Changeset 1071 for draft-ietf-httpbis


Ignore:
Timestamp:
30/10/10 17:00:59 (10 years ago)
Author:
julian.reschke@…
Message:

From 2817: adopt Upgrade semantics for status != 101, plus status code 426 (see #240)

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

Legend:

Unmodified
Added
Removed

  • draft-ietf-httpbis/latest/p1-messaging.html

    r1069 r1071  
    404404      <meta name="dct.creator" content="Reschke, J. F.">
    405405      <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p1-messaging-latest">
    406       <meta name="dct.issued" scheme="ISO8601" content="2010-10-28">
     406      <meta name="dct.issued" scheme="ISO8601" content="2010-10-30">
    407407      <meta name="dct.replaces" content="urn:ietf:rfc:2616">
    408408      <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 1 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 1 provides an overview of HTTP and its associated terminology, defines the &#34;http&#34; and &#34;https&#34; Uniform Resource Identifier (URI) schemes, defines the generic message syntax and parsing requirements for HTTP message frames, and describes general security concerns for implementations.">
    … …  
    435435            </tr>
    436436            <tr>
    437                <td class="left">Expires: May 1, 2011</td>
     437               <td class="left">Expires: May 3, 2011</td>
    438438               <td class="right">HP</td>
    439439            </tr>
    … …  
    488488            <tr>
    489489               <td class="left"></td>
    490                <td class="right">October 28, 2010</td>
     490               <td class="right">October 30, 2010</td>
    491491            </tr>
    492492         </tbody>
    … …  
    516516         in progress”.
    517517      </p>
    518       <p>This Internet-Draft will expire on May 1, 2011.</p>
     518      <p>This Internet-Draft will expire on May 3, 2011.</p>
    519519      <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
    520520      <p>Copyright © 2010 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
    … …  
    21992199      <h2 id="rfc.section.9.8"><a href="#rfc.section.9.8">9.8</a>&nbsp;<a id="header.upgrade" href="#header.upgrade">Upgrade</a></h2>
    22002200      <p id="rfc.section.9.8.p.1">The "Upgrade" general-header field allows the client to specify what additional communication protocols it would like to use,
    2201          if the server chooses to switch protocols. Additionally, the server <em class="bcp14">MUST</em> use the Upgrade header field within a 101 (Switching Protocols) response to indicate which protocol(s) are being switched
    2202          to.
     2201         if the server chooses to switch protocols. Servers can use it to indicate what protocols they are willing to switch to.
    22032202      </p>
    22042203      <div id="rfc.figure.u.72"></div><pre class="inline"><span id="rfc.iref.g.112"></span><span id="rfc.iref.g.113"></span>  <a href="#header.upgrade" class="smpl">Upgrade</a>   = "Upgrade" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.upgrade" class="smpl">Upgrade-v</a>
    … …  
    22232222         is more appropriate to use a 3xx redirection response (<a href="p2-semantics.html#status.3xx" title="Redirection 3xx">Section 8.3</a> of <a href="#Part2" id="rfc.xref.Part2.12"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    22242223      </p>
    2225       <p id="rfc.section.9.8.p.9">This specification only defines the protocol name "HTTP" for use by the family of Hypertext Transfer Protocols, as defined
     2224      <p id="rfc.section.9.8.p.9">Servers <em class="bcp14">MUST</em> include the "Upgrade" header field in 101 (Switching Protocols) responses to indicate which protocol(s) are being switched
     2225         to, and <em class="bcp14">MUST</em> include it in 426 (Upgrade Required) responses to indicate acceptable protocols to upgrade to. Servers <em class="bcp14">MAY</em> include it in any other response to indicate that they are willing to upgrade to one of the specified protocols.
     2226      </p>
     2227      <p id="rfc.section.9.8.p.10">This specification only defines the protocol name "HTTP" for use by the family of Hypertext Transfer Protocols, as defined
    22262228         by the HTTP version rules of <a href="#http.version" title="HTTP Version">Section&nbsp;2.5</a> and future updates to this specification. Additional tokens can be registered with IANA using the registration procedure defined
    22272229         below.
    … …  
    29812983      <p id="rfc.section.B.3.p.10">Clarify exactly when close connection options must be sent. (<a href="#header.connection" id="rfc.xref.header.connection.9" title="Connection">Section&nbsp;9.1</a>)
    29822984      </p>
     2985      <p id="rfc.section.B.3.p.11">Define the semantics of the "Upgrade" header field in responses other than 101 (this was incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.2"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>). (<a href="#header.upgrade" id="rfc.xref.header.upgrade.3" title="Upgrade">Section&nbsp;9.8</a>)
     2986      </p>
    29832987      <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    29842988      <div id="rfc.figure.u.78"></div> <pre class="inline"><a href="#rule.whitespace" class="smpl">BWS</a> = OWS
    … …  
    34763480      <ul>
    34773481         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/233">http://tools.ietf.org/wg/httpbis/trac/ticket/233</a>&gt;: "Is * usable as a request-uri for new methods?"
     3482         </li>
     3483         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/240">http://tools.ietf.org/wg/httpbis/trac/ticket/240</a>&gt;: "Migrate Upgrade details from RFC2817"
    34783484         </li>
    34793485      </ul>
    … …  
    36643670                        <li class="indline1">Trailer&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.trailer.1">3.4</a>, <a class="iref" href="#rfc.xref.header.trailer.2">6.2.1</a>, <a class="iref" href="#rfc.iref.h.12"><b>9.6</b></a>, <a class="iref" href="#rfc.xref.header.trailer.3">10.1</a></li>
    36653671                        <li class="indline1">Transfer-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.transfer-encoding.1">3.3</a>, <a class="iref" href="#rfc.xref.header.transfer-encoding.2">3.3</a>, <a class="iref" href="#rfc.xref.header.transfer-encoding.3">3.4</a>, <a class="iref" href="#rfc.xref.header.transfer-encoding.4">6.2</a>, <a class="iref" href="#rfc.iref.h.13"><b>9.7</b></a>, <a class="iref" href="#rfc.xref.header.transfer-encoding.5">10.1</a></li>
    3666                         <li class="indline1">Upgrade&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.upgrade.1">3.4</a>, <a class="iref" href="#rfc.iref.h.14"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.upgrade.2">10.1</a></li>
     3672                        <li class="indline1">Upgrade&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.upgrade.1">3.4</a>, <a class="iref" href="#rfc.iref.h.14"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.upgrade.2">10.1</a>, <a class="iref" href="#rfc.xref.header.upgrade.3">B.3</a></li>
    36673673                        <li class="indline1">Via&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.via.1">3.4</a>, <a class="iref" href="#rfc.iref.h.15"><b>9.9</b></a>, <a class="iref" href="#rfc.xref.header.via.2">10.1</a></li>
    36683674                     </ul>
    … …  
    37643770                  <li class="indline1"><em>RFC2145</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2145.1">2.5</a>, <a class="iref" href="#rfc.xref.RFC2145.2">2.5</a>, <a class="iref" href="#RFC2145"><b>13.2</b></a></li>
    37653771                  <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#rfc.xref.RFC2616.2">12</a>, <a class="iref" href="#RFC2616"><b>13.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.3">D.1</a></li>
    3766                   <li class="indline1"><em>RFC2817</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.5</a>, <a class="iref" href="#RFC2817"><b>13.2</b></a><ul class="ind">
     3772                  <li class="indline1"><em>RFC2817</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.5</a>, <a class="iref" href="#RFC2817"><b>13.2</b></a>, <a class="iref" href="#rfc.xref.RFC2817.2">B.3</a><ul class="ind">
    37673773                        <li class="indline1"><em>Section 7.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.5</a></li>
    37683774                     </ul>
    … …  
    38203826            </li>
    38213827            <li class="indline0"><a id="rfc.index.U" href="#rfc.index.U"><b>U</b></a><ul class="ind">
    3822                   <li class="indline1">Upgrade header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.upgrade.1">3.4</a>, <a class="iref" href="#rfc.iref.u.5"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.upgrade.2">10.1</a></li>
     3828                  <li class="indline1">Upgrade header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.upgrade.1">3.4</a>, <a class="iref" href="#rfc.iref.u.5"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.upgrade.2">10.1</a>, <a class="iref" href="#rfc.xref.header.upgrade.3">B.3</a></li>
    38233829                  <li class="indline1">upstream&nbsp;&nbsp;<a class="iref" href="#rfc.iref.u.2"><b>2.2</b></a></li>
    38243830                  <li class="indline1">URI scheme&nbsp;&nbsp;

  • draft-ietf-httpbis/latest/p1-messaging.xml

    r1069 r1071  
    32473247   The "Upgrade" general-header field allows the client to specify what
    32483248   additional communication protocols it would like to use, if the server
    3249    chooses to switch protocols. Additionally, the server &MUST; use the Upgrade
    3250    header field within a 101 (Switching Protocols) response to indicate which
    3251    protocol(s) are being switched to.
     3249   chooses to switch protocols. Servers can use it to indicate what protocols
     3250   they are willing to switch to.
    32523251</t>
    32533252<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Upgrade"/><iref primary="true" item="Grammar" subitem="Upgrade-v"/>
    … …  
    32943293   protocol on a different connection. For that purpose, it is more
    32953294   appropriate to use a 3xx redirection response (&status-3xx;).
     3295</t>
     3296<t>
     3297   Servers &MUST; include the "Upgrade" header field in 101 (Switching
     3298   Protocols) responses to indicate which protocol(s) are being switched to,
     3299   and &MUST; include it in 426 (Upgrade Required) responses to indicate
     3300   acceptable protocols to upgrade to. Servers &MAY; include it in any other
     3301   response to indicate that they are willing to upgrade to one of the
     3302   specified protocols.
    32963303</t>
    32973304<t>
    … …  
    48934900  (<xref target="header.connection"/>)
    48944901</t>
     4902<t>
     4903  Define the semantics of the "Upgrade" header field in responses other than
     4904  101 (this was incorporated from <xref target="RFC2817"/>).
     4905  (<xref target="header.upgrade"/>)
     4906</t>
    48954907</section>
    48964908</section>
    … …  
    56945706      "Is * usable as a request-uri for new methods?"
    56955707    </t>
     5708    <t>
     5709      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/240"/>:
     5710      "Migrate Upgrade details from RFC2817"
     5711    </t>
    56965712  </list>
    56975713</t>

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

    r1070 r1071  
    626626                     <li class="tocline1">8.4.17&nbsp;&nbsp;&nbsp;<a href="#status.416">416 Requested Range Not Satisfiable</a></li>
    627627                     <li class="tocline1">8.4.18&nbsp;&nbsp;&nbsp;<a href="#status.417">417 Expectation Failed</a></li>
     628                     <li class="tocline1">8.4.19&nbsp;&nbsp;&nbsp;<a href="#status.426">426 Upgrade Required</a></li>
    628629                  </ul>
    629630               </li>
    … …  
    884885     / "416"  ; <a href="#Part5" id="rfc.xref.Part5.8"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#status.416" title="416 Requested Range Not Satisfiable">Section 3.2</a>: Requested range not satisfiable
    885886     / "417"  ; <a href="#status.417" id="rfc.xref.status.417.1" title="417 Expectation Failed">Section&nbsp;8.4.18</a>: Expectation Failed
     887     / "426"  ; <a href="#status.426" id="rfc.xref.status.426.1" title="426 Upgrade Required">Section&nbsp;8.4.19</a>: Upgrade Required
    886888     / "500"  ; <a href="#status.500" id="rfc.xref.status.500.1" title="500 Internal Server Error">Section&nbsp;8.5.1</a>: Internal Server Error
    887889     / "501"  ; <a href="#status.501" id="rfc.xref.status.501.1" title="501 Not Implemented">Section&nbsp;8.5.2</a>: Not Implemented
    … …  
    15401542         not be met by the next-hop server.
    15411543      </p>
     1544      <div id="rfc.iref.60"></div>
     1545      <div id="rfc.iref.s.37"></div>
     1546      <h3 id="rfc.section.8.4.19"><a href="#rfc.section.8.4.19">8.4.19</a>&nbsp;<a id="status.426" href="#status.426">426 Upgrade Required</a></h3>
     1547      <p id="rfc.section.8.4.19.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 9.8</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.
     1548      </p>
     1549      <div id="rfc.figure.u.14"></div>
     1550      <p>Example:</p>  <pre class="text2">HTTP/1.1 426 Upgrade Required
     1551Upgrade: HTTP/2.0
     1552Connection: Upgrade
     1553
     1554</pre><p id="rfc.section.8.4.19.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
     1555         alternative courses which may be available to the user.
     1556      </p>
    15421557      <h2 id="rfc.section.8.5"><a href="#rfc.section.8.5">8.5</a>&nbsp;<a id="status.5xx" href="#status.5xx">Server Error 5xx</a></h2>
    15431558      <p id="rfc.section.8.5.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
    … …  
    15451560         User agents <em class="bcp14">SHOULD</em> display any included representation to the user. These response codes are applicable to any request method.
    15461561      </p>
    1547       <div id="rfc.iref.60"></div>
    1548       <div id="rfc.iref.s.37"></div>
     1562      <div id="rfc.iref.61"></div>
     1563      <div id="rfc.iref.s.38"></div>
    15491564      <h3 id="rfc.section.8.5.1"><a href="#rfc.section.8.5.1">8.5.1</a>&nbsp;<a id="status.500" href="#status.500">500 Internal Server Error</a></h3>
    15501565      <p id="rfc.section.8.5.1.p.1">The server encountered an unexpected condition which prevented it from fulfilling the request.</p>
    1551       <div id="rfc.iref.61"></div>
    1552       <div id="rfc.iref.s.38"></div>
     1566      <div id="rfc.iref.62"></div>
     1567      <div id="rfc.iref.s.39"></div>
    15531568      <h3 id="rfc.section.8.5.2"><a href="#rfc.section.8.5.2">8.5.2</a>&nbsp;<a id="status.501" href="#status.501">501 Not Implemented</a></h3>
    15541569      <p id="rfc.section.8.5.2.p.1">The server does not support the functionality required to fulfill the request. This is the appropriate response when the server
    15551570         does not recognize the request method and is not capable of supporting it for any resource.
    15561571      </p>
    1557       <div id="rfc.iref.62"></div>
    1558       <div id="rfc.iref.s.39"></div>
     1572      <div id="rfc.iref.63"></div>
     1573      <div id="rfc.iref.s.40"></div>
    15591574      <h3 id="rfc.section.8.5.3"><a href="#rfc.section.8.5.3">8.5.3</a>&nbsp;<a id="status.502" href="#status.502">502 Bad Gateway</a></h3>
    15601575      <p id="rfc.section.8.5.3.p.1">The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting
    15611576         to fulfill the request.
    15621577      </p>
    1563       <div id="rfc.iref.63"></div>
    1564       <div id="rfc.iref.s.40"></div>
     1578      <div id="rfc.iref.64"></div>
     1579      <div id="rfc.iref.s.41"></div>
    15651580      <h3 id="rfc.section.8.5.4"><a href="#rfc.section.8.5.4">8.5.4</a>&nbsp;<a id="status.503" href="#status.503">503 Service Unavailable</a></h3>
    15661581      <p id="rfc.section.8.5.4.p.1">The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication
    … …  
    15721587         </p>
    15731588      </div>
    1574       <div id="rfc.iref.64"></div>
    1575       <div id="rfc.iref.s.41"></div>
     1589      <div id="rfc.iref.65"></div>
     1590      <div id="rfc.iref.s.42"></div>
    15761591      <h3 id="rfc.section.8.5.5"><a href="#rfc.section.8.5.5">8.5.5</a>&nbsp;<a id="status.504" href="#status.504">504 Gateway Timeout</a></h3>
    15771592      <p id="rfc.section.8.5.5.p.1">The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the
    … …  
    15821597         </p>
    15831598      </div>
    1584       <div id="rfc.iref.65"></div>
    1585       <div id="rfc.iref.s.42"></div>
     1599      <div id="rfc.iref.66"></div>
     1600      <div id="rfc.iref.s.43"></div>
    15861601      <h3 id="rfc.section.8.5.6"><a href="#rfc.section.8.5.6">8.5.6</a>&nbsp;<a id="status.505" href="#status.505">505 HTTP Version Not Supported</a></h3>
    15871602      <p id="rfc.section.8.5.6.p.1">The server does not support, or refuses to support, the protocol version that was used in the request message. The server
    15881603         is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described
    1589          in <a href="p1-messaging.html#http.version" title="HTTP Version">Section 2.5</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>, 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.
     1604         in <a href="p1-messaging.html#http.version" title="HTTP Version">Section 2.5</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.
    15901605      </p>
    15911606      <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Field Definitions</a></h1>
    … …  
    15971612         this field is strictly to inform the recipient of valid methods associated with the resource.
    15981613      </p>
    1599       <div id="rfc.figure.u.14"></div><pre class="inline"><span id="rfc.iref.g.9"></span><span id="rfc.iref.g.10"></span>  <a href="#header.allow" class="smpl">Allow</a>   = "Allow" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.allow" class="smpl">Allow-v</a>
     1614      <div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.9"></span><span id="rfc.iref.g.10"></span>  <a href="#header.allow" class="smpl">Allow</a>   = "Allow" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.allow" class="smpl">Allow-v</a>
    16001615  <a href="#header.allow" class="smpl">Allow-v</a> = #<a href="#method" class="smpl">Method</a>
    16011616</pre><p id="rfc.section.9.1.p.3">Example of use:</p>
    1602       <div id="rfc.figure.u.15"></div><pre class="text">  Allow: GET, HEAD, PUT
     1617      <div id="rfc.figure.u.16"></div><pre class="text">  Allow: GET, HEAD, PUT
    16031618</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>
    16041619      <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
    … …  
    16091624      <h2 id="rfc.section.9.2"><a href="#rfc.section.9.2">9.2</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
    16101625      <p id="rfc.section.9.2.p.1">The "Expect" request-header field is used to indicate that particular server behaviors are required by the client.</p>
    1611       <div id="rfc.figure.u.16"></div><pre class="inline"><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="#header.expect" class="smpl">Expect</a>       = "Expect" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.expect" class="smpl">Expect-v</a>
     1626      <div id="rfc.figure.u.17"></div><pre class="inline"><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="#header.expect" class="smpl">Expect</a>       = "Expect" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.expect" class="smpl">Expect-v</a>
    16121627  <a href="#header.expect" class="smpl">Expect-v</a>     = 1#<a href="#header.expect" class="smpl">expectation</a>
    16131628 
    … …  
    16291644      </p>
    16301645      <p id="rfc.section.9.2.p.7">Many older HTTP/1.0 and HTTP/1.1 applications do not understand the Expect header field.</p>
    1631       <p id="rfc.section.9.2.p.8">See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</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> for the use of the 100 (Continue) status code.
     1646      <p id="rfc.section.9.2.p.8">See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</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 the use of the 100 (Continue) status code.
    16321647      </p>
    16331648      <div id="rfc.iref.f.1"></div>
    … …  
    16361651      <p id="rfc.section.9.3.p.1">The "From" request-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.RFC5322.1"><cite title="Internet Message Format">[RFC5322]</cite></a>:
    16371652      </p>
    1638       <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.16"></span><span id="rfc.iref.g.17"></span>  <a href="#header.from" class="smpl">From</a>    = "From" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.from" class="smpl">From-v</a>
     1653      <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.16"></span><span id="rfc.iref.g.17"></span>  <a href="#header.from" class="smpl">From</a>    = "From" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.from" class="smpl">From-v</a>
    16391654  <a href="#header.from" class="smpl">From-v</a>  = <a href="#header.from" class="smpl">mailbox</a>
    16401655 
    16411656  <a href="#header.from" class="smpl">mailbox</a> = &lt;mailbox, defined in <a href="#RFC5322" id="rfc.xref.RFC5322.2"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a>&gt;
    16421657</pre><p id="rfc.section.9.3.p.3">An example is:</p>
    1643       <div id="rfc.figure.u.18"></div><pre class="text">  From: webmaster@example.org
     1658      <div id="rfc.figure.u.19"></div><pre class="text">  From: webmaster@example.org
    16441659</pre><p id="rfc.section.9.3.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
    16451660         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
    … …  
    16641679      <p id="rfc.section.9.4.p.3">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>).
    16651680      </p>
    1666       <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span>  <a href="#header.location" class="smpl">Location</a>       = "Location" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.location" class="smpl">Location-v</a>
     1681      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span>  <a href="#header.location" class="smpl">Location</a>       = "Location" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.location" class="smpl">Location-v</a>
    16671682  <a href="#header.location" class="smpl">Location-v</a>     = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
    1668 </pre><div id="rfc.figure.u.20"></div>
     1683</pre><div id="rfc.figure.u.21"></div>
    16691684      <p>Examples are:</p>  <pre class="text">  Location: http://www.example.org/pub/WWW/People.html#tim
    1670 </pre><div id="rfc.figure.u.21"></div><pre class="text">  Location: /index.html
     1685</pre><div id="rfc.figure.u.22"></div><pre class="text">  Location: /index.html
    16711686</pre><p id="rfc.section.9.4.p.7">There are circumstances in which a fragment identifier in a Location URI would not be appropriate: </p>
    16721687      <ul>
    … …  
    16901705         is attempting to trace a request which appears to be failing or looping in mid-chain.
    16911706      </p>
    1692       <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.20"></span><span id="rfc.iref.g.21"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a>   = "Max-Forwards" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a>
     1707      <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.20"></span><span id="rfc.iref.g.21"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a>   = "Max-Forwards" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a>
    16931708  <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
    16941709</pre><p id="rfc.section.9.5.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
    … …  
    17111726         non-HTTP URIs (e.g., FTP).
    17121727      </p>
    1713       <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  <a href="#header.referer" class="smpl">Referer</a>        = "Referer" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.referer" class="smpl">Referer-v</a>
     1728      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  <a href="#header.referer" class="smpl">Referer</a>        = "Referer" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.referer" class="smpl">Referer-v</a>
    17141729  <a href="#header.referer" class="smpl">Referer-v</a>      = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
    17151730</pre><p id="rfc.section.9.6.p.5">Example:</p>
    1716       <div id="rfc.figure.u.24"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
     1731      <div id="rfc.figure.u.25"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
    17171732</pre><p id="rfc.section.9.6.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.
    17181733      </p>
    … …  
    17251740      </p>
    17261741      <p id="rfc.section.9.7.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>
    1727       <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  <a href="#header.retry-after" class="smpl">Retry-After</a>   = "Retry-After" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.retry-after" class="smpl">Retry-After-v</a>
     1742      <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  <a href="#header.retry-after" class="smpl">Retry-After</a>   = "Retry-After" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.retry-after" class="smpl">Retry-After-v</a>
    17281743  <a href="#header.retry-after" class="smpl">Retry-After-v</a> = <a href="#abnf.dependencies" class="smpl">HTTP-date</a> / <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>
    17291744</pre><div id="rule.delta-seconds">
    17301745         <p id="rfc.section.9.7.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
    17311746      </div>
    1732       <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
     1747      <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
    17331748</pre><p id="rfc.section.9.7.p.6">Two examples of its use are</p>
    1734       <div id="rfc.figure.u.27"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
     1749      <div id="rfc.figure.u.28"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
    17351750  Retry-After: 120
    17361751</pre><p id="rfc.section.9.7.p.8">In the latter example, the delay is 2 minutes.</p>
    1737       <div id="rfc.iref.s.43"></div>
     1752      <div id="rfc.iref.s.44"></div>
    17381753      <div id="rfc.iref.h.9"></div>
    17391754      <h2 id="rfc.section.9.8"><a href="#rfc.section.9.8">9.8</a>&nbsp;<a id="header.server" href="#header.server">Server</a></h2>
    17401755      <p id="rfc.section.9.8.p.1">The "Server" response-header field contains information about the software used by the origin server to handle the request.</p>
    1741       <p id="rfc.section.9.8.p.2">The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 6.3</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>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</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>) identifying the server and any significant subproducts. The product tokens are listed in order of their significance for
     1756      <p id="rfc.section.9.8.p.2">The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 6.3</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>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</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>) identifying the server and any significant subproducts. The product tokens are listed in order of their significance for
    17421757         identifying the application.
    17431758      </p>
    1744       <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span>  <a href="#header.server" class="smpl">Server</a>         = "Server" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.server" class="smpl">Server-v</a>
     1759      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span>  <a href="#header.server" class="smpl">Server</a>         = "Server" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.server" class="smpl">Server-v</a>
    17451760  <a href="#header.server" class="smpl">Server-v</a>       = <a href="#abnf.dependencies" class="smpl">product</a>
    17461761                   *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    17471762</pre><p id="rfc.section.9.8.p.4">Example:</p>
    1748       <div id="rfc.figure.u.29"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
    1749 </pre><p id="rfc.section.9.8.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server response-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 9.9</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>).
     1763      <div id="rfc.figure.u.30"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
     1764</pre><p id="rfc.section.9.8.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server response-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 9.9</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>).
    17501765      </p>
    17511766      <div class="note" id="rfc.section.9.8.p.7">
    … …  
    17631778         user agent limitations.
    17641779      </p>
    1765       <p id="rfc.section.9.9.p.3">The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 6.3</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>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</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>) identifying the agent and its significant subproducts. By convention, the product tokens are listed in order of their significance
     1780      <p id="rfc.section.9.9.p.3">The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 6.3</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 comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</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>) identifying the agent and its significant subproducts. By convention, the product tokens are listed in order of their significance
    17661781         for identifying the application.
    17671782      </p>
    … …  
    17741789         doing so makes the field value more difficult to parse.
    17751790      </p>
    1776       <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a>     = "User-Agent" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.user-agent" class="smpl">User-Agent-v</a>
     1791      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a>     = "User-Agent" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.user-agent" class="smpl">User-Agent-v</a>
    17771792  <a href="#header.user-agent" class="smpl">User-Agent-v</a>   = <a href="#abnf.dependencies" class="smpl">product</a>
    17781793                   *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    17791794</pre><p id="rfc.section.9.9.p.7">Example:</p>
    1780       <div id="rfc.figure.u.31"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     1795      <div id="rfc.figure.u.32"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    17811796</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>
    17821797      <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>
    … …  
    20412056                  <td class="left">Expectation Failed</td>
    20422057                  <td class="left"> <a href="#status.417" id="rfc.xref.status.417.2" title="417 Expectation Failed">Section&nbsp;8.4.18</a>
     2058                  </td>
     2059               </tr>
     2060               <tr>
     2061                  <td class="left">426</td>
     2062                  <td class="left">Upgrade Required</td>
     2063                  <td class="left"> <a href="#status.426" id="rfc.xref.status.426.2" title="426 Upgrade Required">Section&nbsp;8.4.19</a>
    20432064                  </td>
    20442065               </tr>
    … …  
    23462367         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;8.3.6</a>)
    23472368      </p>
    2348       <p id="rfc.section.A.p.6">Reclassify "Allow" as response header field, removing the option to specify it in a PUT request. Relax the server requirement
     2369      <p id="rfc.section.A.p.6">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;8.4.19</a>)
     2370      </p>
     2371      <p id="rfc.section.A.p.7">Reclassify "Allow" as response header field, removing the option to specify it in a PUT request. Relax the server requirement
    23492372         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>)
    23502373      </p>
    2351       <p id="rfc.section.A.p.7">Correct syntax of Location header field to allow URI references (including relative references and fragments), as referred
     2374      <p id="rfc.section.A.p.8">Correct syntax of Location header field to allow URI references (including relative references and fragments), as referred
    23522375         symbol "absoluteURI" wasn't what was expected, and add some clarifications as to when use of fragments would not be appropriate.
    23532376         (<a href="#header.location" id="rfc.xref.header.location.4" title="Location">Section&nbsp;9.4</a>)
    23542377      </p>
    2355       <p id="rfc.section.A.p.8">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;9.5</a>)
    2356       </p>
    2357       <p id="rfc.section.A.p.9">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;9.6</a>)
    2358       </p>
    2359       <p id="rfc.section.A.p.10">In the description of the Server header field, the Via field was described as a SHOULD. The requirement was and is stated
    2360          correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 9.9</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>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section&nbsp;9.8</a>)
     2378      <p id="rfc.section.A.p.9">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;9.5</a>)
     2379      </p>
     2380      <p id="rfc.section.A.p.10">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;9.6</a>)
     2381      </p>
     2382      <p id="rfc.section.A.p.11">In the description of the Server header field, the Via field was described as a SHOULD. The requirement was and is stated
     2383         correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 9.9</a> of <a href="#Part1" id="rfc.xref.Part1.38"><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;9.8</a>)
    23612384      </p>
    23622385      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    2363       <div id="rfc.figure.u.32"></div> <pre class="inline"><a href="#abnf.dependencies" class="smpl">Accept</a> = &lt;Accept, defined in [Part3], Section 6.1&gt;
     2386      <div id="rfc.figure.u.33"></div> <pre class="inline"><a href="#abnf.dependencies" class="smpl">Accept</a> = &lt;Accept, defined in [Part3], Section 6.1&gt;
    23642387<a href="#abnf.dependencies" class="smpl">Accept-Charset</a> = &lt;Accept-Charset, defined in [Part3], Section 6.2&gt;
    23652388<a href="#abnf.dependencies" class="smpl">Accept-Encoding</a> = &lt;Accept-Encoding, defined in [Part3], Section 6.3&gt;
    … …  
    24252448 "307" / "400" / "401" / "402" / "403" / "404" / "405" / "406" /
    24262449 "407" / "408" / "409" / "410" / "411" / "412" / "413" / "414" /
    2427  "415" / "416" / "417" / "500" / "501" / "502" / "503" / "504" /
    2428  "505" / extension-code
     2450 "415" / "416" / "417" / "426" / "500" / "501" / "502" / "503" /
     2451 "504" / "505" / extension-code
    24292452
    24302453<a href="#abnf.dependencies" class="smpl">TE</a> = &lt;TE, defined in [Part1], Section 9.5&gt;
    … …  
    24702493
    24712494<a href="#core.rules" class="smpl">token</a> = &lt;token, defined in [Part1], Section 1.2.2&gt;
    2472 </pre> <div id="rfc.figure.u.33"></div>
     2495</pre> <div id="rfc.figure.u.34"></div>
    24732496      <p>ABNF diagnostics:</p><pre class="inline">; Reason-Phrase defined but not used
    24742497; Status-Code defined but not used
    … …  
    26812704         </li>
    26822705         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/239">http://tools.ietf.org/wg/httpbis/trac/ticket/239</a>&gt;: "Migrate CONNECT from RFC2817 to p2"
     2706         </li>
     2707         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/240">http://tools.ietf.org/wg/httpbis/trac/ticket/240</a>&gt;: "Migrate Upgrade details from RFC2817"
    26832708         </li>
    26842709      </ul>
    … …  
    27332758                  <li class="indline1">416 Requested Range Not Satisfiable (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.iref.58"><b>8.4.17</b></a></li>
    27342759                  <li class="indline1">417 Expectation Failed (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.417.1">4</a>, <a class="iref" href="#rfc.iref.59"><b>8.4.18</b></a>, <a class="iref" href="#rfc.xref.status.417.2">10.2</a></li>
     2760                  <li class="indline1">426 Upgrade Required (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.426.1">4</a>, <a class="iref" href="#rfc.iref.60"><b>8.4.19</b></a>, <a class="iref" href="#rfc.xref.status.426.2">10.2</a>, <a class="iref" href="#rfc.xref.status.426.3">A</a></li>
    27352761               </ul>
    27362762            </li>
    27372763            <li class="indline0"><a id="rfc.index.5" href="#rfc.index.5"><b>5</b></a><ul class="ind">
    2738                   <li class="indline1">500 Internal Server Error (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.500.1">4</a>, <a class="iref" href="#rfc.iref.60"><b>8.5.1</b></a>, <a class="iref" href="#rfc.xref.status.500.2">10.2</a></li>
    2739                   <li class="indline1">501 Not Implemented (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.501.1">4</a>, <a class="iref" href="#rfc.iref.61"><b>8.5.2</b></a>, <a class="iref" href="#rfc.xref.status.501.2">10.2</a></li>
    2740                   <li class="indline1">502 Bad Gateway (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.502.1">4</a>, <a class="iref" href="#rfc.iref.62"><b>8.5.3</b></a>, <a class="iref" href="#rfc.xref.status.502.2">10.2</a></li>
    2741                   <li class="indline1">503 Service Unavailable (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.503.1">4</a>, <a class="iref" href="#rfc.iref.63"><b>8.5.4</b></a>, <a class="iref" href="#rfc.xref.status.503.2">10.2</a></li>
    2742                   <li class="indline1">504 Gateway Timeout (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.504.1">4</a>, <a class="iref" href="#rfc.iref.64"><b>8.5.5</b></a>, <a class="iref" href="#rfc.xref.status.504.2">10.2</a></li>
    2743                   <li class="indline1">505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.505.1">4</a>, <a class="iref" href="#rfc.iref.65"><b>8.5.6</b></a>, <a class="iref" href="#rfc.xref.status.505.2">10.2</a></li>
     2764                  <li class="indline1">500 Internal Server Error (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.500.1">4</a>, <a class="iref" href="#rfc.iref.61"><b>8.5.1</b></a>, <a class="iref" href="#rfc.xref.status.500.2">10.2</a></li>
     2765                  <li class="indline1">501 Not Implemented (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.501.1">4</a>, <a class="iref" href="#rfc.iref.62"><b>8.5.2</b></a>, <a class="iref" href="#rfc.xref.status.501.2">10.2</a></li>
     2766                  <li class="indline1">502 Bad Gateway (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.502.1">4</a>, <a class="iref" href="#rfc.iref.63"><b>8.5.3</b></a>, <a class="iref" href="#rfc.xref.status.502.2">10.2</a></li>
     2767                  <li class="indline1">503 Service Unavailable (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.503.1">4</a>, <a class="iref" href="#rfc.iref.64"><b>8.5.4</b></a>, <a class="iref" href="#rfc.xref.status.503.2">10.2</a></li>
     2768                  <li class="indline1">504 Gateway Timeout (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.504.1">4</a>, <a class="iref" href="#rfc.iref.65"><b>8.5.5</b></a>, <a class="iref" href="#rfc.xref.status.504.2">10.2</a></li>
     2769                  <li class="indline1">505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.505.1">4</a>, <a class="iref" href="#rfc.iref.66"><b>8.5.6</b></a>, <a class="iref" href="#rfc.xref.status.505.2">10.2</a></li>
    27442770               </ul>
    27452771            </li>
    … …  
    28472873            </li>
    28482874            <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind">
    2849                   <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">1</a>, <a class="iref" href="#rfc.xref.Part1.2">1.2</a>, <a class="iref" href="#rfc.xref.Part1.3">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.4">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.5">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.6">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.7">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.8">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.9">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.10">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.11">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.12">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.13">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.14">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.15">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.16">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.18">2.1.1</a>, <a class="iref" href="#rfc.xref.Part1.19">3</a>, <a class="iref" href="#rfc.xref.Part1.20">3</a>, <a class="iref" href="#rfc.xref.Part1.21">5</a>, <a class="iref" href="#rfc.xref.Part1.22">6</a>, <a class="iref" href="#rfc.xref.Part1.23">6.1</a>, <a class="iref" href="#rfc.xref.Part1.24">7.8</a>, <a class="iref" href="#rfc.xref.Part1.25">7.8</a>, <a class="iref" href="#rfc.xref.Part1.26">7.9</a>, <a class="iref" href="#rfc.xref.Part1.27">8.1.1</a>, <a class="iref" href="#rfc.xref.Part1.28">8.1.2</a>, <a class="iref" href="#rfc.xref.Part1.29">8.2.6</a>, <a class="iref" href="#rfc.xref.Part1.30">8.5.6</a>, <a class="iref" href="#rfc.xref.Part1.31">9.2</a>, <a class="iref" href="#rfc.xref.Part1.32">9.8</a>, <a class="iref" href="#rfc.xref.Part1.33">9.8</a>, <a class="iref" href="#rfc.xref.Part1.34">9.8</a>, <a class="iref" href="#rfc.xref.Part1.35">9.9</a>, <a class="iref" href="#rfc.xref.Part1.36">9.9</a>, <a class="iref" href="#Part1"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part1.37">A</a><ul class="ind">
     2875                  <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">1</a>, <a class="iref" href="#rfc.xref.Part1.2">1.2</a>, <a class="iref" href="#rfc.xref.Part1.3">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.4">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.5">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.6">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.7">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.8">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.9">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.10">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.11">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.12">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.13">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.14">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.15">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.16">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.18">2.1.1</a>, <a class="iref" href="#rfc.xref.Part1.19">3</a>, <a class="iref" href="#rfc.xref.Part1.20">3</a>, <a class="iref" href="#rfc.xref.Part1.21">5</a>, <a class="iref" href="#rfc.xref.Part1.22">6</a>, <a class="iref" href="#rfc.xref.Part1.23">6.1</a>, <a class="iref" href="#rfc.xref.Part1.24">7.8</a>, <a class="iref" href="#rfc.xref.Part1.25">7.8</a>, <a class="iref" href="#rfc.xref.Part1.26">7.9</a>, <a class="iref" href="#rfc.xref.Part1.27">8.1.1</a>, <a class="iref" href="#rfc.xref.Part1.28">8.1.2</a>, <a class="iref" href="#rfc.xref.Part1.29">8.2.6</a>, <a class="iref" href="#rfc.xref.Part1.30">8.4.19</a>, <a class="iref" href="#rfc.xref.Part1.31">8.5.6</a>, <a class="iref" href="#rfc.xref.Part1.32">9.2</a>, <a class="iref" href="#rfc.xref.Part1.33">9.8</a>, <a class="iref" href="#rfc.xref.Part1.34">9.8</a>, <a class="iref" href="#rfc.xref.Part1.35">9.8</a>, <a class="iref" href="#rfc.xref.Part1.36">9.9</a>, <a class="iref" href="#rfc.xref.Part1.37">9.9</a>, <a class="iref" href="#Part1"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part1.38">A</a><ul class="ind">
    28502876                        <li class="indline1"><em>Section 1.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.2">1.2</a></li>
    28512877                        <li class="indline1"><em>Section 1.2.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.3">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.4">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.5">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.6">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.7">1.2.1</a>, <a class="iref" href="#rfc.xref.Part1.8">1.2.1</a></li>
    2852                         <li class="indline1"><em>Section 2.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.30">8.5.6</a></li>
     2878                        <li class="indline1"><em>Section 2.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.31">8.5.6</a></li>
    28532879                        <li class="indline1"><em>Section 2.6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.9">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.11">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.13">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.16">1.2.2</a></li>
    2854                         <li class="indline1"><em>Section 3.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.10">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.33">9.8</a>, <a class="iref" href="#rfc.xref.Part1.36">9.9</a></li>
     2880                        <li class="indline1"><em>Section 3.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.10">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.34">9.8</a>, <a class="iref" href="#rfc.xref.Part1.37">9.9</a></li>
    28552881                        <li class="indline1"><em>Section 3.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.18">2.1.1</a>, <a class="iref" href="#rfc.xref.Part1.22">6</a>, <a class="iref" href="#rfc.xref.Part1.29">8.2.6</a></li>
    28562882                        <li class="indline1"><em>Section 4.1.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.26">7.9</a></li>
    28572883                        <li class="indline1"><em>Section 4.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.21">5</a>, <a class="iref" href="#rfc.xref.Part1.23">6.1</a></li>
    28582884                        <li class="indline1"><em>Section 6.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.12">1.2.2</a></li>
    2859                         <li class="indline1"><em>Section 6.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.14">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.32">9.8</a>, <a class="iref" href="#rfc.xref.Part1.35">9.9</a></li>
    2860                         <li class="indline1"><em>Section 7.2.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.27">8.1.1</a>, <a class="iref" href="#rfc.xref.Part1.31">9.2</a></li>
     2885                        <li class="indline1"><em>Section 6.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.14">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.33">9.8</a>, <a class="iref" href="#rfc.xref.Part1.36">9.9</a></li>
     2886                        <li class="indline1"><em>Section 7.2.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.27">8.1.1</a>, <a class="iref" href="#rfc.xref.Part1.32">9.2</a></li>
    28612887                        <li class="indline1"><em>Section 9.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.19">3</a></li>
    28622888                        <li class="indline1"><em>Section 9.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.15">1.2.2</a>, <a class="iref" href="#rfc.xref.Part1.20">3</a></li>
    2863                         <li class="indline1"><em>Section 9.8</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.28">8.1.2</a></li>
    2864                         <li class="indline1"><em>Section 9.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.24">7.8</a>, <a class="iref" href="#rfc.xref.Part1.34">9.8</a>, <a class="iref" href="#rfc.xref.Part1.37">A</a></li>
     2889                        <li class="indline1"><em>Section 9.8</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.28">8.1.2</a>, <a class="iref" href="#rfc.xref.Part1.30">8.4.19</a></li>
     2890                        <li class="indline1"><em>Section 9.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.24">7.8</a>, <a class="iref" href="#rfc.xref.Part1.35">9.8</a>, <a class="iref" href="#rfc.xref.Part1.38">A</a></li>
    28652891                        <li class="indline1"><em>Section 10.3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.25">7.8</a></li>
    28662892                     </ul>
    … …  
    29342960                     </ul>
    29352961                  </li>
    2936                   <li class="indline1"><em>RFC2817</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.2</a>, <a class="iref" href="#RFC2817"><b>13.2</b></a>, <a class="iref" href="#rfc.xref.RFC2817.2">A</a>, <a class="iref" href="#rfc.xref.RFC2817.3">A</a><ul class="ind">
     2962                  <li class="indline1"><em>RFC2817</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.2</a>, <a class="iref" href="#RFC2817"><b>13.2</b></a>, <a class="iref" href="#rfc.xref.RFC2817.2">A</a>, <a class="iref" href="#rfc.xref.RFC2817.3">A</a>, <a class="iref" href="#rfc.xref.RFC2817.4">A</a><ul class="ind">
    29372963                        <li class="indline1"><em>Section 7.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2817.1">10.2</a>, <a class="iref" href="#rfc.xref.RFC2817.2">A</a></li>
    29382964                     </ul>
    … …  
    29602986            <li class="indline0"><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul class="ind">
    29612987                  <li class="indline1">Safe Methods&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.1"><b>7.1.1</b></a></li>
    2962                   <li class="indline1">Server header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.server.1">5</a>, <a class="iref" href="#rfc.iref.s.43"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.server.2">10.3</a>, <a class="iref" href="#rfc.xref.header.server.3">11.1</a>, <a class="iref" href="#rfc.xref.header.server.4">A</a></li>
     2988                  <li class="indline1">Server header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.server.1">5</a>, <a class="iref" href="#rfc.iref.s.44"><b>9.8</b></a>, <a class="iref" href="#rfc.xref.header.server.2">10.3</a>, <a class="iref" href="#rfc.xref.header.server.3">11.1</a>, <a class="iref" href="#rfc.xref.header.server.4">A</a></li>
    29632989                  <li class="indline1">Status Codes&nbsp;&nbsp;
    29642990                     <ul class="ind">
    … …  
    29983024                        <li class="indline1">416 Requested Range Not Satisfiable&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.35"><b>8.4.17</b></a></li>
    29993025                        <li class="indline1">417 Expectation Failed&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.417.1">4</a>, <a class="iref" href="#rfc.iref.s.36"><b>8.4.18</b></a>, <a class="iref" href="#rfc.xref.status.417.2">10.2</a></li>
    3000                         <li class="indline1">500 Internal Server Error&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.500.1">4</a>, <a class="iref" href="#rfc.iref.s.37"><b>8.5.1</b></a>, <a class="iref" href="#rfc.xref.status.500.2">10.2</a></li>
    3001                         <li class="indline1">501 Not Implemented&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.501.1">4</a>, <a class="iref" href="#rfc.iref.s.38"><b>8.5.2</b></a>, <a class="iref" href="#rfc.xref.status.501.2">10.2</a></li>
    3002                         <li class="indline1">502 Bad Gateway&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.502.1">4</a>, <a class="iref" href="#rfc.iref.s.39"><b>8.5.3</b></a>, <a class="iref" href="#rfc.xref.status.502.2">10.2</a></li>
    3003                         <li class="indline1">503 Service Unavailable&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.503.1">4</a>, <a class="iref" href="#rfc.iref.s.40"><b>8.5.4</b></a>, <a class="iref" href="#rfc.xref.status.503.2">10.2</a></li>
    3004                         <li class="indline1">504 Gateway Timeout&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.504.1">4</a>, <a class="iref" href="#rfc.iref.s.41"><b>8.5.5</b></a>, <a class="iref" href="#rfc.xref.status.504.2">10.2</a></li>
    3005                         <li class="indline1">505 HTTP Version Not Supported&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.505.1">4</a>, <a class="iref" href="#rfc.iref.s.42"><b>8.5.6</b></a>, <a class="iref" href="#rfc.xref.status.505.2">10.2</a></li>
     3026                        <li class="indline1">426 Upgrade Required&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.426.1">4</a>, <a class="iref" href="#rfc.iref.s.37"><b>8.4.19</b></a>, <a class="iref" href="#rfc.xref.status.426.2">10.2</a>, <a class="iref" href="#rfc.xref.status.426.3">A</a></li>
     3027                        <li class="indline1">500 Internal Server Error&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.500.1">4</a>, <a class="iref" href="#rfc.iref.s.38"><b>8.5.1</b></a>, <a class="iref" href="#rfc.xref.status.500.2">10.2</a></li>
     3028                        <li class="indline1">501 Not Implemented&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.501.1">4</a>, <a class="iref" href="#rfc.iref.s.39"><b>8.5.2</b></a>, <a class="iref" href="#rfc.xref.status.501.2">10.2</a></li>
     3029                        <li class="indline1">502 Bad Gateway&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.502.1">4</a>, <a class="iref" href="#rfc.iref.s.40"><b>8.5.3</b></a>, <a class="iref" href="#rfc.xref.status.502.2">10.2</a></li>
     3030                        <li class="indline1">503 Service Unavailable&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.503.1">4</a>, <a class="iref" href="#rfc.iref.s.41"><b>8.5.4</b></a>, <a class="iref" href="#rfc.xref.status.503.2">10.2</a></li>
     3031                        <li class="indline1">504 Gateway Timeout&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.504.1">4</a>, <a class="iref" href="#rfc.iref.s.42"><b>8.5.5</b></a>, <a class="iref" href="#rfc.xref.status.504.2">10.2</a></li>
     3032                        <li class="indline1">505 HTTP Version Not Supported&nbsp;&nbsp;<a class="iref" href="#rfc.xref.status.505.1">4</a>, <a class="iref" href="#rfc.iref.s.43"><b>8.5.6</b></a>, <a class="iref" href="#rfc.xref.status.505.2">10.2</a></li>
    30063033                     </ul>
    30073034                  </li>

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

    r1070 r1071  
    612612     / "416"  ; &status-416;: Requested range not satisfiable
    613613     / "417"  ; <xref target="status.417"/>: Expectation Failed
     614     / "426"  ; <xref target="status.426"/>: Upgrade Required
    614615     / "500"  ; <xref target="status.500"/>: Internal Server Error
    615616     / "501"  ; <xref target="status.501"/>: Not Implemented
    … …  
    19521953</t>
    19531954</section>
     1955
     1956<section title="426 Upgrade Required" anchor="status.426">
     1957  <iref primary="true" item="426 Upgrade Required (status code)" x:for-anchor=""/>
     1958  <iref primary="true" item="Status Codes" subitem="426 Upgrade Required" x:for-anchor=""/>
     1959<t>
     1960   The request can not be completed without a prior protocol upgrade. This
     1961   response &MUST; include an Upgrade header field (&header-upgrade;)
     1962   specifying the required protocols.
     1963</t>
     1964<figure>
     1965<preamble>Example:</preamble>
     1966<artwork type="message/http; msgtype=&#34;request&#34;" x:indent-with="  ">
     1967HTTP/1.1 426 Upgrade Required
     1968Upgrade: HTTP/2.0
     1969Connection: Upgrade
     1970
     1971</artwork></figure>
     1972<t>
     1973   The server &SHOULD; include a message body in the 426 response which
     1974   indicates in human readable form the reason for the error and describes any
     1975   alternative courses which may be available to the user.
     1976</t>
     1977</section>
    19541978</section>
    19551979
    … …  
    26872711   <c>
    26882712      <xref target="status.417"/>
     2713   </c>
     2714   <c>426</c>
     2715   <c>Upgrade Required</c>
     2716   <c>
     2717      <xref target="status.426"/>
    26892718   </c>
    26902719   <c>500</c>
    … …  
    34483477</t>
    34493478<t>
     3479  Define status 426 (Upgrade Required) (this was incorporated from
     3480  <xref target="RFC2817"/>).
     3481  (<xref target="status.426"/>)
     3482</t>
     3483<t>
    34503484  Reclassify "Allow" as response header field, removing the option to
    34513485  specify it in a PUT request.
    … …  
    35463580 "307" / "400" / "401" / "402" / "403" / "404" / "405" / "406" /
    35473581 "407" / "408" / "409" / "410" / "411" / "412" / "413" / "414" /
    3548  "415" / "416" / "417" / "500" / "501" / "502" / "503" / "504" /
    3549  "505" / extension-code
     3582 "415" / "416" / "417" / "426" / "500" / "501" / "502" / "503" /
     3583 "504" / "505" / extension-code
    35503584
    35513585<x:ref>TE</x:ref> = &lt;TE, defined in [Part1], Section 9.5&gt;
    … …  
    40054039      "Migrate CONNECT from RFC2817 to p2"
    40064040    </t>
     4041    <t>
     4042      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/240"/>:
     4043      "Migrate Upgrade details from RFC2817"
     4044    </t>
    40074045  </list>
    40084046</t>
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