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Timestamp:
Jul 15, 2012, 10:53:36 PM (7 years ago)
Author:
julian.reschke@…
Message:

Undo the part of [1782] that removed/moved the conformance/syntax sections.

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

    r1796 r1797  
    480480      <link rel="Chapter" title="8 Content Negotiation" href="#rfc.section.8">
    481481      <link rel="Chapter" title="9 Header Field Definitions" href="#rfc.section.9">
    482       <link rel="Chapter" title="10 ABNF Rules Defined Elsewhere" href="#rfc.section.10">
    483       <link rel="Chapter" title="11 IANA Considerations" href="#rfc.section.11">
    484       <link rel="Chapter" title="12 Security Considerations" href="#rfc.section.12">
    485       <link rel="Chapter" title="13 Acknowledgments" href="#rfc.section.13">
    486       <link rel="Chapter" href="#rfc.section.14" title="14 References">
     482      <link rel="Chapter" title="10 IANA Considerations" href="#rfc.section.10">
     483      <link rel="Chapter" title="11 Security Considerations" href="#rfc.section.11">
     484      <link rel="Chapter" title="12 Acknowledgments" href="#rfc.section.12">
     485      <link rel="Chapter" href="#rfc.section.13" title="13 References">
    487486      <link rel="Appendix" title="A Differences between HTTP and MIME" href="#rfc.section.A">
    488487      <link rel="Appendix" title="B Additional Features" href="#rfc.section.B">
    … …  
    579578      <h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1>
    580579      <ul class="toc">
    581          <li>1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a></li>
     580         <li>1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a><ul>
     581               <li>1.1&nbsp;&nbsp;&nbsp;<a href="#intro.conformance.and.error.handling">Conformance and Error Handling</a></li>
     582               <li>1.2&nbsp;&nbsp;&nbsp;<a href="#notation">Syntax Notation</a><ul>
     583                     <li>1.2.1&nbsp;&nbsp;&nbsp;<a href="#core.rules">Core Rules</a></li>
     584                     <li>1.2.2&nbsp;&nbsp;&nbsp;<a href="#abnf.dependencies">ABNF Rules defined in other Parts of the Specification</a></li>
     585                  </ul>
     586               </li>
     587            </ul>
     588         </li>
    582589         <li>2.&nbsp;&nbsp;&nbsp;<a href="#methods">Methods</a><ul>
    583590               <li>2.1&nbsp;&nbsp;&nbsp;<a href="#safe.and.idempotent">Safe and Idempotent Methods</a><ul>
    … …  
    721728            </ul>
    722729         </li>
    723          <li>10.&nbsp;&nbsp;&nbsp;<a href="#abnf.dependencies">ABNF Rules Defined Elsewhere</a></li>
    724          <li>11.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
    725                <li>11.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
    726                <li>11.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
    727                <li>11.3&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
    728                <li>11.4&nbsp;&nbsp;&nbsp;<a href="#content.coding.registration">Content Coding Registry</a></li>
     730         <li>10.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
     731               <li>10.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
     732               <li>10.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
     733               <li>10.3&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
     734               <li>10.4&nbsp;&nbsp;&nbsp;<a href="#content.coding.registration">Content Coding Registry</a></li>
    729735            </ul>
    730736         </li>
    731          <li>12.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
    732                <li>12.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
    733                <li>12.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
    734                <li>12.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></li>
    735                <li>12.4&nbsp;&nbsp;&nbsp;<a href="#rfc.section.12.4">Security Considerations for CONNECT</a></li>
    736                <li>12.5&nbsp;&nbsp;&nbsp;<a href="#privacy.issues.connected.to.accept.header.fields">Privacy Issues Connected to Accept Header Fields</a></li>
     737         <li>11.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
     738               <li>11.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
     739               <li>11.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
     740               <li>11.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></li>
     741               <li>11.4&nbsp;&nbsp;&nbsp;<a href="#rfc.section.11.4">Security Considerations for CONNECT</a></li>
     742               <li>11.5&nbsp;&nbsp;&nbsp;<a href="#privacy.issues.connected.to.accept.header.fields">Privacy Issues Connected to Accept Header Fields</a></li>
    737743            </ul>
    738744         </li>
    739          <li>13.&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
    740          <li>14.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
    741                <li>14.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    742                <li>14.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     745         <li>12.&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
     746         <li>13.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
     747               <li>13.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     748               <li>13.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    743749            </ul>
    744750         </li>
    … …  
    824830         </p>
    825831      </div>
    826       <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="methods" href="#methods">Methods</a></h1>
    827       <p id="rfc.section.2.p.1">The method token indicates the request method to be performed on the target resource (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). The method is case-sensitive.
    828       </p>
    829       <div id="rfc.figure.u.1"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  <a href="#methods" class="smpl">method</a>         = <a href="#abnf.dependencies" class="smpl">token</a>
     832      <h2 id="rfc.section.1.1"><a href="#rfc.section.1.1">1.1</a>&nbsp;<a id="intro.conformance.and.error.handling" href="#intro.conformance.and.error.handling">Conformance and Error Handling</a></h2>
     833      <p id="rfc.section.1.1.p.1">The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL"
     834         in this document are to be interpreted as described in <a href="#RFC2119" id="rfc.xref.RFC2119.1"><cite title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</cite></a>.
     835      </p>
     836      <p id="rfc.section.1.1.p.2">This specification targets conformance criteria according to the role of a participant in HTTP communication. Hence, HTTP
     837         requirements are placed on senders, recipients, clients, servers, user agents, intermediaries, origin servers, proxies, gateways,
     838         or caches, depending on what behavior is being constrained by the requirement. See <a href="p1-messaging.html#architecture" title="Architecture">Section 2</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for definitions of these terms.
     839      </p>
     840      <p id="rfc.section.1.1.p.3">The verb "generate" is used instead of "send" where a requirement differentiates between creating a protocol element and merely
     841         forwarding a received element downstream.
     842      </p>
     843      <p id="rfc.section.1.1.p.4">An implementation is considered conformant if it complies with all of the requirements associated with the roles it partakes
     844         in HTTP. Note that SHOULD-level requirements are relevant here, unless one of the documented exceptions is applicable.
     845      </p>
     846      <p id="rfc.section.1.1.p.5">This document also uses ABNF to define valid protocol elements (<a href="#notation" title="Syntax Notation">Section&nbsp;1.2</a>). In addition to the prose requirements placed upon them, senders <em class="bcp14">MUST NOT</em> generate protocol elements that do not match the grammar defined by the ABNF rules for those protocol elements that are applicable
     847         to the sender's role. If a received protocol element is processed, the recipient <em class="bcp14">MUST</em> be able to parse any value that would match the ABNF rules for that protocol element, excluding only those rules not applicable
     848         to the recipient's role.
     849      </p>
     850      <p id="rfc.section.1.1.p.6">Unless noted otherwise, a recipient <em class="bcp14">MAY</em> attempt to recover a usable protocol element from an invalid construct. HTTP does not define specific error handling mechanisms
     851         except when they have a direct impact on security, since different applications of the protocol require different error handling
     852         strategies. For example, a Web browser might wish to transparently recover from a response where the <a href="#header.location" class="smpl">Location</a> header field doesn't parse according to the ABNF, whereas a systems control client might consider any form of error recovery
     853         to be dangerous.
     854      </p>
     855      <h2 id="rfc.section.1.2"><a href="#rfc.section.1.2">1.2</a>&nbsp;<a id="notation" href="#notation">Syntax Notation</a></h2>
     856      <p id="rfc.section.1.2.p.1">This specification uses the Augmented Backus-Naur Form (ABNF) notation of <a href="#RFC5234" id="rfc.xref.RFC5234.1"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a> with the list rule extension defined in <a href="p1-messaging.html#notation" title="Syntax Notation">Section 1.2</a> of <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. <a href="#collected.abnf" title="Collected ABNF">Appendix&nbsp;D</a> shows the collected ABNF with the list rule expanded.
     857      </p>
     858      <p id="rfc.section.1.2.p.2">The following core rules are included by reference, as defined in <a href="#RFC5234" id="rfc.xref.RFC5234.2"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a>, <a href="http://tools.ietf.org/html/rfc5234#appendix-B.1">Appendix B.1</a>: ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), HEXDIG
     859         (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab), LF (line feed), OCTET (any 8-bit sequence of data), SP (space), and VCHAR
     860         (any visible US-ASCII character).
     861      </p>
     862      <h3 id="rfc.section.1.2.1"><a href="#rfc.section.1.2.1">1.2.1</a>&nbsp;<a id="core.rules" href="#core.rules">Core Rules</a></h3>
     863      <p id="rfc.section.1.2.1.p.1">The core rules below are defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>:
     864      </p>
     865      <div id="rfc.figure.u.1"></div><pre class="inline">  <a href="#core.rules" class="smpl">BWS</a>           = &lt;BWS, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
     866  <a href="#core.rules" class="smpl">OWS</a>           = &lt;OWS, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
     867  <a href="#core.rules" class="smpl">RWS</a>           = &lt;RWS, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
     868  <a href="#core.rules" class="smpl">quoted-string</a> = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
     869  <a href="#core.rules" class="smpl">token</a>         = &lt;token, defined in <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
     870  <a href="#core.rules" class="smpl">word</a>          = &lt;word, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
     871</pre><h3 id="rfc.section.1.2.2"><a href="#rfc.section.1.2.2">1.2.2</a>&nbsp;<a id="abnf.dependencies" href="#abnf.dependencies">ABNF Rules defined in other Parts of the Specification</a></h3>
     872      <p id="rfc.section.1.2.2.p.1">The ABNF rules below are defined in other parts:</p>
     873      <div id="rfc.figure.u.2"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">absolute-URI</a>  = &lt;absolute-URI, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
     874  <a href="#abnf.dependencies" class="smpl">comment</a>       = &lt;comment, defined in <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
     875  <a href="#abnf.dependencies" class="smpl">partial-URI</a>   = &lt;partial-URI, defined in <a href="#Part1" id="rfc.xref.Part1.13"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
     876  <a href="#abnf.dependencies" class="smpl">qvalue</a>        = &lt;qvalue, defined in <a href="#Part1" id="rfc.xref.Part1.14"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</a>&gt;
     877  <a href="#abnf.dependencies" class="smpl">URI-reference</a> = &lt;URI-reference, defined in <a href="#Part1" id="rfc.xref.Part1.15"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
     878</pre><h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="methods" href="#methods">Methods</a></h1>
     879      <p id="rfc.section.2.p.1">The method token indicates the request method to be performed on the target resource (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.16"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). The method is case-sensitive.
     880      </p>
     881      <div id="rfc.figure.u.3"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  <a href="#methods" class="smpl">method</a>         = <a href="#core.rules" class="smpl">token</a>
    830882</pre><p id="rfc.section.2.p.3">The list of methods allowed by a resource can be specified in an <a href="#header.allow" class="smpl">Allow</a> header field (<a href="#header.allow" id="rfc.xref.header.allow.1" title="Allow">Section&nbsp;9.5</a>). The status code of the response always notifies the client whether a method is currently allowed on a resource, since the
    831883         set of allowed methods can change dynamically. An origin server <em class="bcp14">SHOULD</em> respond with the status code <a href="#status.405" class="smpl">405 (Method Not Allowed)</a> if the method is known by the origin server but not allowed for the resource, and <a href="#status.501" class="smpl">501 (Not
    … …  
    877929         to a single application, so that this is clear.
    878930      </p>
    879       <p id="rfc.section.2.2.1.p.3">Due to the parsing rules defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, definitions of HTTP methods cannot prohibit the presence of a message body on either the request or the response message
     931      <p id="rfc.section.2.2.1.p.3">Due to the parsing rules defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.17"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, definitions of HTTP methods cannot prohibit the presence of a message body on either the request or the response message
    880932         (with responses to HEAD requests being the single exception). Definitions of new methods cannot change this rule, but they
    881933         can specify that only zero-length bodies (as opposed to absent bodies) are allowed.
    … …  
    896948         body to make more detailed queries on the server.
    897949      </p>
    898       <p id="rfc.section.2.3.1.p.4">If the request-target (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is an asterisk ("*"), the OPTIONS request is intended to apply to the server in general rather than to a specific resource.
     950      <p id="rfc.section.2.3.1.p.4">If the request-target (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.18"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is an asterisk ("*"), the OPTIONS request is intended to apply to the server in general rather than to a specific resource.
    899951         Since a server's communication options typically depend on the resource, the "*" request is only useful as a "ping" or "no-op"
    900952         type of method; it does nothing beyond allowing the client to test the capabilities of the server. For example, this can be
    … …  
    928980      <p id="rfc.section.2.3.2.p.6">The response to a GET request is cacheable and <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests (see <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    929981      </p>
    930       <p id="rfc.section.2.3.2.p.7">See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;12.2</a> for security considerations when used for forms.
     982      <p id="rfc.section.2.3.2.p.7">See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section&nbsp;11.2</a> for security considerations when used for forms.
    931983      </p>
    932984      <h3 id="rfc.section.2.3.3"><a href="#rfc.section.2.3.3">2.3.3</a>&nbsp;<a id="HEAD" href="#HEAD">HEAD</a></h3>
    … …  
    10521104      </p>
    10531105      <p id="rfc.section.2.3.7.p.2">TRACE allows the client to see what is being received at the other end of the request chain and use that data for testing
    1054          or diagnostic information. The value of the <a href="p1-messaging.html#header.via" class="smpl">Via</a> header field (<a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the <a href="#header.max-forwards" class="smpl">Max-Forwards</a> header field allows the client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding
     1106         or diagnostic information. The value of the <a href="p1-messaging.html#header.via" class="smpl">Via</a> header field (<a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the <a href="#header.max-forwards" class="smpl">Max-Forwards</a> header field allows the client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding
    10551107         messages in an infinite loop.
    10561108      </p>
    1057       <p id="rfc.section.2.3.7.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> have a <a href="#header.content-type" class="smpl">Content-Type</a> of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 7.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and contain a message body that encloses a copy of the entire request message. Responses to the TRACE method are not cacheable.
     1109      <p id="rfc.section.2.3.7.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> have a <a href="#header.content-type" class="smpl">Content-Type</a> of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 7.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.20"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and contain a message body that encloses a copy of the entire request message. Responses to the TRACE method are not cacheable.
    10581110      </p>
    10591111      <div id="rfc.iref.c.2"></div>
    … …  
    10631115         its behavior to blind forwarding of packets until the connection is closed.
    10641116      </p>
    1065       <p id="rfc.section.2.3.8.p.2">When using CONNECT, the request-target <em class="bcp14">MUST</em> use the authority form (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>); i.e., the request-target consists of only the host name and port number of the tunnel destination, separated by a colon.
     1117      <p id="rfc.section.2.3.8.p.2">When using CONNECT, the request-target <em class="bcp14">MUST</em> use the authority form (<a href="p1-messaging.html#request-target" title="Request Target">Section 5.3</a> of <a href="#Part1" id="rfc.xref.Part1.21"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>); i.e., the request-target consists of only the host name and port number of the tunnel destination, separated by a colon.
    10661118         For example,
    10671119      </p>
    1068       <div id="rfc.figure.u.2"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
     1120      <div id="rfc.figure.u.4"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
    10691121Host: server.example.com:80
    10701122
    … …  
    10791131      </p>
    10801132      <p id="rfc.section.2.3.8.p.7">Proxy authentication might be used to establish the authority to create a tunnel:</p>
    1081       <div id="rfc.figure.u.3"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
     1133      <div id="rfc.figure.u.5"></div><pre class="text2">CONNECT server.example.com:80 HTTP/1.1
    10821134Host: server.example.com:80
    10831135Proxy-Authorization: basic aGVsbG86d29ybGQ=
    … …  
    11001152      <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Fields</a></h1>
    11011153      <p id="rfc.section.3.p.1">Header fields are key value pairs that can be used to communicate data about the message, its payload, the target resource,
    1102          or about the connection itself (i.e., control data). See <a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for a general definition of their syntax.
     1154         or about the connection itself (i.e., control data). See <a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.22"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for a general definition of their syntax.
    11031155      </p>
    11041156      <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="considerations.for.creating.header.fields" href="#considerations.for.creating.header.fields">Considerations for Creating Header Fields</a></h2>
    … …  
    11081160         with "X-" if they are to be registered (either immediately or in the future).
    11091161      </p>
    1110       <p id="rfc.section.3.1.p.3">New header field values typically have their syntax defined using ABNF (<a href="#RFC5234" id="rfc.xref.RFC5234.1"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a>), using the extension defined in <a href="p1-messaging.html#abnf.extension" title="ABNF list extension: #rule">Section 3.2.5</a> of <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> as necessary, and are usually constrained to the range of ASCII characters. Header fields needing a greater range of characters
     1162      <p id="rfc.section.3.1.p.3">New header field values typically have their syntax defined using ABNF (<a href="#RFC5234" id="rfc.xref.RFC5234.3"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a>), using the extension defined in <a href="p1-messaging.html#abnf.extension" title="ABNF list extension: #rule">Section 3.2.5</a> of <a href="#Part1" id="rfc.xref.Part1.23"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> as necessary, and are usually constrained to the range of ASCII characters. Header fields needing a greater range of characters
    11111163         can use an encoding such as the one defined in <a href="#RFC5987" id="rfc.xref.RFC5987.1"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>.
    11121164      </p>
    11131165      <p id="rfc.section.3.1.p.4">Because commas (",") are used as a generic delimiter between field-values, they need to be treated with care if they are allowed
    11141166         in the field-value's payload. Typically, components that might contain a comma are protected with double-quotes using the
    1115          quoted-string ABNF production (<a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a> of <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     1167         quoted-string ABNF production (<a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a> of <a href="#Part1" id="rfc.xref.Part1.24"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    11161168      </p>
    11171169      <p id="rfc.section.3.1.p.5">For example, a textual date and a URI (either of which might contain a comma) could be safely carried in field-values like
    11181170         these:
    11191171      </p>
    1120       <div id="rfc.figure.u.4"></div><pre class="text">  Example-URI-Field: "http://example.com/a.html,foo",
     1172      <div id="rfc.figure.u.6"></div><pre class="text">  Example-URI-Field: "http://example.com/a.html,foo",
    11211173                     "http://without-a-comma.example.com/"
    11221174  Example-Date-Field: "Sat, 04 May 1996", "Wed, 14 Sep 2005"
    … …  
    11311183      <ul>
    11321184         <li>
    1133             <p>Whether the field is a single value, or whether it can be a list (delimited by commas; see <a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     1185            <p>Whether the field is a single value, or whether it can be a list (delimited by commas; see <a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.25"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    11341186            </p>
    11351187            <p>If it does not use the list syntax, document how to treat messages where the header field occurs multiple times (a sensible
    … …  
    11471199         </li>
    11481200         <li>
    1149             <p>Whether it is appropriate to list the field-name in the <a href="p1-messaging.html#header.connection" class="smpl">Connection</a> header field (i.e., if the header field is to be hop-by-hop, see <a href="p1-messaging.html#header.connection" title="Connection">Section 6.1</a> of <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     1201            <p>Whether it is appropriate to list the field-name in the <a href="p1-messaging.html#header.connection" class="smpl">Connection</a> header field (i.e., if the header field is to be hop-by-hop, see <a href="p1-messaging.html#header.connection" title="Connection">Section 6.1</a> of <a href="#Part1" id="rfc.xref.Part1.26"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    11501202            </p>
    11511203         </li>
    … …  
    11581210         </li>
    11591211         <li>
    1160             <p>Whether the header field is useful or allowable in trailers (see <a href="p1-messaging.html#chunked.encoding" title="Chunked Transfer Coding">Section 4.1</a> of <a href="#Part1" id="rfc.xref.Part1.13"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     1212            <p>Whether the header field is useful or allowable in trailers (see <a href="p1-messaging.html#chunked.encoding" title="Chunked Transfer Coding">Section 4.1</a> of <a href="#Part1" id="rfc.xref.Part1.27"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    11611213            </p>
    11621214         </li>
    … …  
    12091261               <tr>
    12101262                  <td class="left">Host</td>
    1211                   <td class="left"><a href="p1-messaging.html#header.host" title="Host">Section 5.4</a> of <a href="#Part1" id="rfc.xref.Part1.14"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
     1263                  <td class="left"><a href="p1-messaging.html#header.host" title="Host">Section 5.4</a> of <a href="#Part1" id="rfc.xref.Part1.28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
    12121264               </tr>
    12131265               <tr>
    … …  
    12491301               <tr>
    12501302                  <td class="left">TE</td>
    1251                   <td class="left"><a href="p1-messaging.html#header.te" title="TE">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.15"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
     1303                  <td class="left"><a href="p1-messaging.html#header.te" title="TE">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
    12521304               </tr>
    12531305               <tr>
    … …  
    12601312      <h2 id="rfc.section.3.3"><a href="#rfc.section.3.3">3.3</a>&nbsp;<a id="response.header.fields" href="#response.header.fields">Response Header Fields</a></h2>
    12611313      <p id="rfc.section.3.3.p.1">The response header fields allow the server to pass additional information about the response which cannot be placed in the
    1262          status-line. These header fields give information about the server and about further access to the target resource (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.16"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     1314         status-line. These header fields give information about the server and about further access to the target resource (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</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>).
    12631315      </p>
    12641316      <div id="rfc.table.u.2">
    … …  
    16081660      <p id="rfc.section.4.3.1.p.1">The client <em class="bcp14">SHOULD</em> continue with its request. This interim response is used to inform the client that the initial part of the request has been
    16091661         received and has not yet been rejected by the server. The client <em class="bcp14">SHOULD</em> continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The
    1610          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.Part1.17"><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.
     1662         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.Part1.31"><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.
    16111663      </p>
    16121664      <div id="rfc.iref.22"></div>
    16131665      <div id="rfc.iref.s.4"></div>
    16141666      <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>
    1615       <p id="rfc.section.4.3.2.p.1">The server understands and is willing to comply with the client's request, via the <a href="p1-messaging.html#header.upgrade" class="smpl">Upgrade</a> message header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.18"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>), for a change in the application protocol being used on this connection. The server will switch protocols to those defined
     1667      <p id="rfc.section.4.3.2.p.1">The server understands and is willing to comply with the client's request, via the <a href="p1-messaging.html#header.upgrade" class="smpl">Upgrade</a> message header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</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 a change in the application protocol being used on this connection. The server will switch protocols to those defined
    16161668         by the response's Upgrade header field immediately after the empty line which terminates the 101 response.
    16171669      </p>
    … …  
    16681720      <div id="rfc.iref.s.9"></div>
    16691721      <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>
    1670       <p id="rfc.section.4.4.4.p.1">The representation in the response has been transformed or otherwise modified by a transforming proxy (<a href="p1-messaging.html#intermediaries" title="Intermediaries">Section 2.4</a> of <a href="#Part1" id="rfc.xref.Part1.19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Note that the behavior of transforming intermediaries is controlled by the no-transform Cache-Control directive (<a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 7.2</a> of <a href="#Part6" id="rfc.xref.Part6.12"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     1722      <p id="rfc.section.4.4.4.p.1">The representation in the response has been transformed or otherwise modified by a transforming proxy (<a href="p1-messaging.html#intermediaries" title="Intermediaries">Section 2.4</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>). Note that the behavior of transforming intermediaries is controlled by the no-transform Cache-Control directive (<a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 7.2</a> of <a href="#Part6" id="rfc.xref.Part6.12"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    16711723      </p>
    16721724      <p id="rfc.section.4.4.4.p.2">This status code is only appropriate when the response status code would have been <a href="#status.200" class="smpl">200 (OK)</a> otherwise. When the status code before transformation would have been different, the 214 Transformation Applied warn-code
    … …  
    17031755         another input action.
    17041756      </p>
    1705       <p id="rfc.section.4.4.6.p.2">The message body included with the response <em class="bcp14">MUST</em> be empty. Note that receivers still need to parse the response according to the algorithm defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.20"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     1757      <p id="rfc.section.4.4.6.p.2">The message body included with the response <em class="bcp14">MUST</em> be empty. Note that receivers still need to parse the response according to the algorithm defined in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.34"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
    17061758      </p>
    17071759      <h2 id="rfc.section.4.5"><a href="#rfc.section.4.5">4.5</a>&nbsp;<a id="status.3xx" href="#status.3xx">Redirection 3xx</a></h2>
    … …  
    19622014      <div id="rfc.iref.s.35"></div>
    19632015      <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>
    1964       <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 <a href="p1-messaging.html#header.upgrade" class="smpl">Upgrade</a> header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</a> of <a href="#Part1" id="rfc.xref.Part1.21"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) specifying the required protocols.
    1965       </p>
    1966       <div id="rfc.figure.u.5"></div>
     2016      <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 <a href="p1-messaging.html#header.upgrade" class="smpl">Upgrade</a> header field (<a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 6.5</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>) specifying the required protocols.
     2017      </p>
     2018      <div id="rfc.figure.u.7"></div>
    19672019      <p>Example:</p>  <pre class="text">HTTP/1.1 426 Upgrade Required
    19682020Upgrade: HTTP/3.0
    … …  
    20272079      <p id="rfc.section.4.7.6.p.1">The server does not support, or refuses to support, the protocol version that was used in the request message. The server
    20282080         is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described
    2029          in <a href="p1-messaging.html#http.version" title="Protocol Versioning">Section 2.7</a> of <a href="#Part1" id="rfc.xref.Part1.22"><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.
     2081         in <a href="p1-messaging.html#http.version" title="Protocol Versioning">Section 2.7</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>, 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.
    20302082      </p>
    20312083      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
    … …  
    20342086         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>:
    20352087      </p>
    2036       <div id="rfc.figure.u.6"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
     2088      <div id="rfc.figure.u.8"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
    20372089</pre><p id="rfc.section.5.1.p.3">The other formats are described here only for compatibility with obsolete implementations.</p>
    2038       <div id="rfc.figure.u.7"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
     2090      <div id="rfc.figure.u.9"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
    20392091Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
    20402092</pre><p id="rfc.section.5.1.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.
    … …  
    20442096         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.
    20452097      </p>
    2046       <div id="rfc.figure.u.8"></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>
     2098      <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>
    20472099</pre><div id="preferred.date.format">
    20482100         <p id="rfc.section.5.1.p.8">                    Preferred format:</p>
    20492101      </div>
    2050       <div id="rfc.figure.u.9"></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="#abnf.dependencies" class="smpl">SP</a> date1 <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
     2102      <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>
    20512103  ; fixed length subset of the format defined in
    20522104  ; <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>
    … …  
    20602112               / %x53.75.6E ; "Sun", case-sensitive
    20612113               
    2062   <a href="#obsolete.date.formats" class="smpl">date1</a>        = <a href="#preferred.date.format" class="smpl">day</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">month</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">year</a>
     2114  <a href="#obsolete.date.formats" class="smpl">date1</a>        = <a href="#preferred.date.format" class="smpl">day</a> <a href="#notation" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">month</a> <a href="#notation" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">year</a>
    20632115               ; e.g., 02 Jun 1982
    20642116
    2065   <a href="#preferred.date.format" class="smpl">day</a>          = 2<a href="#abnf.dependencies" class="smpl">DIGIT</a>
     2117  <a href="#preferred.date.format" class="smpl">day</a>          = 2<a href="#notation" class="smpl">DIGIT</a>
    20662118  <a href="#preferred.date.format" class="smpl">month</a>        = %x4A.61.6E ; "Jan", case-sensitive
    20672119               / %x46.65.62 ; "Feb", case-sensitive
    … …  
    20762128               / %x4E.6F.76 ; "Nov", case-sensitive
    20772129               / %x44.65.63 ; "Dec", case-sensitive
    2078   <a href="#preferred.date.format" class="smpl">year</a>         = 4<a href="#abnf.dependencies" class="smpl">DIGIT</a>
     2130  <a href="#preferred.date.format" class="smpl">year</a>         = 4<a href="#notation" class="smpl">DIGIT</a>
    20792131
    20802132  <a href="#preferred.date.format" class="smpl">GMT</a>   = %x47.4D.54 ; "GMT", case-sensitive
    … …  
    20832135                 ; 00:00:00 - 23:59:59
    20842136                 
    2085   <a href="#preferred.date.format" class="smpl">hour</a>         = 2<a href="#abnf.dependencies" class="smpl">DIGIT</a>               
    2086   <a href="#preferred.date.format" class="smpl">minute</a>       = 2<a href="#abnf.dependencies" class="smpl">DIGIT</a>               
    2087   <a href="#preferred.date.format" class="smpl">second</a>       = 2<a href="#abnf.dependencies" class="smpl">DIGIT</a>               
     2137  <a href="#preferred.date.format" class="smpl">hour</a>         = 2<a href="#notation" class="smpl">DIGIT</a>               
     2138  <a href="#preferred.date.format" class="smpl">minute</a>       = 2<a href="#notation" class="smpl">DIGIT</a>               
     2139  <a href="#preferred.date.format" class="smpl">second</a>       = 2<a href="#notation" class="smpl">DIGIT</a>               
    20882140</pre><p id="rfc.section.5.1.p.10">The semantics of <a href="#preferred.date.format" class="smpl">day-name</a>, <a href="#preferred.date.format" class="smpl">day</a>, <a href="#preferred.date.format" class="smpl">month</a>, <a href="#preferred.date.format" class="smpl">year</a>, and <a href="#preferred.date.format" class="smpl">time-of-day</a> are the same as those defined for the RFC 5322 constructs with the corresponding name (<a href="#RFC5322" id="rfc.xref.RFC5322.1"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.3">Section 3.3</a>).
    20892141      </p>
    … …  
    20912143         <p id="rfc.section.5.1.p.11">              Obsolete formats:</p>
    20922144      </div>
    2093       <div id="rfc.figure.u.10"></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>
    2094 </pre><div id="rfc.figure.u.11"></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="#abnf.dependencies" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date2</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
    2095   <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="#abnf.dependencies" class="smpl">DIGIT</a>
     2145      <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>
     2146</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>
     2147  <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>
    20962148                 ; day-month-year (e.g., 02-Jun-82)
    20972149
    … …  
    21032155         / %x53.61.74.75.72.64.61.79 ; "Saturday", case-sensitive
    21042156         / %x53.75.6E.64.61.79 ; "Sunday", case-sensitive
    2105 </pre><div id="rfc.figure.u.12"></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="#abnf.dependencies" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date3</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#abnf.dependencies" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">year</a>
    2106   <a href="#obsolete.date.formats" class="smpl">date3</a>        = <a href="#preferred.date.format" class="smpl">month</a> <a href="#abnf.dependencies" class="smpl">SP</a> ( 2<a href="#abnf.dependencies" class="smpl">DIGIT</a> / ( <a href="#abnf.dependencies" class="smpl">SP</a> 1<a href="#abnf.dependencies" class="smpl">DIGIT</a> ))
     2157</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>
     2158  <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> ))
    21072159                 ; month day (e.g., Jun  2)
    21082160</pre><div class="note" id="rfc.section.5.1.p.15">
    … …  
    21212173         By convention, the products are listed in order of their significance for identifying the application.
    21222174      </p>
    2123       <div id="rfc.figure.u.13"></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="#abnf.dependencies" class="smpl">token</a> ["/" <a href="#product.tokens" class="smpl">product-version</a>]
    2124   <a href="#product.tokens" class="smpl">product-version</a> = <a href="#abnf.dependencies" class="smpl">token</a>
     2175      <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>]
     2176  <a href="#product.tokens" class="smpl">product-version</a> = <a href="#core.rules" class="smpl">token</a>
    21252177</pre><p id="rfc.section.5.2.p.3">Examples:</p>
    2126       <div id="rfc.figure.u.14"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     2178      <div id="rfc.figure.u.16"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    21272179  Server: Apache/0.8.4
    21282180</pre><p id="rfc.section.5.2.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).
    … …  
    21352187         </p>
    21362188      </div>
    2137       <div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  <a href="#rule.charset" class="smpl">charset</a> = <a href="#abnf.dependencies" class="smpl">token</a>
     2189      <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  <a href="#rule.charset" class="smpl">charset</a> = <a href="#core.rules" class="smpl">token</a>
    21382190</pre><p id="rfc.section.5.3.p.4">Although HTTP allows an arbitrary token to be used as a charset value, any token that has a predefined value within the IANA
    21392191         Character Set registry <em class="bcp14">MUST</em> represent the character encoding defined by that registry. Applications <em class="bcp14">SHOULD</em> limit their use of character encodings to those defined within the IANA registry.
    … …  
    21492201         directly, and only decoded by the recipient.
    21502202      </p>
    2151       <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.22"></span>  <a href="#content.codings" class="smpl">content-coding</a>   = <a href="#abnf.dependencies" class="smpl">token</a>
     2203      <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.22"></span>  <a href="#content.codings" class="smpl">content-coding</a>   = <a href="#core.rules" class="smpl">token</a>
    21522204</pre><p id="rfc.section.5.4.p.3">All content-coding values are case-insensitive. HTTP/1.1 uses content-coding values in the <a href="#header.accept-encoding" class="smpl">Accept-Encoding</a> (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.2" title="Accept-Encoding">Section&nbsp;9.3</a>) and <a href="#header.content-encoding" class="smpl">Content-Encoding</a> (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.1" title="Content-Encoding">Section&nbsp;9.6</a>) header fields. Although the value describes the content-coding, what is more important is that it indicates what decoding
    21532205         mechanism will be required to remove the encoding.
    … …  
    21562208      </p>
    21572209      <ul class="empty">
    2158          <li>See <a href="p1-messaging.html#compress.coding" title="Compress Coding">Section 4.2.1</a> of <a href="#Part1" id="rfc.xref.Part1.23"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     2210         <li>See <a href="p1-messaging.html#compress.coding" title="Compress Coding">Section 4.2.1</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>.
    21592211         </li>
    21602212      </ul>
    … …  
    21622214      </p>
    21632215      <ul class="empty">
    2164          <li>See <a href="p1-messaging.html#deflate.coding" title="Deflate Coding">Section 4.2.2</a> of <a href="#Part1" id="rfc.xref.Part1.24"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     2216         <li>See <a href="p1-messaging.html#deflate.coding" title="Deflate Coding">Section 4.2.2</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>.
    21652217         </li>
    21662218      </ul>
    … …  
    21682220      </p>
    21692221      <ul class="empty">
    2170          <li>See <a href="p1-messaging.html#gzip.coding" title="Gzip Coding">Section 4.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.25"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     2222         <li>See <a href="p1-messaging.html#gzip.coding" title="Gzip Coding">Section 4.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.39"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
    21712223         </li>
    21722224      </ul>
    … …  
    21802232         <li>Pointer to specification text</li>
    21812233      </ul>
    2182       <p id="rfc.section.5.4.1.p.3">Names of content codings <em class="bcp14">MUST NOT</em> overlap with names of transfer codings (<a href="p1-messaging.html#transfer.codings" title="Transfer Codings">Section 4</a> of <a href="#Part1" id="rfc.xref.Part1.26"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>), unless the encoding transformation is identical (as is the case for the compression codings defined in <a href="p1-messaging.html#compression.codings" title="Compression Codings">Section 4.2</a> of <a href="#Part1" id="rfc.xref.Part1.27"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     2234      <p id="rfc.section.5.4.1.p.3">Names of content codings <em class="bcp14">MUST NOT</em> overlap with names of transfer codings (<a href="p1-messaging.html#transfer.codings" title="Transfer Codings">Section 4</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>), unless the encoding transformation is identical (as is the case for the compression codings defined in <a href="p1-messaging.html#compression.codings" title="Compression Codings">Section 4.2</a> of <a href="#Part1" id="rfc.xref.Part1.41"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    21832235      </p>
    21842236      <p id="rfc.section.5.4.1.p.4">Values to be added to this name space require IETF Review (see <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a> of <a href="#RFC5226" id="rfc.xref.RFC5226.3"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>), and <em class="bcp14">MUST</em> conform to the purpose of content coding defined in this section.
    … …  
    21892241      <p id="rfc.section.5.5.p.1">HTTP uses Internet Media Types <a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> in the <a href="#header.content-type" class="smpl">Content-Type</a> (<a href="#header.content-type" id="rfc.xref.header.content-type.3" title="Content-Type">Section&nbsp;9.9</a>) and <a href="#header.accept" class="smpl">Accept</a> (<a href="#header.accept" id="rfc.xref.header.accept.2" title="Accept">Section&nbsp;9.1</a>) header fields in order to provide open and extensible data typing and type negotiation.
    21902242      </p>
    2191       <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span><span id="rfc.iref.g.26"></span>  <a href="#media.types" class="smpl">media-type</a> = <a href="#media.types" class="smpl">type</a> "/" <a href="#media.types" class="smpl">subtype</a> *( <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> <a href="#rule.parameter" class="smpl">parameter</a> )
    2192   <a href="#media.types" class="smpl">type</a>       = <a href="#abnf.dependencies" class="smpl">token</a>
    2193   <a href="#media.types" class="smpl">subtype</a>    = <a href="#abnf.dependencies" class="smpl">token</a>
     2243      <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span><span id="rfc.iref.g.26"></span>  <a href="#media.types" class="smpl">media-type</a> = <a href="#media.types" class="smpl">type</a> "/" <a href="#media.types" class="smpl">subtype</a> *( <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> <a href="#rule.parameter" class="smpl">parameter</a> )
     2244  <a href="#media.types" class="smpl">type</a>       = <a href="#core.rules" class="smpl">token</a>
     2245  <a href="#media.types" class="smpl">subtype</a>    = <a href="#core.rules" class="smpl">token</a>
    21942246</pre><div id="rule.parameter">
    21952247         <p id="rfc.section.5.5.p.3">      The type/subtype <em class="bcp14">MAY</em> be followed by parameters in the form of attribute/value pairs.
    21962248         </p>
    21972249      </div>
    2198       <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span><span id="rfc.iref.g.29"></span>  <a href="#rule.parameter" class="smpl">parameter</a>      = <a href="#rule.parameter" class="smpl">attribute</a> "=" <a href="#rule.parameter" class="smpl">value</a>
    2199   <a href="#rule.parameter" class="smpl">attribute</a>      = <a href="#abnf.dependencies" class="smpl">token</a>
    2200   <a href="#rule.parameter" class="smpl">value</a>          = <a href="#abnf.dependencies" class="smpl">word</a>
     2250      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span><span id="rfc.iref.g.29"></span>  <a href="#rule.parameter" class="smpl">parameter</a>      = <a href="#rule.parameter" class="smpl">attribute</a> "=" <a href="#rule.parameter" class="smpl">value</a>
     2251  <a href="#rule.parameter" class="smpl">attribute</a>      = <a href="#core.rules" class="smpl">token</a>
     2252  <a href="#rule.parameter" class="smpl">value</a>          = <a href="#core.rules" class="smpl">word</a>
    22012253</pre><p id="rfc.section.5.5.p.5">The type, subtype, and parameter attribute names are case-insensitive. Parameter values might or might not be case-sensitive,
    22022254         depending on the semantics of the parameter name. The presence or absence of a parameter might be significant to the processing
    22032255         of a media-type, depending on its definition within the media type registry.
    22042256      </p>
    2205       <p id="rfc.section.5.5.p.6">A parameter value that matches the <a href="#abnf.dependencies" class="smpl">token</a> production can be transmitted as either a token or within a quoted-string. The quoted and unquoted values are equivalent.
     2257      <p id="rfc.section.5.5.p.6">A parameter value that matches the <a href="#core.rules" class="smpl">token</a> production can be transmitted as either a token or within a quoted-string. The quoted and unquoted values are equivalent.
    22062258      </p>
    22072259      <p id="rfc.section.5.5.p.7">Note that some older HTTP applications do not recognize media type parameters. When sending data to older HTTP applications,
    … …  
    22462298         of subtags:
    22472299      </p>
    2248       <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.30"></span>  <a href="#language.tags" class="smpl">language-tag</a> = &lt;Language-Tag, defined in <a href="#RFC5646" id="rfc.xref.RFC5646.2"><cite title="Tags for Identifying Languages">[RFC5646]</cite></a>, <a href="http://tools.ietf.org/html/rfc5646#section-2.1">Section 2.1</a>&gt;
     2300      <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.30"></span>  <a href="#language.tags" class="smpl">language-tag</a> = &lt;Language-Tag, defined in <a href="#RFC5646" id="rfc.xref.RFC5646.2"><cite title="Tags for Identifying Languages">[RFC5646]</cite></a>, <a href="http://tools.ietf.org/html/rfc5646#section-2.1">Section 2.1</a>&gt;
    22492301</pre><p id="rfc.section.5.6.p.4">White space is not allowed within the tag and all tags are case-insensitive. The name space of language subtags is administered
    22502302         by the IANA (see &lt;<a href="http://www.iana.org/assignments/language-subtag-registry">http://www.iana.org/assignments/language-subtag-registry</a>&gt;).
    22512303      </p>
    2252       <div id="rfc.figure.u.20"></div>
     2304      <div id="rfc.figure.u.22"></div>
    22532305      <p>Example tags include:</p>  <pre class="text">  en, en-US, es-419, az-Arab, x-pig-latin, man-Nkoo-GN
    22542306</pre> <p id="rfc.section.5.6.p.6">See <a href="#RFC5646" id="rfc.xref.RFC5646.3"><cite title="Tags for Identifying Languages">[RFC5646]</cite></a> for further information.
    … …  
    22792331               <tr>
    22802332                  <td class="left">Content-Length</td>
    2281                   <td class="left"><a href="p1-messaging.html#header.content-length" title="Content-Length">Section 3.3.2</a> of <a href="#Part1" id="rfc.xref.Part1.28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
     2333                  <td class="left"><a href="p1-messaging.html#header.content-length" title="Content-Length">Section 3.3.2</a> of <a href="#Part1" id="rfc.xref.Part1.42"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a></td>
    22822334               </tr>
    22832335               <tr>
    … …  
    22892341      </div>
    22902342      <h2 id="rfc.section.6.2"><a href="#rfc.section.6.2">6.2</a>&nbsp;<a id="payload.body" href="#payload.body">Payload Body</a></h2>
    2291       <p id="rfc.section.6.2.p.1">A payload body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The payload body is obtained from the message body by decoding any <a href="p1-messaging.html#header.transfer-encoding" class="smpl">Transfer-Encoding</a> that might have been applied to ensure safe and proper transfer of the message.
     2343      <p id="rfc.section.6.2.p.1">A payload body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.43"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The payload body is obtained from the message body by decoding any <a href="p1-messaging.html#header.transfer-encoding" class="smpl">Transfer-Encoding</a> that might have been applied to ensure safe and proper transfer of the message.
    22922344      </p>
    22932345      <div id="rfc.iref.r.1"></div>
    … …  
    23082360         in an HTTP message, it is referred to as the payload of the message.
    23092361      </p>
    2310       <p id="rfc.section.7.p.4">A representation body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.30"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The representation body is obtained from the message body by decoding any <a href="p1-messaging.html#header.transfer-encoding" class="smpl">Transfer-Encoding</a> that might have been applied to ensure safe and proper transfer of the message.
     2362      <p id="rfc.section.7.p.4">A representation body is only present in a message when a message body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 3.3</a> of <a href="#Part1" id="rfc.xref.Part1.44"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The representation body is obtained from the message body by decoding any <a href="p1-messaging.html#header.transfer-encoding" class="smpl">Transfer-Encoding</a> that might have been applied to ensure safe and proper transfer of the message.
    23112363      </p>
    23122364      <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="identifying.response.associated.with.representation" href="#identifying.response.associated.with.representation">Identifying the Resource Associated with a Representation</a></h2>
    23132365      <p id="rfc.section.7.1.p.1">It is sometimes necessary to determine an identifier for the resource associated with a representation.</p>
    23142366      <p id="rfc.section.7.1.p.2">An HTTP request representation, when present, is always associated with an anonymous (i.e., unidentified) resource.</p>
    2315       <p id="rfc.section.7.1.p.3">In the common case, an HTTP response is a representation of the target resource (see <a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.31"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). However, this is not always the case. To determine the URI of the resource a response is associated with, the following
     2367      <p id="rfc.section.7.1.p.3">In the common case, an HTTP response is a representation of the target resource (see <a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.45"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). However, this is not always the case. To determine the URI of the resource a response is associated with, the following
    23162368         rules are used (with the first applicable one being selected):
    23172369      </p>
    … …  
    24052457      <p id="rfc.section.7.3.p.2">The data type of the representation data is determined via the header fields <a href="#header.content-type" class="smpl">Content-Type</a> and <a href="#header.content-encoding" class="smpl">Content-Encoding</a>. These define a two-layer, ordered encoding model:
    24062458      </p>
    2407       <div id="rfc.figure.u.21"></div><pre class="text">  representation-data := Content-Encoding( Content-Type( bits ) )
     2459      <div id="rfc.figure.u.23"></div><pre class="text">  representation-data := Content-Encoding( Content-Type( bits ) )
    24082460</pre><p id="rfc.section.7.3.p.4"> <a href="#header.content-type" class="smpl">Content-Type</a> specifies the media type of the underlying data, which defines both the data format and how that data <em class="bcp14">SHOULD</em> be processed by the recipient (within the scope of the request method semantics). Any HTTP/1.1 message containing a payload
    24092461         body <em class="bcp14">SHOULD</em> include a Content-Type header field defining the media type of the associated representation unless that metadata is unknown
    … …  
    24742526            (Not Acceptable)</a> response.
    24752527      </p>
    2476       <p id="rfc.section.8.1.p.5">Many of the mechanisms for expressing preferences use quality values to declare relative preference. See <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</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 more information.
     2528      <p id="rfc.section.8.1.p.5">Many of the mechanisms for expressing preferences use quality values to declare relative preference. See <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.46"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for more information.
    24772529      </p>
    24782530      <p id="rfc.section.8.1.p.6">HTTP/1.1 includes the following header fields for enabling server-driven negotiation through description of user agent capabilities
    … …  
    25162568         for an in-line image.
    25172569      </p>
    2518       <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.31"></span><span id="rfc.iref.g.32"></span><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span>  <a href="#header.accept" class="smpl">Accept</a> = #( <a href="#header.accept" class="smpl">media-range</a> [ <a href="#header.accept" class="smpl">accept-params</a> ] )
     2570      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.31"></span><span id="rfc.iref.g.32"></span><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span>  <a href="#header.accept" class="smpl">Accept</a> = #( <a href="#header.accept" class="smpl">media-range</a> [ <a href="#header.accept" class="smpl">accept-params</a> ] )
    25192571 
    25202572  <a href="#header.accept" class="smpl">media-range</a>    = ( "*/*"
    25212573                   / ( <a href="#media.types" class="smpl">type</a> "/" "*" )
    25222574                   / ( <a href="#media.types" class="smpl">type</a> "/" <a href="#media.types" class="smpl">subtype</a> )
    2523                    ) *( <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> <a href="#rule.parameter" class="smpl">parameter</a> )
    2524   <a href="#header.accept" class="smpl">accept-params</a>  = <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> *( <a href="#header.accept" class="smpl">accept-ext</a> )
    2525   <a href="#header.accept" class="smpl">accept-ext</a>     = <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> <a href="#abnf.dependencies" class="smpl">token</a> [ "=" <a href="#abnf.dependencies" class="smpl">word</a> ]
     2575                   ) *( <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> <a href="#rule.parameter" class="smpl">parameter</a> )
     2576  <a href="#header.accept" class="smpl">accept-params</a>  = <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> *( <a href="#header.accept" class="smpl">accept-ext</a> )
     2577  <a href="#header.accept" class="smpl">accept-ext</a>     = <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> <a href="#core.rules" class="smpl">token</a> [ "=" <a href="#core.rules" class="smpl">word</a> ]
    25262578</pre><p id="rfc.section.9.1.p.3">The asterisk "*" character is used to group media types into ranges, with "*/*" indicating all media types and "type/*" indicating
    25272579         all subtypes of that type. The media-range <em class="bcp14">MAY</em> include media type parameters that are applicable to that range.
    … …  
    25292581      <p id="rfc.section.9.1.p.4">Each media-range <em class="bcp14">MAY</em> be followed by one or more accept-params, beginning with the "q" parameter for indicating a relative quality factor. The first
    25302582         "q" parameter (if any) separates the media-range parameter(s) from the accept-params. Quality factors allow the user or user
    2531          agent to indicate the relative degree of preference for that media-range, using the qvalue scale from 0 to 1 (<a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</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>). The default value is q=1.
     2583         agent to indicate the relative degree of preference for that media-range, using the qvalue scale from 0 to 1 (<a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.47"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). The default value is q=1.
    25322584      </p>
    25332585      <div class="note" id="rfc.section.9.1.p.5">
    … …  
    25392591      </div>
    25402592      <p id="rfc.section.9.1.p.6">The example</p>
    2541       <div id="rfc.figure.u.23"></div><pre class="text">  Accept: audio/*; q=0.2, audio/basic
     2593      <div id="rfc.figure.u.25"></div><pre class="text">  Accept: audio/*; q=0.2, audio/basic
    25422594</pre><p id="rfc.section.9.1.p.8"> <em class="bcp14">SHOULD</em> be interpreted as "I prefer audio/basic, but send me any audio type if it is the best available after an 80% mark-down in
    25432595         quality".
    … …  
    25482600      </p>
    25492601      <p id="rfc.section.9.1.p.10">A more elaborate example is</p>
    2550       <div id="rfc.figure.u.24"></div><pre class="text">  Accept: text/plain; q=0.5, text/html,
     2602      <div id="rfc.figure.u.26"></div><pre class="text">  Accept: text/plain; q=0.5, text/html,
    25512603          text/x-dvi; q=0.8, text/x-c
    25522604</pre><p id="rfc.section.9.1.p.12">Verbally, this would be interpreted as "text/html and text/x-c are the preferred media types, but if they do not exist, then
    … …  
    25562608         to a given type, the most specific reference has precedence. For example,
    25572609      </p>
    2558       <div id="rfc.figure.u.25"></div><pre class="text">  Accept: text/*, text/plain, text/plain;format=flowed, */*
     2610      <div id="rfc.figure.u.27"></div><pre class="text">  Accept: text/*, text/plain, text/plain;format=flowed, */*
    25592611</pre><p id="rfc.section.9.1.p.15">have the following precedence: </p>
    25602612      <ol>
    … …  
    25672619         which matches that type. For example,
    25682620      </p>
    2569       <div id="rfc.figure.u.26"></div><pre class="text">  Accept: text/*;q=0.3, text/html;q=0.7, text/html;level=1,
     2621      <div id="rfc.figure.u.28"></div><pre class="text">  Accept: text/*;q=0.3, text/html;q=0.7, text/html;level=1,
    25702622          text/html;level=2;q=0.4, */*;q=0.5
    25712623</pre><p id="rfc.section.9.1.p.18">would cause the following values to be associated:</p>
    … …  
    26162668         that capability to a server which is capable of representing documents in those character encodings.
    26172669      </p>
    2618       <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.35"></span>  <a href="#header.accept-charset" class="smpl">Accept-Charset</a> = 1#( ( <a href="#rule.charset" class="smpl">charset</a> / "*" )
    2619                          [ <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
     2670      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.35"></span>  <a href="#header.accept-charset" class="smpl">Accept-Charset</a> = 1#( ( <a href="#rule.charset" class="smpl">charset</a> / "*" )
     2671                         [ <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
    26202672</pre><p id="rfc.section.9.2.p.3">Character encoding values (a.k.a., charsets) are described in <a href="#character.sets" title="Character Encodings (charset)">Section&nbsp;5.3</a>. Each charset <em class="bcp14">MAY</em> be given an associated quality value which represents the user's preference for that charset. The default value is q=1. An
    26212673         example is
    26222674      </p>
    2623       <div id="rfc.figure.u.28"></div><pre class="text">  Accept-Charset: iso-8859-5, unicode-1-1;q=0.8
     2675      <div id="rfc.figure.u.30"></div><pre class="text">  Accept-Charset: iso-8859-5, unicode-1-1;q=0.8
    26242676</pre><p id="rfc.section.9.2.p.5">The special value "*", if present in the Accept-Charset field, matches every character encoding which is not mentioned elsewhere
    26252677         in the Accept-Charset field. If no "*" is present in an Accept-Charset field, then all character encodings not explicitly
    … …  
    26362688         no encoding is preferred.
    26372689      </p>
    2638       <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span>  <a href="#header.accept-encoding" class="smpl">Accept-Encoding</a>  = #( <a href="#header.accept-encoding" class="smpl">codings</a> [ <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
     2690      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span>  <a href="#header.accept-encoding" class="smpl">Accept-Encoding</a>  = #( <a href="#header.accept-encoding" class="smpl">codings</a> [ <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
    26392691  <a href="#header.accept-encoding" class="smpl">codings</a>          = <a href="#content.codings" class="smpl">content-coding</a> / "identity" / "*"
    26402692</pre><p id="rfc.section.9.3.p.3">Each codings value <em class="bcp14">MAY</em> be given an associated quality value which represents the preference for that encoding. The default value is q=1.
    26412693      </p>
    26422694      <p id="rfc.section.9.3.p.4">For example,</p>
    2643       <div id="rfc.figure.u.30"></div><pre class="text">  Accept-Encoding: compress, gzip
     2695      <div id="rfc.figure.u.32"></div><pre class="text">  Accept-Encoding: compress, gzip
    26442696  Accept-Encoding:
    26452697  Accept-Encoding: *
    … …  
    26572709         </li>
    26582710         <li>If the representation's content-coding is one of the content-codings listed in the Accept-Encoding field, then it is acceptable
    2659             unless it is accompanied by a qvalue of 0. (As defined in <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</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>, a qvalue of 0 means "not acceptable".)
     2711            unless it is accompanied by a qvalue of 0. (As defined in <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.48"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, a qvalue of 0 means "not acceptable".)
    26602712         </li>
    26612713         <li>If multiple content-codings are acceptable, then the acceptable content-coding with the highest non-zero qvalue is preferred.</li>
    … …  
    26792731         in the response. Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;5.6</a>.
    26802732      </p>
    2681       <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.38"></span><span id="rfc.iref.g.39"></span>  <a href="#header.accept-language" class="smpl">Accept-Language</a> =
    2682                     1#( <a href="#header.accept-language" class="smpl">language-range</a> [ <a href="#abnf.dependencies" class="smpl">OWS</a> ";" <a href="#abnf.dependencies" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
     2733      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.38"></span><span id="rfc.iref.g.39"></span>  <a href="#header.accept-language" class="smpl">Accept-Language</a> =
     2734                    1#( <a href="#header.accept-language" class="smpl">language-range</a> [ <a href="#core.rules" class="smpl">OWS</a> ";" <a href="#core.rules" class="smpl">OWS</a> "q=" <a href="#abnf.dependencies" class="smpl">qvalue</a> ] )
    26832735  <a href="#header.accept-language" class="smpl">language-range</a>  =
    26842736            &lt;language-range, defined in <a href="#RFC4647" id="rfc.xref.RFC4647.1"><cite title="Matching of Language Tags">[RFC4647]</cite></a>, <a href="http://tools.ietf.org/html/rfc4647#section-2.1">Section 2.1</a>&gt;
    … …  
    26862738         languages specified by that range. The quality value defaults to "q=1". For example,
    26872739      </p>
    2688       <div id="rfc.figure.u.32"></div><pre class="text">  Accept-Language: da, en-gb;q=0.8, en;q=0.7
     2740      <div id="rfc.figure.u.34"></div><pre class="text">  Accept-Language: da, en-gb;q=0.8, en;q=0.7
    26892741</pre><p id="rfc.section.9.4.p.5">would mean: "I prefer Danish, but will accept British English and other types of English". (see also <a href="http://tools.ietf.org/html/rfc4647#section-2.3">Section 2.3</a> of <a href="#RFC4647" id="rfc.xref.RFC4647.2"><cite title="Matching of Language Tags">[RFC4647]</cite></a>)
    26902742      </p>
    … …  
    26962748      </div>
    26972749      <p id="rfc.section.9.4.p.8">It might be contrary to the privacy expectations of the user to send an Accept-Language header field with the complete linguistic
    2698          preferences of the user in every request. For a discussion of this issue, see <a href="#privacy.issues.connected.to.accept.header.fields" title="Privacy Issues Connected to Accept Header Fields">Section&nbsp;12.5</a>.
     2750         preferences of the user in every request. For a discussion of this issue, see <a href="#privacy.issues.connected.to.accept.header.fields" title="Privacy Issues Connected to Accept Header Fields">Section&nbsp;11.5</a>.
    26992751      </p>
    27002752      <p id="rfc.section.9.4.p.9">As intelligibility is highly dependent on the individual user, it is recommended that client applications make the choice
    … …  
    27142766         is strictly to inform the recipient of valid request methods associated with the resource.
    27152767      </p>
    2716       <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.40"></span>  <a href="#header.allow" class="smpl">Allow</a> = #<a href="#methods" class="smpl">method</a>
     2768      <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.40"></span>  <a href="#header.allow" class="smpl">Allow</a> = #<a href="#methods" class="smpl">method</a>
    27172769</pre><p id="rfc.section.9.5.p.3">Example of use:</p>
    2718       <div id="rfc.figure.u.34"></div><pre class="text">  Allow: GET, HEAD, PUT
     2770      <div id="rfc.figure.u.36"></div><pre class="text">  Allow: GET, HEAD, PUT
    27192771</pre><p id="rfc.section.9.5.p.5">The actual set of allowed methods is defined by the origin server at the time of each request.</p>
    27202772      <p id="rfc.section.9.5.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
    … …  
    27282780         its underlying media type.
    27292781      </p>
    2730       <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.41"></span>  <a href="#header.content-encoding" class="smpl">Content-Encoding</a> = 1#<a href="#content.codings" class="smpl">content-coding</a>
     2782      <div id="rfc.figure.u.37"></div><pre class="inline"><span id="rfc.iref.g.41"></span>  <a href="#header.content-encoding" class="smpl">Content-Encoding</a> = 1#<a href="#content.codings" class="smpl">content-coding</a>
    27312783</pre><p id="rfc.section.9.6.p.3">Content codings are defined in <a href="#content.codings" title="Content Codings">Section&nbsp;5.4</a>. An example of its use is
    27322784      </p>
    2733       <div id="rfc.figure.u.36"></div><pre class="text">  Content-Encoding: gzip
     2785      <div id="rfc.figure.u.38"></div><pre class="text">  Content-Encoding: gzip
    27342786</pre><p id="rfc.section.9.6.p.5">The content-coding is a characteristic of the representation. Typically, the representation body is stored with this encoding
    27352787         and is only decoded before rendering or analogous usage. However, a transforming proxy <em class="bcp14">MAY</em> modify the content-coding if the new coding is known to be acceptable to the recipient, unless the "no-transform" cache-control
    … …  
    27552807         that this might not be equivalent to all the languages used within the representation.
    27562808      </p>
    2757       <div id="rfc.figure.u.37"></div><pre class="inline"><span id="rfc.iref.g.42"></span>  <a href="#header.content-language" class="smpl">Content-Language</a> = 1#<a href="#language.tags" class="smpl">language-tag</a>
     2809      <div id="rfc.figure.u.39"></div><pre class="inline"><span id="rfc.iref.g.42"></span>  <a href="#header.content-language" class="smpl">Content-Language</a> = 1#<a href="#language.tags" class="smpl">language-tag</a>
    27582810</pre><p id="rfc.section.9.7.p.3">Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;5.6</a>. The primary purpose of Content-Language is to allow a user to identify and differentiate representations according to the
    27592811         user's own preferred language. Thus, if the body content is intended only for a Danish-literate audience, the appropriate
    27602812         field is
    27612813      </p>
    2762       <div id="rfc.figure.u.38"></div><pre class="text">  Content-Language: da
     2814      <div id="rfc.figure.u.40"></div><pre class="text">  Content-Language: da
    27632815</pre><p id="rfc.section.9.7.p.5">If no Content-Language is specified, the default is that the content is intended for all language audiences. This might mean
    27642816         that the sender does not consider it to be specific to any natural language, or that the sender does not know for which language
    … …  
    27682820         simultaneously in the original Maori and English versions, would call for
    27692821      </p>
    2770       <div id="rfc.figure.u.39"></div><pre class="text">  Content-Language: mi, en
     2822      <div id="rfc.figure.u.41"></div><pre class="text">  Content-Language: mi, en
    27712823</pre><p id="rfc.section.9.7.p.8">However, just because multiple languages are present within a representation does not mean that it is intended for multiple
    27722824         linguistic audiences. An example would be a beginner's language primer, such as "A First Lesson in Latin", which is clearly
    … …  
    27812833         message. In other words, if one were to perform a GET on this URI at the time of this message's generation, then a <a href="#status.200" class="smpl">200 (OK)</a> response would contain the same representation that is enclosed as payload in this message.
    27822834      </p>
    2783       <div id="rfc.figure.u.40"></div><pre class="inline"><span id="rfc.iref.g.43"></span>  <a href="#header.content-location" class="smpl">Content-Location</a> = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
    2784 </pre><p id="rfc.section.9.8.p.3">The Content-Location value is not a replacement for the effective Request URI (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</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>). It is representation metadata. It has the same syntax and semantics as the header field of the same name defined for MIME
     2835      <div id="rfc.figure.u.42"></div><pre class="inline"><span id="rfc.iref.g.43"></span>  <a href="#header.content-location" class="smpl">Content-Location</a> = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
     2836</pre><p id="rfc.section.9.8.p.3">The Content-Location value is not a replacement for the effective Request URI (<a href="p1-messaging.html#effective.request.uri" title="Effective Request URI">Section 5.5</a> of <a href="#Part1" id="rfc.xref.Part1.49"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). It is representation metadata. It has the same syntax and semantics as the header field of the same name defined for MIME
    27852837         body parts in <a href="http://tools.ietf.org/html/rfc2557#section-4">Section 4</a> of <a href="#RFC2557" id="rfc.xref.RFC2557.1"><cite title="MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)">[RFC2557]</cite></a>. However, its appearance in an HTTP message has some special implications for HTTP recipients.
    27862838      </p>
    … …  
    28212873         the media type is that which would have been sent had the request been a GET.
    28222874      </p>
    2823       <div id="rfc.figure.u.41"></div><pre class="inline"><span id="rfc.iref.g.44"></span>  <a href="#header.content-type" class="smpl">Content-Type</a> = <a href="#media.types" class="smpl">media-type</a>
     2875      <div id="rfc.figure.u.43"></div><pre class="inline"><span id="rfc.iref.g.44"></span>  <a href="#header.content-type" class="smpl">Content-Type</a> = <a href="#media.types" class="smpl">media-type</a>
    28242876</pre><p id="rfc.section.9.9.p.3">Media types are defined in <a href="#media.types" title="Media Types">Section&nbsp;5.5</a>. An example of the field is
    28252877      </p>
    2826       <div id="rfc.figure.u.42"></div><pre class="text">  Content-Type: text/html; charset=ISO-8859-4
     2878      <div id="rfc.figure.u.44"></div><pre class="text">  Content-Type: text/html; charset=ISO-8859-4
    28272879</pre><p id="rfc.section.9.9.p.5">Further discussion of Content-Type is provided in <a href="#representation.data" title="Representation Data">Section&nbsp;7.3</a>.
    28282880      </p>
    … …  
    28332885         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;5.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
    28342886      </p>
    2835       <div id="rfc.figure.u.43"></div><pre class="inline"><span id="rfc.iref.g.45"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#http.date" class="smpl">HTTP-date</a>
     2887      <div id="rfc.figure.u.45"></div><pre class="inline"><span id="rfc.iref.g.45"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#http.date" class="smpl">HTTP-date</a>
    28362888</pre><p id="rfc.section.9.10.p.3">An example is</p>
    2837       <div id="rfc.figure.u.44"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
     2889      <div id="rfc.figure.u.46"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
    28382890</pre><p id="rfc.section.9.10.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
    28392891      </p>
    … …  
    28612913      <h2 id="rfc.section.9.11"><a href="#rfc.section.9.11">9.11</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
    28622914      <p id="rfc.section.9.11.p.1">The "Expect" header field is used to indicate that particular server behaviors are required by the client.</p>
    2863       <div id="rfc.figure.u.45"></div><pre class="inline"><span id="rfc.iref.g.46"></span><span id="rfc.iref.g.47"></span><span id="rfc.iref.g.48"></span><span id="rfc.iref.g.49"></span><span id="rfc.iref.g.50"></span>  <a href="#header.expect" class="smpl">Expect</a>       = 1#<a href="#header.expect" class="smpl">expectation</a>
     2915      <div id="rfc.figure.u.47"></div><pre class="inline"><span id="rfc.iref.g.46"></span><span id="rfc.iref.g.47"></span><span id="rfc.iref.g.48"></span><span id="rfc.iref.g.49"></span><span id="rfc.iref.g.50"></span>  <a href="#header.expect" class="smpl">Expect</a>       = 1#<a href="#header.expect" class="smpl">expectation</a>
    28642916 
    2865   <a href="#header.expect" class="smpl">expectation</a>  = <a href="#header.expect" class="smpl">expect-name</a> [ <a href="#abnf.dependencies" class="smpl">BWS</a> "=" <a href="#abnf.dependencies" class="smpl">BWS</a> <a href="#header.expect" class="smpl">expect-value</a> ]
    2866                              *( <a href="#abnf.dependencies" class="smpl">OWS</a> ";" [ <a href="#abnf.dependencies" class="smpl">OWS</a> <a href="#header.expect" class="smpl">expect-param</a> ] )
    2867   <a href="#header.expect" class="smpl">expect-param</a> = <a href="#header.expect" class="smpl">expect-name</a> [ <a href="#abnf.dependencies" class="smpl">BWS</a> "=" <a href="#abnf.dependencies" class="smpl">BWS</a> <a href="#header.expect" class="smpl">expect-value</a> ]
     2917  <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> ]
     2918                             *( <a href="#core.rules" class="smpl">OWS</a> ";" [ <a href="#core.rules" class="smpl">OWS</a> <a href="#header.expect" class="smpl">expect-param</a> ] )
     2919  <a href="#header.expect" class="smpl">expect-param</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> ]
    28682920 
    2869   <a href="#header.expect" class="smpl">expect-name</a>  = <a href="#abnf.dependencies" class="smpl">token</a>
    2870   <a href="#header.expect" class="smpl">expect-value</a> = <a href="#abnf.dependencies" class="smpl">token</a> / <a href="#abnf.dependencies" class="smpl">quoted-string</a>
     2921  <a href="#header.expect" class="smpl">expect-name</a>  = <a href="#core.rules" class="smpl">token</a>
     2922  <a href="#header.expect" class="smpl">expect-value</a> = <a href="#core.rules" class="smpl">token</a> / <a href="#core.rules" class="smpl">quoted-string</a>
    28712923</pre><p id="rfc.section.9.11.p.3">If all received Expect header field(s) are syntactically valid but contain an expectation that the recipient does not understand
    28722924         or cannot comply with, the recipient <em class="bcp14">MUST</em> respond with a <a href="#status.417" class="smpl">417 (Expectation Failed)</a> status code. A recipient of a syntactically invalid Expectation header field <em class="bcp14">MUST</em> respond with a <a href="#status.4xx" class="smpl">4xx</a> status code other than 417.
    … …  
    28762928      </p>
    28772929      <ul class="empty">
    2878          <li>The "100-continue" expectation is defined <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.Part1.36"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. It does not support any expect-params.
     2930         <li>The "100-continue" expectation is defined <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.Part1.50"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. It does not support any expect-params.
    28792931         </li>
    28802932      </ul>
    … …  
    28892941      <p id="rfc.section.9.12.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>:
    28902942      </p>
    2891       <div id="rfc.figure.u.46"></div><pre class="inline"><span id="rfc.iref.g.51"></span>  <a href="#header.from" class="smpl">From</a>    = <a href="#header.from" class="smpl">mailbox</a>
     2943      <div id="rfc.figure.u.48"></div><pre class="inline"><span id="rfc.iref.g.51"></span>  <a href="#header.from" class="smpl">From</a>    = <a href="#header.from" class="smpl">mailbox</a>
    28922944 
    28932945  <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;
    28942946</pre><p id="rfc.section.9.12.p.3">An example is:</p>
    2895       <div id="rfc.figure.u.47"></div><pre class="text">  From: webmaster@example.org
     2947      <div id="rfc.figure.u.49"></div><pre class="text">  From: webmaster@example.org
    28962948</pre><p id="rfc.section.9.12.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
    28972949         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
    … …  
    29102962      <p id="rfc.section.9.13.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.
    29112963      </p>
    2912       <div id="rfc.figure.u.48"></div><pre class="inline"><span id="rfc.iref.g.52"></span>  <a href="#header.location" class="smpl">Location</a> = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
     2964      <div id="rfc.figure.u.50"></div><pre class="inline"><span id="rfc.iref.g.52"></span>  <a href="#header.location" class="smpl">Location</a> = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
    29132965</pre><p id="rfc.section.9.13.p.3">For <a href="#status.201" class="smpl">201 (Created)</a> responses, the Location is the URI of the new resource which was created by the request. For <a href="#status.3xx" class="smpl">3xx (Redirection)</a> responses, the location <em class="bcp14">SHOULD</em> indicate the server's preferred URI for automatic redirection to the resource.
    29142966      </p>
    … …  
    29162968         then the original URI's fragment identifier is added to the final value.
    29172969      </p>
    2918       <div id="rfc.figure.u.49"></div>
     2970      <div id="rfc.figure.u.51"></div>
    29192971      <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
    29202972</pre>  <p>would result in a final value of "http://www.example.org/pub/WWW/People.html#tim"</p>
    2921       <div id="rfc.figure.u.50"></div>
     2973      <div id="rfc.figure.u.52"></div>
    29222974      <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
    29232975</pre>  <p>would result in a final value of "http://www.example.net/index.html#larry", preserving the original fragment identifier.</p>
    … …  
    29422994         to trace a request which appears to be failing or looping mid-chain.
    29432995      </p>
    2944       <div id="rfc.figure.u.51"></div><pre class="inline"><span id="rfc.iref.g.53"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*<a href="#abnf.dependencies" class="smpl">DIGIT</a>
     2996      <div id="rfc.figure.u.53"></div><pre class="inline"><span id="rfc.iref.g.53"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
    29452997</pre><p id="rfc.section.9.14.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
    29462998      <p id="rfc.section.9.14.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).
    … …  
    29623014         non-HTTP URIs (e.g., FTP).
    29633015      </p>
    2964       <div id="rfc.figure.u.52"></div><pre class="inline"><span id="rfc.iref.g.54"></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>
     3016      <div id="rfc.figure.u.54"></div><pre class="inline"><span id="rfc.iref.g.54"></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>
    29653017</pre><p id="rfc.section.9.15.p.5">Example:</p>
    2966       <div id="rfc.figure.u.53"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
    2967 </pre><p id="rfc.section.9.15.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;12.2</a> for security considerations.
     3018      <div id="rfc.figure.u.55"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
     3019</pre><p id="rfc.section.9.15.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.
    29683020      </p>
    29693021      <div id="rfc.iref.r.3"></div>
    … …  
    29743026      </p>
    29753027      <p id="rfc.section.9.16.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>
    2976       <div id="rfc.figure.u.54"></div><pre class="inline"><span id="rfc.iref.g.55"></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>
     3028      <div id="rfc.figure.u.56"></div><pre class="inline"><span id="rfc.iref.g.55"></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>
    29773029</pre><div id="rule.delta-seconds">
    29783030         <p id="rfc.section.9.16.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
    29793031      </div>
    2980       <div id="rfc.figure.u.55"></div><pre class="inline"><span id="rfc.iref.g.56"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#abnf.dependencies" class="smpl">DIGIT</a>
     3032      <div id="rfc.figure.u.57"></div><pre class="inline"><span id="rfc.iref.g.56"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
    29813033</pre><p id="rfc.section.9.16.p.6">Two examples of its use are</p>
    2982       <div id="rfc.figure.u.56"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
     3034      <div id="rfc.figure.u.58"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
    29833035  Retry-After: 120
    29843036</pre><p id="rfc.section.9.16.p.8">In the latter example, the delay is 2 minutes.</p>
    … …  
    29873039      <h2 id="rfc.section.9.17"><a href="#rfc.section.9.17">9.17</a>&nbsp;<a id="header.server" href="#header.server">Server</a></h2>
    29883040      <p id="rfc.section.9.17.p.1">The "Server" header field contains information about the software used by the origin server to handle the request.</p>
    2989       <p id="rfc.section.9.17.p.2">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;5.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.37"><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
     3041      <p id="rfc.section.9.17.p.2">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;5.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.51"><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
    29903042         identifying the application.
    29913043      </p>
    2992       <div id="rfc.figure.u.57"></div><pre class="inline"><span id="rfc.iref.g.57"></span>  <a href="#header.server" class="smpl">Server</a> = <a href="#product.tokens" class="smpl">product</a> *( <a href="#abnf.dependencies" class="smpl">RWS</a> ( <a href="#product.tokens" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
     3044      <div id="rfc.figure.u.59"></div><pre class="inline"><span id="rfc.iref.g.57"></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> ) )
    29933045</pre><p id="rfc.section.9.17.p.4">Example:</p>
    2994       <div id="rfc.figure.u.58"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
    2995 </pre><p id="rfc.section.9.17.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the <a href="#header.server" class="smpl">Server</a> header field. Instead, it <em class="bcp14">MUST</em> include a <a href="p1-messaging.html#header.via" class="smpl">Via</a> field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.38"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
     3046      <div id="rfc.figure.u.60"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
     3047</pre><p id="rfc.section.9.17.p.6">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the <a href="#header.server" class="smpl">Server</a> header field. Instead, it <em class="bcp14">MUST</em> include a <a href="p1-messaging.html#header.via" class="smpl">Via</a> field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.52"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).
    29963048      </p>
    29973049      <div class="note" id="rfc.section.9.17.p.7">
    … …  
    30093061         user agent limitations.
    30103062      </p>
    3011       <p id="rfc.section.9.18.p.3">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;5.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.39"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) identifying the agent and its significant subproducts. By convention, the product tokens are listed in order of their significance
     3063      <p id="rfc.section.9.18.p.3">The field can contain multiple product tokens (<a href="#product.tokens" title="Product Tokens">Section&nbsp;5.2</a>) and comments (<a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a> of <a href="#Part1" id="rfc.xref.Part1.53"><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
    30123064         for identifying the application.
    30133065      </p>
    … …  
    30203072         doing so makes the field value more difficult to parse.
    30213073      </p>
    3022       <div id="rfc.figure.u.59"></div><pre class="inline"><span id="rfc.iref.g.58"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a> = <a href="#product.tokens" class="smpl">product</a> *( <a href="#abnf.dependencies" class="smpl">RWS</a> ( <a href="#product.tokens" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
     3074      <div id="rfc.figure.u.61"></div><pre class="inline"><span id="rfc.iref.g.58"></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> ) )
    30233075</pre><p id="rfc.section.9.18.p.7">Example:</p>
    3024       <div id="rfc.figure.u.60"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    3025 </pre><h1 id="rfc.section.10"><a href="#rfc.section.10">10.</a>&nbsp;<a id="abnf.dependencies" href="#abnf.dependencies">ABNF Rules Defined Elsewhere</a></h1>
    3026       <p id="rfc.section.10.p.1">This specification uses the Augmented Backus-Naur Form (ABNF) notation of <a href="#RFC5234" id="rfc.xref.RFC5234.2"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a> with the list rule extension defined in <a href="p1-messaging.html#notation" title="Syntax Notation">Section 1.2</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>. <a href="#collected.abnf" title="Collected ABNF">Appendix&nbsp;D</a> shows the collected ABNF with the list rule expanded.
    3027       </p>
    3028       <p id="rfc.section.10.p.2">The following core rules are included by reference, as defined in <a href="#RFC5234" id="rfc.xref.RFC5234.3"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a>, <a href="http://tools.ietf.org/html/rfc5234#appendix-B.1">Appendix B.1</a>: ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), HEXDIG
    3029          (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab), LF (line feed), OCTET (any 8-bit sequence of data), SP (space), and VCHAR
    3030          (any visible US-ASCII character).
    3031       </p>
    3032       <p id="rfc.section.10.p.3">The ABNF rules below are defined in other parts:</p>
    3033       <div id="rfc.figure.u.61"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">BWS</a>           = &lt;BWS, defined in <a href="#Part1" id="rfc.xref.Part1.41"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
    3034   <a href="#abnf.dependencies" class="smpl">OWS</a>           = &lt;OWS, defined in <a href="#Part1" id="rfc.xref.Part1.42"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
    3035   <a href="#abnf.dependencies" class="smpl">RWS</a>           = &lt;RWS, defined in <a href="#Part1" id="rfc.xref.Part1.43"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
    3036   <a href="#abnf.dependencies" class="smpl">URI-reference</a> = &lt;URI-reference, defined in <a href="#Part1" id="rfc.xref.Part1.44"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
    3037   <a href="#abnf.dependencies" class="smpl">absolute-URI</a>  = &lt;absolute-URI, defined in <a href="#Part1" id="rfc.xref.Part1.45"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
    3038   <a href="#abnf.dependencies" class="smpl">partial-URI</a>   = &lt;partial-URI, defined in <a href="#Part1" id="rfc.xref.Part1.46"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.8</a>&gt;
    3039   <a href="#abnf.dependencies" class="smpl">quoted-string</a> = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.47"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
    3040   <a href="#abnf.dependencies" class="smpl">qvalue</a>        = &lt;qvalue, defined in <a href="#Part1" id="rfc.xref.Part1.48"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#quality.values" title="Quality Values">Section 4.3.1</a>&gt;
    3041   <a href="#abnf.dependencies" class="smpl">token</a>         = &lt;token, defined in <a href="#Part1" id="rfc.xref.Part1.49"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
    3042   <a href="#abnf.dependencies" class="smpl">word</a>          = &lt;word, defined in <a href="#Part1" id="rfc.xref.Part1.50"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
    3043   <a href="#abnf.dependencies" class="smpl">comment</a>       = &lt;comment, defined in <a href="#Part1" id="rfc.xref.Part1.51"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
    3044 </pre><p id="rfc.section.10.p.5">The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL"
    3045          in this document are to be interpreted as described in <a href="#RFC2119" id="rfc.xref.RFC2119.1"><cite title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</cite></a>.
    3046       </p>
    3047       <h1 id="rfc.section.11"><a href="#rfc.section.11">11.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
    3048       <h2 id="rfc.section.11.1"><a href="#rfc.section.11.1">11.1</a>&nbsp;<a id="method.registration" href="#method.registration">Method Registry</a></h2>
    3049       <p id="rfc.section.11.1.p.1">The registration procedure for HTTP request methods is defined by <a href="#method.registry" title="Method Registry">Section&nbsp;2.2</a> of this document.
    3050       </p>
    3051       <p id="rfc.section.11.1.p.2">The HTTP Method Registry shall be created at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt; and be populated with the registrations below:
     3076      <div id="rfc.figure.u.62"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     3077</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>
     3078      <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>
     3079      <p id="rfc.section.10.1.p.1">The registration procedure for HTTP request methods is defined by <a href="#method.registry" title="Method Registry">Section&nbsp;2.2</a> of this document.
     3080      </p>
     3081      <p id="rfc.section.10.1.p.2">The HTTP Method Registry shall be created at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt; and be populated with the registrations below:
    30523082      </p>
    30533083      <div id="rfc.table.1">
    … …  
    31223152         </table>
    31233153      </div>
    3124       <h2 id="rfc.section.11.2"><a href="#rfc.section.11.2">11.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registry</a></h2>
    3125       <p id="rfc.section.11.2.p.1">The registration procedure for HTTP Status Codes — previously defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.1"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a> — is now defined by <a href="#status.code.registry" title="Status Code Registry">Section&nbsp;4.2</a> of this document.
    3126       </p>
    3127       <p id="rfc.section.11.2.p.2">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
     3154      <h2 id="rfc.section.10.2"><a href="#rfc.section.10.2">10.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registry</a></h2>
     3155      <p id="rfc.section.10.2.p.1">The registration procedure for HTTP Status Codes — previously defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.1"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a> — is now defined by <a href="#status.code.registry" title="Status Code Registry">Section&nbsp;4.2</a> of this document.
     3156      </p>
     3157      <p id="rfc.section.10.2.p.2">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
    31283158      </p>
    31293159      <div id="rfc.table.2">
    … …  
    33573387         </table>
    33583388      </div>
    3359       <h2 id="rfc.section.11.3"><a href="#rfc.section.11.3">11.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
    3360       <p id="rfc.section.11.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#RFC3864" id="rfc.xref.RFC3864.3"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>):
     3389      <h2 id="rfc.section.10.3"><a href="#rfc.section.10.3">10.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
     3390      <p id="rfc.section.10.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#RFC3864" id="rfc.xref.RFC3864.3"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>):
    33613391      </p>
    33623392      <div id="rfc.table.3">
    … …  
    35083538         </table>
    35093539      </div>
    3510       <p id="rfc.section.11.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
    3511       <h2 id="rfc.section.11.4"><a href="#rfc.section.11.4">11.4</a>&nbsp;<a id="content.coding.registration" href="#content.coding.registration">Content Coding Registry</a></h2>
    3512       <p id="rfc.section.11.4.p.1">The registration procedure for HTTP Content Codings is now defined by <a href="#content.coding.registry" title="Content Coding Registry">Section&nbsp;5.4.1</a> of this document.
    3513       </p>
    3514       <p id="rfc.section.11.4.p.2">The HTTP Content Codings Registry located at &lt;<a href="http://www.iana.org/assignments/http-parameters">http://www.iana.org/assignments/http-parameters</a>&gt; shall be updated with the registration below:
     3540      <p id="rfc.section.10.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
     3541      <h2 id="rfc.section.10.4"><a href="#rfc.section.10.4">10.4</a>&nbsp;<a id="content.coding.registration" href="#content.coding.registration">Content Coding Registry</a></h2>
     3542      <p id="rfc.section.10.4.p.1">The registration procedure for HTTP Content Codings is now defined by <a href="#content.coding.registry" title="Content Coding Registry">Section&nbsp;5.4.1</a> of this document.
     3543      </p>
     3544      <p id="rfc.section.10.4.p.2">The HTTP Content Codings Registry located at &lt;<a href="http://www.iana.org/assignments/http-parameters">http://www.iana.org/assignments/http-parameters</a>&gt; shall be updated with the registration below:
    35153545      </p>
    35163546      <div id="rfc.table.4">
    … …  
    35283558                  <td class="left">compress</td>
    35293559                  <td class="left">UNIX "compress" program method</td>
    3530                   <td class="left"> <a href="p1-messaging.html#compress.coding" title="Compress Coding">Section 4.2.1</a> of <a href="#Part1" id="rfc.xref.Part1.52"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
     3560                  <td class="left"> <a href="p1-messaging.html#compress.coding" title="Compress Coding">Section 4.2.1</a> of <a href="#Part1" id="rfc.xref.Part1.54"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
    35313561                  </td>
    35323562               </tr>
    … …  
    35353565                  <td class="left">"deflate" compression mechanism (<a href="#RFC1951" id="rfc.xref.RFC1951.1"><cite title="DEFLATE Compressed Data Format Specification version 1.3">[RFC1951]</cite></a>) used inside the "zlib" data format (<a href="#RFC1950" id="rfc.xref.RFC1950.1"><cite title="ZLIB Compressed Data Format Specification version 3.3">[RFC1950]</cite></a>)
    35363566                  </td>
    3537                   <td class="left"> <a href="p1-messaging.html#deflate.coding" title="Deflate Coding">Section 4.2.2</a> of <a href="#Part1" id="rfc.xref.Part1.53"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
     3567                  <td class="left"> <a href="p1-messaging.html#deflate.coding" title="Deflate Coding">Section 4.2.2</a> of <a href="#Part1" id="rfc.xref.Part1.55"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
    35383568                  </td>
    35393569               </tr>
    … …  
    35413571                  <td class="left">gzip</td>
    35423572                  <td class="left">Same as GNU zip <a href="#RFC1952" id="rfc.xref.RFC1952.1"><cite title="GZIP file format specification version 4.3">[RFC1952]</cite></a></td>
    3543                   <td class="left"> <a href="p1-messaging.html#gzip.coding" title="Gzip Coding">Section 4.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.54"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
     3573                  <td class="left"> <a href="p1-messaging.html#gzip.coding" title="Gzip Coding">Section 4.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.56"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>
    35443574                  </td>
    35453575               </tr>
    … …  
    35543584         </table>
    35553585      </div>
    3556       <h1 id="rfc.section.12"><a href="#rfc.section.12">12.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
    3557       <p id="rfc.section.12.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
     3586      <h1 id="rfc.section.11"><a href="#rfc.section.11">11.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
     3587      <p id="rfc.section.11.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
    35583588         as described by this document. The discussion does not include definitive solutions to the problems revealed, though it does
    35593589         make some suggestions for reducing security risks.
    35603590      </p>
    3561       <h2 id="rfc.section.12.1"><a href="#rfc.section.12.1">12.1</a>&nbsp;<a id="security.sensitive" href="#security.sensitive">Transfer of Sensitive Information</a></h2>
    3562       <p id="rfc.section.12.1.p.1">Like any generic data transfer protocol, HTTP cannot regulate the content of the data that is transferred, nor is there any
     3591      <h2 id="rfc.section.11.1"><a href="#rfc.section.11.1">11.1</a>&nbsp;<a id="security.sensitive" href="#security.sensitive">Transfer of Sensitive Information</a></h2>
     3592      <p id="rfc.section.11.1.p.1">Like any generic data transfer protocol, HTTP cannot regulate the content of the data that is transferred, nor is there any
    35633593         a priori method of determining the sensitivity of any particular piece of information within the context of any given request.
    35643594         Therefore, applications <em class="bcp14">SHOULD</em> supply as much control over this information as possible to the provider of that information. Four header fields are worth
    35653595         special mention in this context: <a href="#header.server" class="smpl">Server</a>, <a href="p1-messaging.html#header.via" class="smpl">Via</a>, <a href="#header.referer" class="smpl">Referer</a> and <a href="#header.from" class="smpl">From</a>.
    35663596      </p>
    3567       <p id="rfc.section.12.1.p.2">Revealing the specific software version of the server might allow the server machine to become more vulnerable to attacks
     3597      <p id="rfc.section.11.1.p.2">Revealing the specific software version of the server might allow the server machine to become more vulnerable to attacks
    35683598         against software that is known to contain security holes. Implementers <em class="bcp14">SHOULD</em> make the <a href="#header.server" class="smpl">Server</a> header field a configurable option.
    35693599      </p>
    3570       <p id="rfc.section.12.1.p.3">Proxies which serve as a portal through a network firewall <em class="bcp14">SHOULD</em> take special precautions regarding the transfer of header information that identifies the hosts behind the firewall. In particular,
     3600      <p id="rfc.section.11.1.p.3">Proxies which serve as a portal through a network firewall <em class="bcp14">SHOULD</em> take special precautions regarding the transfer of header information that identifies the hosts behind the firewall. In particular,
    35713601         they <em class="bcp14">SHOULD</em> remove, or replace with sanitized versions, any <a href="p1-messaging.html#header.via" class="smpl">Via</a> fields generated behind the firewall.
    35723602      </p>
    3573       <p id="rfc.section.12.1.p.4">The <a href="#header.referer" class="smpl">Referer</a> header field allows reading patterns to be studied and reverse links drawn. Although it can be very useful, its power can
     3603      <p id="rfc.section.11.1.p.4">The <a href="#header.referer" class="smpl">Referer</a> header field allows reading patterns to be studied and reverse links drawn. Although it can be very useful, its power can
    35743604         be abused if user details are not separated from the information contained in the Referer. Even when the personal information
    35753605         has been removed, the Referer header field might indicate a private document's URI whose publication would be inappropriate.
    35763606      </p>
    3577       <p id="rfc.section.12.1.p.5">The information sent in the <a href="#header.from" class="smpl">From</a> field might conflict with the user's privacy interests or their site's security policy, and hence it <em class="bcp14">SHOULD NOT</em> be transmitted without the user being able to disable, enable, and modify the contents of the field. The user <em class="bcp14">MUST</em> be able to set the contents of this field within a user preference or application defaults configuration.
    3578       </p>
    3579       <p id="rfc.section.12.1.p.6">We suggest, though do not require, that a convenient toggle interface be provided for the user to enable or disable the sending
     3607      <p id="rfc.section.11.1.p.5">The information sent in the <a href="#header.from" class="smpl">From</a> field might conflict with the user's privacy interests or their site's security policy, and hence it <em class="bcp14">SHOULD NOT</em> be transmitted without the user being able to disable, enable, and modify the contents of the field. The user <em class="bcp14">MUST</em> be able to set the contents of this field within a user preference or application defaults configuration.
     3608      </p>
     3609      <p id="rfc.section.11.1.p.6">We suggest, though do not require, that a convenient toggle interface be provided for the user to enable or disable the sending
    35803610         of <a href="#header.from" class="smpl">From</a> and <a href="#header.referer" class="smpl">Referer</a> information.
    35813611      </p>
    3582       <p id="rfc.section.12.1.p.7">The <a href="#header.user-agent" class="smpl">User-Agent</a> (<a href="#header.user-agent" id="rfc.xref.header.user-agent.4" title="User-Agent">Section&nbsp;9.18</a>) or <a href="#header.server" class="smpl">Server</a> (<a href="#header.server" id="rfc.xref.header.server.3" title="Server">Section&nbsp;9.17</a>) header fields can sometimes be used to determine that a specific client or server has a particular security hole which might
     3612      <p id="rfc.section.11.1.p.7">The <a href="#header.user-agent" class="smpl">User-Agent</a> (<a href="#header.user-agent" id="rfc.xref.header.user-agent.4" title="User-Agent">Section&nbsp;9.18</a>) or <a href="#header.server" class="smpl">Server</a> (<a href="#header.server" id="rfc.xref.header.server.3" title="Server">Section&nbsp;9.17</a>) header fields can sometimes be used to determine that a specific client or server has a particular security hole which might
    35833613         be exploited. Unfortunately, this same information is often used for other valuable purposes for which HTTP currently has
    35843614         no better mechanism.
    35853615      </p>
    3586       <p id="rfc.section.12.1.p.8">Furthermore, the <a href="#header.user-agent" class="smpl">User-Agent</a> header field might contain enough entropy to be used, possibly in conjunction with other material, to uniquely identify the
     3616      <p id="rfc.section.11.1.p.8">Furthermore, the <a href="#header.user-agent" class="smpl">User-Agent</a> header field might contain enough entropy to be used, possibly in conjunction with other material, to uniquely identify the
    35873617         user.
    35883618      </p>
    3589       <p id="rfc.section.12.1.p.9">Some request methods, like TRACE (<a href="#TRACE" id="rfc.xref.TRACE.3" title="TRACE">Section&nbsp;2.3.7</a>), expose information that was sent in request header fields within the body of their response. Clients <em class="bcp14">SHOULD</em> be careful with sensitive information, like Cookies, Authorization credentials, and other header fields that might be used
     3619      <p id="rfc.section.11.1.p.9">Some request methods, like TRACE (<a href="#TRACE" id="rfc.xref.TRACE.3" title="TRACE">Section&nbsp;2.3.7</a>), expose information that was sent in request header fields within the body of their response. Clients <em class="bcp14">SHOULD</em> be careful with sensitive information, like Cookies, Authorization credentials, and other header fields that might be used
    35903620         to collect data from the client.
    35913621      </p>
    3592       <h2 id="rfc.section.12.2"><a href="#rfc.section.12.2">12.2</a>&nbsp;<a id="encoding.sensitive.information.in.uris" href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></h2>
    3593       <p id="rfc.section.12.2.p.1">Because the source of a link might be private information or might reveal an otherwise private information source, it is strongly
     3622      <h2 id="rfc.section.11.2"><a href="#rfc.section.11.2">11.2</a>&nbsp;<a id="encoding.sensitive.information.in.uris" href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></h2>
     3623      <p id="rfc.section.11.2.p.1">Because the source of a link might be private information or might reveal an otherwise private information source, it is strongly
    35943624         recommended that the user be able to select whether or not the <a href="#header.referer" class="smpl">Referer</a> field is sent. For example, a browser client could have a toggle switch for browsing openly/anonymously, which would respectively
    35953625         enable/disable the sending of Referer and From information.
    35963626      </p>
    3597       <p id="rfc.section.12.2.p.2">Clients <em class="bcp14">SHOULD NOT</em> include a <a href="#header.referer" class="smpl">Referer</a> header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
    3598       </p>
    3599       <p id="rfc.section.12.2.p.3">Authors of services <em class="bcp14">SHOULD NOT</em> use GET-based forms for the submission of sensitive data because that data will be placed in the request-target. Many existing
     3627      <p id="rfc.section.11.2.p.2">Clients <em class="bcp14">SHOULD NOT</em> include a <a href="#header.referer" class="smpl">Referer</a> header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
     3628      </p>
     3629      <p id="rfc.section.11.2.p.3">Authors of services <em class="bcp14">SHOULD NOT</em> use GET-based forms for the submission of sensitive data because that data will be placed in the request-target. Many existing
    36003630         servers, proxies, and user agents log or display the request-target in places where it might be visible to third parties.
    36013631         Such services can use POST-based form submission instead.
    36023632      </p>
    3603       <h2 id="rfc.section.12.3"><a href="#rfc.section.12.3">12.3</a>&nbsp;<a id="location.spoofing-leakage" href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></h2>
    3604       <p id="rfc.section.12.3.p.1">If a single server supports multiple organizations that do not trust one another, then it <em class="bcp14">MUST</em> check the values of <a href="#header.location" class="smpl">Location</a> and <a href="#header.content-location" class="smpl">Content-Location</a> header fields in responses that are generated under control of said organizations to make sure that they do not attempt to
     3633      <h2 id="rfc.section.11.3"><a href="#rfc.section.11.3">11.3</a>&nbsp;<a id="location.spoofing-leakage" href="#location.spoofing-leakage">Location Header Fields: Spoofing and Information Leakage</a></h2>
     3634      <p id="rfc.section.11.3.p.1">If a single server supports multiple organizations that do not trust one another, then it <em class="bcp14">MUST</em> check the values of <a href="#header.location" class="smpl">Location</a> and <a href="#header.content-location" class="smpl">Content-Location</a> header fields in responses that are generated under control of said organizations to make sure that they do not attempt to
    36053635         invalidate resources over which they have no authority.
    36063636      </p>
    3607       <p id="rfc.section.12.3.p.2">Furthermore, appending the fragment identifier from one URI to another one obtained from a <a href="#header.location" class="smpl">Location</a> header field might leak confidential information to the target server — although the fragment identifier is not transmitted
     3637      <p id="rfc.section.11.3.p.2">Furthermore, appending the fragment identifier from one URI to another one obtained from a <a href="#header.location" class="smpl">Location</a> header field might leak confidential information to the target server — although the fragment identifier is not transmitted
    36083638         in the final request, it might be visible to the user agent through other means, such as scripting.
    36093639      </p>
    3610       <h2 id="rfc.section.12.4"><a href="#rfc.section.12.4">12.4</a>&nbsp;Security Considerations for CONNECT
     3640      <h2 id="rfc.section.11.4"><a href="#rfc.section.11.4">11.4</a>&nbsp;Security Considerations for CONNECT
    36113641      </h2>
    3612       <p id="rfc.section.12.4.p.1">Since tunneled data is opaque to the proxy, there are additional risks to tunneling to other well-known or reserved ports.
     3642      <p id="rfc.section.11.4.p.1">Since tunneled data is opaque to the proxy, there are additional risks to tunneling to other well-known or reserved ports.
    36133643         A HTTP client CONNECTing to port 25 could relay spam via SMTP, for example. As such, proxies <em class="bcp14">SHOULD</em> restrict CONNECT access to a small number of known ports.
    36143644      </p>
    3615       <h2 id="rfc.section.12.5"><a href="#rfc.section.12.5">12.5</a>&nbsp;<a id="privacy.issues.connected.to.accept.header.fields" href="#privacy.issues.connected.to.accept.header.fields">Privacy Issues Connected to Accept Header Fields</a></h2>
    3616       <p id="rfc.section.12.5.p.1">Accept header fields can reveal information about the user to all servers which are accessed. The <a href="#header.accept-language" class="smpl">Accept-Language</a> header field in particular can reveal information the user would consider to be of a private nature, because the understanding
     3645      <h2 id="rfc.section.11.5"><a href="#rfc.section.11.5">11.5</a>&nbsp;<a id="privacy.issues.connected.to.accept.header.fields" href="#privacy.issues.connected.to.accept.header.fields">Privacy Issues Connected to Accept Header Fields</a></h2>
     3646      <p id="rfc.section.11.5.p.1">Accept header fields can reveal information about the user to all servers which are accessed. The <a href="#header.accept-language" class="smpl">Accept-Language</a> header field in particular can reveal information the user would consider to be of a private nature, because the understanding
    36173647         of particular languages is often strongly correlated to the membership of a particular ethnic group. User agents which offer
    36183648         the option to configure the contents of an Accept-Language header field to be sent in every request are strongly encouraged
    36193649         to let the configuration process include a message which makes the user aware of the loss of privacy involved.
    36203650      </p>
    3621       <p id="rfc.section.12.5.p.2">An approach that limits the loss of privacy would be for a user agent to omit the sending of Accept-Language header fields
     3651      <p id="rfc.section.11.5.p.2">An approach that limits the loss of privacy would be for a user agent to omit the sending of Accept-Language header fields
    36223652         by default, and to ask the user whether or not to start sending Accept-Language header fields to a server if it detects, by
    36233653         looking for any <a href="p6-cache.html#header.vary" class="smpl">Vary</a> header fields generated by the server, that such sending could improve the quality of service.
    36243654      </p>
    3625       <p id="rfc.section.12.5.p.3">Elaborate user-customized accept header fields sent in every request, in particular if these include quality values, can be
     3655      <p id="rfc.section.11.5.p.3">Elaborate user-customized accept header fields sent in every request, in particular if these include quality values, can be
    36263656         used by servers as relatively reliable and long-lived user identifiers. Such user identifiers would allow content providers
    36273657         to do click-trail tracking, and would allow collaborating content providers to match cross-server click-trails or form submissions
    … …  
    36323662         field configurability <em class="bcp14">SHOULD</em> warn users about the loss of privacy which can be involved.
    36333663      </p>
    3634       <h1 id="rfc.section.13"><a href="#rfc.section.13">13.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
    3635       <p id="rfc.section.13.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.55"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
    3636       </p>
    3637       <h1 id="rfc.references"><a id="rfc.section.14" href="#rfc.section.14">14.</a> References
     3664      <h1 id="rfc.section.12"><a href="#rfc.section.12">12.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
     3665      <p id="rfc.section.12.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.57"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>.
     3666      </p>
     3667      <h1 id="rfc.references"><a id="rfc.section.13" href="#rfc.section.13">13.</a> References
    36383668      </h1>
    3639       <h2 id="rfc.references.1"><a href="#rfc.section.14.1" id="rfc.section.14.1">14.1</a> Normative References
     3669      <h2 id="rfc.references.1"><a href="#rfc.section.13.1" id="rfc.section.13.1">13.1</a> Normative References
    36403670      </h2>
    36413671      <table>                             
    … …  
    37163746         </tr>
    37173747      </table>
    3718       <h2 id="rfc.references.2"><a href="#rfc.section.14.2" id="rfc.section.14.2">14.2</a> Informative References
     3748      <h2 id="rfc.references.2"><a href="#rfc.section.13.2" id="rfc.section.13.2">13.2</a> Informative References
    37193749      </h2>
    37203750      <table>                                         
    … …  
    38543884         MIME environments.
    38553885      </p>
    3856       <div id="rfc.figure.u.62"></div><pre class="inline"><span id="rfc.iref.g.59"></span>  <a href="#mime-version" class="smpl">MIME-Version</a> = 1*<a href="#abnf.dependencies" class="smpl">DIGIT</a> "." 1*<a href="#abnf.dependencies" class="smpl">DIGIT</a>
     3886      <div id="rfc.figure.u.63"></div><pre class="inline"><span id="rfc.iref.g.59"></span>  <a href="#mime-version" class="smpl">MIME-Version</a> = 1*<a href="#notation" class="smpl">DIGIT</a> "." 1*<a href="#notation" class="smpl">DIGIT</a>
    38573887</pre><p id="rfc.section.A.1.p.3">MIME version "1.0" is the default for use in HTTP/1.1. However, HTTP/1.1 message parsing and semantics are defined by this
    38583888         document and not the MIME specification.
    … …  
    39413971      <p id="rfc.section.C.p.16">Allow <a href="#header.referer" class="smpl">Referer</a> 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;9.15</a>)
    39423972      </p>
    3943       <p id="rfc.section.C.p.17">In the description of the <a href="#header.server" class="smpl">Server</a> header field, the <a href="p1-messaging.html#header.via" class="smpl">Via</a> field was described as a SHOULD. The requirement was and is stated correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.56"><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;9.17</a>)
     3973      <p id="rfc.section.C.p.17">In the description of the <a href="#header.server" class="smpl">Server</a> header field, the <a href="p1-messaging.html#header.via" class="smpl">Via</a> field was described as a SHOULD. The requirement was and is stated correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 6.2</a> of <a href="#Part1" id="rfc.xref.Part1.58"><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;9.17</a>)
    39443974      </p>
    39453975      <p id="rfc.section.C.p.18">Clarify contexts that charset is used in. (<a href="#character.sets" title="Character Encodings (charset)">Section&nbsp;5.3</a>)
    … …  
    39653995      </p>
    39663996      <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    3967       <div id="rfc.figure.u.63"></div> <pre class="inline"><a href="#header.accept" class="smpl">Accept</a> = [ ( "," / ( media-range [ accept-params ] ) ) *( OWS "," [
     3997      <div id="rfc.figure.u.64"></div> <pre class="inline"><a href="#header.accept" class="smpl">Accept</a> = [ ( "," / ( media-range [ accept-params ] ) ) *( OWS "," [
    39683998 OWS ( media-range [ accept-params ] ) ] ) ]
    39693999<a href="#header.accept-charset" class="smpl">Accept-Charset</a> = *( "," OWS ) ( ( charset / "*" ) [ OWS ";" OWS "q="
    … …  
    39774007<a href="#header.allow" class="smpl">Allow</a> = [ ( "," / method ) *( OWS "," [ OWS method ] ) ]
    39784008
    3979 <a href="#abnf.dependencies" class="smpl">BWS</a> = &lt;BWS, defined in [Part1], Section 3.2.1&gt;
     4009<a href="#core.rules" class="smpl">BWS</a> = &lt;BWS, defined in [Part1], Section 3.2.1&gt;
    39804010
    39814011<a href="#header.content-encoding" class="smpl">Content-Encoding</a> = *( "," OWS ) content-coding *( OWS "," [ OWS
    … …  
    40014031<a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*DIGIT
    40024032
    4003 <a href="#abnf.dependencies" class="smpl">OWS</a> = &lt;OWS, defined in [Part1], Section 3.2.1&gt;
     4033<a href="#core.rules" class="smpl">OWS</a> = &lt;OWS, defined in [Part1], Section 3.2.1&gt;
    40044034
    4005 <a href="#abnf.dependencies" class="smpl">RWS</a> = &lt;RWS, defined in [Part1], Section 3.2.1&gt;
     4035<a href="#core.rules" class="smpl">RWS</a> = &lt;RWS, defined in [Part1], Section 3.2.1&gt;
    40064036<a href="#header.referer" class="smpl">Referer</a> = absolute-URI / partial-URI
    40074037<a href="#header.retry-after" class="smpl">Retry-After</a> = HTTP-date / delta-seconds
    … …  
    40804110<a href="#product.tokens" class="smpl">product-version</a> = token
    40814111
    4082 <a href="#abnf.dependencies" class="smpl">quoted-string</a> = &lt;quoted-string, defined in [Part1], Section 3.2.4&gt;
     4112<a href="#core.rules" class="smpl">quoted-string</a> = &lt;quoted-string, defined in [Part1], Section 3.2.4&gt;
    40834113<a href="#abnf.dependencies" class="smpl">qvalue</a> = &lt;qvalue, defined in [Part1], Section 4.3.1&gt;
    40844114
    … …  
    40904120
    40914121<a href="#preferred.date.format" class="smpl">time-of-day</a> = hour ":" minute ":" second
    4092 <a href="#abnf.dependencies" class="smpl">token</a> = &lt;token, defined in [Part1], Section 3.2.4&gt;
     4122<a href="#core.rules" class="smpl">token</a> = &lt;token, defined in [Part1], Section 3.2.4&gt;
    40934123<a href="#media.types" class="smpl">type</a> = token
    40944124
    40954125<a href="#rule.parameter" class="smpl">value</a> = word
    40964126
    4097 <a href="#abnf.dependencies" class="smpl">word</a> = &lt;word, defined in [Part1], Section 3.2.4&gt;
     4127<a href="#core.rules" class="smpl">word</a> = &lt;word, defined in [Part1], Section 3.2.4&gt;
    40984128
    40994129<a href="#preferred.date.format" class="smpl">year</a> = 4DIGIT
    … …  
    46684698         <ul class="ind">
    46694699            <li><a id="rfc.index.1" href="#rfc.index.1"><b>1</b></a><ul>
    4670                   <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.21"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">11.2</a></li>
     4700                  <li>100 Continue (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.21"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">10.2</a></li>
    46714701                  <li>100-continue (expect value)&nbsp;&nbsp;<a href="#rfc.iref.139"><b>9.11</b></a></li>
    4672                   <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.22"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">11.2</a></li>
     4702                  <li>101 Switching Protocols (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.22"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">10.2</a></li>
    46734703                  <li>1xx Informational (status code class)&nbsp;&nbsp;<a href="#rfc.iref.20"><b>4.3</b></a></li>
    46744704               </ul>
    46754705            </li>
    46764706            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    4677                   <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">11.2</a></li>
    4678                   <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">11.2</a></li>
    4679                   <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">11.2</a></li>
    4680                   <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">11.2</a>, <a href="#rfc.xref.status.203.3">C</a></li>
    4681                   <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">11.2</a></li>
    4682                   <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">11.2</a></li>
     4707                  <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">10.2</a></li>
     4708                  <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">10.2</a></li>
     4709                  <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">10.2</a></li>
     4710                  <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">10.2</a>, <a href="#rfc.xref.status.203.3">C</a></li>
     4711                  <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">10.2</a></li>
     4712                  <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">10.2</a></li>
    46834713                  <li>2xx Successful (status code class)&nbsp;&nbsp;<a href="#rfc.iref.23"><b>4.4</b></a></li>
    46844714               </ul>
    46854715            </li>
    46864716            <li><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul>
    4687                   <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.31"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">11.2</a></li>
    4688                   <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.32"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">11.2</a>, <a href="#rfc.xref.status.301.3">C</a></li>
    4689                   <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.33"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">11.2</a>, <a href="#rfc.xref.status.302.3">C</a></li>
    4690                   <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.34"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">11.2</a></li>
    4691                   <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.35"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">11.2</a>, <a href="#rfc.xref.status.305.3">C</a></li>
    4692                   <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.36"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">11.2</a></li>
    4693                   <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.37"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">11.2</a>, <a href="#rfc.xref.status.307.3">C</a></li>
     4717                  <li>300 Multiple Choices (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.31"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">10.2</a></li>
     4718                  <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.32"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">10.2</a>, <a href="#rfc.xref.status.301.3">C</a></li>
     4719                  <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.33"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">10.2</a>, <a href="#rfc.xref.status.302.3">C</a></li>
     4720                  <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.34"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">10.2</a></li>
     4721                  <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.35"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">10.2</a>, <a href="#rfc.xref.status.305.3">C</a></li>
     4722                  <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.36"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">10.2</a></li>
     4723                  <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.37"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">10.2</a>, <a href="#rfc.xref.status.307.3">C</a></li>
    46944724                  <li>3xx Redirection (status code class)&nbsp;&nbsp;<a href="#rfc.iref.30"><b>4.5</b></a>, <a href="#rfc.xref.status.3xx.1">C</a></li>
    46954725               </ul>
    46964726            </li>
    46974727            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
    4698                   <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.39"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">11.2</a></li>
    4699                   <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.40"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">11.2</a></li>
    4700                   <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.41"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">11.2</a></li>
    4701                   <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.42"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">11.2</a></li>
    4702                   <li>405 Method Not Allowed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.43"><b>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">11.2</a></li>
    4703                   <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.44"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">11.2</a></li>
    4704                   <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.45"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">11.2</a></li>
    4705                   <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.46"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">11.2</a></li>
    4706                   <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.47"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">11.2</a></li>
    4707                   <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.48"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">11.2</a></li>
    4708                   <li>413 Request Representation Too Large (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.49"><b>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">11.2</a></li>
    4709                   <li>414 URI Too Long (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.50"><b>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">11.2</a></li>
    4710                   <li>415 Unsupported Media Type (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.51"><b>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">11.2</a></li>
    4711                   <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.52"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">11.2</a></li>
    4712                   <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.53"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">11.2</a>, <a href="#rfc.xref.status.426.3">C</a></li>
     4728                  <li>400 Bad Request (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.39"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">10.2</a></li>
     4729                  <li>402 Payment Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.40"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">10.2</a></li>
     4730                  <li>403 Forbidden (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.41"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">10.2</a></li>
     4731                  <li>404 Not Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.42"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">10.2</a></li>
     4732                  <li>405 Method Not Allowed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.43"><b>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">10.2</a></li>
     4733                  <li>406 Not Acceptable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.44"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">10.2</a></li>
     4734                  <li>408 Request Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.45"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">10.2</a></li>
     4735                  <li>409 Conflict (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.46"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">10.2</a></li>
     4736                  <li>410 Gone (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.47"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">10.2</a></li>
     4737                  <li>411 Length Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.48"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">10.2</a></li>
     4738                  <li>413 Request Representation Too Large (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.49"><b>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">10.2</a></li>
     4739                  <li>414 URI Too Long (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.50"><b>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">10.2</a></li>
     4740                  <li>415 Unsupported Media Type (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.51"><b>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">10.2</a></li>
     4741                  <li>417 Expectation Failed (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.52"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">10.2</a></li>
     4742                  <li>426 Upgrade Required (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.53"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">10.2</a>, <a href="#rfc.xref.status.426.3">C</a></li>
    47134743                  <li>4xx Client Error (status code class)&nbsp;&nbsp;<a href="#rfc.iref.38"><b>4.6</b></a></li>
    47144744               </ul>
    47154745            </li>
    47164746            <li><a id="rfc.index.5" href="#rfc.index.5"><b>5</b></a><ul>
    4717                   <li>500 Internal Server Error (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.55"><b>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">11.2</a></li>
    4718                   <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.56"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">11.2</a></li>
    4719                   <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.57"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">11.2</a></li>
    4720                   <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.58"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">11.2</a></li>
    4721                   <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.59"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">11.2</a></li>
    4722                   <li>505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.60"><b>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">11.2</a></li>
     4747                  <li>500 Internal Server Error (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.55"><b>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">10.2</a></li>
     4748                  <li>501 Not Implemented (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.56"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">10.2</a></li>
     4749                  <li>502 Bad Gateway (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.57"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">10.2</a></li>
     4750                  <li>503 Service Unavailable (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.58"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">10.2</a></li>
     4751                  <li>504 Gateway Timeout (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.59"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">10.2</a></li>
     4752                  <li>505 HTTP Version Not Supported (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.60"><b>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">10.2</a></li>
    47234753                  <li>5xx Server Error (status code class)&nbsp;&nbsp;<a href="#rfc.iref.54"><b>4.7</b></a></li>
    47244754               </ul>
    47254755            </li>
    47264756            <li><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul>
    4727                   <li>Accept header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept.1">3.2</a>, <a href="#rfc.xref.header.accept.2">5.5</a>, <a href="#rfc.xref.header.accept.3">8.1</a>, <a href="#rfc.iref.a.1"><b>9.1</b></a>, <a href="#rfc.xref.header.accept.4">11.3</a></li>
    4728                   <li>Accept-Charset header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-charset.1">3.2</a>, <a href="#rfc.xref.header.accept-charset.2">8.1</a>, <a href="#rfc.iref.a.2"><b>9.2</b></a>, <a href="#rfc.xref.header.accept-charset.3">11.3</a>, <a href="#rfc.xref.header.accept-charset.4">C</a></li>
    4729                   <li>Accept-Encoding header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.4</a>, <a href="#rfc.xref.header.accept-encoding.3">8.1</a>, <a href="#rfc.iref.a.3"><b>9.3</b></a>, <a href="#rfc.xref.header.accept-encoding.4">11.3</a>, <a href="#rfc.xref.header.accept-encoding.5">11.4</a></li>
    4730                   <li>Accept-Language header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-language.1">3.2</a>, <a href="#rfc.xref.header.accept-language.2">8.1</a>, <a href="#rfc.iref.a.4"><b>9.4</b></a>, <a href="#rfc.xref.header.accept-language.3">11.3</a></li>
    4731                   <li>Allow header field&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.a.5"><b>9.5</b></a>, <a href="#rfc.xref.header.allow.3">11.3</a>, <a href="#rfc.xref.header.allow.4">C</a></li>
     4757                  <li>Accept header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept.1">3.2</a>, <a href="#rfc.xref.header.accept.2">5.5</a>, <a href="#rfc.xref.header.accept.3">8.1</a>, <a href="#rfc.iref.a.1"><b>9.1</b></a>, <a href="#rfc.xref.header.accept.4">10.3</a></li>
     4758                  <li>Accept-Charset header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-charset.1">3.2</a>, <a href="#rfc.xref.header.accept-charset.2">8.1</a>, <a href="#rfc.iref.a.2"><b>9.2</b></a>, <a href="#rfc.xref.header.accept-charset.3">10.3</a>, <a href="#rfc.xref.header.accept-charset.4">C</a></li>
     4759                  <li>Accept-Encoding header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.4</a>, <a href="#rfc.xref.header.accept-encoding.3">8.1</a>, <a href="#rfc.iref.a.3"><b>9.3</b></a>, <a href="#rfc.xref.header.accept-encoding.4">10.3</a>, <a href="#rfc.xref.header.accept-encoding.5">10.4</a></li>
     4760                  <li>Accept-Language header field&nbsp;&nbsp;<a href="#rfc.xref.header.accept-language.1">3.2</a>, <a href="#rfc.xref.header.accept-language.2">8.1</a>, <a href="#rfc.iref.a.4"><b>9.4</b></a>, <a href="#rfc.xref.header.accept-language.3">10.3</a></li>
     4761                  <li>Allow header field&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.a.5"><b>9.5</b></a>, <a href="#rfc.xref.header.allow.3">10.3</a>, <a href="#rfc.xref.header.allow.4">C</a></li>
    47324762               </ul>
    47334763            </li>
    … …  
    47414771                  </li>
    47424772                  <li>compress (Coding Format)&nbsp;&nbsp;<a href="#rfc.iref.c.3">5.4</a></li>
    4743                   <li>CONNECT method&nbsp;&nbsp;<a href="#rfc.iref.c.2"><b>2.3.8</b></a>, <a href="#rfc.xref.CONNECT.1">11.1</a>, <a href="#rfc.xref.CONNECT.2">C</a></li>
     4773                  <li>CONNECT method&nbsp;&nbsp;<a href="#rfc.iref.c.2"><b>2.3.8</b></a>, <a href="#rfc.xref.CONNECT.1">10.1</a>, <a href="#rfc.xref.CONNECT.2">C</a></li>
    47444774                  <li>content negotiation&nbsp;&nbsp;<a href="#rfc.iref.c.1">1</a></li>
    4745                   <li>Content-Encoding header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-encoding.1">5.4</a>, <a href="#rfc.xref.header.content-encoding.2">7.2</a>, <a href="#rfc.iref.c.7"><b>9.6</b></a>, <a href="#rfc.xref.header.content-encoding.3">11.3</a></li>
    4746                   <li>Content-Language header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-language.1">7.2</a>, <a href="#rfc.iref.c.8"><b>9.7</b></a>, <a href="#rfc.xref.header.content-language.2">11.3</a></li>
    4747                   <li>Content-Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-location.1">2.3.4</a>, <a href="#rfc.xref.header.content-location.2">7.2</a>, <a href="#rfc.iref.c.9"><b>9.8</b></a>, <a href="#rfc.xref.header.content-location.3">9.13</a>, <a href="#rfc.xref.header.content-location.4">11.3</a>, <a href="#rfc.xref.header.content-location.5">C</a></li>
     4775                  <li>Content-Encoding header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-encoding.1">5.4</a>, <a href="#rfc.xref.header.content-encoding.2">7.2</a>, <a href="#rfc.iref.c.7"><b>9.6</b></a>, <a href="#rfc.xref.header.content-encoding.3">10.3</a></li>
     4776                  <li>Content-Language header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-language.1">7.2</a>, <a href="#rfc.iref.c.8"><b>9.7</b></a>, <a href="#rfc.xref.header.content-language.2">10.3</a></li>
     4777                  <li>Content-Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-location.1">2.3.4</a>, <a href="#rfc.xref.header.content-location.2">7.2</a>, <a href="#rfc.iref.c.9"><b>9.8</b></a>, <a href="#rfc.xref.header.content-location.3">9.13</a>, <a href="#rfc.xref.header.content-location.4">10.3</a>, <a href="#rfc.xref.header.content-location.5">C</a></li>
    47484778                  <li>Content-Transfer-Encoding header field&nbsp;&nbsp;<a href="#rfc.iref.c.11">A.5</a>, <a href="#rfc.xref.no.content-transfer-encoding.1">C</a></li>
    4749                   <li>Content-Type header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-type.1">3.1</a>, <a href="#rfc.xref.header.content-type.2">4</a>, <a href="#rfc.xref.header.content-type.3">5.5</a>, <a href="#rfc.xref.header.content-type.4">7.2</a>, <a href="#rfc.iref.c.10"><b>9.9</b></a>, <a href="#rfc.xref.header.content-type.5">11.3</a></li>
     4779                  <li>Content-Type header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-type.1">3.1</a>, <a href="#rfc.xref.header.content-type.2">4</a>, <a href="#rfc.xref.header.content-type.3">5.5</a>, <a href="#rfc.xref.header.content-type.4">7.2</a>, <a href="#rfc.iref.c.10"><b>9.9</b></a>, <a href="#rfc.xref.header.content-type.5">10.3</a></li>
    47504780               </ul>
    47514781            </li>
    47524782            <li><a id="rfc.index.D" href="#rfc.index.D"><b>D</b></a><ul>
    4753                   <li>Date header field&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.d.3"><b>9.10</b></a>, <a href="#rfc.xref.header.date.2">11.3</a></li>
     4783                  <li>Date header field&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.d.3"><b>9.10</b></a>, <a href="#rfc.xref.header.date.2">10.3</a></li>
    47544784                  <li>deflate (Coding Format)&nbsp;&nbsp;<a href="#rfc.iref.d.2">5.4</a></li>
    4755                   <li>DELETE method&nbsp;&nbsp;<a href="#rfc.iref.d.1"><b>2.3.6</b></a>, <a href="#rfc.xref.DELETE.1">11.1</a></li>
    4756                   <li><em>draft-reschke-http-status-308</em>&nbsp;&nbsp;<a href="#rfc.xref.draft-reschke-http-status-308.1">4.5.7</a>, <a href="#draft-reschke-http-status-308"><b>14.2</b></a></li>
     4785                  <li>DELETE method&nbsp;&nbsp;<a href="#rfc.iref.d.1"><b>2.3.6</b></a>, <a href="#rfc.xref.DELETE.1">10.1</a></li>
     4786                  <li><em>draft-reschke-http-status-308</em>&nbsp;&nbsp;<a href="#rfc.xref.draft-reschke-http-status-308.1">4.5.7</a>, <a href="#draft-reschke-http-status-308"><b>13.2</b></a></li>
    47574787               </ul>
    47584788            </li>
    47594789            <li><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul>
    4760                   <li>Expect header field&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.6.14</a>, <a href="#rfc.iref.e.1"><b>9.11</b></a>, <a href="#rfc.xref.header.expect.3">11.3</a>, <a href="#rfc.xref.header.expect.4">C</a></li>
     4790                  <li>Expect header field&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.6.14</a>, <a href="#rfc.iref.e.1"><b>9.11</b></a>, <a href="#rfc.xref.header.expect.3">10.3</a>, <a href="#rfc.xref.header.expect.4">C</a></li>
    47614791                  <li>Expect Values&nbsp;&nbsp;
    47624792                     <ul>
    … …  
    47674797            </li>
    47684798            <li><a id="rfc.index.F" href="#rfc.index.F"><b>F</b></a><ul>
    4769                   <li>From header field&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.f.1"><b>9.12</b></a>, <a href="#rfc.xref.header.from.2">11.3</a></li>
     4799                  <li>From header field&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.f.1"><b>9.12</b></a>, <a href="#rfc.xref.header.from.2">10.3</a></li>
    47704800               </ul>
    47714801            </li>
    47724802            <li><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul>
    4773                   <li>GET method&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>2.3.2</b></a>, <a href="#rfc.xref.GET.1">11.1</a></li>
     4803                  <li>GET method&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>2.3.2</b></a>, <a href="#rfc.xref.GET.1">10.1</a></li>
    47744804                  <li><tt>Grammar</tt>&nbsp;&nbsp;
    47754805                     <ul>
    … …  
    48374867            </li>
    48384868            <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul>
    4839                   <li>HEAD method&nbsp;&nbsp;<a href="#rfc.iref.h.1"><b>2.3.3</b></a>, <a href="#rfc.xref.HEAD.1">11.1</a></li>
     4869                  <li>HEAD method&nbsp;&nbsp;<a href="#rfc.iref.h.1"><b>2.3.3</b></a>, <a href="#rfc.xref.HEAD.1">10.1</a></li>
    48404870                  <li>Header Fields&nbsp;&nbsp;
    48414871                     <ul>
    4842                         <li>Accept&nbsp;&nbsp;<a href="#rfc.xref.header.accept.1">3.2</a>, <a href="#rfc.xref.header.accept.2">5.5</a>, <a href="#rfc.xref.header.accept.3">8.1</a>, <a href="#rfc.iref.h.2"><b>9.1</b></a>, <a href="#rfc.xref.header.accept.4">11.3</a></li>
    4843                         <li>Accept-Charset&nbsp;&nbsp;<a href="#rfc.xref.header.accept-charset.1">3.2</a>, <a href="#rfc.xref.header.accept-charset.2">8.1</a>, <a href="#rfc.iref.h.3"><b>9.2</b></a>, <a href="#rfc.xref.header.accept-charset.3">11.3</a>, <a href="#rfc.xref.header.accept-charset.4">C</a></li>
    4844                         <li>Accept-Encoding&nbsp;&nbsp;<a href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.4</a>, <a href="#rfc.xref.header.accept-encoding.3">8.1</a>, <a href="#rfc.iref.h.4"><b>9.3</b></a>, <a href="#rfc.xref.header.accept-encoding.4">11.3</a>, <a href="#rfc.xref.header.accept-encoding.5">11.4</a></li>
    4845                         <li>Accept-Language&nbsp;&nbsp;<a href="#rfc.xref.header.accept-language.1">3.2</a>, <a href="#rfc.xref.header.accept-language.2">8.1</a>, <a href="#rfc.iref.h.5"><b>9.4</b></a>, <a href="#rfc.xref.header.accept-language.3">11.3</a></li>
    4846                         <li>Allow&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.h.6"><b>9.5</b></a>, <a href="#rfc.xref.header.allow.3">11.3</a>, <a href="#rfc.xref.header.allow.4">C</a></li>
    4847                         <li>Content-Encoding&nbsp;&nbsp;<a href="#rfc.xref.header.content-encoding.1">5.4</a>, <a href="#rfc.xref.header.content-encoding.2">7.2</a>, <a href="#rfc.iref.h.7"><b>9.6</b></a>, <a href="#rfc.xref.header.content-encoding.3">11.3</a></li>
    4848                         <li>Content-Language&nbsp;&nbsp;<a href="#rfc.xref.header.content-language.1">7.2</a>, <a href="#rfc.iref.h.8"><b>9.7</b></a>, <a href="#rfc.xref.header.content-language.2">11.3</a></li>
    4849                         <li>Content-Location&nbsp;&nbsp;<a href="#rfc.xref.header.content-location.1">2.3.4</a>, <a href="#rfc.xref.header.content-location.2">7.2</a>, <a href="#rfc.iref.h.9"><b>9.8</b></a>, <a href="#rfc.xref.header.content-location.3">9.13</a>, <a href="#rfc.xref.header.content-location.4">11.3</a>, <a href="#rfc.xref.header.content-location.5">C</a></li>
     4872                        <li>Accept&nbsp;&nbsp;<a href="#rfc.xref.header.accept.1">3.2</a>, <a href="#rfc.xref.header.accept.2">5.5</a>, <a href="#rfc.xref.header.accept.3">8.1</a>, <a href="#rfc.iref.h.2"><b>9.1</b></a>, <a href="#rfc.xref.header.accept.4">10.3</a></li>
     4873                        <li>Accept-Charset&nbsp;&nbsp;<a href="#rfc.xref.header.accept-charset.1">3.2</a>, <a href="#rfc.xref.header.accept-charset.2">8.1</a>, <a href="#rfc.iref.h.3"><b>9.2</b></a>, <a href="#rfc.xref.header.accept-charset.3">10.3</a>, <a href="#rfc.xref.header.accept-charset.4">C</a></li>
     4874                        <li>Accept-Encoding&nbsp;&nbsp;<a href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.4</a>, <a href="#rfc.xref.header.accept-encoding.3">8.1</a>, <a href="#rfc.iref.h.4"><b>9.3</b></a>, <a href="#rfc.xref.header.accept-encoding.4">10.3</a>, <a href="#rfc.xref.header.accept-encoding.5">10.4</a></li>
     4875                        <li>Accept-Language&nbsp;&nbsp;<a href="#rfc.xref.header.accept-language.1">3.2</a>, <a href="#rfc.xref.header.accept-language.2">8.1</a>, <a href="#rfc.iref.h.5"><b>9.4</b></a>, <a href="#rfc.xref.header.accept-language.3">10.3</a></li>
     4876                        <li>Allow&nbsp;&nbsp;<a href="#rfc.xref.header.allow.1">2</a>, <a href="#rfc.xref.header.allow.2">3.3</a>, <a href="#rfc.iref.h.6"><b>9.5</b></a>, <a href="#rfc.xref.header.allow.3">10.3</a>, <a href="#rfc.xref.header.allow.4">C</a></li>
     4877                        <li>Content-Encoding&nbsp;&nbsp;<a href="#rfc.xref.header.content-encoding.1">5.4</a>, <a href="#rfc.xref.header.content-encoding.2">7.2</a>, <a href="#rfc.iref.h.7"><b>9.6</b></a>, <a href="#rfc.xref.header.content-encoding.3">10.3</a></li>
     4878                        <li>Content-Language&nbsp;&nbsp;<a href="#rfc.xref.header.content-language.1">7.2</a>, <a href="#rfc.iref.h.8"><b>9.7</b></a>, <a href="#rfc.xref.header.content-language.2">10.3</a></li>
     4879                        <li>Content-Location&nbsp;&nbsp;<a href="#rfc.xref.header.content-location.1">2.3.4</a>, <a href="#rfc.xref.header.content-location.2">7.2</a>, <a href="#rfc.iref.h.9"><b>9.8</b></a>, <a href="#rfc.xref.header.content-location.3">9.13</a>, <a href="#rfc.xref.header.content-location.4">10.3</a>, <a href="#rfc.xref.header.content-location.5">C</a></li>
    48504880                        <li>Content-Transfer-Encoding&nbsp;&nbsp;<a href="#rfc.iref.h.21">A.5</a>, <a href="#rfc.xref.no.content-transfer-encoding.1">C</a></li>
    4851                         <li>Content-Type&nbsp;&nbsp;<a href="#rfc.xref.header.content-type.1">3.1</a>, <a href="#rfc.xref.header.content-type.2">4</a>, <a href="#rfc.xref.header.content-type.3">5.5</a>, <a href="#rfc.xref.header.content-type.4">7.2</a>, <a href="#rfc.iref.h.10"><b>9.9</b></a>, <a href="#rfc.xref.header.content-type.5">11.3</a></li>
    4852                         <li>Date&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.h.11"><b>9.10</b></a>, <a href="#rfc.xref.header.date.2">11.3</a></li>
    4853                         <li>Expect&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.6.14</a>, <a href="#rfc.iref.h.12"><b>9.11</b></a>, <a href="#rfc.xref.header.expect.3">11.3</a>, <a href="#rfc.xref.header.expect.4">C</a></li>
    4854                         <li>From&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.h.13"><b>9.12</b></a>, <a href="#rfc.xref.header.from.2">11.3</a></li>
    4855                         <li>Location&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">2.3.4</a>, <a href="#rfc.xref.header.location.2">3.3</a>, <a href="#rfc.xref.header.location.3">4.5</a>, <a href="#rfc.iref.h.14"><b>9.13</b></a>, <a href="#rfc.xref.header.location.4">11.3</a>, <a href="#rfc.xref.header.location.5">C</a></li>
    4856                         <li>Max-Forwards&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">2.3.1</a>, <a href="#rfc.xref.header.max-forwards.2">2.3.7</a>, <a href="#rfc.xref.header.max-forwards.3">3.2</a>, <a href="#rfc.iref.h.15"><b>9.14</b></a>, <a href="#rfc.xref.header.max-forwards.4">11.3</a>, <a href="#rfc.xref.header.max-forwards.5">C</a></li>
    4857                         <li>MIME-Version&nbsp;&nbsp;<a href="#rfc.xref.mime-version.1">11.3</a>, <a href="#rfc.iref.h.20"><b>A.1</b></a></li>
    4858                         <li>Referer&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.h.16"><b>9.15</b></a>, <a href="#rfc.xref.header.referer.2">11.3</a>, <a href="#rfc.xref.header.referer.3">C</a></li>
    4859                         <li>Retry-After&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.7.4</a>, <a href="#rfc.iref.h.17"><b>9.16</b></a>, <a href="#rfc.xref.header.retry-after.3">11.3</a></li>
    4860                         <li>Server&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.h.18"><b>9.17</b></a>, <a href="#rfc.xref.header.server.2">11.3</a>, <a href="#rfc.xref.header.server.3">12.1</a>, <a href="#rfc.xref.header.server.4">C</a></li>
    4861                         <li>User-Agent&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.xref.header.user-agent.2">8.1</a>, <a href="#rfc.iref.h.19"><b>9.18</b></a>, <a href="#rfc.xref.header.user-agent.3">11.3</a>, <a href="#rfc.xref.header.user-agent.4">12.1</a></li>
     4881                        <li>Content-Type&nbsp;&nbsp;<a href="#rfc.xref.header.content-type.1">3.1</a>, <a href="#rfc.xref.header.content-type.2">4</a>, <a href="#rfc.xref.header.content-type.3">5.5</a>, <a href="#rfc.xref.header.content-type.4">7.2</a>, <a href="#rfc.iref.h.10"><b>9.9</b></a>, <a href="#rfc.xref.header.content-type.5">10.3</a></li>
     4882                        <li>Date&nbsp;&nbsp;<a href="#rfc.xref.header.date.1">3.3</a>, <a href="#rfc.iref.h.11"><b>9.10</b></a>, <a href="#rfc.xref.header.date.2">10.3</a></li>
     4883                        <li>Expect&nbsp;&nbsp;<a href="#rfc.xref.header.expect.1">3.2</a>, <a href="#rfc.xref.header.expect.2">4.6.14</a>, <a href="#rfc.iref.h.12"><b>9.11</b></a>, <a href="#rfc.xref.header.expect.3">10.3</a>, <a href="#rfc.xref.header.expect.4">C</a></li>
     4884                        <li>From&nbsp;&nbsp;<a href="#rfc.xref.header.from.1">3.2</a>, <a href="#rfc.iref.h.13"><b>9.12</b></a>, <a href="#rfc.xref.header.from.2">10.3</a></li>
     4885                        <li>Location&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">2.3.4</a>, <a href="#rfc.xref.header.location.2">3.3</a>, <a href="#rfc.xref.header.location.3">4.5</a>, <a href="#rfc.iref.h.14"><b>9.13</b></a>, <a href="#rfc.xref.header.location.4">10.3</a>, <a href="#rfc.xref.header.location.5">C</a></li>
     4886                        <li>Max-Forwards&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">2.3.1</a>, <a href="#rfc.xref.header.max-forwards.2">2.3.7</a>, <a href="#rfc.xref.header.max-forwards.3">3.2</a>, <a href="#rfc.iref.h.15"><b>9.14</b></a>, <a href="#rfc.xref.header.max-forwards.4">10.3</a>, <a href="#rfc.xref.header.max-forwards.5">C</a></li>
     4887                        <li>MIME-Version&nbsp;&nbsp;<a href="#rfc.xref.mime-version.1">10.3</a>, <a href="#rfc.iref.h.20"><b>A.1</b></a></li>
     4888                        <li>Referer&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.h.16"><b>9.15</b></a>, <a href="#rfc.xref.header.referer.2">10.3</a>, <a href="#rfc.xref.header.referer.3">C</a></li>
     4889                        <li>Retry-After&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.7.4</a>, <a href="#rfc.iref.h.17"><b>9.16</b></a>, <a href="#rfc.xref.header.retry-after.3">10.3</a></li>
     4890                        <li>Server&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.h.18"><b>9.17</b></a>, <a href="#rfc.xref.header.server.2">10.3</a>, <a href="#rfc.xref.header.server.3">11.1</a>, <a href="#rfc.xref.header.server.4">C</a></li>
     4891                        <li>User-Agent&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.xref.header.user-agent.2">8.1</a>, <a href="#rfc.iref.h.19"><b>9.18</b></a>, <a href="#rfc.xref.header.user-agent.3">10.3</a>, <a href="#rfc.xref.header.user-agent.4">11.1</a></li>
    48624892                     </ul>
    48634893                  </li>
    … …  
    48694899            </li>
    48704900            <li><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul>
    4871                   <li>Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">2.3.4</a>, <a href="#rfc.xref.header.location.2">3.3</a>, <a href="#rfc.xref.header.location.3">4.5</a>, <a href="#rfc.iref.l.1"><b>9.13</b></a>, <a href="#rfc.xref.header.location.4">11.3</a>, <a href="#rfc.xref.header.location.5">C</a></li>
     4901                  <li>Location header field&nbsp;&nbsp;<a href="#rfc.xref.header.location.1">2.3.4</a>, <a href="#rfc.xref.header.location.2">3.3</a>, <a href="#rfc.xref.header.location.3">4.5</a>, <a href="#rfc.iref.l.1"><b>9.13</b></a>, <a href="#rfc.xref.header.location.4">10.3</a>, <a href="#rfc.xref.header.location.5">C</a></li>
    48724902               </ul>
    48734903            </li>
    48744904            <li><a id="rfc.index.M" href="#rfc.index.M"><b>M</b></a><ul>
    4875                   <li>Max-Forwards header field&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">2.3.1</a>, <a href="#rfc.xref.header.max-forwards.2">2.3.7</a>, <a href="#rfc.xref.header.max-forwards.3">3.2</a>, <a href="#rfc.iref.m.9"><b>9.14</b></a>, <a href="#rfc.xref.header.max-forwards.4">11.3</a>, <a href="#rfc.xref.header.max-forwards.5">C</a></li>
     4905                  <li>Max-Forwards header field&nbsp;&nbsp;<a href="#rfc.xref.header.max-forwards.1">2.3.1</a>, <a href="#rfc.xref.header.max-forwards.2">2.3.7</a>, <a href="#rfc.xref.header.max-forwards.3">3.2</a>, <a href="#rfc.iref.m.9"><b>9.14</b></a>, <a href="#rfc.xref.header.max-forwards.4">10.3</a>, <a href="#rfc.xref.header.max-forwards.5">C</a></li>
    48764906                  <li>Methods&nbsp;&nbsp;
    48774907                     <ul>
    4878                         <li>CONNECT&nbsp;&nbsp;<a href="#rfc.iref.m.8"><b>2.3.8</b></a>, <a href="#rfc.xref.CONNECT.1">11.1</a>, <a href="#rfc.xref.CONNECT.2">C</a></li>
    4879                         <li>DELETE&nbsp;&nbsp;<a href="#rfc.iref.m.6"><b>2.3.6</b></a>, <a href="#rfc.xref.DELETE.1">11.1</a></li>
    4880                         <li>GET&nbsp;&nbsp;<a href="#rfc.iref.m.2"><b>2.3.2</b></a>, <a href="#rfc.xref.GET.1">11.1</a></li>
    4881                         <li>HEAD&nbsp;&nbsp;<a href="#rfc.iref.m.3"><b>2.3.3</b></a>, <a href="#rfc.xref.HEAD.1">11.1</a></li>
    4882                         <li>OPTIONS&nbsp;&nbsp;<a href="#rfc.iref.m.1"><b>2.3.1</b></a>, <a href="#rfc.xref.OPTIONS.1">9.14</a>, <a href="#rfc.xref.OPTIONS.2">11.1</a></li>
    4883                         <li>POST&nbsp;&nbsp;<a href="#rfc.iref.m.4"><b>2.3.4</b></a>, <a href="#rfc.xref.POST.1">11.1</a>, <a href="#rfc.xref.POST.2">C</a></li>
    4884                         <li>PUT&nbsp;&nbsp;<a href="#rfc.iref.m.5"><b>2.3.5</b></a>, <a href="#rfc.xref.PUT.1">11.1</a>, <a href="#rfc.xref.PUT.2">C</a></li>
    4885                         <li>TRACE&nbsp;&nbsp;<a href="#rfc.iref.m.7"><b>2.3.7</b></a>, <a href="#rfc.xref.TRACE.1">9.14</a>, <a href="#rfc.xref.TRACE.2">11.1</a>, <a href="#rfc.xref.TRACE.3">12.1</a></li>
     4908                        <li>CONNECT&nbsp;&nbsp;<a href="#rfc.iref.m.8"><b>2.3.8</b></a>, <a href="#rfc.xref.CONNECT.1">10.1</a>, <a href="#rfc.xref.CONNECT.2">C</a></li>
     4909                        <li>DELETE&nbsp;&nbsp;<a href="#rfc.iref.m.6"><b>2.3.6</b></a>, <a href="#rfc.xref.DELETE.1">10.1</a></li>
     4910                        <li>GET&nbsp;&nbsp;<a href="#rfc.iref.m.2"><b>2.3.2</b></a>, <a href="#rfc.xref.GET.1">10.1</a></li>
     4911                        <li>HEAD&nbsp;&nbsp;<a href="#rfc.iref.m.3"><b>2.3.3</b></a>, <a href="#rfc.xref.HEAD.1">10.1</a></li>
     4912                        <li>OPTIONS&nbsp;&nbsp;<a href="#rfc.iref.m.1"><b>2.3.1</b></a>, <a href="#rfc.xref.OPTIONS.1">9.14</a>, <a href="#rfc.xref.OPTIONS.2">10.1</a></li>
     4913                        <li>POST&nbsp;&nbsp;<a href="#rfc.iref.m.4"><b>2.3.4</b></a>, <a href="#rfc.xref.POST.1">10.1</a>, <a href="#rfc.xref.POST.2">C</a></li>
     4914                        <li>PUT&nbsp;&nbsp;<a href="#rfc.iref.m.5"><b>2.3.5</b></a>, <a href="#rfc.xref.PUT.1">10.1</a>, <a href="#rfc.xref.PUT.2">C</a></li>
     4915                        <li>TRACE&nbsp;&nbsp;<a href="#rfc.iref.m.7"><b>2.3.7</b></a>, <a href="#rfc.xref.TRACE.1">9.14</a>, <a href="#rfc.xref.TRACE.2">10.1</a>, <a href="#rfc.xref.TRACE.3">11.1</a></li>
    48864916                     </ul>
    48874917                  </li>
    4888                   <li>MIME-Version header field&nbsp;&nbsp;<a href="#rfc.xref.mime-version.1">11.3</a>, <a href="#rfc.iref.m.10"><b>A.1</b></a></li>
     4918                  <li>MIME-Version header field&nbsp;&nbsp;<a href="#rfc.xref.mime-version.1">10.3</a>, <a href="#rfc.iref.m.10"><b>A.1</b></a></li>
    48894919               </ul>
    48904920            </li>
    48914921            <li><a id="rfc.index.O" href="#rfc.index.O"><b>O</b></a><ul>
    4892                   <li>OPTIONS method&nbsp;&nbsp;<a href="#rfc.iref.o.1"><b>2.3.1</b></a>, <a href="#rfc.xref.OPTIONS.1">9.14</a>, <a href="#rfc.xref.OPTIONS.2">11.1</a></li>
     4922                  <li>OPTIONS method&nbsp;&nbsp;<a href="#rfc.iref.o.1"><b>2.3.1</b></a>, <a href="#rfc.xref.OPTIONS.1">9.14</a>, <a href="#rfc.xref.OPTIONS.2">10.1</a></li>
    48934923               </ul>
    48944924            </li>
    48954925            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
    4896                   <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1</a>, <a href="#rfc.xref.Part1.2">2</a>, <a href="#rfc.xref.Part1.3">2.2.1</a>, <a href="#rfc.xref.Part1.4">2.3.1</a>, <a href="#rfc.xref.Part1.5">2.3.7</a>, <a href="#rfc.xref.Part1.6">2.3.7</a>, <a href="#rfc.xref.Part1.7">2.3.8</a>, <a href="#rfc.xref.Part1.8">3</a>, <a href="#rfc.xref.Part1.9">3.1</a>, <a href="#rfc.xref.Part1.10">3.1</a>, <a href="#rfc.xref.Part1.11">3.1</a>, <a href="#rfc.xref.Part1.12">3.1</a>, <a href="#rfc.xref.Part1.13">3.1</a>, <a href="#rfc.xref.Part1.14">3.2</a>, <a href="#rfc.xref.Part1.15">3.2</a>, <a href="#rfc.xref.Part1.16">3.3</a>, <a href="#rfc.xref.Part1.17">4.3.1</a>, <a href="#rfc.xref.Part1.18">4.3.2</a>, <a href="#rfc.xref.Part1.19">4.4.4</a>, <a href="#rfc.xref.Part1.20">4.4.6</a>, <a href="#rfc.xref.Part1.21">4.6.15</a>, <a href="#rfc.xref.Part1.22">4.7.6</a>, <a href="#rfc.xref.Part1.23">5.4</a>, <a href="#rfc.xref.Part1.24">5.4</a>, <a href="#rfc.xref.Part1.25">5.4</a>, <a href="#rfc.xref.Part1.26">5.4.1</a>, <a href="#rfc.xref.Part1.27">5.4.1</a>, <a href="#rfc.xref.Part1.28">6.1</a>, <a href="#rfc.xref.Part1.29">6.2</a>, <a href="#rfc.xref.Part1.30">7</a>, <a href="#rfc.xref.Part1.31">7.1</a>, <a href="#rfc.xref.Part1.32">8.1</a>, <a href="#rfc.xref.Part1.33">9.1</a>, <a href="#rfc.xref.Part1.34">9.3</a>, <a href="#rfc.xref.Part1.35">9.8</a>, <a href="#rfc.xref.Part1.36">9.11</a>, <a href="#rfc.xref.Part1.37">9.17</a>, <a href="#rfc.xref.Part1.38">9.17</a>, <a href="#rfc.xref.Part1.39">9.18</a>, <a href="#rfc.xref.Part1.40">10</a>, <a href="#rfc.xref.Part1.41">10</a>, <a href="#rfc.xref.Part1.42">10</a>, <a href="#rfc.xref.Part1.43">10</a>, <a href="#rfc.xref.Part1.44">10</a>, <a href="#rfc.xref.Part1.45">10</a>, <a href="#rfc.xref.Part1.46">10</a>, <a href="#rfc.xref.Part1.47">10</a>, <a href="#rfc.xref.Part1.48">10</a>, <a href="#rfc.xref.Part1.49">10</a>, <a href="#rfc.xref.Part1.50">10</a>, <a href="#rfc.xref.Part1.51">10</a>, <a href="#rfc.xref.Part1.52">11.4</a>, <a href="#rfc.xref.Part1.53">11.4</a>, <a href="#rfc.xref.Part1.54">11.4</a>, <a href="#rfc.xref.Part1.55">13</a>, <a href="#Part1"><b>14.1</b></a>, <a href="#rfc.xref.Part1.56">C</a><ul>
    4897                         <li><em>Section 1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.40">10</a></li>
    4898                         <li><em>Section 2.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.19">4.4.4</a></li>
    4899                         <li><em>Section 2.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.22">4.7.6</a></li>
    4900                         <li><em>Section 2.8</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.44">10</a>, <a href="#rfc.xref.Part1.45">10</a>, <a href="#rfc.xref.Part1.46">10</a></li>
    4901                         <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.8">3</a>, <a href="#rfc.xref.Part1.11">3.1</a>, <a href="#rfc.xref.Part1.37">9.17</a>, <a href="#rfc.xref.Part1.39">9.18</a></li>
    4902                         <li><em>Section 3.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.41">10</a>, <a href="#rfc.xref.Part1.42">10</a>, <a href="#rfc.xref.Part1.43">10</a></li>
    4903                         <li><em>Section 3.2.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.10">3.1</a>, <a href="#rfc.xref.Part1.47">10</a>, <a href="#rfc.xref.Part1.49">10</a>, <a href="#rfc.xref.Part1.50">10</a>, <a href="#rfc.xref.Part1.51">10</a></li>
    4904                         <li><em>Section 3.2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.9">3.1</a></li>
    4905                         <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.3">2.2.1</a>, <a href="#rfc.xref.Part1.20">4.4.6</a>, <a href="#rfc.xref.Part1.29">6.2</a>, <a href="#rfc.xref.Part1.30">7</a></li>
    4906                         <li><em>Section 3.3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.28">6.1</a></li>
    4907                         <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.26">5.4.1</a></li>
    4908                         <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.13">3.1</a></li>
    4909                         <li><em>Section 4.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.23">5.4</a>, <a href="#rfc.xref.Part1.52">11.4</a></li>
    4910                         <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.27">5.4.1</a></li>
    4911                         <li><em>Section 4.2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.24">5.4</a>, <a href="#rfc.xref.Part1.53">11.4</a></li>
    4912                         <li><em>Section 4.2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.25">5.4</a>, <a href="#rfc.xref.Part1.54">11.4</a></li>
    4913                         <li><em>Section 4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.15">3.2</a></li>
    4914                         <li><em>Section 4.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.32">8.1</a>, <a href="#rfc.xref.Part1.33">9.1</a>, <a href="#rfc.xref.Part1.34">9.3</a>, <a href="#rfc.xref.Part1.48">10</a></li>
    4915                         <li><em>Section 5.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.4">2.3.1</a>, <a href="#rfc.xref.Part1.7">2.3.8</a></li>
    4916                         <li><em>Section 5.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.14">3.2</a></li>
    4917                         <li><em>Section 5.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.2">2</a>, <a href="#rfc.xref.Part1.16">3.3</a>, <a href="#rfc.xref.Part1.31">7.1</a>, <a href="#rfc.xref.Part1.35">9.8</a></li>
    4918                         <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.12">3.1</a></li>
    4919                         <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.5">2.3.7</a>, <a href="#rfc.xref.Part1.38">9.17</a>, <a href="#rfc.xref.Part1.56">C</a></li>
    4920                         <li><em>Section 6.4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.17">4.3.1</a>, <a href="#rfc.xref.Part1.36">9.11</a></li>
    4921                         <li><em>Section 6.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.18">4.3.2</a>, <a href="#rfc.xref.Part1.21">4.6.15</a></li>
    4922                         <li><em>Section 7.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.6">2.3.7</a></li>
    4923                         <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.55">13</a></li>
     4926                  <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1</a>, <a href="#rfc.xref.Part1.2">1.1</a>, <a href="#rfc.xref.Part1.3">1.2</a>, <a href="#rfc.xref.Part1.4">1.2.1</a>, <a href="#rfc.xref.Part1.5">1.2.1</a>, <a href="#rfc.xref.Part1.6">1.2.1</a>, <a href="#rfc.xref.Part1.7">1.2.1</a>, <a href="#rfc.xref.Part1.8">1.2.1</a>, <a href="#rfc.xref.Part1.9">1.2.1</a>, <a href="#rfc.xref.Part1.10">1.2.1</a>, <a href="#rfc.xref.Part1.11">1.2.2</a>, <a href="#rfc.xref.Part1.12">1.2.2</a>, <a href="#rfc.xref.Part1.13">1.2.2</a>, <a href="#rfc.xref.Part1.14">1.2.2</a>, <a href="#rfc.xref.Part1.15">1.2.2</a>, <a href="#rfc.xref.Part1.16">2</a>, <a href="#rfc.xref.Part1.17">2.2.1</a>, <a href="#rfc.xref.Part1.18">2.3.1</a>, <a href="#rfc.xref.Part1.19">2.3.7</a>, <a href="#rfc.xref.Part1.20">2.3.7</a>, <a href="#rfc.xref.Part1.21">2.3.8</a>, <a href="#rfc.xref.Part1.22">3</a>, <a href="#rfc.xref.Part1.23">3.1</a>, <a href="#rfc.xref.Part1.24">3.1</a>, <a href="#rfc.xref.Part1.25">3.1</a>, <a href="#rfc.xref.Part1.26">3.1</a>, <a href="#rfc.xref.Part1.27">3.1</a>, <a href="#rfc.xref.Part1.28">3.2</a>, <a href="#rfc.xref.Part1.29">3.2</a>, <a href="#rfc.xref.Part1.30">3.3</a>, <a href="#rfc.xref.Part1.31">4.3.1</a>, <a href="#rfc.xref.Part1.32">4.3.2</a>, <a href="#rfc.xref.Part1.33">4.4.4</a>, <a href="#rfc.xref.Part1.34">4.4.6</a>, <a href="#rfc.xref.Part1.35">4.6.15</a>, <a href="#rfc.xref.Part1.36">4.7.6</a>, <a href="#rfc.xref.Part1.37">5.4</a>, <a href="#rfc.xref.Part1.38">5.4</a>, <a href="#rfc.xref.Part1.39">5.4</a>, <a href="#rfc.xref.Part1.40">5.4.1</a>, <a href="#rfc.xref.Part1.41">5.4.1</a>, <a href="#rfc.xref.Part1.42">6.1</a>, <a href="#rfc.xref.Part1.43">6.2</a>, <a href="#rfc.xref.Part1.44">7</a>, <a href="#rfc.xref.Part1.45">7.1</a>, <a href="#rfc.xref.Part1.46">8.1</a>, <a href="#rfc.xref.Part1.47">9.1</a>, <a href="#rfc.xref.Part1.48">9.3</a>, <a href="#rfc.xref.Part1.49">9.8</a>, <a href="#rfc.xref.Part1.50">9.11</a>, <a href="#rfc.xref.Part1.51">9.17</a>, <a href="#rfc.xref.Part1.52">9.17</a>, <a href="#rfc.xref.Part1.53">9.18</a>, <a href="#rfc.xref.Part1.54">10.4</a>, <a href="#rfc.xref.Part1.55">10.4</a>, <a href="#rfc.xref.Part1.56">10.4</a>, <a href="#rfc.xref.Part1.57">12</a>, <a href="#Part1"><b>13.1</b></a>, <a href="#rfc.xref.Part1.58">C</a><ul>
     4927                        <li><em>Section 1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.3">1.2</a></li>
     4928                        <li><em>Section 2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.2">1.1</a></li>
     4929                        <li><em>Section 2.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.33">4.4.4</a></li>
     4930                        <li><em>Section 2.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.36">4.7.6</a></li>
     4931                        <li><em>Section 2.8</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.11">1.2.2</a>, <a href="#rfc.xref.Part1.13">1.2.2</a>, <a href="#rfc.xref.Part1.15">1.2.2</a></li>
     4932                        <li><em>Section 3.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.5">1.2.1</a>, <a href="#rfc.xref.Part1.6">1.2.1</a>, <a href="#rfc.xref.Part1.7">1.2.1</a></li>
     4933                        <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.22">3</a>, <a href="#rfc.xref.Part1.25">3.1</a>, <a href="#rfc.xref.Part1.51">9.17</a>, <a href="#rfc.xref.Part1.53">9.18</a></li>
     4934                        <li><em>Section 3.2.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.8">1.2.1</a>, <a href="#rfc.xref.Part1.9">1.2.1</a>, <a href="#rfc.xref.Part1.10">1.2.1</a>, <a href="#rfc.xref.Part1.12">1.2.2</a>, <a href="#rfc.xref.Part1.24">3.1</a></li>
     4935                        <li><em>Section 3.2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.23">3.1</a></li>
     4936                        <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.17">2.2.1</a>, <a href="#rfc.xref.Part1.34">4.4.6</a>, <a href="#rfc.xref.Part1.43">6.2</a>, <a href="#rfc.xref.Part1.44">7</a></li>
     4937                        <li><em>Section 3.3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.42">6.1</a></li>
     4938                        <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.40">5.4.1</a></li>
     4939                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.27">3.1</a></li>
     4940                        <li><em>Section 4.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.37">5.4</a>, <a href="#rfc.xref.Part1.54">10.4</a></li>
     4941                        <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.41">5.4.1</a></li>
     4942                        <li><em>Section 4.2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.38">5.4</a>, <a href="#rfc.xref.Part1.55">10.4</a></li>
     4943                        <li><em>Section 4.2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.39">5.4</a>, <a href="#rfc.xref.Part1.56">10.4</a></li>
     4944                        <li><em>Section 4.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.14">1.2.2</a>, <a href="#rfc.xref.Part1.46">8.1</a>, <a href="#rfc.xref.Part1.47">9.1</a>, <a href="#rfc.xref.Part1.48">9.3</a></li>
     4945                        <li><em>Section 4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.29">3.2</a></li>
     4946                        <li><em>Section 5.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.18">2.3.1</a>, <a href="#rfc.xref.Part1.21">2.3.8</a></li>
     4947                        <li><em>Section 5.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.28">3.2</a></li>
     4948                        <li><em>Section 5.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.16">2</a>, <a href="#rfc.xref.Part1.30">3.3</a>, <a href="#rfc.xref.Part1.45">7.1</a>, <a href="#rfc.xref.Part1.49">9.8</a></li>
     4949                        <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.26">3.1</a></li>
     4950                        <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.19">2.3.7</a>, <a href="#rfc.xref.Part1.52">9.17</a>, <a href="#rfc.xref.Part1.58">C</a></li>
     4951                        <li><em>Section 6.4.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.31">4.3.1</a>, <a href="#rfc.xref.Part1.50">9.11</a></li>
     4952                        <li><em>Section 6.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.32">4.3.2</a>, <a href="#rfc.xref.Part1.35">4.6.15</a></li>
     4953                        <li><em>Section 7.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.20">2.3.7</a></li>
     4954                        <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.57">12</a></li>
    49244955                     </ul>
    49254956                  </li>
    4926                   <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">2.3.2</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">3.2</a>, <a href="#rfc.xref.Part4.5">3.2</a>, <a href="#rfc.xref.Part4.6">3.3</a>, <a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.8">4.1</a>, <a href="#rfc.xref.Part4.9">4.1</a>, <a href="#rfc.xref.Part4.10">4.4.2</a>, <a href="#rfc.xref.Part4.11">4.5</a>, <a href="#rfc.xref.Part4.12">7.2</a>, <a href="#rfc.xref.Part4.13">7.2</a>, <a href="#Part4"><b>14.1</b></a>, <a href="#rfc.xref.Part4.14">E.2</a><ul>
     4957                  <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">2.3.2</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">3.2</a>, <a href="#rfc.xref.Part4.5">3.2</a>, <a href="#rfc.xref.Part4.6">3.3</a>, <a href="#rfc.xref.Part4.7">4.1</a>, <a href="#rfc.xref.Part4.8">4.1</a>, <a href="#rfc.xref.Part4.9">4.1</a>, <a href="#rfc.xref.Part4.10">4.4.2</a>, <a href="#rfc.xref.Part4.11">4.5</a>, <a href="#rfc.xref.Part4.12">7.2</a>, <a href="#rfc.xref.Part4.13">7.2</a>, <a href="#Part4"><b>13.1</b></a>, <a href="#rfc.xref.Part4.14">E.2</a><ul>
    49274958                        <li><em>Section 2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.13">7.2</a></li>
    49284959                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.6">3.3</a>, <a href="#rfc.xref.Part4.10">4.4.2</a>, <a href="#rfc.xref.Part4.12">7.2</a></li>
    … …  
    49364967                     </ul>
    49374968                  </li>
    4938                   <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">2.3.2</a>, <a href="#rfc.xref.Part5.2">2.3.2</a>, <a href="#rfc.xref.Part5.3">2.3.5</a>, <a href="#rfc.xref.Part5.4">3.2</a>, <a href="#rfc.xref.Part5.5">3.2</a>, <a href="#rfc.xref.Part5.6">3.3</a>, <a href="#rfc.xref.Part5.7">4.1</a>, <a href="#rfc.xref.Part5.8">4.1</a>, <a href="#rfc.xref.Part5.9">4.1</a>, <a href="#rfc.xref.Part5.10">6.1</a>, <a href="#Part5"><b>14.1</b></a><ul>
     4969                  <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">2.3.2</a>, <a href="#rfc.xref.Part5.2">2.3.2</a>, <a href="#rfc.xref.Part5.3">2.3.5</a>, <a href="#rfc.xref.Part5.4">3.2</a>, <a href="#rfc.xref.Part5.5">3.2</a>, <a href="#rfc.xref.Part5.6">3.3</a>, <a href="#rfc.xref.Part5.7">4.1</a>, <a href="#rfc.xref.Part5.8">4.1</a>, <a href="#rfc.xref.Part5.9">4.1</a>, <a href="#rfc.xref.Part5.10">6.1</a>, <a href="#Part5"><b>13.1</b></a><ul>
    49394970                        <li><em>Section 3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.7">4.1</a></li>
    49404971                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.8">4.1</a></li>
    … …  
    49464977                     </ul>
    49474978                  </li>
    4948                   <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">2.2.1</a>, <a href="#rfc.xref.Part6.2">2.3.2</a>, <a href="#rfc.xref.Part6.3">2.3.3</a>, <a href="#rfc.xref.Part6.4">2.3.4</a>, <a href="#rfc.xref.Part6.5">2.3.5</a>, <a href="#rfc.xref.Part6.6">2.3.6</a>, <a href="#rfc.xref.Part6.7">3.1</a>, <a href="#rfc.xref.Part6.8">3.3</a>, <a href="#rfc.xref.Part6.9">3.3</a>, <a href="#rfc.xref.Part6.10">4.2.1</a>, <a href="#rfc.xref.Part6.11">4.4.1</a>, <a href="#rfc.xref.Part6.12">4.4.4</a>, <a href="#rfc.xref.Part6.13">4.4.4</a>, <a href="#rfc.xref.Part6.14">4.4.4</a>, <a href="#rfc.xref.Part6.15">4.5.1</a>, <a href="#rfc.xref.Part6.16">4.5.2</a>, <a href="#rfc.xref.Part6.17">4.6.9</a>, <a href="#rfc.xref.Part6.18">7.2</a>, <a href="#rfc.xref.Part6.19">8.1</a>, <a href="#Part6"><b>14.1</b></a><ul>
     4979                  <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">2.2.1</a>, <a href="#rfc.xref.Part6.2">2.3.2</a>, <a href="#rfc.xref.Part6.3">2.3.3</a>, <a href="#rfc.xref.Part6.4">2.3.4</a>, <a href="#rfc.xref.Part6.5">2.3.5</a>, <a href="#rfc.xref.Part6.6">2.3.6</a>, <a href="#rfc.xref.Part6.7">3.1</a>, <a href="#rfc.xref.Part6.8">3.3</a>, <a href="#rfc.xref.Part6.9">3.3</a>, <a href="#rfc.xref.Part6.10">4.2.1</a>, <a href="#rfc.xref.Part6.11">4.4.1</a>, <a href="#rfc.xref.Part6.12">4.4.4</a>, <a href="#rfc.xref.Part6.13">4.4.4</a>, <a href="#rfc.xref.Part6.14">4.4.4</a>, <a href="#rfc.xref.Part6.15">4.5.1</a>, <a href="#rfc.xref.Part6.16">4.5.2</a>, <a href="#rfc.xref.Part6.17">4.6.9</a>, <a href="#rfc.xref.Part6.18">7.2</a>, <a href="#rfc.xref.Part6.19">8.1</a>, <a href="#Part6"><b>13.1</b></a><ul>
    49494980                        <li><em>Section 4.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.4">2.3.4</a></li>
    49504981                        <li><em>Section 4.1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.11">4.4.1</a>, <a href="#rfc.xref.Part6.14">4.4.4</a>, <a href="#rfc.xref.Part6.15">4.5.1</a>, <a href="#rfc.xref.Part6.16">4.5.2</a>, <a href="#rfc.xref.Part6.17">4.6.9</a></li>
    … …  
    49584989                     </ul>
    49594990                  </li>
    4960                   <li><em>Part7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.1">3.2</a>, <a href="#rfc.xref.Part7.2">3.2</a>, <a href="#rfc.xref.Part7.3">3.3</a>, <a href="#rfc.xref.Part7.4">3.3</a>, <a href="#rfc.xref.Part7.5">4.1</a>, <a href="#rfc.xref.Part7.6">4.1</a>, <a href="#rfc.xref.Part7.7">4.1</a>, <a href="#Part7"><b>14.1</b></a><ul>
     4991                  <li><em>Part7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.1">3.2</a>, <a href="#rfc.xref.Part7.2">3.2</a>, <a href="#rfc.xref.Part7.3">3.3</a>, <a href="#rfc.xref.Part7.4">3.3</a>, <a href="#rfc.xref.Part7.5">4.1</a>, <a href="#rfc.xref.Part7.6">4.1</a>, <a href="#rfc.xref.Part7.7">4.1</a>, <a href="#Part7"><b>13.1</b></a><ul>
    49614992                        <li><em>Section 3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.5">4.1</a></li>
    49624993                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part7.6">4.1</a></li>
    … …  
    49695000                  </li>
    49705001                  <li>payload&nbsp;&nbsp;<a href="#rfc.iref.p.3">6</a></li>
    4971                   <li>POST method&nbsp;&nbsp;<a href="#rfc.iref.p.1"><b>2.3.4</b></a>, <a href="#rfc.xref.POST.1">11.1</a>, <a href="#rfc.xref.POST.2">C</a></li>
    4972                   <li>PUT method&nbsp;&nbsp;<a href="#rfc.iref.p.2"><b>2.3.5</b></a>, <a href="#rfc.xref.PUT.1">11.1</a>, <a href="#rfc.xref.PUT.2">C</a></li>
     5002                  <li>POST method&nbsp;&nbsp;<a href="#rfc.iref.p.1"><b>2.3.4</b></a>, <a href="#rfc.xref.POST.1">10.1</a>, <a href="#rfc.xref.POST.2">C</a></li>
     5003                  <li>PUT method&nbsp;&nbsp;<a href="#rfc.iref.p.2"><b>2.3.5</b></a>, <a href="#rfc.xref.PUT.1">10.1</a>, <a href="#rfc.xref.PUT.2">C</a></li>
    49735004               </ul>
    49745005            </li>
    49755006            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
    4976                   <li>Referer header field&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.r.2"><b>9.15</b></a>, <a href="#rfc.xref.header.referer.2">11.3</a>, <a href="#rfc.xref.header.referer.3">C</a></li>
     5007                  <li>Referer header field&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.r.2"><b>9.15</b></a>, <a href="#rfc.xref.header.referer.2">10.3</a>, <a href="#rfc.xref.header.referer.3">C</a></li>
    49775008                  <li>representation&nbsp;&nbsp;<a href="#rfc.iref.r.1">7</a></li>
    4978                   <li>Retry-After header field&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.7.4</a>, <a href="#rfc.iref.r.3"><b>9.16</b></a>, <a href="#rfc.xref.header.retry-after.3">11.3</a></li>
    4979                   <li><em>RFC1123</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.1">5.1</a>, <a href="#rfc.xref.RFC1123.2">5.1</a>, <a href="#RFC1123"><b>14.2</b></a><ul>
     5009                  <li>Retry-After header field&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">4.7.4</a>, <a href="#rfc.iref.r.3"><b>9.16</b></a>, <a href="#rfc.xref.header.retry-after.3">10.3</a></li>
     5010                  <li><em>RFC1123</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.1">5.1</a>, <a href="#rfc.xref.RFC1123.2">5.1</a>, <a href="#RFC1123"><b>13.2</b></a><ul>
    49805011                        <li><em>Section 5.2.14</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1123.2">5.1</a></li>
    49815012                     </ul>
    49825013                  </li>
    4983                   <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">4.5</a>, <a href="#RFC1945"><b>14.2</b></a>, <a href="#rfc.xref.RFC1945.2">B</a><ul>
     5014                  <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">4.5</a>, <a href="#RFC1945"><b>13.2</b></a>, <a href="#rfc.xref.RFC1945.2">B</a><ul>
    49845015                        <li><em>Section 9.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">4.5</a></li>
    49855016                     </ul>
    49865017                  </li>
    4987                   <li><em>RFC1950</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1950.1">11.4</a>, <a href="#RFC1950"><b>14.1</b></a></li>
    4988                   <li><em>RFC1951</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1951.1">11.4</a>, <a href="#RFC1951"><b>14.1</b></a></li>
    4989                   <li><em>RFC1952</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1952.1">11.4</a>, <a href="#RFC1952"><b>14.1</b></a></li>
    4990                   <li><em>RFC2045</em>&nbsp;&nbsp;<a href="#RFC2045"><b>14.1</b></a>, <a href="#rfc.xref.RFC2045.1">A</a>, <a href="#rfc.xref.RFC2045.2">A.1</a></li>
    4991                   <li><em>RFC2046</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2046.1">5.5</a>, <a href="#rfc.xref.RFC2046.2">5.5.2</a>, <a href="#rfc.xref.RFC2046.3">7.3</a>, <a href="#RFC2046"><b>14.1</b></a>, <a href="#rfc.xref.RFC2046.4">A.2</a><ul>
     5018                  <li><em>RFC1950</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1950.1">10.4</a>, <a href="#RFC1950"><b>13.1</b></a></li>
     5019                  <li><em>RFC1951</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1951.1">10.4</a>, <a href="#RFC1951"><b>13.1</b></a></li>
     5020                  <li><em>RFC1952</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1952.1">10.4</a>, <a href="#RFC1952"><b>13.1</b></a></li>
     5021                  <li><em>RFC2045</em>&nbsp;&nbsp;<a href="#RFC2045"><b>13.1</b></a>, <a href="#rfc.xref.RFC2045.1">A</a>, <a href="#rfc.xref.RFC2045.2">A.1</a></li>
     5022                  <li><em>RFC2046</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2046.1">5.5</a>, <a href="#rfc.xref.RFC2046.2">5.5.2</a>, <a href="#rfc.xref.RFC2046.3">7.3</a>, <a href="#RFC2046"><b>13.1</b></a>, <a href="#rfc.xref.RFC2046.4">A.2</a><ul>
    49925023                        <li><em>Section 4.5.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2046.3">7.3</a></li>
    49935024                        <li><em>Section 5.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2046.2">5.5.2</a></li>
    49945025                     </ul>
    49955026                  </li>
    4996                   <li><em>RFC2049</em>&nbsp;&nbsp;<a href="#RFC2049"><b>14.2</b></a>, <a href="#rfc.xref.RFC2049.1">A.2</a><ul>
     5027                  <li><em>RFC2049</em>&nbsp;&nbsp;<a href="#RFC2049"><b>13.2</b></a>, <a href="#rfc.xref.RFC2049.1">A.2</a><ul>
    49975028                        <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2049.1">A.2</a></li>
    49985029                     </ul>
    49995030                  </li>
    5000                   <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">4.5</a>, <a href="#rfc.xref.RFC2068.2">4.5</a>, <a href="#RFC2068"><b>14.2</b></a>, <a href="#rfc.xref.RFC2068.3">B</a><ul>
     5031                  <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">4.5</a>, <a href="#rfc.xref.RFC2068.2">4.5</a>, <a href="#RFC2068"><b>13.2</b></a>, <a href="#rfc.xref.RFC2068.3">B</a><ul>
    50015032                        <li><em>Section 10.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">4.5</a></li>
    50025033                        <li><em>Section 10.3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">4.5</a></li>
    50035034                     </ul>
    50045035                  </li>
    5005                   <li><em>RFC2076</em>&nbsp;&nbsp;<a href="#RFC2076"><b>14.2</b></a>, <a href="#rfc.xref.RFC2076.1">B</a></li>
    5006                   <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">10</a>, <a href="#RFC2119"><b>14.1</b></a></li>
    5007                   <li><em>RFC2277</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2277.1">5.3</a>, <a href="#RFC2277"><b>14.2</b></a></li>
    5008                   <li><em>RFC2295</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2295.1">8</a>, <a href="#RFC2295"><b>14.2</b></a></li>
    5009                   <li><em>RFC2388</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2388.1">5.5.2</a>, <a href="#RFC2388"><b>14.2</b></a></li>
    5010                   <li><em>RFC2557</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2557.1">9.8</a>, <a href="#RFC2557"><b>14.2</b></a>, <a href="#rfc.xref.RFC2557.2">A.6</a><ul>
     5036                  <li><em>RFC2076</em>&nbsp;&nbsp;<a href="#RFC2076"><b>13.2</b></a>, <a href="#rfc.xref.RFC2076.1">B</a></li>
     5037                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>13.1</b></a></li>
     5038                  <li><em>RFC2277</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2277.1">5.3</a>, <a href="#RFC2277"><b>13.2</b></a></li>
     5039                  <li><em>RFC2295</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2295.1">8</a>, <a href="#RFC2295"><b>13.2</b></a></li>
     5040                  <li><em>RFC2388</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2388.1">5.5.2</a>, <a href="#RFC2388"><b>13.2</b></a></li>
     5041                  <li><em>RFC2557</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2557.1">9.8</a>, <a href="#RFC2557"><b>13.2</b></a>, <a href="#rfc.xref.RFC2557.2">A.6</a><ul>
    50115042                        <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2557.1">9.8</a></li>
    50125043                     </ul>
    50135044                  </li>
    5014                   <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">4.5</a>, <a href="#rfc.xref.RFC2616.3">9.4</a>, <a href="#RFC2616"><b>14.2</b></a>, <a href="#rfc.xref.RFC2616.4">E.1</a><ul>
     5045                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">4.5</a>, <a href="#rfc.xref.RFC2616.3">9.4</a>, <a href="#RFC2616"><b>13.2</b></a>, <a href="#rfc.xref.RFC2616.4">E.1</a><ul>
    50155046                        <li><em>Section 10.3.8</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.2">4.5</a></li>
    50165047                        <li><em>Section 14.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.3">9.4</a></li>
    50175048                     </ul>
    50185049                  </li>
    5019                   <li><em>RFC2817</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">11.2</a>, <a href="#RFC2817"><b>14.2</b></a>, <a href="#rfc.xref.RFC2817.2">C</a>, <a href="#rfc.xref.RFC2817.3">C</a>, <a href="#rfc.xref.RFC2817.4">C</a><ul>
    5020                         <li><em>Section 7.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">11.2</a>, <a href="#rfc.xref.RFC2817.3">C</a></li>
     5050                  <li><em>RFC2817</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">10.2</a>, <a href="#RFC2817"><b>13.2</b></a>, <a href="#rfc.xref.RFC2817.2">C</a>, <a href="#rfc.xref.RFC2817.3">C</a>, <a href="#rfc.xref.RFC2817.4">C</a><ul>
     5051                        <li><em>Section 7.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2817.1">10.2</a>, <a href="#rfc.xref.RFC2817.3">C</a></li>
    50215052                     </ul>
    50225053                  </li>
    5023                   <li><em>RFC3629</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3629.1">5.3</a>, <a href="#RFC3629"><b>14.2</b></a></li>
    5024                   <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">3.1</a>, <a href="#rfc.xref.RFC3864.2">3.1</a>, <a href="#rfc.xref.RFC3864.3">11.3</a>, <a href="#RFC3864"><b>14.2</b></a><ul>
     5054                  <li><em>RFC3629</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3629.1">5.3</a>, <a href="#RFC3629"><b>13.2</b></a></li>
     5055                  <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">3.1</a>, <a href="#rfc.xref.RFC3864.2">3.1</a>, <a href="#rfc.xref.RFC3864.3">10.3</a>, <a href="#RFC3864"><b>13.2</b></a><ul>
    50255056                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.2">3.1</a></li>
    50265057                     </ul>
    50275058                  </li>
    5028                   <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">9.13</a>, <a href="#rfc.xref.RFC3986.2">9.13</a>, <a href="#RFC3986"><b>14.1</b></a><ul>
     5059                  <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">9.13</a>, <a href="#rfc.xref.RFC3986.2">9.13</a>, <a href="#RFC3986"><b>13.1</b></a><ul>
    50295060                        <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">9.13</a></li>
    50305061                        <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.2">9.13</a></li>
    50315062                     </ul>
    50325063                  </li>
    5033                   <li><em>RFC4288</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4288.1">5.5</a>, <a href="#RFC4288"><b>14.2</b></a></li>
    5034                   <li><em>RFC4647</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4647.1">9.4</a>, <a href="#rfc.xref.RFC4647.2">9.4</a>, <a href="#rfc.xref.RFC4647.3">9.4</a>, <a href="#rfc.xref.RFC4647.4">9.4</a>, <a href="#RFC4647"><b>14.1</b></a><ul>
     5064                  <li><em>RFC4288</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4288.1">5.5</a>, <a href="#RFC4288"><b>13.2</b></a></li>
     5065                  <li><em>RFC4647</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4647.1">9.4</a>, <a href="#rfc.xref.RFC4647.2">9.4</a>, <a href="#rfc.xref.RFC4647.3">9.4</a>, <a href="#rfc.xref.RFC4647.4">9.4</a>, <a href="#RFC4647"><b>13.1</b></a><ul>
    50355066                        <li><em>Section 2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4647.1">9.4</a></li>
    50365067                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC4647.2">9.4</a></li>
    … …  
    50395070                     </ul>
    50405071                  </li>
    5041                   <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a>, <a href="#rfc.xref.RFC5226.3">5.4.1</a>, <a href="#RFC5226"><b>14.2</b></a><ul>
     5072                  <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a>, <a href="#rfc.xref.RFC5226.3">5.4.1</a>, <a href="#RFC5226"><b>13.2</b></a><ul>
    50425073                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">2.2</a>, <a href="#rfc.xref.RFC5226.2">4.2</a>, <a href="#rfc.xref.RFC5226.3">5.4.1</a></li>
    50435074                     </ul>
    50445075                  </li>
    5045                   <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">3.1</a>, <a href="#rfc.xref.RFC5234.2">10</a>, <a href="#rfc.xref.RFC5234.3">10</a>, <a href="#RFC5234"><b>14.1</b></a><ul>
    5046                         <li><em>Appendix B.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.3">10</a></li>
     5076                  <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">1.2</a>, <a href="#rfc.xref.RFC5234.2">1.2</a>, <a href="#rfc.xref.RFC5234.3">3.1</a>, <a href="#RFC5234"><b>13.1</b></a><ul>
     5077                        <li><em>Appendix B.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.2">1.2</a></li>
    50475078                     </ul>
    50485079                  </li>
    5049                   <li><em>RFC5322</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">5.1</a>, <a href="#rfc.xref.RFC5322.2">9.10</a>, <a href="#rfc.xref.RFC5322.3">9.12</a>, <a href="#rfc.xref.RFC5322.4">9.12</a>, <a href="#RFC5322"><b>14.2</b></a>, <a href="#rfc.xref.RFC5322.5">A</a><ul>
     5080                  <li><em>RFC5322</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">5.1</a>, <a href="#rfc.xref.RFC5322.2">9.10</a>, <a href="#rfc.xref.RFC5322.3">9.12</a>, <a href="#rfc.xref.RFC5322.4">9.12</a>, <a href="#RFC5322"><b>13.2</b></a>, <a href="#rfc.xref.RFC5322.5">A</a><ul>
    50505081                        <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.1">5.1</a></li>
    50515082                        <li><em>Section 3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5322.3">9.12</a>, <a href="#rfc.xref.RFC5322.4">9.12</a></li>
    … …  
    50535084                     </ul>
    50545085                  </li>
    5055                   <li><em>RFC5646</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5646.1">5.6</a>, <a href="#rfc.xref.RFC5646.2">5.6</a>, <a href="#rfc.xref.RFC5646.3">5.6</a>, <a href="#RFC5646"><b>14.1</b></a><ul>
     5086                  <li><em>RFC5646</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5646.1">5.6</a>, <a href="#rfc.xref.RFC5646.2">5.6</a>, <a href="#rfc.xref.RFC5646.3">5.6</a>, <a href="#RFC5646"><b>13.1</b></a><ul>
    50565087                        <li><em>Section 2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5646.2">5.6</a></li>
    50575088                     </ul>
    50585089                  </li>
    5059                   <li><em>RFC5789</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5789.1">2.3.5</a>, <a href="#RFC5789"><b>14.2</b></a></li>
    5060                   <li><em>RFC5987</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5987.1">3.1</a>, <a href="#RFC5987"><b>14.2</b></a></li>
    5061                   <li><em>RFC6151</em>&nbsp;&nbsp;<a href="#RFC6151"><b>14.2</b></a>, <a href="#rfc.xref.RFC6151.1">C</a></li>
    5062                   <li><em>RFC6266</em>&nbsp;&nbsp;<a href="#RFC6266"><b>14.2</b></a>, <a href="#rfc.xref.RFC6266.1">B</a>, <a href="#rfc.xref.RFC6266.2">C</a></li>
     5090                  <li><em>RFC5789</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5789.1">2.3.5</a>, <a href="#RFC5789"><b>13.2</b></a></li>
     5091                  <li><em>RFC5987</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5987.1">3.1</a>, <a href="#RFC5987"><b>13.2</b></a></li>
     5092                  <li><em>RFC6151</em>&nbsp;&nbsp;<a href="#RFC6151"><b>13.2</b></a>, <a href="#rfc.xref.RFC6151.1">C</a></li>
     5093                  <li><em>RFC6266</em>&nbsp;&nbsp;<a href="#RFC6266"><b>13.2</b></a>, <a href="#rfc.xref.RFC6266.1">B</a>, <a href="#rfc.xref.RFC6266.2">C</a></li>
    50635094               </ul>
    50645095            </li>
    … …  
    50665097                  <li>Safe Methods&nbsp;&nbsp;<a href="#rfc.iref.s.1"><b>2.1.1</b></a></li>
    50675098                  <li>selected representation&nbsp;&nbsp;<a href="#rfc.iref.s.43"><b>7.2</b></a></li>
    5068                   <li>Server header field&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.s.44"><b>9.17</b></a>, <a href="#rfc.xref.header.server.2">11.3</a>, <a href="#rfc.xref.header.server.3">12.1</a>, <a href="#rfc.xref.header.server.4">C</a></li>
     5099                  <li>Server header field&nbsp;&nbsp;<a href="#rfc.xref.header.server.1">3.3</a>, <a href="#rfc.iref.s.44"><b>9.17</b></a>, <a href="#rfc.xref.header.server.2">10.3</a>, <a href="#rfc.xref.header.server.3">11.1</a>, <a href="#rfc.xref.header.server.4">C</a></li>
    50695100                  <li>Status Codes&nbsp;&nbsp;
    50705101                     <ul>
    5071                         <li>100 Continue&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.s.3"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">11.2</a></li>
    5072                         <li>101 Switching Protocols&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.s.4"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">11.2</a></li>
    5073                         <li>200 OK&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.s.6"><b>4.4.1</b></a>, <a href="#rfc.xref.status.200.2">11.2</a></li>
    5074                         <li>201 Created&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.s.7"><b>4.4.2</b></a>, <a href="#rfc.xref.status.201.2">11.2</a></li>
    5075                         <li>202 Accepted&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.s.8"><b>4.4.3</b></a>, <a href="#rfc.xref.status.202.2">11.2</a></li>
    5076                         <li>203 Non-Authoritative Information&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.s.9"><b>4.4.4</b></a>, <a href="#rfc.xref.status.203.2">11.2</a>, <a href="#rfc.xref.status.203.3">C</a></li>
    5077                         <li>204 No Content&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.s.10"><b>4.4.5</b></a>, <a href="#rfc.xref.status.204.2">11.2</a></li>
    5078                         <li>205 Reset Content&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.s.11"><b>4.4.6</b></a>, <a href="#rfc.xref.status.205.2">11.2</a></li>
    5079                         <li>300 Multiple Choices&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.s.13"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">11.2</a></li>
    5080                         <li>301 Moved Permanently&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.s.14"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">11.2</a>, <a href="#rfc.xref.status.301.3">C</a></li>
    5081                         <li>302 Found&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.s.15"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">11.2</a>, <a href="#rfc.xref.status.302.3">C</a></li>
    5082                         <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.s.16"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">11.2</a></li>
    5083                         <li>305 Use Proxy&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.s.17"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">11.2</a>, <a href="#rfc.xref.status.305.3">C</a></li>
    5084                         <li>306 (Unused)&nbsp;&nbsp;<a href="#rfc.iref.s.18"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">11.2</a></li>
    5085                         <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.s.19"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">11.2</a>, <a href="#rfc.xref.status.307.3">C</a></li>
    5086                         <li>400 Bad Request&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.s.21"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">11.2</a></li>
    5087                         <li>402 Payment Required&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.s.22"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">11.2</a></li>
    5088                         <li>403 Forbidden&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.s.23"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">11.2</a></li>
    5089                         <li>404 Not Found&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.s.24"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">11.2</a></li>
    5090                         <li>405 Method Not Allowed&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.s.25"><b>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">11.2</a></li>
    5091                         <li>406 Not Acceptable&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.s.26"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">11.2</a></li>
    5092                         <li>408 Request Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.s.27"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">11.2</a></li>
    5093                         <li>409 Conflict&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.s.28"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">11.2</a></li>
    5094                         <li>410 Gone&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.s.29"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">11.2</a></li>
    5095                         <li>411 Length Required&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.s.30"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">11.2</a></li>
    5096                         <li>413 Request Representation Too Large&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.s.31"><b>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">11.2</a></li>
    5097                         <li>414 URI Too Long&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.s.32"><b>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">11.2</a></li>
    5098                         <li>415 Unsupported Media Type&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.s.33"><b>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">11.2</a></li>
    5099                         <li>417 Expectation Failed&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.s.34"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">11.2</a></li>
    5100                         <li>426 Upgrade Required&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.s.35"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">11.2</a>, <a href="#rfc.xref.status.426.3">C</a></li>
    5101                         <li>500 Internal Server Error&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.s.37"><b>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">11.2</a></li>
    5102                         <li>501 Not Implemented&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.s.38"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">11.2</a></li>
    5103                         <li>502 Bad Gateway&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.s.39"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">11.2</a></li>
    5104                         <li>503 Service Unavailable&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.s.40"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">11.2</a></li>
    5105                         <li>504 Gateway Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.s.41"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">11.2</a></li>
    5106                         <li>505 HTTP Version Not Supported&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.s.42"><b>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">11.2</a></li>
     5102                        <li>100 Continue&nbsp;&nbsp;<a href="#rfc.xref.status.100.1">4.1</a>, <a href="#rfc.iref.s.3"><b>4.3.1</b></a>, <a href="#rfc.xref.status.100.2">10.2</a></li>
     5103                        <li>101 Switching Protocols&nbsp;&nbsp;<a href="#rfc.xref.status.101.1">4.1</a>, <a href="#rfc.iref.s.4"><b>4.3.2</b></a>, <a href="#rfc.xref.status.101.2">10.2</a></li>
     5104                        <li>200 OK&nbsp;&nbsp;<a href="#rfc.xref.status.200.1">4.1</a>, <a href="#rfc.iref.s.6"><b>4.4.1</b></a>, <a href="#rfc.xref.status.200.2">10.2</a></li>
     5105                        <li>201 Created&nbsp;&nbsp;<a href="#rfc.xref.status.201.1">4.1</a>, <a href="#rfc.iref.s.7"><b>4.4.2</b></a>, <a href="#rfc.xref.status.201.2">10.2</a></li>
     5106                        <li>202 Accepted&nbsp;&nbsp;<a href="#rfc.xref.status.202.1">4.1</a>, <a href="#rfc.iref.s.8"><b>4.4.3</b></a>, <a href="#rfc.xref.status.202.2">10.2</a></li>
     5107                        <li>203 Non-Authoritative Information&nbsp;&nbsp;<a href="#rfc.xref.status.203.1">4.1</a>, <a href="#rfc.iref.s.9"><b>4.4.4</b></a>, <a href="#rfc.xref.status.203.2">10.2</a>, <a href="#rfc.xref.status.203.3">C</a></li>
     5108                        <li>204 No Content&nbsp;&nbsp;<a href="#rfc.xref.status.204.1">4.1</a>, <a href="#rfc.iref.s.10"><b>4.4.5</b></a>, <a href="#rfc.xref.status.204.2">10.2</a></li>
     5109                        <li>205 Reset Content&nbsp;&nbsp;<a href="#rfc.xref.status.205.1">4.1</a>, <a href="#rfc.iref.s.11"><b>4.4.6</b></a>, <a href="#rfc.xref.status.205.2">10.2</a></li>
     5110                        <li>300 Multiple Choices&nbsp;&nbsp;<a href="#rfc.xref.status.300.1">4.1</a>, <a href="#rfc.iref.s.13"><b>4.5.1</b></a>, <a href="#rfc.xref.status.300.2">10.2</a></li>
     5111                        <li>301 Moved Permanently&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.s.14"><b>4.5.2</b></a>, <a href="#rfc.xref.status.301.2">10.2</a>, <a href="#rfc.xref.status.301.3">C</a></li>
     5112                        <li>302 Found&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.s.15"><b>4.5.3</b></a>, <a href="#rfc.xref.status.302.2">10.2</a>, <a href="#rfc.xref.status.302.3">C</a></li>
     5113                        <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.s.16"><b>4.5.4</b></a>, <a href="#rfc.xref.status.303.2">10.2</a></li>
     5114                        <li>305 Use Proxy&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.s.17"><b>4.5.5</b></a>, <a href="#rfc.xref.status.305.2">10.2</a>, <a href="#rfc.xref.status.305.3">C</a></li>
     5115                        <li>306 (Unused)&nbsp;&nbsp;<a href="#rfc.iref.s.18"><b>4.5.6</b></a>, <a href="#rfc.xref.status.306.1">10.2</a></li>
     5116                        <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.s.19"><b>4.5.7</b></a>, <a href="#rfc.xref.status.307.2">10.2</a>, <a href="#rfc.xref.status.307.3">C</a></li>
     5117                        <li>400 Bad Request&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.s.21"><b>4.6.1</b></a>, <a href="#rfc.xref.status.400.2">10.2</a></li>
     5118                        <li>402 Payment Required&nbsp;&nbsp;<a href="#rfc.xref.status.402.1">4.1</a>, <a href="#rfc.iref.s.22"><b>4.6.2</b></a>, <a href="#rfc.xref.status.402.2">10.2</a></li>
     5119                        <li>403 Forbidden&nbsp;&nbsp;<a href="#rfc.xref.status.403.1">4.1</a>, <a href="#rfc.iref.s.23"><b>4.6.3</b></a>, <a href="#rfc.xref.status.403.2">10.2</a></li>
     5120                        <li>404 Not Found&nbsp;&nbsp;<a href="#rfc.xref.status.404.1">4.1</a>, <a href="#rfc.iref.s.24"><b>4.6.4</b></a>, <a href="#rfc.xref.status.404.2">10.2</a></li>
     5121                        <li>405 Method Not Allowed&nbsp;&nbsp;<a href="#rfc.xref.status.405.1">4.1</a>, <a href="#rfc.iref.s.25"><b>4.6.5</b></a>, <a href="#rfc.xref.status.405.2">10.2</a></li>
     5122                        <li>406 Not Acceptable&nbsp;&nbsp;<a href="#rfc.xref.status.406.1">4.1</a>, <a href="#rfc.iref.s.26"><b>4.6.6</b></a>, <a href="#rfc.xref.status.406.2">10.2</a></li>
     5123                        <li>408 Request Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.408.1">4.1</a>, <a href="#rfc.iref.s.27"><b>4.6.7</b></a>, <a href="#rfc.xref.status.408.2">10.2</a></li>
     5124                        <li>409 Conflict&nbsp;&nbsp;<a href="#rfc.xref.status.409.1">4.1</a>, <a href="#rfc.iref.s.28"><b>4.6.8</b></a>, <a href="#rfc.xref.status.409.2">10.2</a></li>
     5125                        <li>410 Gone&nbsp;&nbsp;<a href="#rfc.xref.status.410.1">4.1</a>, <a href="#rfc.iref.s.29"><b>4.6.9</b></a>, <a href="#rfc.xref.status.410.2">10.2</a></li>
     5126                        <li>411 Length Required&nbsp;&nbsp;<a href="#rfc.xref.status.411.1">4.1</a>, <a href="#rfc.iref.s.30"><b>4.6.10</b></a>, <a href="#rfc.xref.status.411.2">10.2</a></li>
     5127                        <li>413 Request Representation Too Large&nbsp;&nbsp;<a href="#rfc.xref.status.413.1">4.1</a>, <a href="#rfc.iref.s.31"><b>4.6.11</b></a>, <a href="#rfc.xref.status.413.2">10.2</a></li>
     5128                        <li>414 URI Too Long&nbsp;&nbsp;<a href="#rfc.xref.status.414.1">4.1</a>, <a href="#rfc.iref.s.32"><b>4.6.12</b></a>, <a href="#rfc.xref.status.414.2">10.2</a></li>
     5129                        <li>415 Unsupported Media Type&nbsp;&nbsp;<a href="#rfc.xref.status.415.1">4.1</a>, <a href="#rfc.iref.s.33"><b>4.6.13</b></a>, <a href="#rfc.xref.status.415.2">10.2</a></li>
     5130                        <li>417 Expectation Failed&nbsp;&nbsp;<a href="#rfc.xref.status.417.1">4.1</a>, <a href="#rfc.iref.s.34"><b>4.6.14</b></a>, <a href="#rfc.xref.status.417.2">10.2</a></li>
     5131                        <li>426 Upgrade Required&nbsp;&nbsp;<a href="#rfc.xref.status.426.1">4.1</a>, <a href="#rfc.iref.s.35"><b>4.6.15</b></a>, <a href="#rfc.xref.status.426.2">10.2</a>, <a href="#rfc.xref.status.426.3">C</a></li>
     5132                        <li>500 Internal Server Error&nbsp;&nbsp;<a href="#rfc.xref.status.500.1">4.1</a>, <a href="#rfc.iref.s.37"><b>4.7.1</b></a>, <a href="#rfc.xref.status.500.2">10.2</a></li>
     5133                        <li>501 Not Implemented&nbsp;&nbsp;<a href="#rfc.xref.status.501.1">4.1</a>, <a href="#rfc.iref.s.38"><b>4.7.2</b></a>, <a href="#rfc.xref.status.501.2">10.2</a></li>
     5134                        <li>502 Bad Gateway&nbsp;&nbsp;<a href="#rfc.xref.status.502.1">4.1</a>, <a href="#rfc.iref.s.39"><b>4.7.3</b></a>, <a href="#rfc.xref.status.502.2">10.2</a></li>
     5135                        <li>503 Service Unavailable&nbsp;&nbsp;<a href="#rfc.xref.status.503.1">4.1</a>, <a href="#rfc.iref.s.40"><b>4.7.4</b></a>, <a href="#rfc.xref.status.503.2">10.2</a></li>
     5136                        <li>504 Gateway Timeout&nbsp;&nbsp;<a href="#rfc.xref.status.504.1">4.1</a>, <a href="#rfc.iref.s.41"><b>4.7.5</b></a>, <a href="#rfc.xref.status.504.2">10.2</a></li>
     5137                        <li>505 HTTP Version Not Supported&nbsp;&nbsp;<a href="#rfc.xref.status.505.1">4.1</a>, <a href="#rfc.iref.s.42"><b>4.7.6</b></a>, <a href="#rfc.xref.status.505.2">10.2</a></li>
    51075138                     </ul>
    51085139                  </li>
    … …  
    51195150            </li>
    51205151            <li><a id="rfc.index.T" href="#rfc.index.T"><b>T</b></a><ul>
    5121                   <li>TRACE method&nbsp;&nbsp;<a href="#rfc.iref.t.1"><b>2.3.7</b></a>, <a href="#rfc.xref.TRACE.1">9.14</a>, <a href="#rfc.xref.TRACE.2">11.1</a>, <a href="#rfc.xref.TRACE.3">12.1</a></li>
     5152                  <li>TRACE method&nbsp;&nbsp;<a href="#rfc.iref.t.1"><b>2.3.7</b></a>, <a href="#rfc.xref.TRACE.1">9.14</a>, <a href="#rfc.xref.TRACE.2">10.1</a>, <a href="#rfc.xref.TRACE.3">11.1</a></li>
    51225153               </ul>
    51235154            </li>
    51245155            <li><a id="rfc.index.U" href="#rfc.index.U"><b>U</b></a><ul>
    5125                   <li>User-Agent header field&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.xref.header.user-agent.2">8.1</a>, <a href="#rfc.iref.u.1"><b>9.18</b></a>, <a href="#rfc.xref.header.user-agent.3">11.3</a>, <a href="#rfc.xref.header.user-agent.4">12.1</a></li>
     5156                  <li>User-Agent header field&nbsp;&nbsp;<a href="#rfc.xref.header.user-agent.1">3.2</a>, <a href="#rfc.xref.header.user-agent.2">8.1</a>, <a href="#rfc.iref.u.1"><b>9.18</b></a>, <a href="#rfc.xref.header.user-agent.3">10.3</a>, <a href="#rfc.xref.header.user-agent.4">11.1</a></li>
    51265157               </ul>
    51275158            </li>
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