Ignore:
Timestamp:
Mar 29, 2012, 4:28:19 AM (8 years ago)
Author:
julian.reschke@…
Message:

remove redundant ABNF, fix section title

File:
1 edited

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

    r1625 r1635  
    460460  }
    461461  @bottom-center {
    462        content: "Expires September 29, 2012";
     462       content: "Expires September 30, 2012";
    463463  }
    464464  @bottom-right {
     
    485485      <link rel="Chapter" title="2 Methods" href="#rfc.section.2">
    486486      <link rel="Chapter" title="3 Header Fields" href="#rfc.section.3">
    487       <link rel="Chapter" title="4 Status Code and Reason Phrase" href="#rfc.section.4">
     487      <link rel="Chapter" title="4 Status Codes" href="#rfc.section.4">
    488488      <link rel="Chapter" title="5 Representation" href="#rfc.section.5">
    489489      <link rel="Chapter" title="6 Common Protocol Parameters" href="#rfc.section.6">
     
    504504      <meta name="dct.creator" content="Reschke, J. F.">
    505505      <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p2-semantics-latest">
    506       <meta name="dct.issued" scheme="ISO8601" content="2012-03-28">
     506      <meta name="dct.issued" scheme="ISO8601" content="2012-03-29">
    507507      <meta name="dct.replaces" content="urn:ietf:rfc:2616">
    508508      <meta name="dct.abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypertext information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 2 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 2 defines the semantics of HTTP messages as expressed by request methods, request header fields, response status codes, and response header fields.">
     
    535535            </tr>
    536536            <tr>
    537                <td class="left">Expires: September 29, 2012</td>
     537               <td class="left">Expires: September 30, 2012</td>
    538538               <td class="right">greenbytes</td>
    539539            </tr>
    540540            <tr>
    541541               <td class="left"></td>
    542                <td class="right">March 28, 2012</td>
     542               <td class="right">March 29, 2012</td>
    543543            </tr>
    544544         </tbody>
     
    570570         in progress”.
    571571      </p>
    572       <p>This Internet-Draft will expire on September 29, 2012.</p>
     572      <p>This Internet-Draft will expire on September 30, 2012.</p>
    573573      <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
    574574      <p>Copyright © 2012 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
     
    626626            </ul>
    627627         </li>
    628          <li>4.&nbsp;&nbsp;&nbsp;<a href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a><ul>
     628         <li>4.&nbsp;&nbsp;&nbsp;<a href="#status.codes">Status Codes</a><ul>
    629629               <li>4.1&nbsp;&nbsp;&nbsp;<a href="#overview.of.status.codes">Overview of Status Codes</a></li>
    630630               <li>4.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registry">Status Code Registry</a><ul>
     
    13081308         </table>
    13091309      </div>
    1310       <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h1>
     1310      <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="status.codes" href="#status.codes">Status Codes</a></h1>
    13111311      <p id="rfc.section.4.p.1">The status-code element is a 3-digit integer result code of the attempt to understand and satisfy the request.</p>
    1312       <p id="rfc.section.4.p.2">The reason-phrase is intended to give a short textual description of the status-code and is intended for a human user. The
    1313          client does not need to examine or display the reason-phrase.
    1314       </p>
    1315       <div id="rfc.figure.u.7"></div><pre class="inline"><span id="rfc.iref.g.3"></span><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span>  <a href="#status.code.and.reason.phrase" class="smpl">status-code</a>    = 3<a href="#notation" class="smpl">DIGIT</a>
    1316   <a href="#status.code.and.reason.phrase" class="smpl">reason-phrase</a>  = *( <a href="#notation" class="smpl">HTAB</a> / <a href="#notation" class="smpl">SP</a> / <a href="#notation" class="smpl">VCHAR</a> / <a href="#core.rules" class="smpl">obs-text</a> )
    1317 </pre><p id="rfc.section.4.p.4">HTTP status codes are extensible. HTTP applications are not required to understand the meaning of all registered status codes,
     1312      <p id="rfc.section.4.p.2">HTTP status codes are extensible. HTTP applications are not required to understand the meaning of all registered status codes,
    13181313         though such understanding is obviously desirable. However, applications <em class="bcp14">MUST</em> understand the class of any status code, as indicated by the first digit, and treat any unrecognized response as being equivalent
    13191314         to the x00 status code of that class, with the exception that an unrecognized response <em class="bcp14">MUST NOT</em> be cached. For example, if an unrecognized status code of 431 is received by the client, it can safely assume that there was
     
    13211316         information which will explain the unusual status.
    13221317      </p>
    1323       <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.
     1318      <p id="rfc.section.4.p.3">The first digit of the status-code defines the class of response. The last two digits do not have any categorization role.
    13241319         There are 5 values for the first digit:
    13251320      </p>
     
    13311326         <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
    13321327      </ul>
    1333       <p id="rfc.section.4.p.6">For most status codes the response can carry a payload, in which case a Content-Type header field indicates the payload's
     1328      <p id="rfc.section.4.p.4">For most status codes the response can carry a payload, in which case a Content-Type header field indicates the payload's
    13341329         media type (<a href="p3-payload.html#header.content-type" title="Content-Type">Section 6.8</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    13351330      </p>
     
    15751570         that are required, those that modify the semantics of the response).
    15761571      </p>
    1577       <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.code.and.reason.phrase" title="Status Code and Reason Phrase">Section&nbsp;4</a>. To allow existing parsers to properly handle them, new status codes cannot disallow a response body, although they can mandate
     1572      <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 Codes">Section&nbsp;4</a>. To allow existing parsers to properly handle them, new status codes cannot disallow a response body, although they can mandate
    15781573         a zero-length response body. They can require the presence of one or more particular HTTP response header(s).
    15791574      </p>
     
    15921587         a request, then it need not forward the corresponding 100 (Continue) response(s).)
    15931588      </p>
    1594       <div id="rfc.iref.22"></div>
     1589      <div id="rfc.iref.19"></div>
    15951590      <div id="rfc.iref.s.2"></div>
    15961591      <h3 id="rfc.section.4.3.1"><a href="#rfc.section.4.3.1">4.3.1</a>&nbsp;<a id="status.100" href="#status.100">100 Continue</a></h3>
     
    15991594         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.Part1.30"><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.
    16001595      </p>
    1601       <div id="rfc.iref.23"></div>
     1596      <div id="rfc.iref.20"></div>
    16021597      <div id="rfc.iref.s.3"></div>
    16031598      <h3 id="rfc.section.4.3.2"><a href="#rfc.section.4.3.2">4.3.2</a>&nbsp;<a id="status.101" href="#status.101">101 Switching Protocols</a></h3>
     
    16111606      <h2 id="rfc.section.4.4"><a href="#rfc.section.4.4">4.4</a>&nbsp;<a id="status.2xx" href="#status.2xx">Successful 2xx</a></h2>
    16121607      <p id="rfc.section.4.4.p.1">This class of status code indicates that the client's request was successfully received, understood, and accepted.</p>
    1613       <div id="rfc.iref.24"></div>
     1608      <div id="rfc.iref.21"></div>
    16141609      <div id="rfc.iref.s.4"></div>
    16151610      <h3 id="rfc.section.4.4.1"><a href="#rfc.section.4.4.1">4.4.1</a>&nbsp;<a id="status.200" href="#status.200">200 OK</a></h3>
     
    16271622      <p id="rfc.section.4.4.1.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.
    16281623      </p>
    1629       <div id="rfc.iref.25"></div>
     1624      <div id="rfc.iref.22"></div>
    16301625      <div id="rfc.iref.s.5"></div>
    16311626      <h3 id="rfc.section.4.4.2"><a href="#rfc.section.4.4.2">4.4.2</a>&nbsp;<a id="status.201" href="#status.201">201 Created</a></h3>
     
    16401635         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>).
    16411636      </p>
    1642       <div id="rfc.iref.26"></div>
     1637      <div id="rfc.iref.23"></div>
    16431638      <div id="rfc.iref.s.6"></div>
    16441639      <h3 id="rfc.section.4.4.3"><a href="#rfc.section.4.4.3">4.4.3</a>&nbsp;<a id="status.202" href="#status.202">202 Accepted</a></h3>
     
    16521647         user can expect the request to be fulfilled.
    16531648      </p>
    1654       <div id="rfc.iref.27"></div>
     1649      <div id="rfc.iref.24"></div>
    16551650      <div id="rfc.iref.s.7"></div>
    16561651      <h3 id="rfc.section.4.4.4"><a href="#rfc.section.4.4.4">4.4.4</a>&nbsp;<a id="status.203" href="#status.203">203 Non-Authoritative Information</a></h3>
     
    16621657      <p id="rfc.section.4.4.4.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.
    16631658      </p>
    1664       <div id="rfc.iref.28"></div>
     1659      <div id="rfc.iref.25"></div>
    16651660      <div id="rfc.iref.s.8"></div>
    16661661      <h3 id="rfc.section.4.4.5"><a href="#rfc.section.4.4.5">4.4.5</a>&nbsp;<a id="status.204" href="#status.204">204 No Content</a></h3>
     
    16831678      <p id="rfc.section.4.4.5.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.
    16841679      </p>
    1685       <div id="rfc.iref.29"></div>
     1680      <div id="rfc.iref.26"></div>
    16861681      <div id="rfc.iref.s.9"></div>
    16871682      <h3 id="rfc.section.4.4.6"><a href="#rfc.section.4.4.6">4.4.6</a>&nbsp;<a id="status.205" href="#status.205">205 Reset Content</a></h3>
     
    17391734         </p>
    17401735      </div>
    1741       <div id="rfc.iref.30"></div>
     1736      <div id="rfc.iref.27"></div>
    17421737      <div id="rfc.iref.s.10"></div>
    17431738      <h3 id="rfc.section.4.5.1"><a href="#rfc.section.4.5.1">4.5.1</a>&nbsp;<a id="status.300" href="#status.300">300 Multiple Choices</a></h3>
     
    17541749      <p id="rfc.section.4.5.1.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.
    17551750      </p>
    1756       <div id="rfc.iref.31"></div>
     1751      <div id="rfc.iref.28"></div>
    17571752      <div id="rfc.iref.s.11"></div>
    17581753      <h3 id="rfc.section.4.5.2"><a href="#rfc.section.4.5.2">4.5.2</a>&nbsp;<a id="status.301" href="#status.301">301 Moved Permanently</a></h3>
     
    17701765         </p>
    17711766      </div>
    1772       <div id="rfc.iref.32"></div>
     1767      <div id="rfc.iref.29"></div>
    17731768      <div id="rfc.iref.s.12"></div>
    17741769      <h3 id="rfc.section.4.5.3"><a href="#rfc.section.4.5.3">4.5.3</a>&nbsp;<a id="status.302" href="#status.302">302 Found</a></h3>
     
    17831778         </p>
    17841779      </div>
    1785       <div id="rfc.iref.33"></div>
     1780      <div id="rfc.iref.30"></div>
    17861781      <div id="rfc.iref.s.13"></div>
    17871782      <h3 id="rfc.section.4.5.4"><a href="#rfc.section.4.5.4">4.5.4</a>&nbsp;<a id="status.303" href="#status.303">303 See Other</a></h3>
     
    18041799      <p id="rfc.section.4.5.4.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.
    18051800      </p>
    1806       <div id="rfc.iref.34"></div>
     1801      <div id="rfc.iref.31"></div>
    18071802      <div id="rfc.iref.s.14"></div>
    18081803      <h3 id="rfc.section.4.5.5"><a href="#rfc.section.4.5.5">4.5.5</a>&nbsp;<a id="status.305" href="#status.305">305 Use Proxy</a></h3>
    18091804      <p id="rfc.section.4.5.5.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.
    18101805      </p>
    1811       <div id="rfc.iref.35"></div>
     1806      <div id="rfc.iref.32"></div>
    18121807      <div id="rfc.iref.s.15"></div>
    18131808      <h3 id="rfc.section.4.5.6"><a href="#rfc.section.4.5.6">4.5.6</a>&nbsp;<a id="status.306" href="#status.306">306 (Unused)</a></h3>
    18141809      <p id="rfc.section.4.5.6.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>
    1815       <div id="rfc.iref.36"></div>
     1810      <div id="rfc.iref.33"></div>
    18161811      <div id="rfc.iref.s.16"></div>
    18171812      <h3 id="rfc.section.4.5.7"><a href="#rfc.section.4.5.7">4.5.7</a>&nbsp;<a id="status.307" href="#status.307">307 Temporary Redirect</a></h3>
     
    18311826         These status codes are applicable to any request method. User agents <em class="bcp14">SHOULD</em> display any included representation to the user.
    18321827      </p>
    1833       <div id="rfc.iref.37"></div>
     1828      <div id="rfc.iref.34"></div>
    18341829      <div id="rfc.iref.s.17"></div>
    18351830      <h3 id="rfc.section.4.6.1"><a href="#rfc.section.4.6.1">4.6.1</a>&nbsp;<a id="status.400" href="#status.400">400 Bad Request</a></h3>
    18361831      <p id="rfc.section.4.6.1.p.1">The server cannot or will not process the request, due to a client error (e.g., malformed syntax).</p>
    1837       <div id="rfc.iref.38"></div>
     1832      <div id="rfc.iref.35"></div>
    18381833      <div id="rfc.iref.s.18"></div>
    18391834      <h3 id="rfc.section.4.6.2"><a href="#rfc.section.4.6.2">4.6.2</a>&nbsp;<a id="status.402" href="#status.402">402 Payment Required</a></h3>
    18401835      <p id="rfc.section.4.6.2.p.1">This code is reserved for future use.</p>
    1841       <div id="rfc.iref.39"></div>
     1836      <div id="rfc.iref.36"></div>
    18421837      <div id="rfc.iref.s.19"></div>
    18431838      <h3 id="rfc.section.4.6.3"><a href="#rfc.section.4.6.3">4.6.3</a>&nbsp;<a id="status.403" href="#status.403">403 Forbidden</a></h3>
     
    18481843         to the client, the status code 404 (Not Found) <em class="bcp14">MAY</em> be used instead.
    18491844      </p>
    1850       <div id="rfc.iref.40"></div>
     1845      <div id="rfc.iref.37"></div>
    18511846      <div id="rfc.iref.s.20"></div>
    18521847      <h3 id="rfc.section.4.6.4"><a href="#rfc.section.4.6.4">4.6.4</a>&nbsp;<a id="status.404" href="#status.404">404 Not Found</a></h3>
     
    18561851         has been refused, or when no other response is applicable.
    18571852      </p>
    1858       <div id="rfc.iref.41"></div>
     1853      <div id="rfc.iref.38"></div>
    18591854      <div id="rfc.iref.s.21"></div>
    18601855      <h3 id="rfc.section.4.6.5"><a href="#rfc.section.4.6.5">4.6.5</a>&nbsp;<a id="status.405" href="#status.405">405 Method Not Allowed</a></h3>
    18611856      <p id="rfc.section.4.6.5.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.
    18621857      </p>
    1863       <div id="rfc.iref.42"></div>
     1858      <div id="rfc.iref.39"></div>
    18641859      <div id="rfc.iref.s.22"></div>
    18651860      <h3 id="rfc.section.4.6.6"><a href="#rfc.section.4.6.6">4.6.6</a>&nbsp;<a id="status.406" href="#status.406">406 Not Acceptable</a></h3>
     
    18791874      <p id="rfc.section.4.6.6.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.
    18801875      </p>
    1881       <div id="rfc.iref.43"></div>
     1876      <div id="rfc.iref.40"></div>
    18821877      <div id="rfc.iref.s.23"></div>
    18831878      <h3 id="rfc.section.4.6.7"><a href="#rfc.section.4.6.7">4.6.7</a>&nbsp;<a id="status.408" href="#status.408">408 Request Timeout</a></h3>
    18841879      <p id="rfc.section.4.6.7.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.
    18851880      </p>
    1886       <div id="rfc.iref.44"></div>
     1881      <div id="rfc.iref.41"></div>
    18871882      <div id="rfc.iref.s.24"></div>
    18881883      <h3 id="rfc.section.4.6.8"><a href="#rfc.section.4.6.8">4.6.8</a>&nbsp;<a id="status.409" href="#status.409">409 Conflict</a></h3>
     
    18971892         contain a list of the differences between the two versions.
    18981893      </p>
    1899       <div id="rfc.iref.45"></div>
     1894      <div id="rfc.iref.42"></div>
    19001895      <div id="rfc.iref.s.25"></div>
    19011896      <h3 id="rfc.section.4.6.9"><a href="#rfc.section.4.6.9">4.6.9</a>&nbsp;<a id="status.410" href="#status.410">410 Gone</a></h3>
     
    19121907      <p id="rfc.section.4.6.9.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.
    19131908      </p>
    1914       <div id="rfc.iref.46"></div>
     1909      <div id="rfc.iref.43"></div>
    19151910      <div id="rfc.iref.s.26"></div>
    19161911      <h3 id="rfc.section.4.6.10"><a href="#rfc.section.4.6.10">4.6.10</a>&nbsp;<a id="status.411" href="#status.411">411 Length Required</a></h3>
     
    19181913         message.
    19191914      </p>
    1920       <div id="rfc.iref.47"></div>
     1915      <div id="rfc.iref.44"></div>
    19211916      <div id="rfc.iref.s.27"></div>
    19221917      <h3 id="rfc.section.4.6.11"><a href="#rfc.section.4.6.11">4.6.11</a>&nbsp;<a id="status.413" href="#status.413">413 Request Representation Too Large</a></h3>
     
    19261921      <p id="rfc.section.4.6.11.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.
    19271922      </p>
    1928       <div id="rfc.iref.48"></div>
     1923      <div id="rfc.iref.45"></div>
    19291924      <div id="rfc.iref.s.28"></div>
    19301925      <h3 id="rfc.section.4.6.12"><a href="#rfc.section.4.6.12">4.6.12</a>&nbsp;<a id="status.414" href="#status.414">414 URI Too Long</a></h3>
     
    19351930         in some servers using fixed-length buffers for reading or manipulating the request-target.
    19361931      </p>
    1937       <div id="rfc.iref.49"></div>
     1932      <div id="rfc.iref.46"></div>
    19381933      <div id="rfc.iref.s.29"></div>
    19391934      <h3 id="rfc.section.4.6.13"><a href="#rfc.section.4.6.13">4.6.13</a>&nbsp;<a id="status.415" href="#status.415">415 Unsupported Media Type</a></h3>
     
    19411936         on the target resource.
    19421937      </p>
    1943       <div id="rfc.iref.50"></div>
     1938      <div id="rfc.iref.47"></div>
    19441939      <div id="rfc.iref.s.30"></div>
    19451940      <h3 id="rfc.section.4.6.14"><a href="#rfc.section.4.6.14">4.6.14</a>&nbsp;<a id="status.417" href="#status.417">417 Expectation Failed</a></h3>
     
    19471942         not be met by the next-hop server.
    19481943      </p>
    1949       <div id="rfc.iref.51"></div>
     1944      <div id="rfc.iref.48"></div>
    19501945      <div id="rfc.iref.s.31"></div>
    19511946      <h3 id="rfc.section.4.6.15"><a href="#rfc.section.4.6.15">4.6.15</a>&nbsp;<a id="status.426" href="#status.426">426 Upgrade Required</a></h3>
    19521947      <p id="rfc.section.4.6.15.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.Part1.34"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) specifying the required protocols.
    19531948      </p>
    1954       <div id="rfc.figure.u.8"></div>
     1949      <div id="rfc.figure.u.7"></div>
    19551950      <p>Example:</p>  <pre class="text">HTTP/1.1 426 Upgrade Required
    19561951Upgrade: HTTP/3.0
     
    19681963         User agents <em class="bcp14">SHOULD</em> display any included representation to the user. These response codes are applicable to any request method.
    19691964      </p>
    1970       <div id="rfc.iref.52"></div>
     1965      <div id="rfc.iref.49"></div>
    19711966      <div id="rfc.iref.s.32"></div>
    19721967      <h3 id="rfc.section.4.7.1"><a href="#rfc.section.4.7.1">4.7.1</a>&nbsp;<a id="status.500" href="#status.500">500 Internal Server Error</a></h3>
    19731968      <p id="rfc.section.4.7.1.p.1">The server encountered an unexpected condition which prevented it from fulfilling the request.</p>
    1974       <div id="rfc.iref.53"></div>
     1969      <div id="rfc.iref.50"></div>
    19751970      <div id="rfc.iref.s.33"></div>
    19761971      <h3 id="rfc.section.4.7.2"><a href="#rfc.section.4.7.2">4.7.2</a>&nbsp;<a id="status.501" href="#status.501">501 Not Implemented</a></h3>
     
    19781973         does not recognize the request method and is not capable of supporting it for any resource.
    19791974      </p>
    1980       <div id="rfc.iref.54"></div>
     1975      <div id="rfc.iref.51"></div>
    19811976      <div id="rfc.iref.s.34"></div>
    19821977      <h3 id="rfc.section.4.7.3"><a href="#rfc.section.4.7.3">4.7.3</a>&nbsp;<a id="status.502" href="#status.502">502 Bad Gateway</a></h3>
     
    19841979         to fulfill the request.
    19851980      </p>
    1986       <div id="rfc.iref.55"></div>
     1981      <div id="rfc.iref.52"></div>
    19871982      <div id="rfc.iref.s.35"></div>
    19881983      <h3 id="rfc.section.4.7.4"><a href="#rfc.section.4.7.4">4.7.4</a>&nbsp;<a id="status.503" href="#status.503">503 Service Unavailable</a></h3>
     
    19961991         </p>
    19971992      </div>
    1998       <div id="rfc.iref.56"></div>
     1993      <div id="rfc.iref.53"></div>
    19991994      <div id="rfc.iref.s.36"></div>
    20001995      <h3 id="rfc.section.4.7.5"><a href="#rfc.section.4.7.5">4.7.5</a>&nbsp;<a id="status.504" href="#status.504">504 Gateway Timeout</a></h3>
     
    20062001         </p>
    20072002      </div>
    2008       <div id="rfc.iref.57"></div>
     2003      <div id="rfc.iref.54"></div>
    20092004      <div id="rfc.iref.s.37"></div>
    20102005      <h3 id="rfc.section.4.7.6"><a href="#rfc.section.4.7.6">4.7.6</a>&nbsp;<a id="status.505" href="#status.505">505 HTTP Version Not Supported</a></h3>
     
    20512046         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>:
    20522047      </p>
    2053       <div id="rfc.figure.u.9"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
     2048      <div id="rfc.figure.u.8"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
    20542049</pre><p id="rfc.section.6.1.p.3">The other formats are described here only for compatibility with obsolete implementations.</p>
    2055       <div id="rfc.figure.u.10"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
     2050      <div id="rfc.figure.u.9"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
    20562051Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
    20572052</pre><p id="rfc.section.6.1.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.
     
    20612056         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.
    20622057      </p>
    2063       <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>
     2058      <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.3"></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>
    20642059</pre><div id="preferred.date.format">
    20652060         <p id="rfc.section.6.1.p.8">                    Preferred format:</p>
    20662061      </div>
    2067       <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>
     2062      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span><span id="rfc.iref.g.6"></span><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>  <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>
    20682063  ; fixed length subset of the format defined in
    20692064  ; <a href="http://tools.ietf.org/html/rfc1123#section-5.2.14">Section 5.2.14</a> of <a href="#RFC1123" id="rfc.xref.RFC1123.2"><cite title="Requirements for Internet Hosts - Application and Support">[RFC1123]</cite></a>
     
    21082103         <p id="rfc.section.6.1.p.11">                Obsolete formats:</p>
    21092104      </div>
    2110       <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>
    2111 </pre><div id="rfc.figure.u.14"></div><pre class="inline"><span id="rfc.iref.g.20"></span>  <a href="#obsolete.date.formats" class="smpl">rfc850-date</a>  = <a href="#obsolete.date.formats" class="smpl">day-name-l</a> "," <a href="#notation" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date2</a> <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>
     2105      <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.16"></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>
     2106</pre><div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.17"></span>  <a href="#obsolete.date.formats" class="smpl">rfc850-date</a>  = <a href="#obsolete.date.formats" class="smpl">day-name-l</a> "," <a href="#notation" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date2</a> <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>
    21122107  <a href="#obsolete.date.formats" class="smpl">date2</a>        = <a href="#preferred.date.format" class="smpl">day</a> "-" <a href="#preferred.date.format" class="smpl">month</a> "-" 2<a href="#notation" class="smpl">DIGIT</a>
    21132108                 ; day-month-year (e.g., 02-Jun-82)
     
    21202115         / %x53.61.74.75.72.64.61.79 ; "Saturday", case-sensitive
    21212116         / %x53.75.6E.64.61.79 ; "Sunday", case-sensitive
    2122 </pre><div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  <a href="#obsolete.date.formats" class="smpl">asctime-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> <a href="#notation" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date3</a> <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">year</a>
     2117</pre><div id="rfc.figure.u.14"></div><pre class="inline"><span id="rfc.iref.g.18"></span>  <a href="#obsolete.date.formats" class="smpl">asctime-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> <a href="#notation" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date3</a> <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">year</a>
    21232118  <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> ))
    21242119                 ; month day (e.g., Jun  2)
     
    21382133         By convention, the products are listed in order of their significance for identifying the application.
    21392134      </p>
    2140       <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>]
     2135      <div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></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>]
    21412136  <a href="#product.tokens" class="smpl">product-version</a> = <a href="#core.rules" class="smpl">token</a>
    21422137</pre><p id="rfc.section.6.2.p.3">Examples:</p>
    2143       <div id="rfc.figure.u.17"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     2138      <div id="rfc.figure.u.16"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    21442139  Server: Apache/0.8.4
    21452140</pre><p id="rfc.section.6.2.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).
     
    21532148         is strictly to inform the recipient of valid request methods associated with the resource.
    21542149      </p>
    2155       <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="#methods" class="smpl">method</a>
     2150      <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  <a href="#header.allow" class="smpl">Allow</a> = #<a href="#methods" class="smpl">method</a>
    21562151</pre><p id="rfc.section.7.1.p.3">Example of use:</p>
    2157       <div id="rfc.figure.u.19"></div><pre class="text">  Allow: GET, HEAD, PUT
     2152      <div id="rfc.figure.u.18"></div><pre class="text">  Allow: GET, HEAD, PUT
    21582153</pre><p id="rfc.section.7.1.p.5">The actual set of allowed methods is defined by the origin server at the time of each request.</p>
    21592154      <p id="rfc.section.7.1.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
     
    21662161         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;6.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
    21672162      </p>
    2168       <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>
     2163      <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.22"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#http.date" class="smpl">HTTP-date</a>
    21692164</pre><p id="rfc.section.7.2.p.3">An example is</p>
    2170       <div id="rfc.figure.u.21"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
     2165      <div id="rfc.figure.u.20"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
    21712166</pre><p id="rfc.section.7.2.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
    21722167      </p>
     
    21942189      <h2 id="rfc.section.7.3"><a href="#rfc.section.7.3">7.3</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
    21952190      <p id="rfc.section.7.3.p.1">The "Expect" header field is used to indicate that particular server behaviors are required by the client.</p>
    2196       <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>
     2191      <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.23"></span><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span><span id="rfc.iref.g.26"></span><span id="rfc.iref.g.27"></span>  <a href="#header.expect" class="smpl">Expect</a>       = 1#<a href="#header.expect" class="smpl">expectation</a>
    21972192 
    21982193  <a href="#header.expect" class="smpl">expectation</a>  = <a href="#header.expect" class="smpl">expect-name</a> [ <a href="#core.rules" class="smpl">BWS</a> "=" <a href="#core.rules" class="smpl">BWS</a> <a href="#header.expect" class="smpl">expect-value</a> ]
     
    22062201      </p>
    22072202      <p id="rfc.section.7.3.p.4">The only expectation defined by this specification is:</p>
    2208       <p id="rfc.section.7.3.p.5"><span id="rfc.iref.89"></span><span id="rfc.iref.e.2"></span> 100-continue
     2203      <p id="rfc.section.7.3.p.5"><span id="rfc.iref.86"></span><span id="rfc.iref.e.2"></span> 100-continue
    22092204      </p>
    22102205      <ul class="empty">
     
    22222217      <p id="rfc.section.7.4.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>:
    22232218      </p>
    2224       <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>
     2219      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.28"></span>  <a href="#header.from" class="smpl">From</a>    = <a href="#header.from" class="smpl">mailbox</a>
    22252220 
    22262221  <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;
    22272222</pre><p id="rfc.section.7.4.p.3">An example is:</p>
    2228       <div id="rfc.figure.u.24"></div><pre class="text">  From: webmaster@example.org
     2223      <div id="rfc.figure.u.23"></div><pre class="text">  From: webmaster@example.org
    22292224</pre><p id="rfc.section.7.4.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
    22302225         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
     
    22432238      <p id="rfc.section.7.5.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.
    22442239      </p>
    2245       <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>
     2240      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.29"></span>  <a href="#header.location" class="smpl">Location</a> = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
    22462241</pre><p id="rfc.section.7.5.p.3">For 201 (Created) responses, the Location is the URI of the new resource which was created by the request. For 3xx responses,
    22472242         the location <em class="bcp14">SHOULD</em> indicate the server's preferred URI for automatic redirection to the resource.
     
    22502245         then the original URI's fragment identifier is added to the final value.
    22512246      </p>
    2252       <div id="rfc.figure.u.26"></div>
     2247      <div id="rfc.figure.u.25"></div>
    22532248      <p>For example, the original URI "http://www.example.org/~tim", combined with a field value given as:</p>  <pre class="text">  Location: /pub/WWW/People.html#tim
    22542249</pre>  <p>would result in a final value of "http://www.example.org/pub/WWW/People.html#tim"</p>
    2255       <div id="rfc.figure.u.27"></div>
     2250      <div id="rfc.figure.u.26"></div>
    22562251      <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
    22572252</pre>  <p>would result in a final value of "http://www.example.net/index.html#larry", preserving the original fragment identifier.</p>
     
    22752270         to trace a request which appears to be failing or looping mid-chain.
    22762271      </p>
    2277       <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>
     2272      <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.30"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
    22782273</pre><p id="rfc.section.7.6.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
    22792274      <p id="rfc.section.7.6.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).
     
    22952290         non-HTTP URIs (e.g., FTP).
    22962291      </p>
    2297       <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>
     2292      <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.31"></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>
    22982293</pre><p id="rfc.section.7.7.p.5">Example:</p>
    2299       <div id="rfc.figure.u.30"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
     2294      <div id="rfc.figure.u.29"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
    23002295</pre><p id="rfc.section.7.7.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;9.2</a> for security considerations.
    23012296      </p>
     
    23082303      </p>
    23092304      <p id="rfc.section.7.8.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>
    2310       <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>
     2305      <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.32"></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>
    23112306</pre><div id="rule.delta-seconds">
    23122307         <p id="rfc.section.7.8.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
    23132308      </div>
    2314       <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>
     2309      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.33"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
    23152310</pre><p id="rfc.section.7.8.p.6">Two examples of its use are</p>
    2316       <div id="rfc.figure.u.33"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
     2311      <div id="rfc.figure.u.32"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
    23172312  Retry-After: 120
    23182313</pre><p id="rfc.section.7.8.p.8">In the latter example, the delay is 2 minutes.</p>
     
    23242319         identifying the application.
    23252320      </p>
    2326       <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> ) )
     2321      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.34"></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> ) )
    23272322</pre><p id="rfc.section.7.9.p.4">Example:</p>
    2328       <div id="rfc.figure.u.35"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
     2323      <div id="rfc.figure.u.34"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
    23292324</pre><p id="rfc.section.7.9.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>).
    23302325      </p>
     
    23542349         doing so makes the field value more difficult to parse.
    23552350      </p>
    2356       <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> ) )
     2351      <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.35"></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> ) )
    23572352</pre><p id="rfc.section.7.10.p.7">Example:</p>
    2358       <div id="rfc.figure.u.37"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     2353      <div id="rfc.figure.u.36"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    23592354</pre><h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
    23602355      <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="method.registration" href="#method.registration">Method Registry</a></h2>
     
    29802975      </p>
    29812976      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    2982       <div id="rfc.figure.u.38"></div> <pre class="inline"><a href="#header.allow" class="smpl">Allow</a> = [ ( "," / method ) *( OWS "," [ OWS method ] ) ]
     2977      <div id="rfc.figure.u.37"></div> <pre class="inline"><a href="#header.allow" class="smpl">Allow</a> = [ ( "," / method ) *( OWS "," [ OWS method ] ) ]
    29832978
    29842979<a href="#core.rules" class="smpl">BWS</a> = &lt;BWS, defined in [Part1], Section 3.2.1&gt;
     
    30673062<a href="#core.rules" class="smpl">quoted-string</a> = &lt;quoted-string, defined in [Part1], Section 3.2.4&gt;
    30683063
    3069 <a href="#status.code.and.reason.phrase" class="smpl">reason-phrase</a> = *( HTAB / SP / VCHAR / obs-text )
    30703064<a href="#preferred.date.format" class="smpl">rfc1123-date</a> = day-name "," SP date1 SP time-of-day SP GMT
    30713065<a href="#obsolete.date.formats" class="smpl">rfc850-date</a> = day-name-l "," SP date2 SP time-of-day SP GMT
    30723066
    30733067<a href="#preferred.date.format" class="smpl">second</a> = 2DIGIT
    3074 <a href="#status.code.and.reason.phrase" class="smpl">status-code</a> = 3DIGIT
    30753068
    30763069<a href="#preferred.date.format" class="smpl">time-of-day</a> = hour ":" minute ":" second
     
    30783071
    30793072<a href="#preferred.date.format" class="smpl">year</a> = 4DIGIT
    3080 </pre> <div id="rfc.figure.u.39"></div>
     3073</pre> <div id="rfc.figure.u.38"></div>
    30813074      <p>ABNF diagnostics:</p><pre class="inline">; Allow defined but not used
    30823075; Date defined but not used
     
    30893082; Server defined but not used
    30903083; User-Agent defined but not used
    3091 ; reason-phrase defined but not used
    3092 ; status-code defined but not used
     3084; obs-text defined but not used
    30933085</pre><h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
    30943086      <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a>&nbsp;Since RFC 2616
     
    34203412         <ul class="ind">
    34213413            <li><a id="rfc.index.1" href="#rfc.index.1"><b>1</b></a><ul>
    3422                   <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.22"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">8.2</a></li>
    3423                   <li>100-continue (expect value)&nbsp;&nbsp;<a href="#rfc.iref.89"><b>7.3</b></a></li>
    3424                   <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.23"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">8.2</a></li>
     3414                  <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.19"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">8.2</a></li>
     3415                  <li>100-continue (expect value)&nbsp;&nbsp;<a href="#rfc.iref.86"><b>7.3</b></a></li>
     3416                  <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.20"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">8.2</a></li>
    34253417               </ul>
    34263418            </li>
    34273419            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    3428                   <li>200 OK (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.24"><b>4.4.1</b></a>, <a href="#rfc.xref.status.200.2">8.2</a></li>
    3429                   <li>201 Created (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.25"><b>4.4.2</b></a>, <a href="#rfc.xref.status.201.2">8.2</a></li>
    3430                   <li>202 Accepted (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.26"><b>4.4.3</b></a>, <a href="#rfc.xref.status.202.2">8.2</a></li>
    3431                   <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>4.4.4</b></a>, <a href="#rfc.xref.status.203.2">8.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
    3432                   <li>204 No Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.28"><b>4.4.5</b></a>, <a href="#rfc.xref.status.204.2">8.2</a></li>
    3433                   <li>205 Reset Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.29"><b>4.4.6</b></a>, <a href="#rfc.xref.status.205.2">8.2</a></li>
     3420                  <li>200 OK (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.21"><b>4.4.1</b></a>, <a href="#rfc.xref.status.200.2">8.2</a></li>
     3421                  <li>201 Created (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.22"><b>4.4.2</b></a>, <a href="#rfc.xref.status.201.2">8.2</a></li>
     3422                  <li>202 Accepted (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.23"><b>4.4.3</b></a>, <a href="#rfc.xref.status.202.2">8.2</a></li>
     3423                  <li>203 Non-Authoritative Information (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.24"><b>4.4.4</b></a>, <a href="#rfc.xref.status.203.2">8.2</a>, <a href="#rfc.xref.status.203.3">A</a></li>
     3424                  <li>204 No Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.25"><b>4.4.5</b></a>, <a href="#rfc.xref.status.204.2">8.2</a></li>
     3425                  <li>205 Reset Content (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.26"><b>4.4.6</b></a>, <a href="#rfc.xref.status.205.2">8.2</a></li>
    34343426               </ul>
    34353427            </li>
    34363428            <li><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul>
    3437                   <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.30"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">8.2</a></li>
    3438                   <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.31"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">8.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
    3439                   <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.32"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">8.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
    3440                   <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.33"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">8.2</a></li>
    3441                   <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.34"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">8.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
    3442                   <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.35"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">8.2</a></li>
    3443                   <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.36"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">8.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
     3429                  <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.27"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">8.2</a></li>
     3430                  <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.28"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">8.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
     3431                  <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.29"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">8.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
     3432                  <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.30"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">8.2</a></li>
     3433                  <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.31"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">8.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
     3434                  <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.32"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">8.2</a></li>
     3435                  <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.33"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">8.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
    34443436               </ul>
    34453437            </li>
    34463438            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
    3447                   <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.37"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">8.2</a></li>
    3448                   <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.38"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">8.2</a></li>
    3449                   <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.39"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">8.2</a></li>
    3450                   <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.40"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">8.2</a></li>
    3451                   <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>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">8.2</a></li>
    3452                   <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.42"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">8.2</a></li>
    3453                   <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.43"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">8.2</a></li>
    3454                   <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.44"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">8.2</a></li>
    3455                   <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.45"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">8.2</a></li>
    3456                   <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.46"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">8.2</a></li>
    3457                   <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>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">8.2</a></li>
    3458                   <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>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">8.2</a></li>
    3459                   <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>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">8.2</a></li>
    3460                   <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.50"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">8.2</a></li>
    3461                   <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.51"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">8.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
     3439                  <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.34"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">8.2</a></li>
     3440                  <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.35"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">8.2</a></li>
     3441                  <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.36"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">8.2</a></li>
     3442                  <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.37"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">8.2</a></li>
     3443                  <li>405 Method Not Allowed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.38"><b>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">8.2</a></li>
     3444                  <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.39"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">8.2</a></li>
     3445                  <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.40"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">8.2</a></li>
     3446                  <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.41"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">8.2</a></li>
     3447                  <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.42"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">8.2</a></li>
     3448                  <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.43"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">8.2</a></li>
     3449                  <li>413 Request Representation Too Large (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.44"><b>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">8.2</a></li>
     3450                  <li>414 URI Too Long (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.45"><b>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">8.2</a></li>
     3451                  <li>415 Unsupported Media Type (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.46"><b>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">8.2</a></li>
     3452                  <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.47"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">8.2</a></li>
     3453                  <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.48"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">8.2</a>, <a href="#rfc.xref.status.426.3">A</a></li>
    34623454               </ul>
    34633455            </li>
    34643456            <li><a id="rfc.index.5" href="#rfc.index.5"><b>5</b></a><ul>
    3465                   <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>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">8.2</a></li>
    3466                   <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.53"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">8.2</a></li>
    3467                   <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.54"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">8.2</a></li>
    3468                   <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.55"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">8.2</a></li>
    3469                   <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.56"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">8.2</a></li>
    3470                   <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>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">8.2</a></li>
     3457                  <li>500 Internal Server Error (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.49"><b>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">8.2</a></li>
     3458                  <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.50"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">8.2</a></li>
     3459                  <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.51"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">8.2</a></li>
     3460                  <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.52"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">8.2</a></li>
     3461                  <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.53"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">8.2</a></li>
     3462                  <li>505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.54"><b>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">8.2</a></li>
    34713463               </ul>
    34723464            </li>
     
    35023494                  <li><tt>Grammar</tt>&nbsp;&nbsp;
    35033495                     <ul>
    3504                         <li><tt>Allow</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>7.1</b></a></li>
    3505                         <li><tt>asctime-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>6.1</b></a></li>
    3506                         <li><tt>Date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.25"><b>7.2</b></a></li>
    3507                         <li><tt>date1</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>6.1</b></a></li>
    3508                         <li><tt>day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>6.1</b></a></li>
    3509                         <li><tt>day-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>6.1</b></a></li>
    3510                         <li><tt>day-name-l</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>6.1</b></a></li>
    3511                         <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.36"><b>7.8</b></a></li>
    3512                         <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.26"><b>7.3</b></a></li>
    3513                         <li><tt>expect-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>7.3</b></a></li>
    3514                         <li><tt>expect-param</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.28"><b>7.3</b></a></li>
    3515                         <li><tt>expect-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.29"><b>7.3</b></a></li>
    3516                         <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.27"><b>7.3</b></a></li>
    3517                         <li><tt>extension-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>4</b></a></li>
    3518                         <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>7.4</b></a></li>
    3519                         <li><tt>GMT</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>6.1</b></a></li>
    3520                         <li><tt>hour</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>6.1</b></a></li>
    3521                         <li><tt>HTTP-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>6.1</b></a></li>
    3522                         <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>7.5</b></a></li>
    3523                         <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>7.6</b></a></li>
     3496                        <li><tt>Allow</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>7.1</b></a></li>
     3497                        <li><tt>asctime-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>6.1</b></a></li>
     3498                        <li><tt>Date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>7.2</b></a></li>
     3499                        <li><tt>date1</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>6.1</b></a></li>
     3500                        <li><tt>day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>6.1</b></a></li>
     3501                        <li><tt>day-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>6.1</b></a></li>
     3502                        <li><tt>day-name-l</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>6.1</b></a></li>
     3503                        <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>7.8</b></a></li>
     3504                        <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>7.3</b></a></li>
     3505                        <li><tt>expect-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.27"><b>7.3</b></a></li>
     3506                        <li><tt>expect-param</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.25"><b>7.3</b></a></li>
     3507                        <li><tt>expect-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.26"><b>7.3</b></a></li>
     3508                        <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>7.3</b></a></li>
     3509                        <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.28"><b>7.4</b></a></li>
     3510                        <li><tt>GMT</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>6.1</b></a></li>
     3511                        <li><tt>hour</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>6.1</b></a></li>
     3512                        <li><tt>HTTP-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>6.1</b></a></li>
     3513                        <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.29"><b>7.5</b></a></li>
     3514                        <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>7.6</b></a></li>
    35243515                        <li><tt>method</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.1"><b>2</b></a></li>
    3525                         <li><tt>minute</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>6.1</b></a></li>
    3526                         <li><tt>month</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>6.1</b></a></li>
    3527                         <li><tt>obs-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>6.1</b></a></li>
    3528                         <li><tt>product</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>6.2</b></a></li>
    3529                         <li><tt>product-version</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>6.2</b></a></li>
    3530                         <li><tt>reason-phrase</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>4</b></a></li>
    3531                         <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>7.7</b></a></li>
    3532                         <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>7.8</b></a></li>
    3533                         <li><tt>rfc1123-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>6.1</b></a></li>
    3534                         <li><tt>rfc850-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>6.1</b></a></li>
    3535                         <li><tt>second</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>6.1</b></a></li>
    3536                         <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.37"><b>7.9</b></a></li>
    3537                         <li><tt>status-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>4</b></a></li>
    3538                         <li><tt>time-of-day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>6.1</b></a></li>
    3539                         <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.38"><b>7.10</b></a></li>
    3540                         <li><tt>year</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>6.1</b></a></li>
     3516                        <li><tt>minute</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>6.1</b></a></li>
     3517                        <li><tt>month</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>6.1</b></a></li>
     3518                        <li><tt>obs-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>6.1</b></a></li>
     3519                        <li><tt>product</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>6.2</b></a></li>
     3520                        <li><tt>product-version</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>6.2</b></a></li>
     3521                        <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>7.7</b></a></li>
     3522                        <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>7.8</b></a></li>
     3523                        <li><tt>rfc1123-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>6.1</b></a></li>
     3524                        <li><tt>rfc850-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>6.1</b></a></li>
     3525                        <li><tt>second</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>6.1</b></a></li>
     3526                        <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>7.9</b></a></li>
     3527                        <li><tt>time-of-day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>6.1</b></a></li>
     3528                        <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>7.10</b></a></li>
     3529                        <li><tt>year</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>6.1</b></a></li>
    35413530                     </ul>
    35423531                  </li>
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