date header field <em class="bcp14">SHOULD NOT</em> represent a date and time subsequent to the generation of the message. It <em class="bcp14">SHOULD</em> represent the best available approximation of the date and time of message generation, unless the implementation has no means
     2245      <p id="rfc.section.8.2.p.8">The HTTP-date sent in a Date header field <em class="bcp14">SHOULD NOT</em> represent a date and time subsequent to the generation of the message. It <em class="bcp14">SHOULD</em> represent the best available approximation of the date and time of message generation, unless the implementation has no means
    22472246         of generating a reasonably accurate date and time. In theory, the date ought to represent the moment just before the payload
    22482247         is generated. In practice, the date can be generated at any time during the message origination without affecting its semantic
     
    22512250      <div id="rfc.iref.e.1"></div>
    22522251      <div id="rfc.iref.h.4"></div>
    2253       <h2 id="rfc.section.9.3"><a href="#rfc.section.9.3">9.3</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
    2254       <p id="rfc.section.9.3.p.1">The "Expect" header field is used to indicate that particular server behaviors are required by the client.</p>
     2252      <h2 id="rfc.section.8.3"><a href="#rfc.section.8.3">8.3</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
     2253      <p id="rfc.section.8.3.p.1">The "Expect" header field is used to indicate that particular server behaviors are required by the client.</p>
    22552254      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.26"></span><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  <a href="#header.expect" class="smpl">Expect</a>       = 1#<a href="#header.expect" class="smpl">expectation</a>
    22562255 
     
    22612260  <a href="#header.expect" class="smpl">expect-name</a>  = <a href="#core.rules" class="smpl">token</a>
    22622261  <a href="#header.expect" class="smpl">expect-value</a> = <a href="#core.rules" class="smpl">token</a> / <a href="#core.rules" class="smpl">quoted-string</a>
    2263 </pre><p id="rfc.section.9.3.p.3">If all received Expect header field(s) are syntactically valid but contain an expectation that the recipient does not understand
     2262</pre><p id="rfc.section.8.3.p.3">If all received Expect header field(s) are syntactically valid but contain an expectation that the recipient does not understand
    22642263         or cannot comply with, the recipient <em class="bcp14">MUST</em> respond with a 417 (Expectation Failed) status code. A recipient of a syntactically invalid Expectation header field <em class="bcp14">MUST</em> respond with a 4xx status code other than 417.
    22652264      </p>
    2266       <p id="rfc.section.9.3.p.4">The only expectation defined by this specification is:</p>
    2267       <p id="rfc.section.9.3.p.5"><span id="rfc.iref.89"></span><span id="rfc.iref.e.2"></span> 100-continue
     2265      <p id="rfc.section.8.3.p.4">The only expectation defined by this specification is:</p>
     2266      <p id="rfc.section.8.3.p.5"><span id="rfc.iref.89"></span><span id="rfc.iref.e.2"></span> 100-continue
    22682267      </p>
    22692268      <ul class="empty">
     
    22712270         </li>
    22722271      </ul>
    2273       <p id="rfc.section.9.3.p.6">Comparison is case-insensitive for names (expect-name), and case-sensitive for values (expect-value).</p>
    2274       <p id="rfc.section.9.3.p.7">The Expect mechanism is hop-by-hop: the above requirements apply to any server, including proxies. However, the Expect header
     2272      <p id="rfc.section.8.3.p.6">Comparison is case-insensitive for names (expect-name), and case-sensitive for values (expect-value).</p>
     2273      <p id="rfc.section.8.3.p.7">The Expect mechanism is hop-by-hop: the above requirements apply to any server, including proxies. However, the Expect header
    22752274         field itself is end-to-end; it <em class="bcp14">MUST</em> be forwarded if the request is forwarded.
    22762275      </p>
    2277       <p id="rfc.section.9.3.p.8">Many older HTTP/1.0 and HTTP/1.1 applications do not understand the Expect header field.</p>
     2276      <p id="rfc.section.8.3.p.8">Many older HTTP/1.0 and HTTP/1.1 applications do not understand the Expect header field.</p>
    22782277      <div id="rfc.iref.f.1"></div>
    22792278      <div id="rfc.iref.h.5"></div>
    2280       <h2 id="rfc.section.9.4"><a href="#rfc.section.9.4">9.4</a>&nbsp;<a id="header.from" href="#header.from">From</a></h2>
    2281       <p id="rfc.section.9.4.p.1">The "From" header field, if given, <em class="bcp14">SHOULD</em> contain an Internet e-mail address for the human user who controls the requesting user agent. The address <em class="bcp14">SHOULD</em> be machine-usable, as defined by "mailbox" in <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.3"><cite title="Internet Message Format">[RFC5322]</cite></a>:
     2279      <h2 id="rfc.section.8.4"><a href="#rfc.section.8.4">8.4</a>&nbsp;<a id="header.from" href="#header.from">From</a></h2>
     2280      <p id="rfc.section.8.4.p.1">The "From" header field, if given, <em class="bcp14">SHOULD</em> contain an Internet e-mail address for the human user who controls the requesting user agent. The address <em class="bcp14">SHOULD</em> be machine-usable, as defined by "mailbox" in <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.3"><cite title="Internet Message Format">[RFC5322]</cite></a>:
    22822281      </p>
    22832282      <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  <a href="#header.from" class="smpl">From</a>    = <a href="#header.from" class="smpl">mailbox</a>
    22842283 
    22852284  <a href="#header.from" class="smpl">mailbox</a> = &lt;mailbox, defined in <a href="#RFC5322" id="rfc.xref.RFC5322.4"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a>&gt;
    2286 </pre><p id="rfc.section.9.4.p.3">An example is:</p>
     2285</pre><p id="rfc.section.8.4.p.3">An example is:</p>
    22872286      <div id="rfc.figure.u.24"></div><pre class="text">  From: webmaster@example.org
    2288 </pre><p id="rfc.section.9.4.p.5">This header field <em class="bcp14">MAY</em> be used for logging purposes and as a means for identifying the source of invalid or unwanted requests. It <em class="bcp14">SHOULD NOT</em> be used as an insecure form of access protection. The interpretation of this field is that the request is being performed
     2287</pre><p id="rfc.section.8.4.p.5">This header field <em class="bcp14">MAY</em> be used for logging purposes and as a means for identifying the source of invalid or unwanted requests. It <em class="bcp14">SHOULD NOT</em> be used as an insecure form of access protection. The interpretation of this field is that the request is being performed
    22892288         on behalf of the person given, who accepts responsibility for the method performed. In particular, robot agents <em class="bcp14">SHOULD</em> include this header field so that the person responsible for running the robot can be contacted if problems occur on the receiving
    22902289         end.
    22912290      </p>
    2292       <p id="rfc.section.9.4.p.6">The Internet e-mail address in this field <em class="bcp14">MAY</em> be separate from the Internet host which issued the request. For example, when a request is passed through a proxy the original
     2291      <p id="rfc.section.8.4.p.6">The Internet e-mail address in this field <em class="bcp14">MAY</em> be separate from the Internet host which issued the request. For example, when a request is passed through a proxy the original
    22932292         issuer's address <em class="bcp14">SHOULD</em> be used.
    22942293      </p>
    2295       <p id="rfc.section.9.4.p.7">The client <em class="bcp14">SHOULD NOT</em> send the From header field without the user's approval, as it might conflict with the user's privacy interests or their site's
     2294      <p id="rfc.section.8.4.p.7">The client <em class="bcp14">SHOULD NOT</em> send the From header field without the user's approval, as it might conflict with the user's privacy interests or their site's
    22962295         security policy. It is strongly recommended that the user be able to disable, enable, and modify the value of this field at
    22972296         any time prior to a request.
     
    22992298      <div id="rfc.iref.l.1"></div>
    23002299      <div id="rfc.iref.h.6"></div>
    2301       <h2 id="rfc.section.9.5"><a href="#rfc.section.9.5">9.5</a>&nbsp;<a id="header.location" href="#header.location">Location</a></h2>
    2302       <p id="rfc.section.9.5.p.1">The "Location" header field <em class="bcp14">MAY</em> be sent in responses to refer to a specific resource in accordance with the semantics of the status code.
     2300      <h2 id="rfc.section.8.5"><a href="#rfc.section.8.5">8.5</a>&nbsp;<a id="header.location" href="#header.location">Location</a></h2>
     2301      <p id="rfc.section.8.5.p.1">The "Location" header field <em class="bcp14">MAY</em> be sent in responses to refer to a specific resource in accordance with the semantics of the status code.
    23032302      </p>
    23042303      <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  <a href="#header.location" class="smpl">Location</a> = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
    2305 </pre><p id="rfc.section.9.5.p.3">For 201 (Created) responses, the Location is the URI of the new resource which was created by the request. For 3xx responses,
     2304</pre><p id="rfc.section.8.5.p.3">For 201 (Created) responses, the Location is the URI of the new resource which was created by the request. For 3xx responses,
    23062305         the location <em class="bcp14">SHOULD</em> indicate the server's preferred URI for automatic redirection to the resource.
    23072306      </p>
    2308       <p id="rfc.section.9.5.p.4">The field value consists of a single URI-reference. When it has the form of a relative reference (<a href="#RFC3986" id="rfc.xref.RFC3986.1"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-4.2">Section 4.2</a>), the final value is computed by resolving it against the effective request URI (<a href="#RFC3986" id="rfc.xref.RFC3986.2"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-5">Section 5</a>). If the original URI, as navigated to by the user agent, did contain a fragment identifier, and the final value does not,
     2307      <p id="rfc.section.8.5.p.4">The field value consists of a single URI-reference. When it has the form of a relative reference (<a href="#RFC3986" id="rfc.xref.RFC3986.1"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-4.2">Section 4.2</a>), the final value is computed by resolving it against the effective request URI (<a href="#RFC3986" id="rfc.xref.RFC3986.2"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-5">Section 5</a>). If the original URI, as navigated to by the user agent, did contain a fragment identifier, and the final value does not,
    23092308         then the original URI's fragment identifier is added to the final value.
    23102309      </p>
     
    23152314      <p>An original URI "http://www.example.org/index.html#larry", combined with a field value given as:</p>  <pre class="text">  Location: http://www.example.net/index.html
    23162315</pre>  <p>would result in a final value of "http://www.example.net/index.html#larry", preserving the original fragment identifier.</p>
    2317       <div class="note" id="rfc.section.9.5.p.7">
     2316      <div class="note" id="rfc.section.8.5.p.7">
    23182317         <p> <b>Note:</b> Some recipients attempt to recover from Location fields that are not valid URI references. This specification does not mandate
    23192318            or define such processing, but does allow it (see <a href="#intro.conformance.and.error.handling" title="Conformance and Error Handling">Section&nbsp;1.1</a>).
    23202319         </p>
    23212320      </div>
    2322       <p id="rfc.section.9.5.p.8">There are circumstances in which a fragment identifier in a Location URI would not be appropriate. For instance, when it appears
     2321      <p id="rfc.section.8.5.p.8">There are circumstances in which a fragment identifier in a Location URI would not be appropriate. For instance, when it appears
    23232322         in a 201 Created response, where the Location header field specifies the URI for the entire created resource.
    23242323      </p>
    2325       <div class="note" id="rfc.section.9.5.p.9">
     2324      <div class="note" id="rfc.section.8.5.p.9">
    23262325         <p> <b>Note:</b> The Content-Location header field (<a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.13"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) differs from Location in that the Content-Location identifies the most specific resource corresponding to the enclosed representation.
    23272326            It is therefore possible for a response to contain header fields for both Location and Content-Location.
     
    23302329      <div id="rfc.iref.m.9"></div>
    23312330      <div id="rfc.iref.h.7"></div>
    2332       <h2 id="rfc.section.9.6"><a href="#rfc.section.9.6">9.6</a>&nbsp;<a id="header.max-forwards" href="#header.max-forwards">Max-Forwards</a></h2>
    2333       <p id="rfc.section.9.6.p.1">The "Max-Forwards" header field provides a mechanism with the TRACE (<a href="#TRACE" id="rfc.xref.TRACE.2" title="TRACE">Section&nbsp;6.8</a>) and OPTIONS (<a href="#OPTIONS" id="rfc.xref.OPTIONS.2" title="OPTIONS">Section&nbsp;6.2</a>) methods to limit the number of times that the request is forwarded by proxies. This can be useful when the client is attempting
     2331      <h2 id="rfc.section.8.6"><a href="#rfc.section.8.6">8.6</a>&nbsp;<a id="header.max-forwards" href="#header.max-forwards">Max-Forwards</a></h2>
     2332      <p id="rfc.section.8.6.p.1">The "Max-Forwards" header field provides a mechanism with the TRACE (<a href="#TRACE" id="rfc.xref.TRACE.2" title="TRACE">Section&nbsp;6.8</a>) and OPTIONS (<a href="#OPTIONS" id="rfc.xref.OPTIONS.2" title="OPTIONS">Section&nbsp;6.2</a>) methods to limit the number of times that the request is forwarded by proxies. This can be useful when the client is attempting
    23342333         to trace a request which appears to be failing or looping mid-chain.
    23352334      </p>
    23362335      <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.33"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
    2337 </pre><p id="rfc.section.9.6.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
    2338       <p id="rfc.section.9.6.p.4">Each recipient of a TRACE or OPTIONS request containing a Max-Forwards header field <em class="bcp14">MUST</em> check and update its value prior to forwarding the request. If the received value is zero (0), the recipient <em class="bcp14">MUST NOT</em> forward the request; instead, it <em class="bcp14">MUST</em> respond as the final recipient. If the received Max-Forwards value is greater than zero, then the forwarded message <em class="bcp14">MUST</em> contain an updated Max-Forwards field with a value decremented by one (1).
    2339       </p>
    2340       <p id="rfc.section.9.6.p.5">The Max-Forwards header field <em class="bcp14">MAY</em> be ignored for all other request methods.
     2336</pre><p id="rfc.section.8.6.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
     2337      <p id="rfc.section.8.6.p.4">Each recipient of a TRACE or OPTIONS request containing a Max-Forwards header field <em class="bcp14">MUST</em> check and update its value prior to forwarding the request. If the received value is zero (0), the recipient <em class="bcp14">MUST NOT</em> forward the request; instead, it <em class="bcp14">MUST</em> respond as the final recipient. If the received Max-Forwards value is greater than zero, then the forwarded message <em class="bcp14">MUST</em> contain an updated Max-Forwards field with a value decremented by one (1).
     2338      </p>
     2339      <p id="rfc.section.8.6.p.5">The Max-Forwards header field <em class="bcp14">MAY</em> be ignored for all other request methods.
    23412340      </p>
    23422341      <div id="rfc.iref.r.1"></div>
    23432342      <div id="rfc.iref.h.8"></div>
    2344       <h2 id="rfc.section.9.7"><a href="#rfc.section.9.7">9.7</a>&nbsp;<a id="header.referer" href="#header.referer">Referer</a></h2>
    2345       <p id="rfc.section.9.7.p.1">The "Referer" [sic] header field allows the client to specify the URI of the resource from which the target URI was obtained
     2343      <h2 id="rfc.section.8.7"><a href="#rfc.section.8.7">8.7</a>&nbsp;<a id="header.referer" href="#header.referer">Referer</a></h2>
     2344      <p id="rfc.section.8.7.p.1">The "Referer" [sic] header field allows the client to specify the URI of the resource from which the target URI was obtained
    23462345         (the "referrer", although the header field is misspelled.).
    23472346      </p>
    2348       <p id="rfc.section.9.7.p.2">The Referer header field allows servers to generate lists of back-links to resources for interest, logging, optimized caching,
     2347      <p id="rfc.section.8.7.p.2">The Referer header field allows servers to generate lists of back-links to resources for interest, logging, optimized caching,
    23492348         etc. It also allows obsolete or mistyped links to be traced for maintenance. Some servers use Referer as a means of controlling
    23502349         where they allow links from (so-called "deep linking"), but legitimate requests do not always contain a Referer header field.
    23512350      </p>
    2352       <p id="rfc.section.9.7.p.3">If the target URI was obtained from a source that does not have its own URI (e.g., input from the user keyboard), the Referer
     2351      <p id="rfc.section.8.7.p.3">If the target URI was obtained from a source that does not have its own URI (e.g., input from the user keyboard), the Referer
    23532352         field <em class="bcp14">MUST</em> either be sent with the value "about:blank", or not be sent at all. Note that this requirement does not apply to sources with
    23542353         non-HTTP URIs (e.g., FTP).
    23552354      </p>
    23562355      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.34"></span>  <a href="#header.referer" class="smpl">Referer</a> = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
    2357 </pre><p id="rfc.section.9.7.p.5">Example:</p>
     2356</pre><p id="rfc.section.8.7.p.5">Example:</p>
    23582357      <div id="rfc.figure.u.30"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
    2359 </pre><p id="rfc.section.9.7.p.7">If the field value is a relative URI, it <em class="bcp14">SHOULD</em> be interpreted relative to the effective request URI. The URI <em class="bcp14">MUST NOT</em> include a fragment. See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;11.2</a> for security considerations.
     2358</pre><p id="rfc.section.8.7.p.7">If the field value is a relative URI, it <em class="bcp14">SHOULD</em> be interpreted relative to the effective request URI. The URI <em class="bcp14">MUST NOT</em> include a fragment. See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;10.2</a> for security considerations.
    23602359      </p>
    23612360      <div id="rfc.iref.r.2"></div>
    23622361      <div id="rfc.iref.h.9"></div>
    2363       <h2 id="rfc.section.9.8"><a href="#rfc.section.9.8">9.8</a>&nbsp;<a id="header.retry-after" href="#header.retry-after">Retry-After</a></h2>
    2364       <p id="rfc.section.9.8.p.1">The header "Retry-After" field can be used with a 503 (Service Unavailable) response to indicate how long the service is expected
     2362      <h2 id="rfc.section.8.8"><a href="#rfc.section.8.8">8.8</a>&nbsp;<a id="header.retry-after" href="#header.retry-after">Retry-After</a></h2>
     2363      <p id="rfc.section.8.8.p.1">The header "Retry-After" field can be used with a 503 (Service Unavailable) response to indicate how long the service is expected
    23652364         to be unavailable to the requesting client. This field <em class="bcp14">MAY</em> also be used with any 3xx (Redirection) response to indicate the minimum time the user-agent is asked to wait before issuing
    23662365         the redirected request.
    23672366      </p>
    2368       <p id="rfc.section.9.8.p.2">The value of this field can be either an HTTP-date or an integer number of seconds (in decimal) after the time of the response.</p>
     2367      <p id="rfc.section.8.8.p.2">The value of this field can be either an HTTP-date or an integer number of seconds (in decimal) after the time of the response.</p>
    23692368      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.35"></span>  <a href="#header.retry-after" class="smpl">Retry-After</a> = <a href="#http.date" class="smpl">HTTP-date</a> / <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>
    23702369</pre><div id="rule.delta-seconds">
    2371          <p id="rfc.section.9.8.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
     2370         <p id="rfc.section.8.8.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
    23722371      </div>
    23732372      <div id="rfc.figure.u.32"></div><pre class="inline"><span id="rfc.iref.g.36"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
    2374 </pre><p id="rfc.section.9.8.p.6">Two examples of its use are</p>
     2373</pre><p id="rfc.section.8.8.p.6">Two examples of its use are</p>
    23752374      <div id="rfc.figure.u.33"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
    23762375  Retry-After: 120
    2377 </pre><p id="rfc.section.9.8.p.8">In the latter example, the delay is 2 minutes.</p>
     2376</pre><p id="rfc.section.8.8.p.8">In the latter example, the delay is 2 minutes.</p>
    23782377      <div id="rfc.iref.s.38"></div>
    23792378      <div id="rfc.iref.h.10"></div>
    2380       <h2 id="rfc.section.9.9"><a href="#rfc.section.9.9">9.9</a>&nbsp;<a id="header.server" href="#header.server">Server</a></h2>
    2381       <p id="rfc.section.9.9.p.1">The "Server" header field contains information about the software used by the origin server to handle the request.</p>
    2382       <p id="rfc.section.9.9.p.2">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;8.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.39"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) identifying the server and any significant subproducts. The product tokens are listed in order of their significance for
     2379      <h2 id="rfc.section.8.9"><a href="#rfc.section.8.9">8.9</a>&nbsp;<a id="header.server" href="#header.server">Server</a></h2>
     2380      <p id="rfc.section.8.9.p.1">The "Server" header field contains information about the software used by the origin server to handle the request.</p>
     2381      <p id="rfc.section.8.9.p.2">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;7.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.39"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) identifying the server and any significant subproducts. The product tokens are listed in order of their significance for
    23832382         identifying the application.
    23842383      </p>
    23852384      <div id="rfc.figure.u.34"></div><pre class="inline"><span id="rfc.iref.g.37"></span>  <a href="#header.server" class="smpl">Server</a> = <a href="#product.tokens" class="smpl">product</a> *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#product.tokens" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    2386 </pre><p id="rfc.section.9.9.p.4">Example:</p>
     2385</pre><p id="rfc.section.8.9.p.4">Example:</p>
    23872386      <div id="rfc.figure.u.35"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
    2388 </pre><p id="rfc.section.9.9.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server header field. Instead, it <em class="bcp14">MUST</em> include a Via field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.40"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    2389       </p>
    2390       <div class="note" id="rfc.section.9.9.p.7">
     2387</pre><p id="rfc.section.8.9.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server header field. Instead, it <em class="bcp14">MUST</em> include a Via field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.40"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     2388      </p>
     2389      <div class="note" id="rfc.section.8.9.p.7">
    23912390         <p> <b>Note:</b> Revealing the specific software version of the server might allow the server machine to become more vulnerable to attacks
    23922391            against software that is known to contain security holes. Server implementors are encouraged to make this field a configurable
     
    23962395      <div id="rfc.iref.u.1"></div>
    23972396      <div id="rfc.iref.h.11"></div>
    2398       <h2 id="rfc.section.9.10"><a href="#rfc.section.9.10">9.10</a>&nbsp;<a id="header.user-agent" href="#header.user-agent">User-Agent</a></h2>
    2399       <p id="rfc.section.9.10.p.1">The "User-Agent" header field contains information about the user agent originating the request. User agents <em class="bcp14">SHOULD</em> include this field with requests.
    2400       </p>
    2401       <p id="rfc.section.9.10.p.2">Typically, it is used for statistical purposes, the tracing of protocol violations, and tailoring responses to avoid particular
     2397      <h2 id="rfc.section.8.10"><a href="#rfc.section.8.10">8.10</a>&nbsp;<a id="header.user-agent" href="#header.user-agent">User-Agent</a></h2>
     2398      <p id="rfc.section.8.10.p.1">The "User-Agent" header field contains information about the user agent originating the request. User agents <em class="bcp14">SHOULD</em> include this field with requests.
     2399      </p>
     2400      <p id="rfc.section.8.10.p.2">Typically, it is used for statistical purposes, the tracing of protocol violations, and tailoring responses to avoid particular
    24022401         user agent limitations.
    24032402      </p>
    2404       <p id="rfc.section.9.10.p.3">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;8.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.41"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) identifying the agent and its significant subproducts. By convention, the product tokens are listed in order of their significance
     2403      <p id="rfc.section.8.10.p.3">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;7.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.41"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) identifying the agent and its significant subproducts. By convention, the product tokens are listed in order of their significance
    24052404         for identifying the application.
    24062405      </p>
    2407       <p id="rfc.section.9.10.p.4">Because this field is usually sent on every request a user agent makes, implementations are encouraged not to include needlessly
     2406      <p id="rfc.section.8.10.p.4">Because this field is usually sent on every request a user agent makes, implementations are encouraged not to include needlessly
    24082407         fine-grained detail, and to limit (or even prohibit) the addition of subproducts by third parties. Overly long and detailed
    24092408         User-Agent field values make requests larger and can also be used to identify ("fingerprint") the user against their wishes.
    24102409      </p>
    2411       <p id="rfc.section.9.10.p.5">Likewise, implementations are encouraged not to use the product tokens of other implementations in order to declare compatibility
     2410      <p id="rfc.section.8.10.p.5">Likewise, implementations are encouraged not to use the product tokens of other implementations in order to declare compatibility
    24122411         with them, as this circumvents the purpose of the field. Finally, they are encouraged not to use comments to identify products;
    24132412         doing so makes the field value more difficult to parse.
    24142413      </p>
    24152414      <div id="rfc.figure.u.36"></div><pre class="inline"><span id="rfc.iref.g.38"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a> = <a href="#product.tokens" class="smpl">product</a> *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#product.tokens" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    2416 </pre><p id="rfc.section.9.10.p.7">Example:</p>
     2415</pre><p id="rfc.section.8.10.p.7">Example:</p>
    24172416      <div id="rfc.figure.u.37"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    2418 </pre><h1 id="rfc.section.10"><a href="#rfc.section.10">10.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
    2419       <h2 id="rfc.section.10.1"><a href="#rfc.section.10.1">10.1</a>&nbsp;<a id="method.registration" href="#method.registration">Method Registry</a></h2>
    2420       <p id="rfc.section.10.1.p.1">The registration procedure for HTTP request methods is defined by <a href="#method.registry" title="Method Registry">Section&nbsp;2.2</a> of this document.
    2421       </p>
    2422       <p id="rfc.section.10.1.p.2">The HTTP Method Registry shall be created at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt; and be populated with the registrations below:
     2417</pre><h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
     2418      <h2 id="rfc.section.9.1"><a href="#rfc.section.9.1">9.1</a>&nbsp;<a id="method.registration" href="#method.registration">Method Registry</a></h2>
     2419      <p id="rfc.section.9.1.p.1">The registration procedure for HTTP request methods is defined by <a href="#method.registry" title="Method Registry">Section&nbsp;2.2</a> of this document.
     2420      </p>
     2421      <p id="rfc.section.9.1.p.2">The HTTP Method Registry shall be created at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt; and be populated with the registrations below:
    24232422      </p>
    24242423      <div id="rfc.table.1">
     
    24842483         </table>
    24852484      </div>
    2486       <h2 id="rfc.section.10.2"><a href="#rfc.section.10.2">10.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registry</a></h2>
    2487       <p id="rfc.section.10.2.p.1">The registration procedure for HTTP Status Codes — previously defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.1"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a> — is now defined by <a href="#status.code.registry" title="Status Code Registry">Section&nbsp;4.2</a> of this document.
    2488       </p>
    2489       <p id="rfc.section.10.2.p.2">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
     2485      <h2 id="rfc.section.9.2"><a href="#rfc.section.9.2">9.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registry</a></h2>
     2486      <p id="rfc.section.9.2.p.1">The registration procedure for HTTP Status Codes — previously defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.1"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a> — is now defined by <a href="#status.code.registry" title="Status Code Registry">Section&nbsp;4.2</a> of this document.
     2487      </p>
     2488      <p id="rfc.section.9.2.p.2">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
    24902489      </p>
    24912490      <div id="rfc.table.2">
     
    25032502                  <td class="left">100</td>
    25042503                  <td class="left">Continue</td>
    2505                   <td class="left"> <a href="#status.100" id="rfc.xref.status.100.2" title="100 Continue">Section&nbsp;7.1.1</a>
     2504                  <td class="left"> <a href="#status.100" id="rfc.xref.status.100.2" title="100 Continue">Section&nbsp;4.3.1.1</a>
    25062505                  </td>
    25072506               </tr>
     
    25092508                  <td class="left">101</td>
    25102509                  <td class="left">Switching Protocols</td>
    2511                   <td class="left"> <a href="#status.101" id="rfc.xref.status.101.2" title="101 Switching Protocols">Section&nbsp;7.1.2</a>
     2510                  <td class="left"> <a href="#status.101" id="rfc.xref.status.101.2" title="101 Switching Protocols">Section&nbsp;4.3.1.2</a>
    25122511                  </td>
    25132512               </tr>
     
    25152514                  <td class="left">200</td>
    25162515                  <td class="left">OK</td>
    2517                   <td class="left"> <a href="#status.200" id="rfc.xref.status.200.2" title="200 OK">Section&nbsp;7.2.1</a>
     2516                  <td class="left"> <a href="#status.200" id="rfc.xref.status.200.2" title="200 OK">Section&nbsp;4.3.2.1</a>
    25182517                  </td>
    25192518               </tr>
     
    25212520                  <td class="left">201</td>
    25222521                  <td class="left">Created</td>
    2523                   <td class="left"> <a href="#status.201" id="rfc.xref.status.201.2" title="201 Created">Section&nbsp;7.2.2</a>
     2522                  <td class="left"> <a href="#status.201" id="rfc.xref.status.201.2" title="201 Created">Section&nbsp;4.3.2.2</a>
    25242523                  </td>
    25252524               </tr>
     
    25272526                  <td class="left">202</td>
    25282527                  <td class="left">Accepted</td>
    2529                   <td class="left"> <a href="#status.202" id="rfc.xref.status.202.2" title="202 Accepted">Section&nbsp;7.2.3</a>
     2528                  <td class="left"> <a href="#status.202" id="rfc.xref.status.202.2" title="202 Accepted">Section&nbsp;4.3.2.3</a>
    25302529                  </td>
    25312530               </tr>
     
    25332532                  <td class="left">203</td>
    25342533                  <td class="left">Non-Authoritative Information</td>
    2535                   <td class="left"> <a href="#status.203" id="rfc.xref.status.203.2" title="203 Non-Authoritative Information">Section&nbsp;7.2.4</a>
     2534                  <td class="left"> <a href="#status.203" id="rfc.xref.status.203.2" title="203 Non-Authoritative Information">Section&nbsp;4.3.2.4</a>
    25362535                  </td>
    25372536               </tr>
     
    25392538                  <td class="left">204</td>
    25402539                  <td class="left">No Content</td>
    2541                   <td class="left"> <a href="#status.204" id="rfc.xref.status.204.2" title="204 No Content">Section&nbsp;7.2.5</a>
     2540                  <td class="left"> <a href="#status.204" id="rfc.xref.status.204.2" title="204 No Content">Section&nbsp;4.3.2.5</a>
    25422541                  </td>
    25432542               </tr>
     
    25452544                  <td class="left">205</td>
    25462545                  <td class="left">Reset Content</td>
    2547                   <td class="left"> <a href="#status.205" id="rfc.xref.status.205.2" title="205 Reset Content">Section&nbsp;7.2.6</a>
     2546                  <td class="left"> <a href="#status.205" id="rfc.xref.status.205.2" title="205 Reset Content">Section&nbsp;4.3.2.6</a>
    25482547                  </td>
    25492548               </tr>
     
    25512550                  <td class="left">300</td>
    25522551                  <td class="left">Multiple Choices</td>
    2553                   <td class="left"> <a href="#status.300" id="rfc.xref.status.300.2" title="300 Multiple Choices">Section&nbsp;7.3.1</a>
     2552                  <td class="left"> <a href="#status.300" id="rfc.xref.status.300.2" title="300 Multiple Choices">Section&nbsp;4.3.3.1</a>
    25542553                  </td>
    25552554               </tr>
     
    25572556                  <td class="left">301</td>
    25582557                  <td class="left">Moved Permanently</td>
    2559                   <td class="left"> <a href="#status.301" id="rfc.xref.status.301.2" title="301 Moved Permanently">Section&nbsp;7.3.2</a>
     2558                  <td class="left"> <a href="#status.301" id="rfc.xref.status.301.2" title="301 Moved Permanently">Section&nbsp;4.3.3.2</a>
    25602559                  </td>
    25612560               </tr>
     
    25632562                  <td class="left">302</td>
    25642563                  <td class="left">Found</td>
    2565                   <td class="left"> <a href="#status.302" id="rfc.xref.status.302.2" title="302 Found">Section&nbsp;7.3.3</a>
     2564                  <td class="left"> <a href="#status.302" id="rfc.xref.status.302.2" title="302 Found">Section&nbsp;4.3.3.3</a>
    25662565                  </td>
    25672566               </tr>
     
    25692568                  <td class="left">303</td>
    25702569                  <td class="left">See Other</td>
    2571                   <td class="left"> <a href="#status.303" id="rfc.xref.status.303.2" title="303 See Other">Section&nbsp;7.3.4</a>
     2570                  <td class="left"> <a href="#status.303" id="rfc.xref.status.303.2" title="303 See Other">Section&nbsp;4.3.3.4</a>
    25722571                  </td>
    25732572               </tr>
     
    25752574                  <td class="left">305</td>
    25762575                  <td class="left">Use Proxy</td>
    2577                   <td class="left"> <a href="#status.305" id="rfc.xref.status.305.2" title="305 Use Proxy">Section&nbsp;7.3.5</a>
     2576                  <td class="left"> <a href="#status.305" id="rfc.xref.status.305.2" title="305 Use Proxy">Section&nbsp;4.3.3.5</a>
    25782577                  </td>
    25792578               </tr>
     
    25812580                  <td class="left">306</td>
    25822581                  <td class="left">(Unused)</td>
    2583                   <td class="left"> <a href="#status.306" id="rfc.xref.status.306.1" title="306 (Unused)">Section&nbsp;7.3.6</a>
     2582                  <td class="left"> <a href="#status.306" id="rfc.xref.status.306.1" title="306 (Unused)">Section&nbsp;4.3.3.6</a>
    25842583                  </td>
    25852584               </tr>
     
    25872586                  <td class="left">307</td>
    25882587                  <td class="left">Temporary Redirect</td>
    2589                   <td class="left"> <a href="#status.307" id="rfc.xref.status.307.2" title="307 Temporary Redirect">Section&nbsp;7.3.7</a>
     2588                  <td class="left"> <a href="#status.307" id="rfc.xref.status.307.2" title="307 Temporary Redirect">Section&nbsp;4.3.3.7</a>
    25902589                  </td>
    25912590               </tr>
     
    25932592                  <td class="left">400</td>
    25942593                  <td class="left">Bad Request</td>
    2595                   <td class="left"> <a href="#status.400" id="rfc.xref.status.400.2" title="400 Bad Request">Section&nbsp;7.4.1</a>
     2594                  <td class="left"> <a href="#status.400" id="rfc.xref.status.400.2" title="400 Bad Request">Section&nbsp;4.3.4.1</a>
    25962595                  </td>
    25972596               </tr>
     
    25992598                  <td class="left">402</td>
    26002599                  <td class="left">Payment Required</td>
    2601                   <td class="left"> <a href="#status.402" id="rfc.xref.status.402.2" title="402 Payment Required">Section&nbsp;7.4.2</a>
     2600                  <td class="left"> <a href="#status.402" id="rfc.xref.status.402.2" title="402 Payment Required">Section&nbsp;4.3.4.2</a>
    26022601                  </td>
    26032602               </tr>
     
    26052604                  <td class="left">403</td>
    26062605                  <td class="left">Forbidden</td>
    2607                   <td class="left"> <a href="#status.403" id="rfc.xref.status.403.2" title="403 Forbidden">Section&nbsp;7.4.3</a>
     2606                  <td class="left"> <a href="#status.403" id="rfc.xref.status.403.2" title="403 Forbidden">Section&nbsp;4.3.4.3</a>
    26082607                  </td>
    26092608               </tr>
     
    26112610                  <td class="left">404</td>
    26122611                  <td class="left">Not Found</td>
    2613                   <td class="left"> <a href="#status.404" id="rfc.xref.status.404.2" title="404 Not Found">Section&nbsp;7.4.4</a>
     2612                  <td class="left"> <a href="#status.404" id="rfc.xref.status.404.2" title="404 Not Found">Section&nbsp;4.3.4.4</a>
    26142613                  </td>
    26152614               </tr>
     
    26172616                  <td class="left">405</td>
    26182617                  <td class="left">Method Not Allowed</td>
    2619                   <td class="left"> <a href="#status.405" id="rfc.xref.status.405.2" title="405 Method Not Allowed">Section&nbsp;7.4.5</a>
     2618                  <td class="left"> <a href="#status.405" id="rfc.xref.status.405.2" title="405 Method Not Allowed">Section&nbsp;4.3.4.5</a>
    26202619                  </td>
    26212620               </tr>
     
    26232622                  <td class="left">406</td>
    26242623                  <td class="left">Not Acceptable</td>
    2625                   <td class="left"> <a href="#status.406" id="rfc.xref.status.406.2" title="406 Not Acceptable">Section&nbsp;7.4.6</a>
     2624                  <td class="left"> <a href="#status.406" id="rfc.xref.status.406.2" title="406 Not Acceptable">Section&nbsp;4.3.4.6</a>
    26262625                  </td>
    26272626               </tr>
     
    26292628                  <td class="left">408</td>
    26302629                  <td class="left">Request Timeout</td>
    2631                   <td class="left"> <a href="#status.408" id="rfc.xref.status.408.2" title="408 Request Timeout">Section&nbsp;7.4.7</a>
     2630                  <td class="left"> <a href="#status.408" id="rfc.xref.status.408.2" title="408 Request Timeout">Section&nbsp;4.3.4.7</a>
    26322631                  </td>
    26332632               </tr>
     
    26352634                  <td class="left">409</td>
    26362635                  <td class="left">Conflict</td>
    2637                   <td class="left"> <a href="#status.409" id="rfc.xref.status.409.2" title="409 Conflict">Section&nbsp;7.4.8</a>
     2636                  <td class="left"> <a href="#status.409" id="rfc.xref.status.409.2" title="409 Conflict">Section&nbsp;4.3.4.8</a>
    26382637                  </td>
    26392638               </tr>
     
    26412640                  <td class="left">410</td>
    26422641                  <td class="left">Gone</td>
    2643                   <td class="left"> <a href="#status.410" id="rfc.xref.status.410.2" title="410 Gone">Section&nbsp;7.4.9</a>
     2642                  <td class="left"> <a href="#status.410" id="rfc.xref.status.410.2" title="410 Gone">Section&nbsp;4.3.4.9</a>
    26442643                  </td>
    26452644               </tr>
     
    26472646                  <td class="left">411</td>
    26482647                  <td class="left">Length Required</td>
    2649                   <td class="left"> <a href="#status.411" id="rfc.xref.status.411.2" title="411 Length Required">Section&nbsp;7.4.10</a>
     2648                  <td class="left"> <a href="#status.411" id="rfc.xref.status.411.2" title="411 Length Required">Section&nbsp;4.3.4.10</a>
    26502649                  </td>
    26512650               </tr>
     
    26532652                  <td class="left">413</td>
    26542653                  <td class="left">Request Representation Too Large</td>
    2655                   <td class="left"> <a href="#status.413" id="rfc.xref.status.413.2" title="413 Request Representation Too Large">Section&nbsp;7.4.11</a>
     2654                  <td class="left"> <a href="#status.413" id="rfc.xref.status.413.2" title="413 Request Representation Too Large">Section&nbsp;4.3.4.11</a>
    26562655                  </td>
    26572656               </tr>
     
    26592658                  <td class="left">414</td>
    26602659                  <td class="left">URI Too Long</td>
    2661                   <td class="left"> <a href="#status.414" id="rfc.xref.status.414.2" title="414 URI Too Long">Section&nbsp;7.4.12</a>
     2660                  <td class="left"> <a href="#status.414" id="rfc.xref.status.414.2" title="414 URI Too Long">Section&nbsp;4.3.4.12</a>
    26622661                  </td>
    26632662               </tr>
     
    26652664                  <td class="left">415</td>
    26662665                  <td class="left">Unsupported Media Type</td>
    2667                   <td class="left"> <a href="#status.415" id="rfc.xref.status.415.2" title="415 Unsupported Media Type">Section&nbsp;7.4.13</a>
     2666                  <td class="left"> <a href="#status.415" id="rfc.xref.status.415.2" title="415 Unsupported Media Type">Section&nbsp;4.3.4.13</a>
    26682667                  </td>
    26692668               </tr>
     
    26712670                  <td class="left">417</td>
    26722671                  <td class="left">Expectation Failed</td>
    2673                   <td class="left"> <a href="#status.417" id="rfc.xref.status.417.2" title="417 Expectation Failed">Section&nbsp;7.4.14</a>
     2672                  <td class="left"> <a href="#status.417" id="rfc.xref.status.417.2" title="417 Expectation Failed">Section&nbsp;4.3.4.14</a>
    26742673                  </td>
    26752674               </tr>
     
    26772676                  <td class="left">426</td>
    26782677                  <td class="left">Upgrade Required</td>
    2679                   <td class="left"> <a href="#status.426" id="rfc.xref.status.426.2" title="426 Upgrade Required">Section&nbsp;7.4.15</a>
     2678                  <td class="left"> <a href="#status.426" id="rfc.xref.status.426.2" title="426 Upgrade Required">Section&nbsp;4.3.4.15</a>
    26802679                  </td>
    26812680               </tr>
     
    26832682                  <td class="left">500</td>
    26842683                  <td class="left">Internal Server Error</td>
    2685                   <td class="left"> <a href="#status.500" id="rfc.xref.status.500.2" title="500 Internal Server Error">Section&nbsp;7.5.1</a>
     2684                  <td class="left"> <a href="#status.500" id="rfc.xref.status.500.2" title="500 Internal Server Error">Section&nbsp;4.3.5.1</a>
    26862685                  </td>
    26872686               </tr>
     
    26892688                  <td class="left">501</td>
    26902689                  <td class="left">Not Implemented</td>
    2691                   <td class="left"> <a href="#status.501" id="rfc.xref.status.501.2" title="501 Not Implemented">Section&nbsp;7.5.2</a>
     2690                  <td class="left"> <a href="#status.501" id="rfc.xref.status.501.2" title="501 Not Implemented">Section&nbsp;4.3.5.2</a>
    26922691                  </td>
    26932692               </tr>
     
    26952694                  <td class="left">502</td>
    26962695                  <td class="left">Bad Gateway</td>
    2697                   <td class="left"> <a href="#status.502" id="rfc.xref.status.502.2" title="502 Bad Gateway">Section&nbsp;7.5.3</a>
     2696                  <td class="left"> <a href="#status.502" id="rfc.xref.status.502.2" title="502 Bad Gateway">Section&nbsp;4.3.5.3</a>
    26982697                  </td>
    26992698               </tr>
     
    27012700                  <td class="left">503</td>
    27022701                  <td class="left">Service Unavailable</td>
    2703                   <td class="left"> <a href="#status.503" id="rfc.xref.status.503.2" title="503 Service Unavailable">Section&nbsp;7.5.4</a>
     2702                  <td class="left"> <a href="#status.503" id="rfc.xref.status.503.2" title="503 Service Unavailable">Section&nbsp;4.3.5.4</a>
    27042703                  </td>
    27052704               </tr>
     
    27072706                  <td class="left">504</td>
    27082707                  <td class="left">Gateway Timeout</td>
    2709                   <td class="left"> <a href="#status.504" id="rfc.xref.status.504.2" title="504 Gateway Timeout">Section&nbsp;7.5.5</a>
     2708                  <td class="left"> <a href="#status.504" id="rfc.xref.status.504.2" title="504 Gateway Timeout">Section&nbsp;4.3.5.5</a>
    27102709                  </td>
    27112710               </tr>
     
    27132712                  <td class="left">505</td>
    27142713                  <td class="left">HTTP Version Not Supported</td>
    2715                   <td class="left"> <a href="#status.505" id="rfc.xref.status.505.2" title="505 HTTP Version Not Supported">Section&nbsp;7.5.6</a>
     2714                  <td class="left"> <a href="#status.505" id="rfc.xref.status.505.2" title="505 HTTP Version Not Supported">Section&nbsp;4.3.5.6</a>
    27162715                  </td>
    27172716               </tr>
     
    27192718         </table>
    27202719      </div>
    2721       <h2 id="rfc.section.10.3"><a href="#rfc.section.10.3">10.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
    2722       <p id="rfc.section.10.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#RFC3864" id="rfc.xref.RFC3864.3"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>):
     2720      <h2 id="rfc.section.9.3"><a href="#rfc.section.9.3">9.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
     2721      <p id="rfc.section.9.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#RFC3864" id="rfc.xref.RFC3864.3"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>):
    27232722      </p>
    27242723      <div id="rfc.table.3">
     
    27382737                  <td class="left">http</td>
    27392738                  <td class="left">standard</td>
    2740                   <td class="left"> <a href="#header.allow" id="rfc.xref.header.allow.3" title="Allow">Section&nbsp;9.1</a>
     2739                  <td class="left"> <a href="#header.allow" id="rfc.xref.header.allow.3" title="Allow">Section&nbsp;8.1</a>
    27412740                  </td>
    27422741               </tr>
     
    27452744                  <td class="left">http</td>
    27462745                  <td class="left">standard</td>
    2747                   <td class="left"> <a href="#header.date" id="rfc.xref.header.date.2" title="Date">Section&nbsp;9.2</a>
     2746                  <td class="left"> <a href="#header.date" id="rfc.xref.header.date.2" title="Date">Section&nbsp;8.2</a>
    27482747                  </td>
    27492748               </tr>
     
    27522751                  <td class="left">http</td>
    27532752                  <td class="left">standard</td>
    2754                   <td class="left"> <a href="#header.expect" id="rfc.xref.header.expect.3" title="Expect">Section&nbsp;9.3</a>
     2753                  <td class="left"> <a href="#header.expect" id="rfc.xref.header.expect.3" title="Expect">Section&nbsp;8.3</a>
    27552754                  </td>
    27562755               </tr>
     
    27592758                  <td class="left">http</td>
    27602759                  <td class="left">standard</td>
    2761                   <td class="left"> <a href="#header.from" id="rfc.xref.header.from.2" title="From">Section&nbsp;9.4</a>
     2760                  <td class="left"> <a href="#header.from" id="rfc.xref.header.from.2" title="From">Section&nbsp;8.4</a>
    27622761                  </td>
    27632762               </tr>
     
    27662765                  <td class="left">http</td>
    27672766                  <td class="left">standard</td>
    2768                   <td class="left"> <a href="#header.location" id="rfc.xref.header.location.4" title="Location">Section&nbsp;9.5</a>
     2767                  <td class="left"> <a href="#header.location" id="rfc.xref.header.location.4" title="Location">Section&nbsp;8.5</a>
    27692768                  </td>
    27702769               </tr>
     
    27732772                  <td class="left">http</td>
    27742773                  <td class="left">standard</td>
    2775                   <td class="left"> <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.4" title="Max-Forwards">Section&nbsp;9.6</a>
     2774                  <td class="left"> <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.4" title="Max-Forwards">Section&nbsp;8.6</a>
    27762775                  </td>
    27772776               </tr>
     
    27802779                  <td class="left">http</td>
    27812780                  <td class="left">standard</td>
    2782                   <td class="left"> <a href="#header.referer" id="rfc.xref.header.referer.2" title="Referer">Section&nbsp;9.7</a>
     2781                  <td class="left"> <a href="#header.referer" id="rfc.xref.header.referer.2" title="Referer">Section&nbsp;8.7</a>
    27832782                  </td>
    27842783               </tr>
     
    27872786                  <td class="left">http</td>
    27882787                  <td class="left">standard</td>
    2789                   <td class="left"> <a href="#header.retry-after" id="rfc.xref.header.retry-after.3" title="Retry-After">Section&nbsp;9.8</a>
     2788                  <td class="left"> <a href="#header.retry-after" id="rfc.xref.header.retry-after.3" title="Retry-After">Section&nbsp;8.8</a>
    27902789                  </td>
    27912790               </tr>
     
    27942793                  <td class="left">http</td>
    27952794                  <td class="left">standard</td>
    2796                   <td class="left"> <a href="#header.server" id="rfc.xref.header.server.2" title="Server">Section&nbsp;9.9</a>
     2795                  <td class="left"> <a href="#header.server" id="rfc.xref.header.server.2" title="Server">Section&nbsp;8.9</a>
    27972796                  </td>
    27982797               </tr>
     
    28012800                  <td class="left">http</td>
    28022801                  <td class="left">standard</td>
    2803                   <td class="left"> <a href="#header.user-agent" id="rfc.xref.header.user-agent.2" title="User-Agent">Section&nbsp;9.10</a>
     2802                  <td class="left"> <a href="#header.user-agent" id="rfc.xref.header.user-agent.2" title="User-Agent">Section&nbsp;8.10</a>
    28042803                  </td>
    28052804               </tr>
     
    28072806         </table>
    28082807      </div>
    2809       <p id="rfc.section.10.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
    2810       <h1 id="rfc.section.11"><a href="#rfc.section.11">11.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
    2811       <p id="rfc.section.11.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
     2808      <p id="rfc.section.9.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
     2809      <h1 id="rfc.section.10"><a href="#rfc.section.10">10.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
     2810      <p id="rfc.section.10.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
    28122811         as described by this document. The discussion does not include definitive solutions to the problems revealed, though it does
    28132812         make some suggestions for reducing security risks.
    28142813      </p>
    2815       <h2 id="rfc.section.11.1"><a href="#rfc.section.11.1">11.1</a>&nbsp;<a id="security.sensitive" href="#security.sensitive">Transfer of Sensitive Information</a></h2>
    2816       <p id="rfc.section.11.1.p.1">Like any generic data transfer protocol, HTTP cannot regulate the content of the data that is transferred, nor is there any
     2814      <h2 id="rfc.section.10.1"><a href="#rfc.section.10.1">10.1</a>&nbsp;<a id="security.sensitive" href="#security.sensitive">Transfer of Sensitive Information</a></h2>
     2815      <p id="rfc.section.10.1.p.1">Like any generic data transfer protocol, HTTP cannot regulate the content of the data that is transferred, nor is there any
    28172816         a priori method of determining the sensitivity of any particular piece of information within the context of any given request.
    28182817         Therefore, applications <em class="bcp14">SHOULD</em> supply as much control over this information as possible to the provider of that information. Four header fields are worth
    28192818         special mention in this context: Server, Via, Referer and From.
    28202819      </p>
    2821       <p id="rfc.section.11.1.p.2">Revealing the specific software version of the server might allow the server machine to become more vulnerable to attacks
     2820      <p id="rfc.section.10.1.p.2">Revealing the specific software version of the server might allow the server machine to become more vulnerable to attacks
    28222821         against software that is known to contain security holes. Implementors <em class="bcp14">SHOULD</em> make the Server header field a configurable option.
    28232822      </p>
    2824       <p id="rfc.section.11.1.p.3">Proxies which serve as a portal through a network firewall <em class="bcp14">SHOULD</em> take special precautions regarding the transfer of header information that identifies the hosts behind the firewall. In particular,
     2823      <p id="rfc.section.10.1.p.3">Proxies which serve as a portal through a network firewall <em class="bcp14">SHOULD</em> take special precautions regarding the transfer of header information that identifies the hosts behind the firewall. In particular,
    28252824         they <em class="bcp14">SHOULD</em> remove, or replace with sanitized versions, any Via fields generated behind the firewall.
    28262825      </p>
    2827       <p id="rfc.section.11.1.p.4">The Referer header field allows reading patterns to be studied and reverse links drawn. Although it can be very useful, its
     2826      <p id="rfc.section.10.1.p.4">The Referer header field allows reading patterns to be studied and reverse links drawn. Although it can be very useful, its
    28282827         power can be abused if user details are not separated from the information contained in the Referer. Even when the personal
    28292828         information has been removed, the Referer header field might indicate a private document's URI whose publication would be
    28302829         inappropriate.
    28312830      </p>
    2832       <p id="rfc.section.11.1.p.5">The information sent in the From field might conflict with the user's privacy interests or their site's security policy, and
     2831      <p id="rfc.section.10.1.p.5">The information sent in the From field might conflict with the user's privacy interests or their site's security policy, and
    28332832         hence it <em class="bcp14">SHOULD NOT</em> be transmitted without the user being able to disable, enable, and modify the contents of the field. The user <em class="bcp14">MUST</em> be able to set the contents of this field within a user preference or application defaults configuration.
    28342833      </p>
    2835       <p id="rfc.section.11.1.p.6">We suggest, though do not require, that a convenient toggle interface be provided for the user to enable or disable the sending
     2834      <p id="rfc.section.10.1.p.6">We suggest, though do not require, that a convenient toggle interface be provided for the user to enable or disable the sending
    28362835         of From and Referer information.
    28372836      </p>
    2838       <p id="rfc.section.11.1.p.7">The User-Agent (<a href="#header.user-agent" id="rfc.xref.header.user-agent.3" title="User-Agent">Section&nbsp;9.10</a>) or Server (<a href="#header.server" id="rfc.xref.header.server.3" title="Server">Section&nbsp;9.9</a>) header fields can sometimes be used to determine that a specific client or server has a particular security hole which might
     2837      <p id="rfc.section.10.1.p.7">The User-Agent (<a href="#header.user-agent" id="rfc.xref.header.user-agent.3" title="User-Agent">Section&nbsp;8.10</a>) or Server (<a href="#header.server" id="rfc.xref.header.server.3" title="Server">Section&nbsp;8.9</a>) header fields can sometimes be used to determine that a specific client or server has a particular security hole which might
    28392838         be exploited. Unfortunately, this same information is often used for other valuable purposes for which HTTP currently has
    28402839         no better mechanism.
    28412840      </p>
    2842       <p id="rfc.section.11.1.p.8">Furthermore, the User-Agent header field may contain enough entropy to be used, possibly in conjunction with other material,
     2841      <p id="rfc.section.10.1.p.8">Furthermore, the User-Agent header field may contain enough entropy to be used, possibly in conjunction with other material,
    28432842         to uniquely identify the user.
    28442843      </p>
    2845       <p id="rfc.section.11.1.p.9">Some request methods, like TRACE (<a href="#TRACE" id="rfc.xref.TRACE.4" title="TRACE">Section&nbsp;6.8</a>), expose information that was sent in request header fields within the body of their response. Clients <em class="bcp14">SHOULD</em> be careful with sensitive information, like Cookies, Authorization credentials, and other header fields that might be used
     2844      <p id="rfc.section.10.1.p.9">Some request methods, like TRACE (<a href="#TRACE" id="rfc.xref.TRACE.4" title="TRACE">Section&nbsp;6.8</a>), expose information that was sent in request header fields within the body of their response. Clients <em class="bcp14">SHOULD</em> be careful with sensitive information, like Cookies, Authorization credentials, and other header fields that might be used
    28462845         to collect data from the client.
    28472846      </p>
    2848       <h2 id="rfc.section.11.2"><a href="#rfc.section.11.2">11.2</a>&nbsp;<a id="encoding.sensitive.information.in.uris" href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></h2>
    2849       <p id="rfc.section.11.2.p.1">Because the source of a link might be private information or might reveal an otherwise private information source, it is strongly
     2847      <h2 id="rfc.section.10.2"><a href="#rfc.section.10.2">10.2</a>&nbsp;<a id="encoding.sensitive.information.in.uris" href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></h2>
     2848      <p id="rfc.section.10.2.p.1">Because the source of a link might be private information or might reveal an otherwise private information source, it is strongly
    28502849         recommended that the user be able to select whether or not the Referer field is sent. For example, a browser client could
    28512850         have a toggle switch for browsing openly/anonymously, which would respectively enable/disable the sending of Referer and From
    28522851         information.
    28532852      </p>
    2854       <p id="rfc.section.11.2.p.2">Clients <em class="bcp14">SHOULD NOT</em> include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
    2855       </p>
    2856       <p id="rfc.section.11.2.p.3">Authors of services <em class="bcp14">SHOULD NOT</em> use GET-based forms for the submission of sensitive data because that data will be placed in the request-target. Many existing
     2853      <p id="rfc.section.10.2.p.2">Clients <em class="bcp14">SHOULD NOT</em> include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
     2854      </p>
     2855      <p id="rfc.section.10.2.p.3">Authors of services <em class="bcp14">SHOULD NOT</em> use GET-based forms for the submission of sensitive data because that data will be placed in the request-target. Many existing
    28572856         servers, proxies, and user agents log or display the request-target in places where it might be visible to third parties.
    28582857         Such services can use POST-based form submission instead.
    28592858      </p>
    2860       <h2 id="rfc.section.11.3"><a href="#rfc.section.11.3">11.3</a>&nbsp;<a id="location.spoofing-leakage" href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></h2>
    2861       <p id="rfc.section.11.3.p.1">If a single server supports multiple organizations that do not trust one another, then it <em class="bcp14">MUST</em> check the values of Location and Content-Location header fields in responses that are generated under control of said organizations
     2859      <h2 id="rfc.section.10.3"><a href="#rfc.section.10.3">10.3</a>&nbsp;<a id="location.spoofing-leakage" href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></h2>
     2860      <p id="rfc.section.10.3.p.1">If a single server supports multiple organizations that do not trust one another, then it <em class="bcp14">MUST</em> check the values of Location and Content-Location header fields in responses that are generated under control of said organizations
    28622861         to make sure that they do not attempt to invalidate resources over which they have no authority.
    28632862      </p>
    2864       <p id="rfc.section.11.3.p.2">Furthermore, appending the fragment identifier from one URI to another one obtained from a Location header field might leak
     2863      <p id="rfc.section.10.3.p.2">Furthermore, appending the fragment identifier from one URI to another one obtained from a Location header field might leak
    28652864         confidential information to the target server — although the fragment identifier is not transmitted in the final request,
    28662865         it might be visible to the user agent through other means, such as scripting.
    28672866      </p>
    2868       <h2 id="rfc.section.11.4"><a href="#rfc.section.11.4">11.4</a>&nbsp;Security Considerations for CONNECT
     2867      <h2 id="rfc.section.10.4"><a href="#rfc.section.10.4">10.4</a>&nbsp;Security Considerations for CONNECT
    28692868      </h2>
    2870       <p id="rfc.section.11.4.p.1">Since tunneled data is opaque to the proxy, there are additional risks to tunneling to other well-known or reserved ports.
     2869      <p id="rfc.section.10.4.p.1">Since tunneled data is opaque to the proxy, there are additional risks to tunneling to other well-known or reserved ports.
    28712870         A HTTP client CONNECTing to port 25 could relay spam via SMTP, for example. As such, proxies <em class="bcp14">SHOULD</em> restrict CONNECT access to a small number of known ports.
    28722871      </p>
    2873       <h1 id="rfc.section.12"><a href="#rfc.section.12">12.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
    2874       <p id="rfc.section.12.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.42"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
    2875       </p>
    2876       <h1 id="rfc.references"><a id="rfc.section.13" href="#rfc.section.13">13.</a> References
     2872      <h1 id="rfc.section.11"><a href="#rfc.section.11">11.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
     2873      <p id="rfc.section.11.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.42"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     2874      </p>
     2875      <h1 id="rfc.references"><a id="rfc.section.12" href="#rfc.section.12">12.</a> References
    28772876      </h1>
    2878       <h2 id="rfc.references.1"><a href="#rfc.section.13.1" id="rfc.section.13.1">13.1</a> Normative References
     2877      <h2 id="rfc.references.1"><a href="#rfc.section.12.1" id="rfc.section.12.1">12.1</a> Normative References
    28792878      </h2>
    28802879      <table>                 
     
    29252924         </tr>
    29262925      </table>
    2927       <h2 id="rfc.references.2"><a href="#rfc.section.13.2" id="rfc.section.13.2">13.2</a> Informative References
     2926      <h2 id="rfc.references.2"><a href="#rfc.section.12.2" id="rfc.section.12.2">12.2</a> Informative References
    29282927      </h2>
    29292928      <table>                     
     
    29992998      <p id="rfc.section.A.p.1">This document takes over the Status Code Registry, previously defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.2"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#status.code.registry" title="Status Code Registry">Section&nbsp;4.2</a>)
    30002999      </p>
    3001       <p id="rfc.section.A.p.2">Clarify definition of POST. (<a href="#POST" id="rfc.xref.POST.3" title="POST">Section&nbsp;6.5</a>)
    3002       </p>
    3003       <p id="rfc.section.A.p.3">Remove requirement to handle all Content-* header fields; ban use of Content-Range with PUT. (<a href="#PUT" id="rfc.xref.PUT.3" title="PUT">Section&nbsp;6.6</a>)
    3004       </p>
    3005       <p id="rfc.section.A.p.4">Take over definition of CONNECT method from <a href="#RFC2817" id="rfc.xref.RFC2817.3"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#CONNECT" id="rfc.xref.CONNECT.3" title="CONNECT">Section&nbsp;6.9</a>)
    3006       </p>
    3007       <p id="rfc.section.A.p.5">Broadened the definition of 203 (Non-Authoritative Information) to include cases of payload transformations as well. (<a href="#status.203" id="rfc.xref.status.203.3" title="203 Non-Authoritative Information">Section&nbsp;7.2.4</a>)
    3008       </p>
    3009       <p id="rfc.section.A.p.6">Status codes 301, 302, and 307: removed the normative requirements on both response payloads and user interaction. (<a href="#status.3xx" title="Redirection 3xx">Section&nbsp;7.3</a>)
    3010       </p>
    3011       <p id="rfc.section.A.p.7">Failed to consider that there are many other request methods that are safe to automatically redirect, and further that the
     3000      <p id="rfc.section.A.p.2">Broadened the definition of 203 (Non-Authoritative Information) to include cases of payload transformations as well. (<a href="#status.203" id="rfc.xref.status.203.3" title="203 Non-Authoritative Information">Section&nbsp;4.3.2.4</a>)
     3001      </p>
     3002      <p id="rfc.section.A.p.3">Status codes 301, 302, and 307: removed the normative requirements on both response payloads and user interaction. (<a href="#status.3xx" title="Redirection 3xx">Section&nbsp;4.3.3</a>)
     3003      </p>
     3004      <p id="rfc.section.A.p.4">Failed to consider that there are many other request methods that are safe to automatically redirect, and further that the
    30123005         user agent is able to make that determination based on the request method semantics. Furthermore, allow user agents to rewrite
    3013          the method from POST to GET for status codes 301 and 302. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">7.3.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">7.3.3</a> and <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">7.3.7</a>)
    3014       </p>
    3015       <p id="rfc.section.A.p.8">Deprecate 305 Use Proxy status code, because user agents did not implement it. It used to indicate that the target resource
     3006         the method from POST to GET for status codes 301 and 302. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">4.3.3.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">4.3.3.3</a> and <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">4.3.3.7</a>)
     3007      </p>
     3008      <p id="rfc.section.A.p.5">Deprecate 305 Use Proxy status code, because user agents did not implement it. It used to indicate that the target resource
    30163009         needs to be accessed through the proxy given by the Location field. The Location field gave the URI of the proxy. The recipient
    3017          was expected to repeat this single request via the proxy. (<a href="#status.305" id="rfc.xref.status.305.3" title="305 Use Proxy">Section&nbsp;7.3.5</a>)
    3018       </p>
    3019       <p id="rfc.section.A.p.9">Define status 426 (Upgrade Required) (this was incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.4"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>). (<a href="#status.426" id="rfc.xref.status.426.3" title="426 Upgrade Required">Section&nbsp;7.4.15</a>)
    3020       </p>
    3021       <p id="rfc.section.A.p.10">Change ABNF productions for header fields to only define the field value. (<a href="#header.field.definitions" title="Header Field Definitions">Section&nbsp;9</a>)
     3010         was expected to repeat this single request via the proxy. (<a href="#status.305" id="rfc.xref.status.305.3" title="305 Use Proxy">Section&nbsp;4.3.3.5</a>)
     3011      </p>
     3012      <p id="rfc.section.A.p.6">Define status 426 (Upgrade Required) (this was incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.3"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>). (<a href="#status.426" id="rfc.xref.status.426.3" title="426 Upgrade Required">Section&nbsp;4.3.4.15</a>)
     3013      </p>
     3014      <p id="rfc.section.A.p.7">Clarify definition of POST. (<a href="#POST" id="rfc.xref.POST.3" title="POST">Section&nbsp;6.5</a>)
     3015      </p>
     3016      <p id="rfc.section.A.p.8">Remove requirement to handle all Content-* header fields; ban use of Content-Range with PUT. (<a href="#PUT" id="rfc.xref.PUT.3" title="PUT">Section&nbsp;6.6</a>)
     3017      </p>
     3018      <p id="rfc.section.A.p.9">Take over definition of CONNECT method from <a href="#RFC2817" id="rfc.xref.RFC2817.4"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#CONNECT" id="rfc.xref.CONNECT.3" title="CONNECT">Section&nbsp;6.9</a>)
     3019      </p>
     3020      <p id="rfc.section.A.p.10">Change ABNF productions for header fields to only define the field value. (<a href="#header.field.definitions" title="Header Field Definitions">Section&nbsp;8</a>)
    30223021      </p>
    30233022      <p id="rfc.section.A.p.11">Reclassify "Allow" as response header field, removing the option to specify it in a PUT request. Relax the server requirement
    3024          on the contents of the Allow header field and remove requirement on clients to always trust the header field value. (<a href="#header.allow" id="rfc.xref.header.allow.4" title="Allow">Section&nbsp;9.1</a>)
     3023         on the contents of the Allow header field and remove requirement on clients to always trust the header field value. (<a href="#header.allow" id="rfc.xref.header.allow.4" title="Allow">Section&nbsp;8.1</a>)
    30253024      </p>
    30263025      <p id="rfc.section.A.p.12">The ABNF for the Expect header field has been both fixed (allowing parameters for value-less expectations as well) and simplified
    3027          (allowing trailing semicolons after "100-continue" when they were invalid before). (<a href="#header.expect" id="rfc.xref.header.expect.4" title="Expect">Section&nbsp;9.3</a>)
     3026         (allowing trailing semicolons after "100-continue" when they were invalid before). (<a href="#header.expect" id="rfc.xref.header.expect.4" title="Expect">Section&nbsp;8.3</a>)
    30283027      </p>
    30293028      <p id="rfc.section.A.p.13">Correct syntax of Location header field to allow URI references (including relative references and fragments), as referred
    30303029         symbol "absoluteURI" wasn't what was expected, and add some clarifications as to when use of fragments would not be appropriate.
    3031          (<a href="#header.location" id="rfc.xref.header.location.5" title="Location">Section&nbsp;9.5</a>)
    3032       </p>
    3033       <p id="rfc.section.A.p.14">Restrict Max-Forwards header field to OPTIONS and TRACE (previously, extension methods could have used it as well). (<a href="#header.max-forwards" id="rfc.xref.header.max-forwards.5" title="Max-Forwards">Section&nbsp;9.6</a>)
    3034       </p>
    3035       <p id="rfc.section.A.p.15">Allow Referer field value of "about:blank" as alternative to not specifying it. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;9.7</a>)
     3030         (<a href="#header.location" id="rfc.xref.header.location.5" title="Location">Section&nbsp;8.5</a>)
     3031      </p>
     3032      <p id="rfc.section.A.p.14">Restrict Max-Forwards header field to OPTIONS and TRACE (previously, extension methods could have used it as well). (<a href="#header.max-forwards" id="rfc.xref.header.max-forwards.5" title="Max-Forwards">Section&nbsp;8.6</a>)
     3033      </p>
     3034      <p id="rfc.section.A.p.15">Allow Referer field value of "about:blank" as alternative to not specifying it. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;8.7</a>)
    30363035      </p>
    30373036      <p id="rfc.section.A.p.16">In the description of the Server header field, the Via field was described as a SHOULD. The requirement was and is stated
    3038          correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.43"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section&nbsp;9.9</a>)
     3037         correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.43"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section&nbsp;8.9</a>)
    30393038      </p>
    30403039      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
     
    34793478         <ul class="ind">
    34803479            <li><a id="rfc.index.1" href="#rfc.index.1"><b>1</b></a><ul>
    3481                   <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.22"><b>7.1.1</b></a>, <a href="#rfc.xref.status.100.2">10.2</a></li>
    3482                   <li>100-continue (expect value)&nbsp;&nbsp;<a href="#rfc.iref.89"><b>9.3</b></a></li>
    3483                   <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.23"><b>7.1.2</b></a>, <a href="#rfc.xref.status.101.2">10.2</a></li>
     3480                  <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.4"><b>4.3.1.1</b></a>, <a href="#rfc.xref.status.100.2">9.2</a></li>
     3481                  <li>100-continue (expect value)&nbsp;&nbsp;<a href="#rfc.iref.89"><b>8.3</b></a></li>
     3482                  <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.5"><b>4.3.1.2</b></a>, <a href="#rfc.xref.status.101.2">9.2</a></li>
    34843483               </ul>
    34853484            </li>
    34863485            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    3487                   <li>200 OK (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.24"><b>7.2.1</b></a>, <a href="#rfc.xref.status.200.2">10.2</a></li>
    3488                   <li>201 Created (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.25"><b>7.2.2</b></a>, <a href="#rfc.xref.status.201.2">10.2</a></li>
    3489                   <li>202 Accepted (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.26"><b>7.2.3</b></a>, <a href="#rfc.xref.status.202.2">10.2</a></li>
    3490                   <li>203 Non-Authoritative Information (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.27"><b>7.2.4</b></a>, <a href="#rfc.xref.status.203.2">10.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
    3491                   <li>204 No Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.28"><b>7.2.5</b></a>, <a href="#rfc.xref.status.204.2">10.2</a></li>
    3492                   <li>205 Reset Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.29"><b>7.2.6</b></a>, <a href="#rfc.xref.status.205.2">10.2</a></li>
     3486                  <li>200 OK (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.6"><b>4.3.2.1</b></a>, <a href="#rfc.xref.status.200.2">9.2</a></li>
     3487                  <li>201 Created (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.7"><b>4.3.2.2</b></a>, <a href="#rfc.xref.status.201.2">9.2</a></li>
     3488                  <li>202 Accepted (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.8"><b>4.3.2.3</b></a>, <a href="#rfc.xref.status.202.2">9.2</a></li>
     3489                  <li>203 Non-Authoritative Information (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.9"><b>4.3.2.4</b></a>, <a href="#rfc.xref.status.203.2">9.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
     3490                  <li>204 No Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.10"><b>4.3.2.5</b></a>, <a href="#rfc.xref.status.204.2">9.2</a></li>
     3491                  <li>205 Reset Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.11"><b>4.3.2.6</b></a>, <a href="#rfc.xref.status.205.2">9.2</a></li>
    34933492               </ul>
    34943493            </li>
    34953494            <li><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul>
    3496                   <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.30"><b>7.3.1</b></a>, <a href="#rfc.xref.status.300.2">10.2</a></li>
    3497                   <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.31"><b>7.3.2</b></a>, <a href="#rfc.xref.status.301.2">10.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
    3498                   <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.32"><b>7.3.3</b></a>, <a href="#rfc.xref.status.302.2">10.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
    3499                   <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.33"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.2">10.2</a></li>
    3500                   <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.34"><b>7.3.5</b></a>, <a href="#rfc.xref.status.305.2">10.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
    3501                   <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.35"><b>7.3.6</b></a>, <a href="#rfc.xref.status.306.1">10.2</a></li>
    3502                   <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.36"><b>7.3.7</b></a>, <a href="#rfc.xref.status.307.2">10.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
     3495                  <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.12"><b>4.3.3.1</b></a>, <a href="#rfc.xref.status.300.2">9.2</a></li>
     3496                  <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.13"><b>4.3.3.2</b></a>, <a href="#rfc.xref.status.301.2">9.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
     3497                  <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.14"><b>4.3.3.3</b></a>, <a href="#rfc.xref.status.302.2">9.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
     3498                  <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.15"><b>4.3.3.4</b></a>, <a href="#rfc.xref.status.303.2">9.2</a></li>
     3499                  <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.16"><b>4.3.3.5</b></a>, <a href="#rfc.xref.status.305.2">9.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
     3500                  <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.17"><b>4.3.3.6</b></a>, <a href="#rfc.xref.status.306.1">9.2</a></li>
     3501                  <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.18"><b>4.3.3.7</b></a>, <a href="#rfc.xref.status.307.2">9.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
    35033502               </ul>
    35043503            </li>
    35053504            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
    3506                   <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.37"><b>7.4.1</b></a>, <a href="#rfc.xref.status.400.2">10.2</a></li>
    3507                   <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.38"><b>7.4.2</b></a>, <a href="#rfc.xref.status.402.2">10.2</a></li>
    3508                   <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.39"><b>7.4.3</b></a>, <a href="#rfc.xref.status.403.2">10.2</a></li>
    3509                   <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.40"><b>7.4.4</b></a>, <a href="#rfc.xref.status.404.2">10.2</a></li>
    3510                   <li>405 Method Not Allowed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.41"><b>7.4.5</b></a>, <a href="#rfc.xref.status.405.2">10.2</a></li>
    3511                   <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.42"><b>7.4.6</b></a>, <a href="#rfc.xref.status.406.2">10.2</a></li>
    3512                   <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.43"><b>7.4.7</b></a>, <a href="#rfc.xref.status.408.2">10.2</a></li>
    3513                   <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.44"><b>7.4.8</b></a>, <a href="#rfc.xref.status.409.2">10.2</a></li>
    3514                   <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.45"><b>7.4.9</b></a>, <a href="#rfc.xref.status.410.2">10.2</a></li>
    3515                   <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.46"><b>7.4.10</b></a>, <a href="#rfc.xref.status.411.2">10.2</a></li>
    3516                   <li>413 Request Representation Too Large (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.47"><b>7.4.11</b></a>, <a href="#rfc.xref.status.413.2">10.2</a></li>
    3517                   <li>414 URI Too Long (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.48"><b>7.4.12</b></a>, <a href="#rfc.xref.status.414.2">10.2</a></li>
    3518                   <li>415 Unsupported Media Type (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.49"><b>7.4.13</b></a>, <a href="#rfc.xref.status.415.2">10.2</a></li>
    3519                   <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.50"><b>7.4.14</b></a>, <a href="#rfc.xref.status.417.2">10.2</a></li>
    3520                   <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.51"><b>7.4.15</b></a>, <a href="#rfc.xref.status.426.2">10.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
     3505                  <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.19"><b>4.3.4.1</b></a>, <a href="#rfc.xref.status.400.2">9.2</a></li>
     3506                  <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.20"><b>4.3.4.2</b></a>, <a href="#rfc.xref.status.402.2">9.2</a></li>
     3507                  <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.21"><b>4.3.4.3</b></a>, <a href="#rfc.xref.status.403.2">9.2</a></li>
     3508                  <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.22"><b>4.3.4.4</b></a>, <a href="#rfc.xref.status.404.2">9.2</a></li>
     3509                  <li>405 Method Not Allowed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.23"><b>4.3.4.5</b></a>, <a href="#rfc.xref.status.405.2">9.2</a></li>
     3510                  <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.24"><b>4.3.4.6</b></a>, <a href="#rfc.xref.status.406.2">9.2</a></li>
     3511                  <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.25"><b>4.3.4.7</b></a>, <a href="#rfc.xref.status.408.2">9.2</a></li>
     3512                  <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.26"><b>4.3.4.8</b></a>, <a href="#rfc.xref.status.409.2">9.2</a></li>
     3513                  <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.27"><b>4.3.4.9</b></a>, <a href="#rfc.xref.status.410.2">9.2</a></li>
     3514                  <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.28"><b>4.3.4.10</b></a>, <a href="#rfc.xref.status.411.2">9.2</a></li>
     3515                  <li>413 Request Representation Too Large (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.29"><b>4.3.4.11</b></a>, <a href="#rfc.xref.status.413.2">9.2</a></li>
     3516                  <li>414 URI Too Long (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.30"><b>4.3.4.12</b></a>, <a href="#rfc.xref.status.414.2">9.2</a></li>
     3517                  <li>415 Unsupported Media Type (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.31"><b>4.3.4.13</b></a>, <a href="#rfc.xref.status.415.2">9.2</a></li>
     3518                  <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.32"><b>4.3.4.14</b></a>, <a href="#rfc.xref.status.417.2">9.2</a></li>
     3519                  <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.33"><b>4.3.4.15</b></a>, <a href="#rfc.xref.status.426.2">9.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
    35213520               </ul>
    35223521            </li>
    35233522            <li><a id="rfc.index.5" href="#rfc.index.5"><b>5</b></a><ul>
    3524                   <li>500 Internal Server Error (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.52"><b>7.5.1</b></a>, <a href="#rfc.xref.status.500.2">10.2</a></li>
    3525                   <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.53"><b>7.5.2</b></a>, <a href="#rfc.xref.status.501.2">10.2</a></li>
    3526                   <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.54"><b>7.5.3</b></a>, <a href="#rfc.xref.status.502.2">10.2</a></li>
    3527                   <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.55"><b>7.5.4</b></a>, <a href="#rfc.xref.status.503.2">10.2</a></li>
    3528                   <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.56"><b>7.5.5</b></a>, <a href="#rfc.xref.status.504.2">10.2</a></li>
    3529                   <li>505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.57"><b>7.5.6</b></a>, <a href="#rfc.xref.status.505.2">10.2</a></li>
     3523                  <li>500 Internal Server Error (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.34"><b>4.3.5.1</b></a>, <a href="#rfc.xref.status.500.2">9.2</a></li>
     3524                  <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.35"><b>4.3.5.2</b></a>, <a href="#rfc.xref.status.501.2">9.2</a></li>
     3525                  <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.36"><b>4.3.5.3</b></a>, <a href="#rfc.xref.status.502.2">9.2</a></li>
     3526                  <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.37"><b>4.3.5.4</b></a>, <a href="#rfc.xref.status.503.2">9.2</a></li>
     3527                  <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.38"><b>4.3.5.5</b></a>, <a href="#rfc.xref.status.504.2">9.2</a></li>
     3528                  <li>505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.39"><b>4.3.5.6</b></a>, <a href="#rfc.xref.status.505.2">9.2</a></li>
    35303529               </ul>
    35313530            </li>
    35323531            <li><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul>
    3533                   <li>Allow header field&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.a.1"><b>9.1</b></a>, <a href="#rfc.xref.header.allow.3">10.3</a>, <a href="#rfc.xref.header.allow.4">A</a></li>
     3532                  <li>Allow header field&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.a.1"><b>8.1</b></a>, <a href="#rfc.xref.header.allow.3">9.3</a>, <a href="#rfc.xref.header.allow.4">A</a></li>
    35343533               </ul>
    35353534            </li>
    35363535            <li><a id="rfc.index.C" href="#rfc.index.C"><b>C</b></a><ul>
    3537                   <li>CONNECT method&nbsp;&nbsp;<a href="#rfc.xref.CONNECT.1">2.1</a>, <a href="#rfc.iref.c.1"><b>6.9</b></a>, <a href="#rfc.xref.CONNECT.2">10.1</a>, <a href="#rfc.xref.CONNECT.3">A</a></li>
     3536                  <li>CONNECT method&nbsp;&nbsp;<a href="#rfc.xref.CONNECT.1">2.1</a>, <a href="#rfc.iref.c.1"><b>6.9</b></a>, <a href="#rfc.xref.CONNECT.2">9.1</a>, <a href="#rfc.xref.CONNECT.3">A</a></li>
    35383537               </ul>
    35393538            </li>
    35403539            <li><a id="rfc.index.D" href="#rfc.index.D"><b>D</b></a><ul>
    3541                   <li>Date header field&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.d.2"><b>9.2</b></a>, <a href="#rfc.xref.header.date.2">10.3</a></li>
    3542                   <li>DELETE method&nbsp;&nbsp;<a href="#rfc.xref.DELETE.1">2.1</a>, <a href="#rfc.iref.d.1"><b>6.7</b></a>, <a href="#rfc.xref.DELETE.2">10.1</a></li>
    3543                   <li><em>draft-reschke-http-status-308</em>&nbsp;&nbsp;<a href="#rfc.xref.draft-reschke-http-status-308.1">7.3.7</a>, <a href="#draft-reschke-http-status-308"><b>13.2</b></a></li>
     3540                  <li>Date header field&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.d.2"><b>8.2</b></a>, <a href="#rfc.xref.header.date.2">9.3</a></li>
     3541                  <li>DELETE method&nbsp;&nbsp;<a href="#rfc.xref.DELETE.1">2.1</a>, <a href="#rfc.iref.d.1"><b>6.7</b></a>, <a href="#rfc.xref.DELETE.2">9.1</a></li>
     3542                  <li><em>draft-reschke-http-status-308</em>&nbsp;&nbsp;<a href="#rfc.xref.draft-reschke-http-status-308.1">4.3.3.7</a>, <a href="#draft-reschke-http-status-308"><b>12.2</b></a></li>
    35443543               </ul>
    35453544            </li>
    35463545            <li><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul>
    3547                   <li>Expect header field&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">7.4.14</a>, <a href="#rfc.iref.e.1"><b>9.3</b></a>, <a href="#rfc.xref.header.expect.3">10.3</a>, <a href="#rfc.xref.header.expect.4">A</a></li>
     3546                  <li>Expect header field&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.3.4.14</a>, <a href="#rfc.iref.e.1"><b>8.3</b></a>, <a href="#rfc.xref.header.expect.3">9.3</a>, <a href="#rfc.xref.header.expect.4">A</a></li>
    35483547                  <li>Expect Values&nbsp;&nbsp;
    35493548                     <ul>
    3550                         <li>100-continue&nbsp;&nbsp;<a href="#rfc.iref.e.2"><b>9.3</b></a></li>
     3549                        <li>100-continue&nbsp;&nbsp;<a href="#rfc.iref.e.2"><b>8.3</b></a></li>
    35513550                     </ul>
    35523551                  </li>
     
    35543553            </li>
    35553554            <li><a id="rfc.index.F" href="#rfc.index.F"><b>F</b></a><ul>
    3556                   <li>From header field&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.f.1"><b>9.4</b></a>, <a href="#rfc.xref.header.from.2">10.3</a></li>
     3555                  <li>From header field&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.f.1"><b>8.4</b></a>, <a href="#rfc.xref.header.from.2">9.3</a></li>
    35573556               </ul>
    35583557            </li>
    35593558            <li><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul>
    3560                   <li>GET method&nbsp;&nbsp;<a href="#rfc.xref.GET.1">2.1</a>, <a href="#rfc.iref.g.5"><b>6.3</b></a>, <a href="#rfc.xref.GET.2">10.1</a></li>
     3559                  <li>GET method&nbsp;&nbsp;<a href="#rfc.xref.GET.1">2.1</a>, <a href="#rfc.iref.g.5"><b>6.3</b></a>, <a href="#rfc.xref.GET.2">9.1</a></li>
    35613560                  <li><tt>Grammar</tt>&nbsp;&nbsp;
    35623561                     <ul>
    3563                         <li><tt>Allow</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>9.1</b></a></li>
    3564                         <li><tt>asctime-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>8.1</b></a></li>
    3565                         <li><tt>Date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.25"><b>9.2</b></a></li>
    3566                         <li><tt>date1</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>8.1</b></a></li>
    3567                         <li><tt>day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>8.1</b></a></li>
    3568                         <li><tt>day-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>8.1</b></a></li>
    3569                         <li><tt>day-name-l</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>8.1</b></a></li>
    3570                         <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.36"><b>9.8</b></a></li>
    3571                         <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.26"><b>9.3</b></a></li>
    3572                         <li><tt>expect-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>9.3</b></a></li>
    3573                         <li><tt>expect-param</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.28"><b>9.3</b></a></li>
    3574                         <li><tt>expect-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.29"><b>9.3</b></a></li>
    3575                         <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.27"><b>9.3</b></a></li>
     3562                        <li><tt>Allow</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>8.1</b></a></li>
     3563                        <li><tt>asctime-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>7.1</b></a></li>
     3564                        <li><tt>Date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.25"><b>8.2</b></a></li>
     3565                        <li><tt>date1</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>7.1</b></a></li>
     3566                        <li><tt>day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>7.1</b></a></li>
     3567                        <li><tt>day-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>7.1</b></a></li>
     3568                        <li><tt>day-name-l</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>7.1</b></a></li>
     3569                        <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.36"><b>8.8</b></a></li>
     3570                        <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.26"><b>8.3</b></a></li>
     3571                        <li><tt>expect-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>8.3</b></a></li>
     3572                        <li><tt>expect-param</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.28"><b>8.3</b></a></li>
     3573                        <li><tt>expect-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.29"><b>8.3</b></a></li>
     3574                        <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.27"><b>8.3</b></a></li>
    35763575                        <li><tt>extension-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>4</b></a></li>
    3577                         <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>9.4</b></a></li>
    3578                         <li><tt>GMT</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>8.1</b></a></li>
    3579                         <li><tt>hour</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>8.1</b></a></li>
    3580                         <li><tt>HTTP-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>8.1</b></a></li>
    3581                         <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>9.5</b></a></li>
    3582                         <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>9.6</b></a></li>
     3576                        <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>8.4</b></a></li>
     3577                        <li><tt>GMT</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>7.1</b></a></li>
     3578                        <li><tt>hour</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>7.1</b></a></li>
     3579                        <li><tt>HTTP-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>7.1</b></a></li>
     3580                        <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>8.5</b></a></li>
     3581                        <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>8.6</b></a></li>
    35833582                        <li><tt>method</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.1"><b>2</b></a></li>
    3584                         <li><tt>minute</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>8.1</b></a></li>
    3585                         <li><tt>month</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>8.1</b></a></li>
    3586                         <li><tt>obs-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>8.1</b></a></li>
    3587                         <li><tt>product</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>8.2</b></a></li>
    3588                         <li><tt>product-version</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>8.2</b></a></li>
     3583                        <li><tt>minute</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>7.1</b></a></li>
     3584                        <li><tt>month</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>7.1</b></a></li>
     3585                        <li><tt>obs-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>7.1</b></a></li>
     3586                        <li><tt>product</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>7.2</b></a></li>
     3587                        <li><tt>product-version</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>7.2</b></a></li>
    35893588                        <li><tt>reason-phrase</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>4</b></a></li>
    3590                         <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>9.7</b></a></li>
    3591                         <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>9.8</b></a></li>
    3592                         <li><tt>rfc1123-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>8.1</b></a></li>
    3593                         <li><tt>rfc850-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>8.1</b></a></li>
    3594                         <li><tt>second</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>8.1</b></a></li>
    3595                         <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.37"><b>9.9</b></a></li>
     3589                        <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>8.7</b></a></li>
     3590                        <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>8.8</b></a></li>
     3591                        <li><tt>rfc1123-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>7.1</b></a></li>
     3592                        <li><tt>rfc850-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>7.1</b></a></li>
     3593                        <li><tt>second</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>7.1</b></a></li>
     3594                        <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.37"><b>8.9</b></a></li>
    35963595                        <li><tt>status-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>4</b></a></li>
    3597                         <li><tt>time-of-day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>8.1</b></a></li>
    3598                         <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.38"><b>9.10</b></a></li>
    3599                         <li><tt>year</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>8.1</b></a></li>
     3596                        <li><tt>time-of-day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>7.1</b></a></li>
     3597                        <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.38"><b>8.10</b></a></li>
     3598                        <li><tt>year</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>7.1</b></a></li>
    36003599                     </ul>
    36013600                  </li>
     
    36033602            </li>
    36043603            <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul>
    3605                   <li>HEAD method&nbsp;&nbsp;<a href="#rfc.xref.HEAD.1">2.1</a>, <a href="#rfc.iref.h.1"><b>6.4</b></a>, <a href="#rfc.xref.HEAD.2">10.1</a></li>
     3604                  <li>HEAD method&nbsp;&nbsp;<a href="#rfc.xref.HEAD.1">2.1</a>, <a href="#rfc.iref.h.1"><b>6.4</b></a>, <a href="#rfc.xref.HEAD.2">9.1</a></li>
    36063605                  <li>Header Fields&nbsp;&nbsp;
    36073606                     <ul>
    3608                         <li>Allow&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.h.2"><b>9.1</b></a>, <a href="#rfc.xref.header.allow.3">10.3</a>, <a href="#rfc.xref.header.allow.4">A</a></li>
    3609                         <li>Date&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.h.3"><b>9.2</b></a>, <a href="#rfc.xref.header.date.2">10.3</a></li>
    3610                         <li>Expect&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">7.4.14</a>, <a href="#rfc.iref.h.4"><b>9.3</b></a>, <a href="#rfc.xref.header.expect.3">10.3</a>, <a href="#rfc.xref.header.expect.4">A</a></li>
    3611                         <li>From&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.h.5"><b>9.4</b></a>, <a href="#rfc.xref.header.from.2">10.3</a></li>
    3612                         <li>Location&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">3.3</a>, <a href="#rfc.xref.header.location.2">6.5</a>, <a href="#rfc.xref.header.location.3">7.3</a>, <a href="#rfc.iref.h.6"><b>9.5</b></a>, <a href="#rfc.xref.header.location.4">10.3</a>, <a href="#rfc.xref.header.location.5">A</a></li>
    3613                         <li>Max-Forwards&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">3.2</a>, <a href="#rfc.xref.header.max-forwards.2">6.2</a>, <a href="#rfc.xref.header.max-forwards.3">6.8</a>, <a href="#rfc.iref.h.7"><b>9.6</b></a>, <a href="#rfc.xref.header.max-forwards.4">10.3</a>, <a href="#rfc.xref.header.max-forwards.5">A</a></li>
    3614                         <li>Referer&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.h.8"><b>9.7</b></a>, <a href="#rfc.xref.header.referer.2">10.3</a>, <a href="#rfc.xref.header.referer.3">A</a></li>
    3615                         <li>Retry-After&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">7.5.4</a>, <a href="#rfc.iref.h.9"><b>9.8</b></a>, <a href="#rfc.xref.header.retry-after.3">10.3</a></li>
    3616                         <li>Server&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.h.10"><b>9.9</b></a>, <a href="#rfc.xref.header.server.2">10.3</a>, <a href="#rfc.xref.header.server.3">11.1</a>, <a href="#rfc.xref.header.server.4">A</a></li>
    3617                         <li>User-Agent&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.iref.h.11"><b>9.10</b></a>, <a href="#rfc.xref.header.user-agent.2">10.3</a>, <a href="#rfc.xref.header.user-agent.3">11.1</a></li>
     3607                        <li>Allow&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.h.2"><b>8.1</b></a>, <a href="#rfc.xref.header.allow.3">9.3</a>, <a href="#rfc.xref.header.allow.4">A</a></li>
     3608                        <li>Date&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.h.3"><b>8.2</b></a>, <a href="#rfc.xref.header.date.2">9.3</a></li>
     3609                        <li>Expect&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.3.4.14</a>, <a href="#rfc.iref.h.4"><b>8.3</b></a>, <a href="#rfc.xref.header.expect.3">9.3</a>, <a href="#rfc.xref.header.expect.4">A</a></li>
     3610                        <li>From&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.h.5"><b>8.4</b></a>, <a href="#rfc.xref.header.from.2">9.3</a></li>
     3611                        <li>Location&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">3.3</a>, <a href="#rfc.xref.header.location.2">4.3.3</a>, <a href="#rfc.xref.header.location.3">6.5</a>, <a href="#rfc.iref.h.6"><b>8.5</b></a>, <a href="#rfc.xref.header.location.4">9.3</a>, <a href="#rfc.xref.header.location.5">A</a></li>
     3612                        <li>Max-Forwards&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">3.2</a>, <a href="#rfc.xref.header.max-forwards.2">6.2</a>, <a href="#rfc.xref.header.max-forwards.3">6.8</a>, <a href="#rfc.iref.h.7"><b>8.6</b></a>, <a href="#rfc.xref.header.max-forwards.4">9.3</a>, <a href="#rfc.xref.header.max-forwards.5">A</a></li>
     3613                        <li>Referer&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.h.8"><b>8.7</b></a>, <a href="#rfc.xref.header.referer.2">9.3</a>, <a href="#rfc.xref.header.referer.3">A</a></li>
     3614                        <li>Retry-After&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.3.5.4</a>, <a href="#rfc.iref.h.9"><b>8.8</b></a>, <a href="#rfc.xref.header.retry-after.3">9.3</a></li>
     3615                        <li>Server&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.h.10"><b>8.9</b></a>, <a href="#rfc.xref.header.server.2">9.3</a>, <a href="#rfc.xref.header.server.3">10.1</a>, <a href="#rfc.xref.header.server.4">A</a></li>
     3616                        <li>User-Agent&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.iref.h.11"><b>8.10</b></a>, <a href="#rfc.xref.header.user-agent.2">9.3</a>, <a href="#rfc.xref.header.user-agent.3">10.1</a></li>
    36183617                     </ul>
    36193618                  </li>
     
    36253624            </li>
    36263625            <li><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul>
    3627                   <li>Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">3.3</a>, <a href="#rfc.xref.header.location.2">6.5</a>, <a href="#rfc.xref.header.location.3">7.3</a>, <a href="#rfc.iref.l.1"><b>9.5</b></a>, <a href="#rfc.xref.header.location.4">10.3</a>, <a href="#rfc.xref.header.location.5">A</a></li>
     3626                  <li>Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">3.3</a>, <a href="#rfc.xref.header.location.2">4.3.3</a>, <a href="#rfc.xref.header.location.3">6.5</a>, <a href="#rfc.iref.l.1"><b>8.5</b></a>, <a href="#rfc.xref.header.location.4">9.3</a>, <a href="#rfc.xref.header.location.5">A</a></li>
    36283627               </ul>
    36293628            </li>
    36303629            <li><a id="rfc.index.M" href="#rfc.index.M"><b>M</b></a><ul>
    3631                   <li>Max-Forwards header field&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">3.2</a>, <a href="#rfc.xref.header.max-forwards.2">6.2</a>, <a href="#rfc.xref.header.max-forwards.3">6.8</a>, <a href="#rfc.iref.m.9"><b>9.6</b></a>, <a href="#rfc.xref.header.max-forwards.4">10.3</a>, <a href="#rfc.xref.header.max-forwards.5">A</a></li>
     3630                  <li>Max-Forwards header field&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">3.2</a>, <a href="#rfc.xref.header.max-forwards.2">6.2</a>, <a href="#rfc.xref.header.max-forwards.3">6.8</a>, <a href="#rfc.iref.m.9"><b>8.6</b></a>, <a href="#rfc.xref.header.max-forwards.4">9.3</a>, <a href="#rfc.xref.header.max-forwards.5">A</a></li>
    36323631                  <li>Methods&nbsp;&nbsp;
    36333632                     <ul>
    3634                         <li>CONNECT&nbsp;&nbsp;<a href="#rfc.xref.CONNECT.1">2.1</a>, <a href="#rfc.iref.m.8"><b>6.9</b></a>, <a href="#rfc.xref.CONNECT.2">10.1</a>, <a href="#rfc.xref.CONNECT.3">A</a></li>
    3635                         <li>DELETE&nbsp;&nbsp;<a href="#rfc.xref.DELETE.1">2.1</a>, <a href="#rfc.iref.m.6"><b>6.7</b></a>, <a href="#rfc.xref.DELETE.2">10.1</a></li>
    3636                         <li>GET&nbsp;&nbsp;<a href="#rfc.xref.GET.1">2.1</a>, <a href="#rfc.iref.m.2"><b>6.3</b></a>, <a href="#rfc.xref.GET.2">10.1</a></li>
    3637                         <li>HEAD&nbsp;&nbsp;<a href="#rfc.xref.HEAD.1">2.1</a>, <a href="#rfc.iref.m.3"><b>6.4</b></a>, <a href="#rfc.xref.HEAD.2">10.1</a></li>
    3638                         <li>OPTIONS&nbsp;&nbsp;<a href="#rfc.xref.OPTIONS.1">2.1</a>, <a href="#rfc.iref.m.1"><b>6.2</b></a>, <a href="#rfc.xref.OPTIONS.2">9.6</a>, <a href="#rfc.xref.OPTIONS.3">10.1</a></li>
    3639                         <li>POST&nbsp;&nbsp;<a href="#rfc.xref.POST.1">2.1</a>, <a href="#rfc.iref.m.4"><b>6.5</b></a>, <a href="#rfc.xref.POST.2">10.1</a>, <a href="#rfc.xref.POST.3">A</a></li>
    3640                         <li>PUT&nbsp;&nbsp;<a href="#rfc.xref.PUT.1">2.1</a>, <a href="#rfc.iref.m.5"><b>6.6</b></a>, <a href="#rfc.xref.PUT.2">10.1</a>, <a href="#rfc.xref.PUT.3">A</a></li>
    3641                         <li>TRACE&nbsp;&nbsp;<a href="#rfc.xref.TRACE.1">2.1</a>, <a href="#rfc.iref.m.7"><b>6.8</b></a>, <a href="#rfc.xref.TRACE.2">9.6</a>, <a href="#rfc.xref.TRACE.3">10.1</a>, <a href="#rfc.xref.TRACE.4">11.1</a></li>
     3633                        <li>CONNECT&nbsp;&nbsp;<a href="#rfc.xref.CONNECT.1">2.1</a>, <a href="#rfc.iref.m.8"><b>6.9</b></a>, <a href="#rfc.xref.CONNECT.2">9.1</a>, <a href="#rfc.xref.CONNECT.3">A</a></li>
     3634                        <li>DELETE&nbsp;&nbsp;<a href="#rfc.xref.DELETE.1">2.1</a>, <a href="#rfc.iref.m.6"><b>6.7</b></a>, <a href="#rfc.xref.DELETE.2">9.1</a></li>
     3635                        <li>GET&nbsp;&nbsp;<a href="#rfc.xref.GET.1">2.1</a>, <a href="#rfc.iref.m.2"><b>6.3</b></a>, <a href="#rfc.xref.GET.2">9.1</a></li>
     3636                        <li>HEAD&nbsp;&nbsp;<a href="#rfc.xref.HEAD.1">2.1</a>, <a href="#rfc.iref.m.3"><b>6.4</b></a>, <a href="#rfc.xref.HEAD.2">9.1</a></li>
     3637                        <li>OPTIONS&nbsp;&nbsp;<a href="#rfc.xref.OPTIONS.1">2.1</a>, <a href="#rfc.iref.m.1"><b>6.2</b></a>, <a href="#rfc.xref.OPTIONS.2">8.6</a>, <a href="#rfc.xref.OPTIONS.3">9.1</a></li>
     3638                        <li>POST&nbsp;&nbsp;<a href="#rfc.xref.POST.1">2.1</a>, <a href="#rfc.iref.m.4"><b>6.5</b></a>, <a href="#rfc.xref.POST.2">9.1</a>, <a href="#rfc.xref.POST.3">A</a></li>
     3639                        <li>PUT&nbsp;&nbsp;<a href="#rfc.xref.PUT.1">2.1</a>, <a href="#rfc.iref.m.5"><b>6.6</b></a>, <a href="#rfc.xref.PUT.2">9.1</a>, <a href="#rfc.xref.PUT.3">A</a></li>
     3640                        <li>TRACE&nbsp;&nbsp;<a href="#rfc.xref.TRACE.1">2.1</a>, <a href="#rfc.iref.m.7"><b>6.8</b></a>, <a href="#rfc.xref.TRACE.2">8.6</a>, <a href="#rfc.xref.TRACE.3">9.1</a>, <a href="#rfc.xref.TRACE.4">10.1</a></li>
    36423641                     </ul>
    36433642                  </li>
     
    36453644            </li>
    36463645            <li><a id="rfc.index.O" href="#rfc.index.O"><b>O</b></a><ul>
    3647                   <li>OPTIONS method&nbsp;&nbsp;<a href="#rfc.xref.OPTIONS.1">2.1</a>, <a href="#rfc.iref.o.1"><b>6.2</b></a>, <a href="#rfc.xref.OPTIONS.2">9.6</a>, <a href="#rfc.xref.OPTIONS.3">10.1</a></li>
     3646                  <li>OPTIONS method&nbsp;&nbsp;<a href="#rfc.xref.OPTIONS.1">2.1</a>, <a href="#rfc.iref.o.1"><b>6.2</b></a>, <a href="#rfc.xref.OPTIONS.2">8.6</a>, <a href="#rfc.xref.OPTIONS.3">9.1</a></li>
    36483647               </ul>
    36493648            </li>
    36503649            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
    3651                   <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1</a>, <a href="#rfc.xref.Part1.2">1.1</a>, <a href="#rfc.xref.Part1.3">1.2</a>, <a href="#rfc.xref.Part1.4">1.2.1</a>, <a href="#rfc.xref.Part1.5">1.2.1</a>, <a href="#rfc.xref.Part1.6">1.2.1</a>, <a href="#rfc.xref.Part1.7">1.2.1</a>, <a href="#rfc.xref.Part1.8">1.2.1</a>, <a href="#rfc.xref.Part1.9">1.2.1</a>, <a href="#rfc.xref.Part1.10">1.2.1</a>, <a href="#rfc.xref.Part1.11">1.2.2</a>, <a href="#rfc.xref.Part1.12">1.2.2</a>, <a href="#rfc.xref.Part1.13">1.2.2</a>, <a href="#rfc.xref.Part1.14">1.2.2</a>, <a href="#rfc.xref.Part1.15">2</a>, <a href="#rfc.xref.Part1.16">2.2.1</a>, <a href="#rfc.xref.Part1.17">3</a>, <a href="#rfc.xref.Part1.18">3.1</a>, <a href="#rfc.xref.Part1.19">3.1</a>, <a href="#rfc.xref.Part1.20">3.1</a>, <a href="#rfc.xref.Part1.21">3.1</a>, <a href="#rfc.xref.Part1.22">3.1</a>, <a href="#rfc.xref.Part1.23">3.2</a>, <a href="#rfc.xref.Part1.24">3.2</a>, <a href="#rfc.xref.Part1.25">3.3</a>, <a href="#rfc.xref.Part1.26">5</a>, <a href="#rfc.xref.Part1.27">5.1</a>, <a href="#rfc.xref.Part1.28">6.2</a>, <a href="#rfc.xref.Part1.29">6.8</a>, <a href="#rfc.xref.Part1.30">6.8</a>, <a href="#rfc.xref.Part1.31">6.9</a>, <a href="#rfc.xref.Part1.32">7.1.1</a>, <a href="#rfc.xref.Part1.33">7.1.2</a>, <a href="#rfc.xref.Part1.34">7.2.4</a>, <a href="#rfc.xref.Part1.35">7.2.6</a>, <a href="#rfc.xref.Part1.36">7.4.15</a>, <a href="#rfc.xref.Part1.37">7.5.6</a>, <a href="#rfc.xref.Part1.38">9.3</a>, <a href="#rfc.xref.Part1.39">9.9</a>, <a href="#rfc.xref.Part1.40">9.9</a>, <a href="#rfc.xref.Part1.41">9.10</a>, <a href="#rfc.xref.Part1.42">12</a>, <a href="#Part1"><b>13.1</b></a>, <a href="#rfc.xref.Part1.43">A</a><ul>
     3650                  <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1</a>, <a href="#rfc.xref.Part1.2">1.1</a>, <a href="#rfc.xref.Part1.3">1.2</a>, <a href="#rfc.xref.Part1.4">1.2.1</a>, <a href="#rfc.xref.Part1.5">1.2.1</a>, <a href="#rfc.xref.Part1.6">1.2.1</a>, <a href="#rfc.xref.Part1.7">1.2.1</a>, <a href="#rfc.xref.Part1.8">1.2.1</a>, <a href="#rfc.xref.Part1.9">1.2.1</a>, <a href="#rfc.xref.Part1.10">1.2.1</a>, <a href="#rfc.xref.Part1.11">1.2.2</a>, <a href="#rfc.xref.Part1.12">1.2.2</a>, <a href="#rfc.xref.Part1.13">1.2.2</a>, <a href="#rfc.xref.Part1.14">1.2.2</a>, <a href="#rfc.xref.Part1.15">2</a>, <a href="#rfc.xref.Part1.16">2.2.1</a>, <a href="#rfc.xref.Part1.17">3</a>, <a href="#rfc.xref.Part1.18">3.1</a>, <a href="#rfc.xref.Part1.19">3.1</a>, <a href="#rfc.xref.Part1.20">3.1</a>, <a href="#rfc.xref.Part1.21">3.1</a>, <a href="#rfc.xref.Part1.22">3.1</a>, <a href="#rfc.xref.Part1.23">3.2</a>, <a href="#rfc.xref.Part1.24">3.2</a>, <a href="#rfc.xref.Part1.25">3.3</a>, <a href="#rfc.xref.Part1.26">4.3.1.1</a>, <a href="#rfc.xref.Part1.27">4.3.1.2</a>, <a href="#rfc.xref.Part1.28">4.3.2.4</a>, <a href="#rfc.xref.Part1.29">4.3.2.6</a>, <a href="#rfc.xref.Part1.30">4.3.4.15</a>, <a href="#rfc.xref.Part1.31">4.3.5.6</a>, <a href="#rfc.xref.Part1.32">5</a>, <a href="#rfc.xref.Part1.33">5.1</a>, <a href="#rfc.xref.Part1.34">6.2</a>, <a href="#rfc.xref.Part1.35">6.8</a>, <a href="#rfc.xref.Part1.36">6.8</a>, <a href="#rfc.xref.Part1.37">6.9</a>, <a href="#rfc.xref.Part1.38">8.3</a>, <a href="#rfc.xref.Part1.39">8.9</a>, <a href="#rfc.xref.Part1.40">8.9</a>, <a href="#rfc.xref.Part1.41">8.10</a>, <a href="#rfc.xref.Part1.42">11</a>, <a href="#Part1"><b>12.1</b></a>, <a href="#rfc.xref.Part1.43">A</a><ul>
    36523651                        <li><em>Section 1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.3">1.2</a></li>
    36533652                        <li><em>Section 2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.2">1.1</a></li>
    3654                         <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.34">7.2.4</a></li>
    3655                         <li><em>Section 2.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.37">7.5.6</a></li>
     3653                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.28">4.3.2.4</a></li>
     3654                        <li><em>Section 2.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.31">4.3.5.6</a></li>
    36563655                        <li><em>Section 2.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.11">1.2.2</a>, <a href="#rfc.xref.Part1.13">1.2.2</a>, <a href="#rfc.xref.Part1.14">1.2.2</a></li>
    36573656                        <li><em>Section 3.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.5">1.2.1</a>, <a href="#rfc.xref.Part1.6">1.2.1</a>, <a href="#rfc.xref.Part1.7">1.2.1</a></li>
    3658                         <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.17">3</a>, <a href="#rfc.xref.Part1.20">3.1</a>, <a href="#rfc.xref.Part1.39">9.9</a>, <a href="#rfc.xref.Part1.41">9.10</a></li>
     3657                        <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.17">3</a>, <a href="#rfc.xref.Part1.20">3.1</a>, <a href="#rfc.xref.Part1.39">8.9</a>, <a href="#rfc.xref.Part1.41">8.10</a></li>
    36593658                        <li><em>Section 3.2.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.8">1.2.1</a>, <a href="#rfc.xref.Part1.9">1.2.1</a>, <a href="#rfc.xref.Part1.10">1.2.1</a>, <a href="#rfc.xref.Part1.12">1.2.2</a>, <a href="#rfc.xref.Part1.19">3.1</a></li>
    36603659                        <li><em>Section 3.2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.18">3.1</a></li>
    3661                         <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.16">2.2.1</a>, <a href="#rfc.xref.Part1.26">5</a>, <a href="#rfc.xref.Part1.35">7.2.6</a></li>
     3660                        <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.16">2.2.1</a>, <a href="#rfc.xref.Part1.29">4.3.2.6</a>, <a href="#rfc.xref.Part1.32">5</a></li>
    36623661                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.22">3.1</a></li>
    36633662                        <li><em>Section 4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.24">3.2</a></li>
    3664                         <li><em>Section 5.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.28">6.2</a>, <a href="#rfc.xref.Part1.31">6.9</a></li>
     3663                        <li><em>Section 5.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.34">6.2</a>, <a href="#rfc.xref.Part1.37">6.9</a></li>
    36653664                        <li><em>Section 5.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.23">3.2</a></li>
    3666                         <li><em>Section 5.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.15">2</a>, <a href="#rfc.xref.Part1.25">3.3</a>, <a href="#rfc.xref.Part1.27">5.1</a></li>
     3665                        <li><em>Section 5.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.15">2</a>, <a href="#rfc.xref.Part1.25">3.3</a>, <a href="#rfc.xref.Part1.33">5.1</a></li>
    36673666                        <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.21">3.1</a></li>
    3668                         <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.29">6.8</a>, <a href="#rfc.xref.Part1.40">9.9</a>, <a href="#rfc.xref.Part1.43">A</a></li>
    3669                         <li><em>Section 6.4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.32">7.1.1</a>, <a href="#rfc.xref.Part1.38">9.3</a></li>
    3670                         <li><em>Section 6.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.33">7.1.2</a>, <a href="#rfc.xref.Part1.36">7.4.15</a></li>
    3671                         <li><em>Section 7.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.30">6.8</a></li>
    3672                         <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.42">12</a></li>
     3667                        <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.35">6.8</a>, <a href="#rfc.xref.Part1.40">8.9</a>, <a href="#rfc.xref.Part1.43">A</a></li>
     3668                        <li><em>Section 6.4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.26">4.3.1.1</a>, <a href="#rfc.xref.Part1.38">8.3</a></li>
     3669                        <li><em>Section 6.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.27">4.3.1.2</a>, <a href="#rfc.xref.Part1.30">4.3.4.15</a></li>
     3670                        <li><em>Section 7.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.36">6.8</a></li>
     3671                        <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.42">11</a></li>
    36733672                     </ul>
    36743673                  </li>
    3675                   <li><em>Part3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.1</a>, <a href="#rfc.xref.Part3.2">3.1</a>, <a href="#rfc.xref.Part3.3">3.2</a>, <a href="#rfc.xref.Part3.4">3.2</a>, <a href="#rfc.xref.Part3.5">3.2</a>, <a href="#rfc.xref.Part3.6">3.2</a>, <a href="#rfc.xref.Part3.7">5</a>, <a href="#rfc.xref.Part3.8">6.5</a>, <a href="#rfc.xref.Part3.9">7</a>, <a href="#rfc.xref.Part3.10">7.3</a>, <a href="#rfc.xref.Part3.11">7.3.1</a>, <a href="#rfc.xref.Part3.12">7.4.6</a>, <a href="#rfc.xref.Part3.13">9.5</a>, <a href="#Part3"><b>13.1</b></a><ul>
     3674                  <li><em>Part3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.1</a>, <a href="#rfc.xref.Part3.2">3.1</a>, <a href="#rfc.xref.Part3.3">3.2</a>, <a href="#rfc.xref.Part3.4">3.2</a>, <a href="#rfc.xref.Part3.5">3.2</a>, <a href="#rfc.xref.Part3.6">3.2</a>, <a href="#rfc.xref.Part3.7">4.3</a>, <a href="#rfc.xref.Part3.8">4.3.3</a>, <a href="#rfc.xref.Part3.9">4.3.3.1</a>, <a href="#rfc.xref.Part3.10">4.3.4.6</a>, <a href="#rfc.xref.Part3.11">5</a>, <a href="#rfc.xref.Part3.12">6.5</a>, <a href="#rfc.xref.Part3.13">8.5</a>, <a href="#Part3"><b>12.1</b></a><ul>
    36763675                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.2">3.1</a></li>
    3677                         <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.11">7.3.1</a></li>
    3678                         <li><em>Section 5.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.10">7.3</a></li>
     3676                        <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.9">4.3.3.1</a></li>
     3677                        <li><em>Section 5.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.8">4.3.3</a></li>
    36793678                        <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.3">3.2</a></li>
    3680                         <li><em>Section 6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.12">7.4.6</a></li>
     3679                        <li><em>Section 6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.10">4.3.4.6</a></li>
    36813680                        <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.4">3.2</a></li>
    36823681                        <li><em>Section 6.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.5">3.2</a></li>
    36833682                        <li><em>Section 6.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.6">3.2</a></li>
    3684                         <li><em>Section 6.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.8">6.5</a>, <a href="#rfc.xref.Part3.13">9.5</a></li>
    3685                         <li><em>Section 6.8</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.1</a>, <a href="#rfc.xref.Part3.9">7</a></li>
     3683                        <li><em>Section 6.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.12">6.5</a>, <a href="#rfc.xref.Part3.13">8.5</a></li>
     3684                        <li><em>Section 6.8</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.1</a>, <a href="#rfc.xref.Part3.7">4.3</a></li>
    36863685                     </ul>
    36873686                  </li>
    3688                   <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">3.2</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">3.2</a>, <a href="#rfc.xref.Part4.5">3.3</a>, <a href="#rfc.xref.Part4.6">4.1</a>, <a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.8">4.1</a>, <a href="#rfc.xref.Part4.9">7.2.2</a>, <a href="#rfc.xref.Part4.10">7.3</a>, <a href="#Part4"><b>13.1</b></a>, <a href="#rfc.xref.Part4.11">C.2</a><ul>
    3689                         <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.5">3.3</a>, <a href="#rfc.xref.Part4.9">7.2.2</a></li>
     3687                  <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">3.2</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">3.2</a>, <a href="#rfc.xref.Part4.5">3.3</a>, <a href="#rfc.xref.Part4.6">4.1</a>, <a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.8">4.1</a>, <a href="#rfc.xref.Part4.9">4.3.2.2</a>, <a href="#rfc.xref.Part4.10">4.3.3</a>, <a href="#Part4"><b>12.1</b></a>, <a href="#rfc.xref.Part4.11">C.2</a><ul>
     3688                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.5">3.3</a>, <a href="#rfc.xref.Part4.9">4.3.2.2</a></li>
    36903689                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">3.2</a></li>
    36913690                        <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.3">3.2</a></li>
     
    36933692                        <li><em>Section 3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.4">3.2</a></li>
    36943693                        <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.6">4.1</a></li>
    3695                         <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.10">7.3</a></li>
     3694                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.10">4.3.3</a></li>
    36963695                        <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.8">4.1</a></li>
    36973696                     </ul>
    36983697                  </li>
    3699                   <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">3.2</a>, <a href="#rfc.xref.Part5.2">3.2</a>, <a href="#rfc.xref.Part5.3">3.3</a>, <a href="#rfc.xref.Part5.4">4.1</a>, <a href="#rfc.xref.Part5.5">4.1</a>, <a href="#rfc.xref.Part5.6">4.1</a>, <a href="#rfc.xref.Part5.7">6.3</a>, <a href="#Part5"><b>13.1</b></a><ul>
     3698                  <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">3.2</a>, <a href="#rfc.xref.Part5.2">3.2</a>, <a href="#rfc.xref.Part5.3">3.3</a>, <a href="#rfc.xref.Part5.4">4.1</a>, <a href="#rfc.xref.Part5.5">4.1</a>, <a href="#rfc.xref.Part5.6">4.1</a>, <a href="#rfc.xref.Part5.7">6.3</a>, <a href="#Part5"><b>12.1</b></a><ul>
    37003699                        <li><em>Section 3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.4">4.1</a></li>
    37013700                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.5">4.1</a></li>
     
    37063705                     </ul>
    37073706                  </li>
    3708                   <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">2.2.1</a>, <a href="#rfc.xref.Part6.2">3.1</a>, <a href="#rfc.xref.Part6.3">3.3</a>, <a href="#rfc.xref.Part6.4">3.3</a>, <a href="#rfc.xref.Part6.5">4.2.1</a>, <a href="#rfc.xref.Part6.6">6.3</a>, <a href="#rfc.xref.Part6.7">6.4</a>, <a href="#rfc.xref.Part6.8">6.5</a>, <a href="#rfc.xref.Part6.9">6.6</a>, <a href="#rfc.xref.Part6.10">6.7</a>, <a href="#rfc.xref.Part6.11">7.2.1</a>, <a href="#rfc.xref.Part6.12">7.2.4</a>, <a href="#rfc.xref.Part6.13">7.2.4</a>, <a href="#rfc.xref.Part6.14">7.2.4</a>, <a href="#rfc.xref.Part6.15">7.3.1</a>, <a href="#rfc.xref.Part6.16">7.3.2</a>, <a href="#rfc.xref.Part6.17">7.4.9</a>, <a href="#Part6"><b>13.1</b></a><ul>
    3709                         <li><em>Section 2.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.8">6.5</a></li>
    3710                         <li><em>Section 2.3.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.11">7.2.1</a>, <a href="#rfc.xref.Part6.14">7.2.4</a>, <a href="#rfc.xref.Part6.15">7.3.1</a>, <a href="#rfc.xref.Part6.16">7.3.2</a>, <a href="#rfc.xref.Part6.17">7.4.9</a></li>
    3711                         <li><em>Section 2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.7">6.4</a></li>
    3712                         <li><em>Section 2.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.9">6.6</a>, <a href="#rfc.xref.Part6.10">6.7</a></li>
     3707                  <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">2.2.1</a>, <a href="#rfc.xref.Part6.2">3.1</a>, <a href="#rfc.xref.Part6.3">3.3</a>, <a href="#rfc.xref.Part6.4">3.3</a>, <a href="#rfc.xref.Part6.5">4.2.1</a>, <a href="#rfc.xref.Part6.6">4.3.2.1</a>, <a href="#rfc.xref.Part6.7">4.3.2.4</a>, <a href="#rfc.xref.Part6.8">4.3.2.4</a>, <a href="#rfc.xref.Part6.9">4.3.2.4</a>, <a href="#rfc.xref.Part6.10">4.3.3.1</a>, <a href="#rfc.xref.Part6.11">4.3.3.2</a>, <a href="#rfc.xref.Part6.12">4.3.4.9</a>, <a href="#rfc.xref.Part6.13">6.3</a>, <a href="#rfc.xref.Part6.14">6.4</a>, <a href="#rfc.xref.Part6.15">6.5</a>, <a href="#rfc.xref.Part6.16">6.6</a>, <a href="#rfc.xref.Part6.17">6.7</a>, <a href="#Part6"><b>12.1</b></a><ul>
     3708                        <li><em>Section 2.3.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.6">4.3.2.1</a>, <a href="#rfc.xref.Part6.9">4.3.2.4</a>, <a href="#rfc.xref.Part6.10">4.3.3.1</a>, <a href="#rfc.xref.Part6.11">4.3.3.2</a>, <a href="#rfc.xref.Part6.12">4.3.4.9</a></li>
     3709                        <li><em>Section 2.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.15">6.5</a></li>
     3710                        <li><em>Section 2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.14">6.4</a></li>
     3711                        <li><em>Section 2.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.16">6.6</a>, <a href="#rfc.xref.Part6.17">6.7</a></li>
    37133712                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.3">3.3</a></li>
    3714                         <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.12">7.2.4</a></li>
     3713                        <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.7">4.3.2.4</a></li>
    37153714                        <li><em>Section 3.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.4">3.3</a></li>
    3716                         <li><em>Section 3.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.13">7.2.4</a></li>
     3715                        <li><em>Section 3.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.8">4.3.2.4</a></li>
    37173716                     </ul>
    37183717                  </li>
    3719                   <li><em>Part7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.1">3.2</a>, <a href="#rfc.xref.Part7.2">3.2</a>, <a href="#rfc.xref.Part7.3">3.3</a>, <a href="#rfc.xref.Part7.4">3.3</a>, <a href="#rfc.xref.Part7.5">4.1</a>, <a href="#rfc.xref.Part7.6">4.1</a>, <a href="#rfc.xref.Part7.7">4.1</a>, <a href="#Part7"><b>13.1</b></a><ul>
     3718                  <li><em>Part7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.1">3.2</a>, <a href="#rfc.xref.Part7.2">3.2</a>, <a href="#rfc.xref.Part7.3">3.3</a>, <a href="#rfc.xref.Part7.4">3.3</a>, <a href="#rfc.xref.Part7.5">4.1</a>, <a href="#rfc.xref.Part7.6">4.1</a>, <a href="#rfc.xref.Part7.7">4.1</a>, <a href="#Part7"><b>12.1</b></a><ul>
    37203719                        <li><em>Section 3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.5">4.1</a></li>
    37213720                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.6">4.1</a></li>
     
    37273726                     </ul>
    37283727                  </li>
    3729                   <li>POST method&nbsp;&nbsp;<a href="#rfc.xref.POST.1">2.1</a>, <a href="#rfc.iref.p.1"><b>6.5</b></a>, <a href="#rfc.xref.POST.2">10.1</a>, <a href="#rfc.xref.POST.3">A</a></li>
    3730                   <li>PUT method&nbsp;&nbsp;<a href="#rfc.xref.PUT.1">2.1</a>, <a href="#rfc.iref.p.2"><b>6.6</b></a>, <a href="#rfc.xref.PUT.2">10.1</a>, <a href="#rfc.xref.PUT.3">A</a></li>
     3728                  <li>POST method&nbsp;&nbsp;<a href="#rfc.xref.POST.1">2.1</a>, <a href="#rfc.iref.p.1"><b>6.5</b></a>, <a href="#rfc.xref.POST.2">9.1</a>, <a href="#rfc.xref.POST.3">A</a></li>
     3729                  <li>PUT method&nbsp;&nbsp;<a href="#rfc.xref.PUT.1">2.1</a>, <a href="#rfc.iref.p.2"><b>6.6</b></a>, <a href="#rfc.xref.PUT.2">9.1</a>, <a href="#rfc.xref.PUT.3">A</a></li>
    37313730               </ul>
    37323731            </li>
    37333732            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
    3734                   <li>Referer header field&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.r.1"><b>9.7</b></a>, <a href="#rfc.xref.header.referer.2">10.3</a>, <a href="#rfc.xref.header.referer.3">A</a></li>
    3735                   <li>Retry-After header field&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">7.5.4</a>, <a href="#rfc.iref.r.2"><b>9.8</b></a>, <a href="#rfc.xref.header.retry-after.3">10.3</a></li>
    3736                   <li><em>RFC1123</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.1">8.1</a>, <a href="#rfc.xref.RFC1123.2">8.1</a>, <a href="#RFC1123"><b>13.2</b></a><ul>
    3737                         <li><em>Section 5.2.14</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.2">8.1</a></li>
     3733                  <li>Referer header field&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.r.1"><b>8.7</b></a>, <a href="#rfc.xref.header.referer.2">9.3</a>, <a href="#rfc.xref.header.referer.3">A</a></li>
     3734                  <li>Retry-After header field&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.3.5.4</a>, <a href="#rfc.iref.r.2"><b>8.8</b></a>, <a href="#rfc.xref.header.retry-after.3">9.3</a></li>
     3735                  <li><em>RFC1123</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.1">7.1</a>, <a href="#rfc.xref.RFC1123.2">7.1</a>, <a href="#RFC1123"><b>12.2</b></a><ul>
     3736                        <li><em>Section 5.2.14</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.2">7.1</a></li>
    37383737                     </ul>
    37393738                  </li>
    3740                   <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3</a>, <a href="#RFC1945"><b>13.2</b></a><ul>
    3741                         <li><em>Section 9.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3</a></li>
     3739                  <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">4.3.3</a>, <a href="#RFC1945"><b>12.2</b></a><ul>
     3740                        <li><em>Section 9.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">4.3.3</a></li>
    37423741                     </ul>
    37433742                  </li>
    3744                   <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a>, <a href="#rfc.xref.RFC2068.2">7.3</a>, <a href="#RFC2068"><b>13.2</b></a><ul>
    3745                         <li><em>Section 10.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">7.3</a></li>
    3746                         <li><em>Section 10.3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a></li>
     3743                  <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">4.3.3</a>, <a href="#rfc.xref.RFC2068.2">4.3.3</a>, <a href="#RFC2068"><b>12.2</b></a><ul>
     3744                        <li><em>Section 10.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">4.3.3</a></li>
     3745                        <li><em>Section 10.3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">4.3.3</a></li>
    37473746                     </ul>
    37483747                  </li>
    3749                   <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>13.1</b></a></li>
    3750                   <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">7.3</a>, <a href="#RFC2616"><b>13.2</b></a>, <a href="#rfc.xref.RFC2616.3">C.1</a><ul>
    3751                         <li><em>Section 10.3.8</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.2">7.3</a></li>
     3748                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>12.1</b></a></li>
     3749                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">4.3.3</a>, <a href="#RFC2616"><b>12.2</b></a>, <a href="#rfc.xref.RFC2616.3">C.1</a><ul>
     3750                        <li><em>Section 10.3.8</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.2">4.3.3</a></li>
    37523751                     </ul>
    37533752                  </li>
    3754                   <li><em>RFC2817</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">10.2</a>, <a href="#RFC2817"><b>13.2</b></a>, <a href="#rfc.xref.RFC2817.2">A</a>, <a href="#rfc.xref.RFC2817.3">A</a>, <a href="#rfc.xref.RFC2817.4">A</a><ul>
    3755                         <li><em>Section 7.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">10.2</a>, <a href="#rfc.xref.RFC2817.2">A</a></li>
     3753                  <li><em>RFC2817</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">9.2</a>, <a href="#RFC2817"><b>12.2</b></a>, <a href="#rfc.xref.RFC2817.2">A</a>, <a href="#rfc.xref.RFC2817.3">A</a>, <a href="#rfc.xref.RFC2817.4">A</a><ul>
     3754                        <li><em>Section 7.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">9.2</a>, <a href="#rfc.xref.RFC2817.2">A</a></li>
    37563755                     </ul>
    37573756                  </li>
    3758                   <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">3.1</a>, <a href="#rfc.xref.RFC3864.2">3.1</a>, <a href="#rfc.xref.RFC3864.3">10.3</a>, <a href="#RFC3864"><b>13.2</b></a><ul>
     3757                  <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">3.1</a>, <a href="#rfc.xref.RFC3864.2">3.1</a>, <a href="#rfc.xref.RFC3864.3">9.3</a>, <a href="#RFC3864"><b>12.2</b></a><ul>
    37593758                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.2">3.1</a></li>
    37603759                     </ul>
    37613760                  </li>
    3762                   <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">9.5</a>, <a href="#rfc.xref.RFC3986.2">9.5</a>, <a href="#RFC3986"><b>13.1</b></a><ul>
    3763                         <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">9.5</a></li>
    3764                         <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.2">9.5</a></li>
     3761                  <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">8.5</a>, <a href="#rfc.xref.RFC3986.2">8.5</a>, <a href="#RFC3986"><b>12.1</b></a><ul>
     3762                        <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">8.5</a></li>
     3763                        <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.2">8.5</a></li>
    37653764                     </ul>
    37663765                  </li>
    3767                   <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a>, <a href="#RFC5226"><b>13.2</b></a><ul>
     3766                  <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a>, <a href="#RFC5226"><b>12.2</b></a><ul>
    37683767                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a></li>
    37693768                     </ul>
    37703769                  </li>
    3771                   <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">1.2</a>, <a href="#rfc.xref.RFC5234.2">1.2</a>, <a href="#rfc.xref.RFC5234.3">3.1</a>, <a href="#RFC5234"><b>13.1</b></a><ul>
     3770                  <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">1.2</a>, <a href="#rfc.xref.RFC5234.2">1.2</a>, <a href="#rfc.xref.RFC5234.3">3.1</a>, <a href="#RFC5234"><b>12.1</b></a><ul>
    37723771                        <li><em>Appendix B.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.2">1.2</a></li>
    37733772                     </ul>
    37743773                  </li>
    3775                   <li><em>RFC5322</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">8.1</a>, <a href="#rfc.xref.RFC5322.2">9.2</a>, <a href="#rfc.xref.RFC5322.3">9.4</a>, <a href="#rfc.xref.RFC5322.4">9.4</a>, <a href="#RFC5322"><b>13.2</b></a><ul>
    3776                         <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">8.1</a></li>
    3777                         <li><em>Section 3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.3">9.4</a>, <a href="#rfc.xref.RFC5322.4">9.4</a></li>
    3778                         <li><em>Section 3.6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.2">9.2</a></li>
     3774                  <li><em>RFC5322</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">7.1</a>, <a href="#rfc.xref.RFC5322.2">8.2</a>, <a href="#rfc.xref.RFC5322.3">8.4</a>, <a href="#rfc.xref.RFC5322.4">8.4</a>, <a href="#RFC5322"><b>12.2</b></a><ul>
     3775                        <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">7.1</a></li>
     3776                        <li><em>Section 3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.3">8.4</a>, <a href="#rfc.xref.RFC5322.4">8.4</a></li>
     3777                        <li><em>Section 3.6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.2">8.2</a></li>
    37793778                     </ul>
    37803779                  </li>
    3781                   <li><em>RFC5789</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5789.1">6.6</a>, <a href="#RFC5789"><b>13.2</b></a></li>
    3782                   <li><em>RFC5987</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5987.1">3.1</a>, <a href="#RFC5987"><b>13.2</b></a></li>
     3780                  <li><em>RFC5789</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5789.1">6.6</a>, <a href="#RFC5789"><b>12.2</b></a></li>
     3781                  <li><em>RFC5987</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5987.1">3.1</a>, <a href="#RFC5987"><b>12.2</b></a></li>
    37833782               </ul>
    37843783            </li>
    37853784            <li><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul>
    3786                   <li>Safe Methods&nbsp;&nbsp;<a href="#rfc.iref.s.1"><b>6.1.1</b></a></li>
    3787                   <li>Server header field&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.s.38"><b>9.9</b></a>, <a href="#rfc.xref.header.server.2">10.3</a>, <a href="#rfc.xref.header.server.3">11.1</a>, <a href="#rfc.xref.header.server.4">A</a></li>
     3785                  <li>Safe Methods&nbsp;&nbsp;<a href="#rfc.iref.s.37"><b>6.1.1</b></a></li>
     3786                  <li>Server header field&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.s.38"><b>8.9</b></a>, <a href="#rfc.xref.header.server.2">9.3</a>, <a href="#rfc.xref.header.server.3">10.1</a>, <a href="#rfc.xref.header.server.4">A</a></li>
    37883787                  <li>Status Codes&nbsp;&nbsp;
    37893788                     <ul>
    3790                         <li>100 Continue&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.s.2"><b>7.1.1</b></a>, <a href="#rfc.xref.status.100.2">10.2</a></li>
    3791                         <li>101 Switching Protocols&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.s.3"><b>7.1.2</b></a>, <a href="#rfc.xref.status.101.2">10.2</a></li>
    3792                         <li>200 OK&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.s.4"><b>7.2.1</b></a>, <a href="#rfc.xref.status.200.2">10.2</a></li>
    3793                         <li>201 Created&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.s.5"><b>7.2.2</b></a>, <a href="#rfc.xref.status.201.2">10.2</a></li>
    3794                         <li>202 Accepted&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.s.6"><b>7.2.3</b></a>, <a href="#rfc.xref.status.202.2">10.2</a></li>
    3795                         <li>203 Non-Authoritative Information&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.s.7"><b>7.2.4</b></a>, <a href="#rfc.xref.status.203.2">10.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
    3796                         <li>204 No Content&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.s.8"><b>7.2.5</b></a>, <a href="#rfc.xref.status.204.2">10.2</a></li>
    3797                         <li>205 Reset Content&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.s.9"><b>7.2.6</b></a>, <a href="#rfc.xref.status.205.2">10.2</a></li>
    3798                         <li>300 Multiple Choices&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.s.10"><b>7.3.1</b></a>, <a href="#rfc.xref.status.300.2">10.2</a></li>
    3799                         <li>301 Moved Permanently&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.s.11"><b>7.3.2</b></a>, <a href="#rfc.xref.status.301.2">10.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
    3800                         <li>302 Found&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.s.12"><b>7.3.3</b></a>, <a href="#rfc.xref.status.302.2">10.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
    3801                         <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.s.13"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.2">10.2</a></li>
    3802                         <li>305 Use Proxy&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.s.14"><b>7.3.5</b></a>, <a href="#rfc.xref.status.305.2">10.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
    3803                         <li>306 (Unused)&nbsp;&nbsp;<a href="#rfc.iref.s.15"><b>7.3.6</b></a>, <a href="#rfc.xref.status.306.1">10.2</a></li>
    3804                         <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.s.16"><b>7.3.7</b></a>, <a href="#rfc.xref.status.307.2">10.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
    3805                         <li>400 Bad Request&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.s.17"><b>7.4.1</b></a>, <a href="#rfc.xref.status.400.2">10.2</a></li>
    3806                         <li>402 Payment Required&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.s.18"><b>7.4.2</b></a>, <a href="#rfc.xref.status.402.2">10.2</a></li>
    3807                         <li>403 Forbidden&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.s.19"><b>7.4.3</b></a>, <a href="#rfc.xref.status.403.2">10.2</a></li>
    3808                         <li>404 Not Found&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.s.20"><b>7.4.4</b></a>, <a href="#rfc.xref.status.404.2">10.2</a></li>
    3809                         <li>405 Method Not Allowed&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.s.21"><b>7.4.5</b></a>, <a href="#rfc.xref.status.405.2">10.2</a></li>
    3810                         <li>406 Not Acceptable&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.s.22"><b>7.4.6</b></a>, <a href="#rfc.xref.status.406.2">10.2</a></li>
    3811                         <li>408 Request Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.s.23"><b>7.4.7</b></a>, <a href="#rfc.xref.status.408.2">10.2</a></li>
    3812                         <li>409 Conflict&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.s.24"><b>7.4.8</b></a>, <a href="#rfc.xref.status.409.2">10.2</a></li>
    3813                         <li>410 Gone&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.s.25"><b>7.4.9</b></a>, <a href="#rfc.xref.status.410.2">10.2</a></li>
    3814                         <li>411 Length Required&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.s.26"><b>7.4.10</b></a>, <a href="#rfc.xref.status.411.2">10.2</a></li>
    3815                         <li>413 Request Representation Too Large&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.s.27"><b>7.4.11</b></a>, <a href="#rfc.xref.status.413.2">10.2</a></li>
    3816                         <li>414 URI Too Long&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.s.28"><b>7.4.12</b></a>, <a href="#rfc.xref.status.414.2">10.2</a></li>
    3817                         <li>415 Unsupported Media Type&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.s.29"><b>7.4.13</b></a>, <a href="#rfc.xref.status.415.2">10.2</a></li>
    3818                         <li>417 Expectation Failed&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.s.30"><b>7.4.14</b></a>, <a href="#rfc.xref.status.417.2">10.2</a></li>
    3819                         <li>426 Upgrade Required&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.s.31"><b>7.4.15</b></a>, <a href="#rfc.xref.status.426.2">10.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
    3820                         <li>500 Internal Server Error&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.s.32"><b>7.5.1</b></a>, <a href="#rfc.xref.status.500.2">10.2</a></li>
    3821                         <li>501 Not Implemented&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.s.33"><b>7.5.2</b></a>, <a href="#rfc.xref.status.501.2">10.2</a></li>
    3822                         <li>502 Bad Gateway&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.s.34"><b>7.5.3</b></a>, <a href="#rfc.xref.status.502.2">10.2</a></li>
    3823                         <li>503 Service Unavailable&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.s.35"><b>7.5.4</b></a>, <a href="#rfc.xref.status.503.2">10.2</a></li>
    3824                         <li>504 Gateway Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.s.36"><b>7.5.5</b></a>, <a href="#rfc.xref.status.504.2">10.2</a></li>
    3825                         <li>505 HTTP Version Not Supported&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.s.37"><b>7.5.6</b></a>, <a href="#rfc.xref.status.505.2">10.2</a></li>
     3789                        <li>100 Continue&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.s.1"><b>4.3.1.1</b></a>, <a href="#rfc.xref.status.100.2">9.2</a></li>
     3790                        <li>101 Switching Protocols&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.s.2"><b>4.3.1.2</b></a>, <a href="#rfc.xref.status.101.2">9.2</a></li>
     3791                        <li>200 OK&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.s.3"><b>4.3.2.1</b></a>, <a href="#rfc.xref.status.200.2">9.2</a></li>
     3792                        <li>201 Created&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.s.4"><b>4.3.2.2</b></a>, <a href="#rfc.xref.status.201.2">9.2</a></li>
     3793                        <li>202 Accepted&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.s.5"><b>4.3.2.3</b></a>, <a href="#rfc.xref.status.202.2">9.2</a></li>
     3794                        <li>203 Non-Authoritative Information&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.s.6"><b>4.3.2.4</b></a>, <a href="#rfc.xref.status.203.2">9.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
     3795                        <li>204 No Content&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.s.7"><b>4.3.2.5</b></a>, <a href="#rfc.xref.status.204.2">9.2</a></li>
     3796                        <li>205 Reset Content&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.s.8"><b>4.3.2.6</b></a>, <a href="#rfc.xref.status.205.2">9.2</a></li>
     3797                        <li>300 Multiple Choices&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.s.9"><b>4.3.3.1</b></a>, <a href="#rfc.xref.status.300.2">9.2</a></li>
     3798                        <li>301 Moved Permanently&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.s.10"><b>4.3.3.2</b></a>, <a href="#rfc.xref.status.301.2">9.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
     3799                        <li>302 Found&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.s.11"><b>4.3.3.3</b></a>, <a href="#rfc.xref.status.302.2">9.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
     3800                        <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.s.12"><b>4.3.3.4</b></a>, <a href="#rfc.xref.status.303.2">9.2</a></li>
     3801                        <li>305 Use Proxy&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.s.13"><b>4.3.3.5</b></a>, <a href="#rfc.xref.status.305.2">9.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
     3802                        <li>306 (Unused)&nbsp;&nbsp;<a href="#rfc.iref.s.14"><b>4.3.3.6</b></a>, <a href="#rfc.xref.status.306.1">9.2</a></li>
     3803                        <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.s.15"><b>4.3.3.7</b></a>, <a href="#rfc.xref.status.307.2">9.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
     3804                        <li>400 Bad Request&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.s.16"><b>4.3.4.1</b></a>, <a href="#rfc.xref.status.400.2">9.2</a></li>
     3805                        <li>402 Payment Required&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.s.17"><b>4.3.4.2</b></a>, <a href="#rfc.xref.status.402.2">9.2</a></li>
     3806                        <li>403 Forbidden&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.s.18"><b>4.3.4.3</b></a>, <a href="#rfc.xref.status.403.2">9.2</a></li>
     3807                        <li>404 Not Found&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.s.19"><b>4.3.4.4</b></a>, <a href="#rfc.xref.status.404.2">9.2</a></li>
     3808                        <li>405 Method Not Allowed&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.s.20"><b>4.3.4.5</b></a>, <a href="#rfc.xref.status.405.2">9.2</a></li>
     3809                        <li>406 Not Acceptable&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.s.21"><b>4.3.4.6</b></a>, <a href="#rfc.xref.status.406.2">9.2</a></li>
     3810                        <li>408 Request Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.s.22"><b>4.3.4.7</b></a>, <a href="#rfc.xref.status.408.2">9.2</a></li>
     3811                        <li>409 Conflict&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.s.23"><b>4.3.4.8</b></a>, <a href="#rfc.xref.status.409.2">9.2</a></li>
     3812                        <li>410 Gone&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.s.24"><b>4.3.4.9</b></a>, <a href="#rfc.xref.status.410.2">9.2</a></li>
     3813                        <li>411 Length Required&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.s.25"><b>4.3.4.10</b></a>, <a href="#rfc.xref.status.411.2">9.2</a></li>
     3814                        <li>413 Request Representation Too Large&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.s.26"><b>4.3.4.11</b></a>, <a href="#rfc.xref.status.413.2">9.2</a></li>
     3815                        <li>414 URI Too Long&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.s.27"><b>4.3.4.12</b></a>, <a href="#rfc.xref.status.414.2">9.2</a></li>
     3816                        <li>415 Unsupported Media Type&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.s.28"><b>4.3.4.13</b></a>, <a href="#rfc.xref.status.415.2">9.2</a></li>
     3817                        <li>417 Expectation Failed&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.s.29"><b>4.3.4.14</b></a>, <a href="#rfc.xref.status.417.2">9.2</a></li>
     3818                        <li>426 Upgrade Required&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.s.30"><b>4.3.4.15</b></a>, <a href="#rfc.xref.status.426.2">9.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
     3819                        <li>500 Internal Server Error&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.s.31"><b>4.3.5.1</b></a>, <a href="#rfc.xref.status.500.2">9.2</a></li>
     3820                        <li>501 Not Implemented&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.s.32"><b>4.3.5.2</b></a>, <a href="#rfc.xref.status.501.2">9.2</a></li>
     3821                        <li>502 Bad Gateway&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.s.33"><b>4.3.5.3</b></a>, <a href="#rfc.xref.status.502.2">9.2</a></li>
     3822                        <li>503 Service Unavailable&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.s.34"><b>4.3.5.4</b></a>, <a href="#rfc.xref.status.503.2">9.2</a></li>
     3823                        <li>504 Gateway Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.s.35"><b>4.3.5.5</b></a>, <a href="#rfc.xref.status.504.2">9.2</a></li>
     3824                        <li>505 HTTP Version Not Supported&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.s.36"><b>4.3.5.6</b></a>, <a href="#rfc.xref.status.505.2">9.2</a></li>
    38263825                     </ul>
    38273826                  </li>
     
    38293828            </li>
    38303829            <li><a id="rfc.index.T" href="#rfc.index.T"><b>T</b></a><ul>
    3831                   <li>TRACE method&nbsp;&nbsp;<a href="#rfc.xref.TRACE.1">2.1</a>, <a href="#rfc.iref.t.1"><b>6.8</b></a>, <a href="#rfc.xref.TRACE.2">9.6</a>, <a href="#rfc.xref.TRACE.3">10.1</a>, <a href="#rfc.xref.TRACE.4">11.1</a></li>
     3830                  <li>TRACE method&nbsp;&nbsp;<a href="#rfc.xref.TRACE.1">2.1</a>, <a href="#rfc.iref.t.1"><b>6.8</b></a>, <a href="#rfc.xref.TRACE.2">8.6</a>, <a href="#rfc.xref.TRACE.3">9.1</a>, <a href="#rfc.xref.TRACE.4">10.1</a></li>
    38323831               </ul>
    38333832            </li>
    38343833            <li><a id="rfc.index.U" href="#rfc.index.U"><b>U</b></a><ul>
    3835                   <li>User-Agent header field&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.iref.u.1"><b>9.10</b></a>, <a href="#rfc.xref.header.user-agent.2">10.3</a>, <a href="#rfc.xref.header.user-agent.3">11.1</a></li>
     3834                  <li>User-Agent header field&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.iref.u.1"><b>8.10</b></a>, <a href="#rfc.xref.header.user-agent.2">9.3</a>, <a href="#rfc.xref.header.user-agent.3">10.1</a></li>
    38363835               </ul>
    38373836            </li>
  • draft-ietf-httpbis/latest/p2-semantics.xml

    r1617 r1618  
    596596   information which will explain the unusual status.
    597597</t>
     598<t>
     599   The first digit of the status-code defines the class of response. The
     600   last two digits do not have any categorization role. There are 5
     601   values for the first digit:
     602  <list style="symbols">
     603    <t>
     604      1xx: Informational - Request received, continuing process
     605    </t>
     606    <t>
     607      2xx: Success - The action was successfully received,
     608        understood, and accepted
     609    </t>
     610    <t>
     611      3xx: Redirection - Further action needs to be taken in order to
     612        complete the request
     613    </t>
     614    <t>
     615      4xx: Client Error - The request contains bad syntax or cannot
     616        be fulfilled
     617    </t>
     618    <t>
     619      5xx: Server Error - The server failed to fulfill an apparently
     620        valid request
     621    </t>
     622  </list>
     623</t>
    598624
    599625<section title="Overview of Status Codes" anchor="overview.of.status.codes">
     
    713739</section>
    714740
    715 </section>
    716 
    717 <section title="Representation" anchor="representation">
    718 <t>
    719    Request and Response messages &MAY; transfer a representation if not otherwise
    720    restricted by the request method or response status code. A representation
    721    consists of metadata (representation header fields) and data (representation
    722    body).  When a complete or partial representation is enclosed in an HTTP message,
    723    it is referred to as the payload of the message. HTTP representations
    724    are defined in &payload;.
    725 </t>
    726 <t>
    727    A representation body is only present in a message when a message body is
    728    present, as described in &message-body;. The representation body is obtained
    729    from the message body by decoding any Transfer-Encoding that might
    730    have been applied to ensure safe and proper transfer of the message.
    731 </t>
    732 
    733 <section title="Identifying the Resource Associated with a Representation" anchor="identifying.response.associated.with.representation">
    734 <t>
    735    It is sometimes necessary to determine an identifier for the resource
    736    associated with a representation.
    737 </t>
    738 <t>
    739    An HTTP request representation, when present, is always associated with an
    740    anonymous (i.e., unidentified) resource.
    741 </t>
    742 <t>
    743    In the common case, an HTTP response is a representation of the target
    744    resource (see &effective-request-uri;). However, this is not always the
    745    case. To determine the URI of the resource a response is associated with,
    746    the following rules are used (with the first applicable one being selected):
    747 </t>
    748 <t><list style="numbers">
    749    <t>If the response status code is 200 or 203 and the request method was GET,
    750    the response payload is a representation of the target resource.</t>
    751    <t>If the response status code is 204, 206, or 304 and the request method was GET
    752    or HEAD, the response payload is a partial representation of the target
    753    resource.</t>
    754    <t>If the response has a Content-Location header field, and that URI is the same
    755    as the effective request URI, the response payload is a representation of the
    756    target resource.</t>
    757    <t>If the response has a Content-Location header field, and that URI is not the
    758    same as the effective request URI, then the response asserts that its
    759    payload is a representation of the resource identified by the
    760    Content-Location URI. However, such an assertion cannot be trusted unless
    761    it can be verified by other means (not defined by HTTP).</t>
    762    <t>Otherwise, the response is a representation of an anonymous (i.e.,
    763    unidentified) resource.</t>
    764 </list></t>
    765 <t>
    766   <cref anchor="TODO-req-uri">
    767    The comparison function is going to have to be defined somewhere,
    768    because we already need to compare URIs for things like cache invalidation.</cref>
    769 </t>
    770 </section>
    771 
    772 </section>
    773 
    774 
    775 <section title="Method Definitions" anchor="method.definitions">
    776 <t>
    777    The set of common request methods for HTTP/1.1 is defined below. Although
    778    this set can be expanded, additional methods cannot be assumed to
    779    share the same semantics for separately extended clients and servers.
    780 </t>
    781 
    782 <section title="Safe and Idempotent Methods" anchor="safe.and.idempotent">
    783 
    784 <section title="Safe Methods" anchor="safe.methods">
    785 <iref item="Safe Methods" primary="true"/>
    786 <t>
    787    Implementors need to be aware that the software represents the user in
    788    their interactions over the Internet, and need to allow
    789    the user to be aware of any actions they take which might have an
    790    unexpected significance to themselves or others.
    791 </t>
    792 <t>
    793    In particular, the convention has been established that the GET, HEAD,
    794    OPTIONS, and TRACE request methods &SHOULD-NOT; have the significance
    795    of taking an action other than retrieval. These request methods ought
    796    to be considered "<x:dfn anchor="safe">safe</x:dfn>".
    797    This allows user agents to represent other methods, such as POST, PUT
    798    and DELETE, in a special way, so that the user is made aware of the
    799    fact that a possibly unsafe action is being requested.
    800 </t>
    801 <t>
    802    Naturally, it is not possible to ensure that the server does not
    803    generate side-effects as a result of performing a GET request; in
    804    fact, some dynamic resources consider that a feature. The important
    805    distinction here is that the user did not request the side-effects,
    806    so therefore cannot be held accountable for them.
    807 </t>
    808 </section>
    809 
    810 <section title="Idempotent Methods" anchor="idempotent.methods">
    811 <iref item="Idempotent Methods" primary="true"/>
    812 <t>
    813    Request methods can also have the property of "idempotence" in that,
    814    aside from error or expiration issues, the intended effect of multiple
    815    identical requests is the same as for a single request.
    816    PUT, DELETE, and all safe request methods are idempotent.
    817    It is important to note that idempotence refers only to changes
    818    requested by the client: a server is free to change its state due
    819    to multiple requests for the purpose of tracking those requests,
    820    versioning of results, etc.
    821 </t>
    822 </section>
    823 </section>
    824 
    825 <section title="OPTIONS" anchor="OPTIONS">
    826   <rdf:Description>
    827     <safe xmlns="urn:ietf:id:draft-ietf-httpbis-p2-semantics#">yes</safe>
    828   </rdf:Description>
    829   <iref primary="true" item="OPTIONS method" x:for-anchor=""/>
    830   <iref primary="true" item="Methods" subitem="OPTIONS" x:for-anchor=""/>
    831 <t>
    832    The OPTIONS method requests information about the
    833    communication options available on the request/response chain
    834    identified by the effective request URI. This method allows a client to
    835    determine the options and/or requirements associated with a resource,
    836    or the capabilities of a server, without implying a resource action
    837    or initiating a resource retrieval.
    838 </t>
    839 <t>
    840    Responses to the OPTIONS method are not cacheable.
    841 </t>
    842 <t>
    843    If the OPTIONS request includes a message body (as indicated by the
    844    presence of Content-Length or Transfer-Encoding), then the media type
    845    &MUST; be indicated by a Content-Type field. Although this
    846    specification does not define any use for such a body, future
    847    extensions to HTTP might use the OPTIONS body to make more detailed
    848    queries on the server.
    849 </t>
    850 <t>
    851    If the request-target (&request-target;) is an asterisk ("*"),
    852    the OPTIONS request is
    853    intended to apply to the server in general rather than to a specific
    854    resource. Since a server's communication options typically depend on
    855    the resource, the "*" request is only useful as a "ping" or "no-op"
    856    type of method; it does nothing beyond allowing the client to test
    857    the capabilities of the server. For example, this can be used to test
    858    a proxy for HTTP/1.1 conformance (or lack thereof).
    859 </t>
    860 <t>
    861    If the request-target is not an asterisk, the OPTIONS request applies
    862    only to the options that are available when communicating with that
    863    resource.
    864 </t>
    865 <t>
    866    A 200 response &SHOULD; include any header fields that indicate
    867    optional features implemented by the server and applicable to that
    868    resource (e.g., Allow), possibly including extensions not defined by
    869    this specification. The response body, if any, &SHOULD; also include
    870    information about the communication options. The format for such a
    871    body is not defined by this specification, but might be defined by
    872    future extensions to HTTP. Content negotiation &MAY; be used to select
    873    the appropriate response format. If no response body is included, the
    874    response &MUST; include a Content-Length field with a field-value of
    875    "0".
    876 </t>
    877 <t>
    878    The Max-Forwards header field &MAY; be used to target a
    879    specific proxy in the request chain (see <xref target="header.max-forwards"/>).
    880    If no Max-Forwards field is present in the request, then the forwarded
    881    request &MUST-NOT; include a Max-Forwards field.
    882 </t>
    883 </section>
    884 
    885 <section title="GET" anchor="GET">
    886   <rdf:Description>
    887     <safe xmlns="urn:ietf:id:draft-ietf-httpbis-p2-semantics#">yes</safe>
    888   </rdf:Description>
    889   <iref primary="true" item="GET method" x:for-anchor=""/>
    890   <iref primary="true" item="Methods" subitem="GET" x:for-anchor=""/>
    891 <t>
    892    The GET method requests transfer of a current representation of
    893    the target resource.
    894 </t>
    895 <t>   
    896    If the target resource is a data-producing process, it is the
    897    produced data which shall be returned as the representation in the response and not
    898    the source text of the process, unless that text happens to be the output of
    899    the process.
    900 </t>
    901 <t>
    902    The semantics of the GET method change to a "conditional GET" if the
    903    request message includes an If-Modified-Since, If-Unmodified-Since,
    904    If-Match, If-None-Match, or If-Range header field. A conditional GET
    905    requests that the representation be transferred only under the
    906    circumstances described by the conditional header field(s). The
    907    conditional GET request is intended to reduce unnecessary network
    908    usage by allowing cached representations to be refreshed without requiring
    909    multiple requests or transferring data already held by the client.
    910 </t>
    911 <t>
    912    The semantics of the GET method change to a "partial GET" if the
    913    request message includes a Range header field. A partial GET requests
    914    that only part of the representation be transferred, as described in &header-range;.
    915    The partial GET request is intended to reduce unnecessary
    916    network usage by allowing partially-retrieved representations to be
    917    completed without transferring data already held by the client.
    918 </t>
    919 <t>
    920    Bodies on GET requests have no defined semantics. Note that sending a body
    921    on a GET request might cause some existing implementations to reject the
    922    request.
    923 </t>
    924 <t>
    925    The response to a GET request is cacheable and &MAY; be used to satisfy
    926    subsequent GET and HEAD requests (see &caching;).
    927 </t>
    928 <t>
    929    See <xref target="encoding.sensitive.information.in.uris"/> for security considerations when used for forms.
    930 </t>
    931 </section>
    932 
    933 <section title="HEAD" anchor="HEAD">
    934   <rdf:Description>
    935     <safe xmlns="urn:ietf:id:draft-ietf-httpbis-p2-semantics#">yes</safe>
    936   </rdf:Description>
    937   <iref primary="true" item="HEAD method" x:for-anchor=""/>
    938   <iref primary="true" item="Methods" subitem="HEAD" x:for-anchor=""/>
    939 <t>
    940    The HEAD method is identical to GET except that the server &MUST-NOT;
    941    return a message body in the response. The metadata contained
    942    in the HTTP header fields in response to a HEAD request &SHOULD; be identical
    943    to the information sent in response to a GET request. This method can
    944    be used for obtaining metadata about the representation implied by the
    945    request without transferring the representation body. This method is
    946    often used for testing hypertext links for validity, accessibility,
    947    and recent modification.
    948 </t>
    949 <t>
    950    The response to a HEAD request is cacheable and &MAY; be used to satisfy
    951    a subsequent HEAD request. It also has potential side effects on
    952    previously stored responses to GET; see &p6-head;.
    953 </t>
    954 <t>
    955    Bodies on HEAD requests have no defined semantics. Note that sending a body
    956    on a HEAD request might cause some existing implementations to reject the
    957    request.
    958 </t>
    959 </section>
    960 
    961 <section title="POST" anchor="POST">
    962   <iref primary="true" item="POST method" x:for-anchor=""/>
    963   <iref primary="true" item="Methods" subitem="POST" x:for-anchor=""/>
    964 <t>
    965    The POST method requests that the origin server accept the
    966    representation enclosed in the request as data to be processed by the
    967    target resource. POST is designed to allow a uniform method to cover the
    968    following functions:
    969   <list style="symbols">
    970     <t>
    971       Annotation of existing resources;
    972     </t>
    973     <t>
    974         Posting a message to a bulletin board, newsgroup, mailing list,
    975         or similar group of articles;
    976     </t>
    977     <t>
    978         Providing a block of data, such as the result of submitting a
    979         form, to a data-handling process;
    980     </t>
    981     <t>
    982         Extending a database through an append operation.
    983     </t>
    984   </list>
    985 </t>
    986 <t>
    987    The actual function performed by the POST method is determined by the
    988    server and is usually dependent on the effective request URI.
    989 </t>
    990 <t>
    991    The action performed by the POST method might not result in a
    992    resource that can be identified by a URI. In this case, either 200
    993    (OK) or 204 (No Content) is the appropriate response status code,
    994    depending on whether or not the response includes a representation that
    995    describes the result.
    996 </t>
    997 <t>
    998    If a resource has been created on the origin server, the response
    999    &SHOULD; be 201 (Created) and contain a representation which describes the
    1000    status of the request and refers to the new resource, and a Location
    1001    header field (see <xref target="header.location"/>).
    1002 </t>
    1003 <t>
    1004    Responses to POST requests are only cacheable when they
    1005    include explicit freshness information (see &p6-explicit;). A
    1006    cached POST response with a Content-Location header field
    1007    (see &header-content-location;) whose value is the effective
    1008    Request URI &MAY; be used to satisfy subsequent GET and HEAD requests.
    1009 </t>
    1010 <t>
    1011    Note that POST caching is not widely implemented.
    1012    However, the 303 (See Other) response can be used to direct the
    1013    user agent to retrieve a cacheable representation of the resource.
    1014 </t>
    1015 </section>
    1016 
    1017 <section title="PUT" anchor="PUT">
    1018   <iref primary="true" item="PUT method" x:for-anchor=""/>
    1019   <iref primary="true" item="Methods" subitem="PUT" x:for-anchor=""/>
    1020 <t>
    1021    The PUT method requests that the state of the target resource
    1022    be created or replaced with the state defined by the representation
    1023    enclosed in the request message payload.  A successful PUT of a given
    1024    representation would suggest that a subsequent GET on that same target
    1025    resource will result in an equivalent representation being returned in
    1026    a 200 (OK) response.  However, there is no guarantee that such a state
    1027    change will be observable, since the target resource might be acted
    1028    upon by other user agents in parallel, or might be subject to dynamic
    1029    processing by the origin server, before any subsequent GET is received.
    1030    A successful response only implies that the user agent's intent was
    1031    achieved at the time of its processing by the origin server.
    1032 </t>
    1033 <t>   
    1034    If the target resource does not have a current representation and
    1035    the PUT successfully creates one, then the origin server &MUST; inform
    1036    the user agent by sending a 201 (Created) response.  If the target
    1037    resource does have a current representation and that representation is
    1038    successfully modified in accordance with the state of the enclosed
    1039    representation, then either a 200 (OK) or 204 (No Content) response
    1040    &SHOULD; be sent to indicate successful completion of the request.
    1041 </t>
    1042 <t>
    1043    Unrecognized header fields &SHOULD; be ignored (i.e., not saved
    1044    as part of the resource state).
    1045 </t>
    1046 <t>
    1047    An origin server &SHOULD; verify that the PUT representation is
    1048    consistent with any constraints which the server has for the target
    1049    resource that cannot or will not be changed by the PUT.  This is
    1050    particularly important when the origin server uses internal
    1051    configuration information related to the URI in order to set the
    1052    values for representation metadata on GET responses.  When a PUT
    1053    representation is inconsistent with the target resource, the origin
    1054    server &SHOULD; either make them consistent, by transforming the
    1055    representation or changing the resource configuration, or respond
    1056    with an appropriate error message containing sufficient information
    1057    to explain why the representation is unsuitable.  The 409 (Conflict)
    1058    or 415 (Unsupported Media Type) status codes are suggested, with the
    1059    latter being specific to constraints on Content-Type values.
    1060 </t>
    1061 <t>
    1062    For example, if the target resource is configured to always have a
    1063    Content-Type of "text/html" and the representation being PUT has a
    1064    Content-Type of "image/jpeg", then the origin server &SHOULD; do one of:
    1065    (a) reconfigure the target resource to reflect the new media type;
    1066    (b) transform the PUT representation to a format consistent with that
    1067    of the resource before saving it as the new resource state; or,
    1068    (c) reject the request with a 415 response indicating that the target
    1069    resource is limited to "text/html", perhaps including a link to a
    1070    different resource that would be a suitable target for the new
    1071    representation.
    1072 </t>
    1073 <t>
    1074    HTTP does not define exactly how a PUT method affects the state
    1075    of an origin server beyond what can be expressed by the intent of
    1076    the user agent request and the semantics of the origin server response.
    1077    It does not define what a resource might be, in any sense of that
    1078    word, beyond the interface provided via HTTP.  It does not define
    1079    how resource state is "stored", nor how such storage might change
    1080    as a result of a change in resource state, nor how the origin server
    1081    translates resource state into representations.  Generally speaking,
    1082    all implementation details behind the resource interface are
    1083    intentionally hidden by the server.
    1084 </t>
    1085 <t>
    1086    The fundamental difference between the POST and PUT methods is
    1087    highlighted by the different intent for the target resource.
    1088    The target resource in a POST request is intended to handle the
    1089    enclosed representation as a data-accepting process, such as for
    1090    a gateway to some other protocol or a document that accepts annotations.
    1091    In contrast, the target resource in a PUT request is intended to
    1092    take the enclosed representation as a new or replacement value.
    1093    Hence, the intent of PUT is idempotent and visible to intermediaries,
    1094    even though the exact effect is only known by the origin server.
    1095 </t>
    1096 <t>
    1097    Proper interpretation of a PUT request presumes that the user agent
    1098    knows what target resource is desired.  A service that is intended
    1099    to select a proper URI on behalf of the client, after receiving
    1100    a state-changing request, &SHOULD; be implemented using the POST
    1101    method rather than PUT.  If the origin server will not make the
    1102    requested PUT state change to the target resource and instead
    1103    wishes to have it applied to a different resource, such as when the
    1104    resource has been moved to a different URI, then the origin server
    1105    &MUST; send a 301 (Moved Permanently) response; the user agent &MAY;
    1106    then make its own decision regarding whether or not to redirect the
    1107    request.
    1108 </t>
    1109 <t>
    1110