Changeset 437


Ignore:
Timestamp:
Dec 11, 2008, 8:02:40 AM (11 years ago)
Author:
julian.reschke@…
Message:

Synchronize with trunk (../latest), with the exception of Part 6. Fix P7 where it pointed into a section that was removed from Part 6.

Location:
draft-ietf-httpbis/latest-roy
Files:
15 edited

Legend:

Unmodified
Added
Removed
  • draft-ietf-httpbis/latest-roy/Makefile

    r308 r437  
    1313          p6-cache.html \
    1414          p7-auth.html \
    15           p8-cookies.html \
    1615          p1-messaging.redxml \
    1716          p2-semantics.redxml \
     
    2120          p6-cache.redxml \
    2221          p7-auth.redxml \
    23           p8-cookies.redxml \
    2422          p1-messaging.txt \
    2523          p2-semantics.txt \
     
    2927          p6-cache.txt \
    3028          p7-auth.txt \
    31           p8-cookies.txt \
    3229          p1-messaging.iana-headers \
    3330          p2-semantics.iana-headers \
  • draft-ietf-httpbis/latest-roy/p1-messaging.html

    r388 r437  
    333333  }
    334334  @top-right {
    335        content: "November 2008";
     335       content: "December 2008";
    336336  }
    337337  @top-center {
     
    379379      <link rel="Appendix" title="B Compatibility with Previous Versions" href="#rfc.section.B">
    380380      <link rel="Appendix" title="C Terminology" href="#rfc.section.C">
    381       <link rel="Appendix" title="D Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.D">
     381      <link rel="Appendix" title="D Collected ABNF" href="#rfc.section.D">
     382      <link rel="Appendix" title="E Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.E">
    382383      <meta name="generator" content="http://greenbytes.de/tech/webdav/rfc2629.xslt, Revision 1.400, 2008-10-10 14:04:14, XSLT vendor: SAXON 8.9 from Saxonica http://www.saxonica.com/">
    383384      <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/">
     
    392393      <meta name="DC.Creator" content="Reschke, J. F.">
    393394      <meta name="DC.Identifier" content="urn:ietf:id:draft-ietf-httpbis-p1-messaging-latest">
    394       <meta name="DC.Date.Issued" scheme="ISO8601" content="2008-11">
     395      <meta name="DC.Date.Issued" scheme="ISO8601" content="2008-12">
    395396      <meta name="DC.Relation.Replaces" content="urn:ietf:rfc:2616">
    396397      <meta name="DC.Description.Abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 1 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 1 provides an overview of HTTP and its associated terminology, defines the &#34;http&#34; and &#34;https&#34; Uniform Resource Identifier (URI) schemes, defines the generic message syntax and parsing requirements for HTTP message frames, and describes general security concerns for implementations.">
     
    423424         </tr>
    424425         <tr>
    425             <td class="header left">Expires: May 2009</td>
     426            <td class="header left">Expires: June 2009</td>
    426427            <td class="header right">HP</td>
    427428         </tr>
     
    476477         <tr>
    477478            <td class="header left"></td>
    478             <td class="header right">November 15, 2008</td>
     479            <td class="header right">December 11, 2008</td>
    479480         </tr>
    480481      </table>
     
    496497      <p>The list of Internet-Draft Shadow Directories can be accessed at &lt;<a href="http://www.ietf.org/shadow.html">http://www.ietf.org/shadow.html</a>&gt;.
    497498      </p>
    498       <p>This Internet-Draft will expire in May 2009.</p>
     499      <p>This Internet-Draft will expire in June 2009.</p>
    499500      <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
    500501      <p>The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
     
    509510         list is at &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/report/11">http://tools.ietf.org/wg/httpbis/trac/report/11</a>&gt; and related documents (including fancy diffs) can be found at &lt;<a href="http://tools.ietf.org/wg/httpbis/">http://tools.ietf.org/wg/httpbis/</a>&gt;.
    510511      </p> 
    511       <p>The changes in this draft are summarized in <a href="#changes.since.05" title="Since draft-ietf-httpbis-p1-messaging-05">Appendix&nbsp;D.7</a>.
     512      <p>The changes in this draft are summarized in <a href="#changes.since.05" title="Since draft-ietf-httpbis-p1-messaging-05">Appendix&nbsp;E.7</a>.
    512513      </p>
    513514      <hr class="noprint">
     
    517518               <li class="tocline1">1.1&nbsp;&nbsp;&nbsp;<a href="#intro.requirements">Requirements</a></li>
    518519               <li class="tocline1">1.2&nbsp;&nbsp;&nbsp;<a href="#notation">Syntax Notation</a><ul class="toc">
    519                      <li class="tocline1">1.2.1&nbsp;&nbsp;&nbsp;<a href="#notation.abnf">ABNF Extensions</a><ul class="toc">
    520                            <li class="tocline1">1.2.1.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.1.2.1.1">#rule</a></li>
    521                            <li class="tocline1">1.2.1.2&nbsp;&nbsp;&nbsp;<a href="#implied.LWS">implied *LWS</a></li>
    522                         </ul>
    523                      </li>
     520                     <li class="tocline1">1.2.1&nbsp;&nbsp;&nbsp;<a href="#notation.abnf">ABNF Extension: #rule</a></li>
    524521                     <li class="tocline1">1.2.2&nbsp;&nbsp;&nbsp;<a href="#basic.rules">Basic Rules</a></li>
    525522                     <li class="tocline1">1.2.3&nbsp;&nbsp;&nbsp;<a href="#abnf.dependencies">ABNF Rules defined in other Parts of the Specification</a></li>
     
    653650         </li>
    654651         <li class="tocline0">C.&nbsp;&nbsp;&nbsp;<a href="#terminology">Terminology</a></li>
    655          <li class="tocline0">D.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul class="toc">
    656                <li class="tocline1">D.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.1">Since RFC2616</a></li>
    657                <li class="tocline1">D.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.2">Since draft-ietf-httpbis-p1-messaging-00</a></li>
    658                <li class="tocline1">D.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.3">Since draft-ietf-httpbis-p1-messaging-01</a></li>
    659                <li class="tocline1">D.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p1-messaging-02</a></li>
    660                <li class="tocline1">D.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p1-messaging-03</a></li>
    661                <li class="tocline1">D.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p1-messaging-04</a></li>
    662                <li class="tocline1">D.7&nbsp;&nbsp;&nbsp;<a href="#changes.since.05">Since draft-ietf-httpbis-p1-messaging-05</a></li>
     652         <li class="tocline0">D.&nbsp;&nbsp;&nbsp;<a href="#collected.abnf">Collected ABNF</a></li>
     653         <li class="tocline0">E.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul class="toc">
     654               <li class="tocline1">E.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.E.1">Since RFC2616</a></li>
     655               <li class="tocline1">E.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.E.2">Since draft-ietf-httpbis-p1-messaging-00</a></li>
     656               <li class="tocline1">E.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.E.3">Since draft-ietf-httpbis-p1-messaging-01</a></li>
     657               <li class="tocline1">E.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p1-messaging-02</a></li>
     658               <li class="tocline1">E.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p1-messaging-03</a></li>
     659               <li class="tocline1">E.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p1-messaging-04</a></li>
     660               <li class="tocline1">E.7&nbsp;&nbsp;&nbsp;<a href="#changes.since.05">Since draft-ietf-httpbis-p1-messaging-05</a></li>
    663661            </ul>
    664662         </li>
     
    711709      <div id="rfc.iref.g.11"></div>
    712710      <div id="rfc.iref.g.12"></div>
    713       <div id="rfc.iref.g.13"></div>
    714711      <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>
    715712      <div id="core.rules">
    716          <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>. 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#section-B.1">Appendix B.1</a>: ALPHA (letters), CHAR (any <a href="#USASCII" id="rfc.xref.USASCII.1"><cite title="Coded Character Set -- 7-bit American Standard Code for Information Interchange">[USASCII]</cite></a> character, excluding NUL), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),
    717             HEXDIG (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab), LF (line feed), OCTET (any 8-bit sequence of data), SP (space) and
    718             WSP (white space).
     713         <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>. 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#section-B.1">Appendix B.1</a>: ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), HEXDIG
     714            (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit sequence of data), SP (space), VCHAR (any visible <a href="#USASCII" id="rfc.xref.USASCII.1"><cite title="Coded Character Set -- 7-bit American Standard Code for Information Interchange">[USASCII]</cite></a> character), and WSP (whitespace).
    719715         </p>
    720716      </div>
    721       <h3 id="rfc.section.1.2.1"><a href="#rfc.section.1.2.1">1.2.1</a>&nbsp;<a id="notation.abnf" href="#notation.abnf">ABNF Extensions</a></h3>
    722       <p id="rfc.section.1.2.1.p.1">Two extensions to the ABNF rules of <a href="#RFC5234" id="rfc.xref.RFC5234.3"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a> are used to improve readability.<span class="comment">[rfc.comment.1: The current plan is to remove these extensions prior to the last call draft.]</span>
    723       </p>
    724       <h4 id="rfc.section.1.2.1.1"><a href="#rfc.section.1.2.1.1">1.2.1.1</a>&nbsp;#rule
    725       </h4>
    726       <p id="rfc.section.1.2.1.1.p.1">A construct "#" is defined, similar to "*", for defining lists of elements. The full form is "&lt;n&gt;#&lt;m&gt;element" indicating at
    727          least &lt;n&gt; and at most &lt;m&gt; elements, each separated by one or more commas (",") and <em class="bcp14">OPTIONAL</em> linear white space (OWS). This makes the usual form of lists very easy; a rule such as
    728       </p>
    729       <div id="rfc.figure.u.1"></div><pre class="text"> ( *<a href="#rule.whitespace" class="smpl">OWS</a> element *( *<a href="#rule.whitespace" class="smpl">OWS</a> "," *<a href="#rule.whitespace" class="smpl">OWS</a> element ))</pre><p id="rfc.section.1.2.1.1.p.2">can be shown as </p>
    730       <div id="rfc.figure.u.2"></div><pre class="text"> 1#element</pre><p id="rfc.section.1.2.1.1.p.3">Wherever this construct is used, null elements are allowed, but do not contribute to the count of elements present. That is,
    731          "(element), , (element) " is permitted, but counts as only two elements. Therefore, where at least one element is required,
    732          at least one non-null element <em class="bcp14">MUST</em> be present. Default values are 0 and infinity so that "#element" allows any number, including zero; "1#element" requires at
    733          least one; and "1#2element" allows one or two.
    734       </p>
    735       <div id="rfc.iref.i.1"></div>
    736       <h4 id="rfc.section.1.2.1.2"><a href="#rfc.section.1.2.1.2">1.2.1.2</a>&nbsp;<a id="implied.LWS" href="#implied.LWS">implied *LWS</a></h4>
    737       <p id="rfc.section.1.2.1.2.p.1">The grammar described by this specification is word-based. Except where noted otherwise, linear white space (LWS) can be included
    738          between any two adjacent words (token or quoted-string), and between adjacent words and separators, without changing the interpretation
    739          of a field. At least one delimiter (LWS and/or separators) <em class="bcp14">MUST</em> exist between any two tokens (for the definition of "token" below), since they would otherwise be interpreted as a single
    740          token.
     717      <h3 id="rfc.section.1.2.1"><a href="#rfc.section.1.2.1">1.2.1</a>&nbsp;<a id="notation.abnf" href="#notation.abnf">ABNF Extension: #rule</a></h3>
     718      <p id="rfc.section.1.2.1.p.1">One extension to the ABNF rules of <a href="#RFC5234" id="rfc.xref.RFC5234.3"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a> is used to improve readability.
     719      </p>
     720      <p id="rfc.section.1.2.1.p.2">A construct "#" is defined, similar to "*", for defining lists of elements. The full form is "&lt;n&gt;#&lt;m&gt;element" indicating at
     721         least &lt;n&gt; and at most &lt;m&gt; elements, each separated by a single comma (",") and optional whitespace (OWS).
     722      </p>
     723      <div id="rfc.figure.u.1"></div>
     724      <p>Thus,</p><pre class="text">  1#element =&gt; element *( OWS "," OWS element )
     725</pre><div id="rfc.figure.u.2"></div>
     726      <p>and:</p><pre class="text">  #element =&gt; [ 1#element ]
     727</pre><div id="rfc.figure.u.3"></div>
     728      <p>and for n &gt;= 1 and m &gt; 1:</p><pre class="text">  &lt;n&gt;#&lt;m&gt;element =&gt; element &lt;n-1&gt;*&lt;m-1&gt;( OWS "," OWS element )
     729</pre><p id="rfc.section.1.2.1.p.6">For compatibility with legacy list rules, recipients <em class="bcp14">SHOULD</em> accept empty list elements. In other words, consumers would follow the list productions:
     730      </p>
     731      <div id="rfc.figure.u.4"></div><pre class="text">#element =&gt; [ ( "," / element ) *( OWS "," [ OWS element ] ) ]
     732
     7331#element =&gt; *( "," OWS ) element *( OWS "," [ OWS element ] )
     734</pre><p id="rfc.section.1.2.1.p.8"> <a href="#collected.abnf" title="Collected ABNF">Appendix&nbsp;D</a> shows the collected ABNF, with the list rules expanded as explained above.
    741735      </p>
    742736      <h3 id="rfc.section.1.2.2"><a href="#rfc.section.1.2.2">1.2.2</a>&nbsp;<a id="basic.rules" href="#basic.rules">Basic Rules</a></h3>
    743737      <div id="rule.CRLF">
    744738         <p id="rfc.section.1.2.2.p.1">  HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all protocol elements except the entity-body (see <a href="#tolerant.applications" title="Tolerant Applications">Appendix&nbsp;A</a> for tolerant applications). The end-of-line marker within an entity-body is defined by its associated media type, as described
    745             in <a href="p3-payload.html#media.types" title="Media Types">Section 3.3</a> of <a href="#Part3" id="rfc.xref.Part3.2"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
     739            in <a href="p3-payload.html#media.types" title="Media Types">Section 2.3</a> of <a href="#Part3" id="rfc.xref.Part3.2"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    746740         </p>
    747741      </div>
    748742      <div id="rule.LWS">
    749          <p id="rfc.section.1.2.2.p.2">All linear white space (LWS) in header field-values has the same semantics as SP. A recipient <em class="bcp14">MAY</em> replace any such linear white space with a single SP before interpreting the field value or forwarding the message downstream.
     743         <p id="rfc.section.1.2.2.p.2">This specification uses three rules to denote the use of linear whitespace: OWS (optional whitespace), RWS (required whitespace),
     744            and BWS ("bad" whitespace).
    750745         </p>
    751746      </div>
    752       <p id="rfc.section.1.2.2.p.3">Historically, HTTP/1.1 header field values allow linear white space folding across multiple lines. However, this specification
    753          deprecates its use; senders <em class="bcp14">MUST NOT</em> produce messages that include LWS folding (i.e., use the obs-fold rule), except within the message/http media type (<a href="#internet.media.type.message.http" title="Internet Media Type message/http">Section&nbsp;9.3.1</a>). Receivers <em class="bcp14">SHOULD</em> still parse folded linear white space.
    754       </p>
    755       <p id="rfc.section.1.2.2.p.4">This specification uses three rules to denote the use of linear white space; BWS ("Bad" White Space), OWS (Optional White
    756          Space), and RWS (Required White Space).
    757       </p>
    758       <p id="rfc.section.1.2.2.p.5">"Bad" white space is allowed by the BNF, but senders <em class="bcp14">SHOULD NOT</em> produce it in messages. Receivers <em class="bcp14">MUST</em> accept it in incoming messages.
    759       </p>
    760       <p id="rfc.section.1.2.2.p.6">Required white space is used when at least one linear white space character is required to separate field tokens. In all such
    761          cases, a single SP character <em class="bcp14">SHOULD</em> be used.
     747      <p id="rfc.section.1.2.2.p.3">The OWS rule is used where zero or more linear whitespace characters may appear. OWS <em class="bcp14">SHOULD</em> either not be produced or be produced as a single SP character. Multiple OWS characters that occur within field-content <em class="bcp14">SHOULD</em> be replaced with a single SP before interpreting the field value or forwarding the message downstream.
     748      </p>
     749      <p id="rfc.section.1.2.2.p.4">RWS is used when at least one linear whitespace character is required to separate field tokens. RWS <em class="bcp14">SHOULD</em> be produced as a single SP character. Multiple RWS characters that occur within field-content <em class="bcp14">SHOULD</em> be replaced with a single SP before interpreting the field value or forwarding the message downstream.
     750      </p>
     751      <p id="rfc.section.1.2.2.p.5">BWS is used where the grammar allows optional whitespace for historical reasons but senders <em class="bcp14">SHOULD NOT</em> produce it in messages. HTTP/1.1 recipients <em class="bcp14">MUST</em> accept such bad optional whitespace and remove it before interpreting the field value or forwarding the message downstream.
    762752      </p>
    763753      <div id="rule.whitespace">
    764          <p id="rfc.section.1.2.2.p.7">        </p>
     754         <p id="rfc.section.1.2.2.p.6">        </p>
    765755      </div>
    766       <div id="rfc.figure.u.3"></div><pre class="inline"><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span><span id="rfc.iref.g.16"></span>  <a href="#rule.whitespace" class="smpl">OWS</a>            = *( [ obs-fold ] <a href="#core.rules" class="smpl">WSP</a> )
    767                  ; "optional" white space
     756      <div id="rfc.figure.u.5"></div><pre class="inline"><span id="rfc.iref.g.13"></span><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  <a href="#rule.whitespace" class="smpl">OWS</a>            = *( [ obs-fold ] <a href="#core.rules" class="smpl">WSP</a> )
     757                 ; "optional" whitespace
    768758  <a href="#rule.whitespace" class="smpl">RWS</a>            = 1*( [ obs-fold ] <a href="#core.rules" class="smpl">WSP</a> )
    769                  ; "required" white space
     759                 ; "required" whitespace
    770760  <a href="#rule.whitespace" class="smpl">BWS</a>            = <a href="#rule.whitespace" class="smpl">OWS</a>
    771                  ; "bad" white space
     761                 ; "bad" whitespace
    772762  <a href="#rule.whitespace" class="smpl">obs-fold</a>       = <a href="#core.rules" class="smpl">CRLF</a>
    773 </pre><div id="rule.TEXT">
    774          <p id="rfc.section.1.2.2.p.9">  The TEXT rule is only used for descriptive field contents and values that are not intended to be interpreted by the message
    775             parser. Words of *TEXT <em class="bcp14">MAY</em> contain characters from character sets other than ISO-8859-1 <a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.1"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a> only when encoded according to the rules of <a href="#RFC2047" id="rfc.xref.RFC2047.1"><cite title="MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text">[RFC2047]</cite></a>.
     763                 ; see <a href="#message.headers" title="Message Headers">Section&nbsp;4.2</a>
     764</pre><div id="rule.token.separators">
     765         <p id="rfc.section.1.2.2.p.8">    Many HTTP/1.1 header field values consist of words separated by whitespace or special characters. These special characters <em class="bcp14">MUST</em> be in a quoted string to be used within a parameter value (as defined in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;3.3</a>).
    776766         </p>
    777767      </div>
    778       <div id="rfc.figure.u.4"></div><pre class="inline"><span id="rfc.iref.g.17"></span>  <a href="#rule.TEXT" class="smpl">TEXT</a>           = %x20-7E / %x80-FF / <a href="#rule.whitespace" class="smpl">OWS</a>
    779                  ; any <a href="#core.rules" class="smpl">OCTET</a> except <a href="#core.rules" class="smpl">CTL</a>s, but including <a href="#rule.whitespace" class="smpl">OWS</a>
    780 </pre><p id="rfc.section.1.2.2.p.11">A CRLF is allowed in the definition of TEXT only as part of a header field continuation. It is expected that the folding LWS
    781          will be replaced with a single SP before interpretation of the TEXT value.
    782       </p>
    783       <div id="rule.token.separators">
    784          <p id="rfc.section.1.2.2.p.12">    Many HTTP/1.1 header field values consist of words separated by LWS or special characters. These special characters <em class="bcp14">MUST</em> be in a quoted string to be used within a parameter value (as defined in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;3.3</a>).
    785          </p>
    786       </div>
    787       <div id="rfc.figure.u.5"></div><pre class="inline"><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span>  <a href="#rule.token.separators" class="smpl">tchar</a>          = "!" / "#" / "$" / "%" / "&amp;" / "'" / "*"
     768      <div id="rfc.figure.u.6"></div><pre class="inline"><span id="rfc.iref.g.16"></span><span id="rfc.iref.g.17"></span>  <a href="#rule.token.separators" class="smpl">tchar</a>          = "!" / "#" / "$" / "%" / "&amp;" / "'" / "*"
    788769                 / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
    789770                 / <a href="#core.rules" class="smpl">DIGIT</a> / <a href="#core.rules" class="smpl">ALPHA</a>
    790771                 
    791772  <a href="#rule.token.separators" class="smpl">token</a>          = 1*<a href="#rule.token.separators" class="smpl">tchar</a>
    792 </pre><div id="rule.comment">
    793          <p id="rfc.section.1.2.2.p.14">    Comments can be included in some HTTP header fields by surrounding the comment text with parentheses. Comments are only allowed
    794             in fields containing "comment" as part of their field value definition. In all other fields, parentheses are considered part
    795             of the field value.
     773</pre><div id="rule.quoted-string">
     774         <p id="rfc.section.1.2.2.p.10">      A string of text is parsed as a single word if it is quoted using double-quote marks.</p>
     775      </div>
     776      <div id="rfc.figure.u.7"></div><pre class="inline"><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  <a href="#rule.quoted-string" class="smpl">quoted-string</a>  = <a href="#core.rules" class="smpl">DQUOTE</a> *( <a href="#rule.quoted-string" class="smpl">qdtext</a> / <a href="#rule.quoted-pair" class="smpl">quoted-pair</a> ) <a href="#core.rules" class="smpl">DQUOTE</a>
     777  <a href="#rule.quoted-string" class="smpl">qdtext</a>         = *( <a href="#rule.whitespace" class="smpl">OWS</a> / %x21 / %x23-5B / %x5D-7E / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     778  <a href="#rule.quoted-string" class="smpl">obs-text</a>       = %x80-FF
     779</pre><div id="rule.quoted-pair">
     780         <p id="rfc.section.1.2.2.p.12">    The backslash character ("\") <em class="bcp14">MAY</em> be used as a single-character quoting mechanism only within quoted-string and comment constructs.
    796781         </p>
    797782      </div>
    798       <div id="rfc.figure.u.6"></div><pre class="inline"><span id="rfc.iref.g.20"></span><span id="rfc.iref.g.21"></span>  <a href="#rule.comment" class="smpl">comment</a>        = "(" *( <a href="#rule.comment" class="smpl">ctext</a> / <a href="#rule.quoted-pair" class="smpl">quoted-pair</a> / <a href="#rule.comment" class="smpl">comment</a> ) ")"
    799   <a href="#rule.comment" class="smpl">ctext</a>          = &lt;any <a href="#rule.TEXT" class="smpl">TEXT</a> excluding "(" and ")"&gt;
    800 </pre><div id="rule.quoted-string">
    801          <p id="rfc.section.1.2.2.p.16">    A string of text is parsed as a single word if it is quoted using double-quote marks.</p>
    802       </div>
    803       <div id="rfc.figure.u.7"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  <a href="#rule.quoted-string" class="smpl">quoted-string</a>  = <a href="#core.rules" class="smpl">DQUOTE</a> *(<a href="#rule.quoted-string" class="smpl">qdtext</a> / <a href="#rule.quoted-pair" class="smpl">quoted-pair</a> ) <a href="#core.rules" class="smpl">DQUOTE</a>
    804   <a href="#rule.quoted-string" class="smpl">qdtext</a>         = &lt;any <a href="#rule.TEXT" class="smpl">TEXT</a> excluding <a href="#core.rules" class="smpl">DQUOTE</a> and "\"&gt;
    805 </pre><div id="rule.quoted-pair">
    806          <p id="rfc.section.1.2.2.p.18">    The backslash character ("\") <em class="bcp14">MAY</em> be used as a single-character quoting mechanism only within quoted-string and comment constructs.
    807          </p>
    808       </div>
    809       <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  <a href="#rule.quoted-pair" class="smpl">quoted-text</a>    = %x01-09 /
     783      <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.21"></span><span id="rfc.iref.g.22"></span>  <a href="#rule.quoted-pair" class="smpl">quoted-text</a>    = %x01-09 /
    810784                   %x0B-0C /
    811785                   %x0E-FF ; Characters excluding NUL, <a href="#core.rules" class="smpl">CR</a> and <a href="#core.rules" class="smpl">LF</a>
     
    813787</pre><h3 id="rfc.section.1.2.3"><a href="#rfc.section.1.2.3">1.2.3</a>&nbsp;<a id="abnf.dependencies" href="#abnf.dependencies">ABNF Rules defined in other Parts of the Specification</a></h3>
    814788      <p id="rfc.section.1.2.3.p.1">The ABNF rules below are defined in other parts:</p>
    815       <div id="rfc.figure.u.9"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">request-header</a>  = &lt;request-header, defined in <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 4</a>&gt;
    816   <a href="#abnf.dependencies" class="smpl">response-header</a> = &lt;response-header, defined in <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 6</a>&gt;
    817 </pre><div id="rfc.figure.u.10"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">accept-params</a>   = &lt;accept-params, defined in <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 6.1</a>&gt;
    818   <a href="#abnf.dependencies" class="smpl">entity-body</a>     = &lt;entity-body, defined in <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.body" title="Entity Body">Section 4.2</a>&gt;
    819   <a href="#abnf.dependencies" class="smpl">entity-header</a>   = &lt;entity-header, defined in <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 4.1</a>&gt;
    820 </pre><div id="rfc.figure.u.11"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Cache-Control</a>   = &lt;Cache-Control, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 16.4</a>&gt;
    821   <a href="#abnf.dependencies" class="smpl">Pragma</a>          = &lt;Pragma, defined in <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 16.4</a>&gt;
    822   <a href="#abnf.dependencies" class="smpl">Warning</a>         = &lt;Warning, defined in <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.warning" title="Warning">Section 16.6</a>&gt;
     789      <div id="rfc.figure.u.9"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">request-header</a>  = &lt;request-header, defined in <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 3</a>&gt;
     790  <a href="#abnf.dependencies" class="smpl">response-header</a> = &lt;response-header, defined in <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 5</a>&gt;
     791</pre><div id="rfc.figure.u.10"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">accept-params</a>   = &lt;accept-params, defined in <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 5.1</a>&gt;
     792  <a href="#abnf.dependencies" class="smpl">entity-body</a>     = &lt;entity-body, defined in <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.body" title="Entity Body">Section 3.2</a>&gt;
     793  <a href="#abnf.dependencies" class="smpl">entity-header</a>   = &lt;entity-header, defined in <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>&gt;
     794</pre><div id="rfc.figure.u.11"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Cache-Control</a>   = &lt;Cache-Control, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 4.4</a>&gt;
     795  <a href="#abnf.dependencies" class="smpl">Pragma</a>          = &lt;Pragma, defined in <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 4.4</a>&gt;
     796  <a href="#abnf.dependencies" class="smpl">Warning</a>         = &lt;Warning, defined in <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.warning" title="Warning">Section 4.6</a>&gt;
    823797</pre><h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="architecture" href="#architecture">HTTP architecture</a></h1>
    824798      <p id="rfc.section.2.p.1">HTTP was created with a specific architecture in mind, the World Wide Web, and has evolved over time to support the scalability
     
    834808         "path-abempty", "path-absolute", "query", and "authority" from <a href="#RFC3986" id="rfc.xref.RFC3986.4"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>. In addition, we define a partial-URI rule for protocol elements that allow a relative URI without a fragment.
    835809      </p>
    836       <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.26"></span><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span><span id="rfc.iref.g.31"></span><span id="rfc.iref.g.32"></span>  <a href="#uri" class="smpl">URI</a>           = &lt;URI, defined in <a href="#RFC3986" id="rfc.xref.RFC3986.5"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-3">Section 3</a>&gt;
     810      <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.23"></span><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span><span id="rfc.iref.g.26"></span><span id="rfc.iref.g.27"></span><span id="rfc.iref.g.28"></span><span id="rfc.iref.g.29"></span>  <a href="#uri" class="smpl">URI</a>           = &lt;URI, defined in <a href="#RFC3986" id="rfc.xref.RFC3986.5"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-3">Section 3</a>&gt;
    837811  <a href="#uri" class="smpl">URI-reference</a> = &lt;URI-reference, defined in <a href="#RFC3986" id="rfc.xref.RFC3986.6"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-4.1">Section 4.1</a>&gt;
    838812  <a href="#uri" class="smpl">absolute-URI</a>  = &lt;absolute-URI, defined in <a href="#RFC3986" id="rfc.xref.RFC3986.7"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-4.3">Section 4.3</a>&gt;
     
    858832         for identifiers using the http or https URI schemes.
    859833      </p>
    860       <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.33"></span>  <a href="#http.uri" class="smpl">http-URI</a> = "http:" "//" <a href="#uri" class="smpl">authority</a> <a href="#uri" class="smpl">path-abempty</a> [ "?" <a href="#uri" class="smpl">query</a> ]
     834      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.30"></span>  <a href="#http.uri" class="smpl">http-URI</a> = "http:" "//" <a href="#uri" class="smpl">authority</a> <a href="#uri" class="smpl">path-abempty</a> [ "?" <a href="#uri" class="smpl">query</a> ]
    861835</pre><p id="rfc.section.2.1.1.p.3">If the port is empty or not given, port 80 is assumed. The semantics are that the identified resource is located at the server
    862836         listening for TCP connections on that port of that host, and the request-target for the resource is path-absolute (<a href="#request-target" title="request-target">Section&nbsp;5.1.2</a>). The use of IP addresses in URLs <em class="bcp14">SHOULD</em> be avoided whenever possible (see <a href="#RFC1900" id="rfc.xref.RFC1900.1"><cite title="Renumbering Needs Work">[RFC1900]</cite></a>). If the path-absolute is not present in the URL, it <em class="bcp14">MUST</em> be given as "/" when used as a request-target for a resource (<a href="#request-target" title="request-target">Section&nbsp;5.1.2</a>). If a proxy receives a host name which is not a fully qualified domain name, it <em class="bcp14">MAY</em> add its domain to the host name it received. If a proxy receives a fully qualified domain name, the proxy <em class="bcp14">MUST NOT</em> change the host name.
     
    944918      </p>
    945919      <h2 id="rfc.section.2.3"><a href="#rfc.section.2.3">2.3</a>&nbsp;<a id="http.proxy" href="#http.proxy">Use of HTTP for proxy communication</a></h2>
    946       <p id="rfc.section.2.3.p.1">Configured to use HTTP to proxy HTTP or other protocols.</p>
     920      <p id="rfc.section.2.3.p.1"> <span class="comment">[rfc.comment.1: TBD: Configured to use HTTP to proxy HTTP or other protocols.]</span>
     921      </p>
    947922      <h2 id="rfc.section.2.4"><a href="#rfc.section.2.4">2.4</a>&nbsp;<a id="http.intercept" href="#http.intercept">Interception of HTTP for access control</a></h2>
    948       <p id="rfc.section.2.4.p.1">Interception of HTTP traffic for initiating access control.</p>
     923      <p id="rfc.section.2.4.p.1"> <span class="comment">[rfc.comment.2: TBD: Interception of HTTP traffic for initiating access control.]</span>
     924      </p>
    949925      <h2 id="rfc.section.2.5"><a href="#rfc.section.2.5">2.5</a>&nbsp;<a id="http.others" href="#http.others">Use of HTTP by other protocols</a></h2>
    950       <p id="rfc.section.2.5.p.1">Profiles of HTTP defined by other protocol. Extensions of HTTP like WebDAV.</p>
     926      <p id="rfc.section.2.5.p.1"> <span class="comment">[rfc.comment.3: TBD: Profiles of HTTP defined by other protocol. Extensions of HTTP like WebDAV.]</span>
     927      </p>
    951928      <h2 id="rfc.section.2.6"><a href="#rfc.section.2.6">2.6</a>&nbsp;<a id="http.media" href="#http.media">Use of HTTP by media type specification</a></h2>
    952       <p id="rfc.section.2.6.p.1">Instructions on composing HTTP requests via hypertext formats.</p>
     929      <p id="rfc.section.2.6.p.1"> <span class="comment">[rfc.comment.4: TBD: Instructions on composing HTTP requests via hypertext formats.]</span>
     930      </p>
    953931      <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
    954932      <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="http.version" href="#http.version">HTTP Version</a></h2>
     
    962940      </p>
    963941      <p id="rfc.section.3.1.p.2">The version of an HTTP message is indicated by an HTTP-Version field in the first line of the message. HTTP-Version is case-sensitive.</p>
    964       <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span>  <a href="#http.version" class="smpl">HTTP-Version</a>   = <a href="#http.version" class="smpl">HTTP-Prot-Name</a> "/" 1*<a href="#core.rules" class="smpl">DIGIT</a> "." 1*<a href="#core.rules" class="smpl">DIGIT</a>
     942      <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.31"></span><span id="rfc.iref.g.32"></span>  <a href="#http.version" class="smpl">HTTP-Version</a>   = <a href="#http.version" class="smpl">HTTP-Prot-Name</a> "/" 1*<a href="#core.rules" class="smpl">DIGIT</a> "." 1*<a href="#core.rules" class="smpl">DIGIT</a>
    965943  <a href="#http.version" class="smpl">HTTP-Prot-Name</a> = %x48.54.54.50 ; "HTTP", case-sensitive
    966944</pre><p id="rfc.section.3.1.p.4">Note that the major and minor numbers <em class="bcp14">MUST</em> be treated as separate integers and that each <em class="bcp14">MAY</em> be incremented higher than a single digit. Thus, HTTP/2.4 is a lower version than HTTP/2.13, which in turn is lower than HTTP/12.3.
     
    999977      <p id="rfc.section.3.2.1.p.5">All HTTP date/time stamps <em class="bcp14">MUST</em> be represented in Greenwich Mean Time (GMT), without exception. For the purposes of HTTP, GMT is exactly equal to UTC (Coordinated
    1000978         Universal Time). This is indicated in the first two formats by the inclusion of "GMT" as the three-letter abbreviation for
    1001          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 LWS beyond that specifically included as SP in the grammar.
    1002       </p>
    1003       <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span><span id="rfc.iref.g.39"></span><span id="rfc.iref.g.40"></span><span id="rfc.iref.g.41"></span><span id="rfc.iref.g.42"></span><span id="rfc.iref.g.43"></span><span id="rfc.iref.g.44"></span><span id="rfc.iref.g.45"></span><span id="rfc.iref.g.46"></span><span id="rfc.iref.g.47"></span>  <a href="#full.date" class="smpl">HTTP-date</a>    = <a href="#full.date" class="smpl">rfc1123-date</a> / <a href="#full.date" class="smpl">obsolete-date</a>
     979         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.
     980      </p>
     981      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span><span id="rfc.iref.g.39"></span><span id="rfc.iref.g.40"></span><span id="rfc.iref.g.41"></span><span id="rfc.iref.g.42"></span><span id="rfc.iref.g.43"></span><span id="rfc.iref.g.44"></span>  <a href="#full.date" class="smpl">HTTP-date</a>    = <a href="#full.date" class="smpl">rfc1123-date</a> / <a href="#full.date" class="smpl">obsolete-date</a>
    1004982  <a href="#full.date" class="smpl">obsolete-date</a> = <a href="#full.date" class="smpl">rfc850-date</a> / <a href="#full.date" class="smpl">asctime-date</a>
    1005983  <a href="#full.date" class="smpl">rfc1123-date</a> = <a href="#full.date" class="smpl">wkday</a> "," <a href="#core.rules" class="smpl">SP</a> date1 <a href="#core.rules" class="smpl">SP</a> time <a href="#core.rules" class="smpl">SP</a> GMT
     
    10601038         is a property of the message, not of the original entity.
    10611039      </p>
    1062       <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.48"></span><span id="rfc.iref.g.49"></span>  <a href="#transfer.codings" class="smpl">transfer-coding</a>         = "chunked" / <a href="#transfer.codings" class="smpl">transfer-extension</a>
     1040      <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.45"></span><span id="rfc.iref.g.46"></span>  <a href="#transfer.codings" class="smpl">transfer-coding</a>         = "chunked" / <a href="#transfer.codings" class="smpl">transfer-extension</a>
    10631041  <a href="#transfer.codings" class="smpl">transfer-extension</a>      = <a href="#rule.token.separators" class="smpl">token</a> *( <a href="#rule.whitespace" class="smpl">OWS</a> ";" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#transfer.codings" class="smpl">parameter</a> )
    10641042</pre><div id="rule.parameter">
    10651043         <p id="rfc.section.3.3.p.3">      Parameters are in the form of attribute/value pairs.</p>
    10661044      </div>
    1067       <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.50"></span><span id="rfc.iref.g.51"></span><span id="rfc.iref.g.52"></span>  <a href="#transfer.codings" class="smpl">parameter</a>               = <a href="#rule.parameter" class="smpl">attribute</a> <a href="#rule.whitespace" class="smpl">BWS</a> "=" <a href="#rule.whitespace" class="smpl">BWS</a> <a href="#rule.parameter" class="smpl">value</a>
     1045      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.47"></span><span id="rfc.iref.g.48"></span><span id="rfc.iref.g.49"></span>  <a href="#transfer.codings" class="smpl">parameter</a>               = <a href="#rule.parameter" class="smpl">attribute</a> <a href="#rule.whitespace" class="smpl">BWS</a> "=" <a href="#rule.whitespace" class="smpl">BWS</a> <a href="#rule.parameter" class="smpl">value</a>
    10681046  <a href="#rule.parameter" class="smpl">attribute</a>               = <a href="#rule.token.separators" class="smpl">token</a>
    10691047  <a href="#rule.parameter" class="smpl">value</a>                   = <a href="#rule.token.separators" class="smpl">token</a> / <a href="#rule.quoted-string" class="smpl">quoted-string</a>
     
    10791057      </p>
    10801058      <p id="rfc.section.3.3.p.8">The Internet Assigned Numbers Authority (IANA) acts as a registry for transfer-coding value tokens. Initially, the registry
    1081          contains the following tokens: "chunked" (<a href="#chunked.transfer.encoding" title="Chunked Transfer Coding">Section&nbsp;3.3.1</a>), "gzip", "compress", and "deflate" (<a href="p3-payload.html#content.codings" title="Content Codings">Section 3.2</a> of <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    1082       </p>
    1083       <p id="rfc.section.3.3.p.9">New transfer-coding value tokens <em class="bcp14">SHOULD</em> be registered in the same way as new content-coding value tokens (<a href="p3-payload.html#content.codings" title="Content Codings">Section 3.2</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
     1059         contains the following tokens: "chunked" (<a href="#chunked.transfer.encoding" title="Chunked Transfer Coding">Section&nbsp;3.3.1</a>), "gzip", "compress", and "deflate" (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
     1060      </p>
     1061      <p id="rfc.section.3.3.p.9">New transfer-coding value tokens <em class="bcp14">SHOULD</em> be registered in the same way as new content-coding value tokens (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    10841062      </p>
    10851063      <p id="rfc.section.3.3.p.10">A server which receives an entity-body with a transfer-coding it does not understand <em class="bcp14">SHOULD</em> return 501 (Not Implemented), and close the connection. A server <em class="bcp14">MUST NOT</em> send transfer-codings to an HTTP/1.0 client.
     
    10901068         necessary for the recipient to verify that it has received the full message.
    10911069      </p>
    1092       <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.53"></span><span id="rfc.iref.g.54"></span><span id="rfc.iref.g.55"></span><span id="rfc.iref.g.56"></span><span id="rfc.iref.g.57"></span><span id="rfc.iref.g.58"></span><span id="rfc.iref.g.59"></span><span id="rfc.iref.g.60"></span><span id="rfc.iref.g.61"></span>  <a href="#chunked.transfer.encoding" class="smpl">Chunked-Body</a>   = *<a href="#chunked.transfer.encoding" class="smpl">chunk</a>
     1070      <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.50"></span><span id="rfc.iref.g.51"></span><span id="rfc.iref.g.52"></span><span id="rfc.iref.g.53"></span><span id="rfc.iref.g.54"></span><span id="rfc.iref.g.55"></span><span id="rfc.iref.g.56"></span><span id="rfc.iref.g.57"></span><span id="rfc.iref.g.58"></span>  <a href="#chunked.transfer.encoding" class="smpl">Chunked-Body</a>   = *<a href="#chunked.transfer.encoding" class="smpl">chunk</a>
    10931071                   <a href="#chunked.transfer.encoding" class="smpl">last-chunk</a>
    10941072                   <a href="#chunked.transfer.encoding" class="smpl">trailer-part</a>
     
    11051083  <a href="#chunked.transfer.encoding" class="smpl">chunk-ext-val</a>  = <a href="#rule.token.separators" class="smpl">token</a> / <a href="#rule.quoted-string" class="smpl">quoted-string</a>
    11061084  <a href="#chunked.transfer.encoding" class="smpl">chunk-data</a>     = 1*<a href="#core.rules" class="smpl">OCTET</a> ; a sequence of chunk-size octets
    1107   <a href="#chunked.transfer.encoding" class="smpl">trailer-part</a>   = *(<a href="#abnf.dependencies" class="smpl">entity-header</a> <a href="#core.rules" class="smpl">CRLF</a>)
     1085  <a href="#chunked.transfer.encoding" class="smpl">trailer-part</a>   = *( <a href="#abnf.dependencies" class="smpl">entity-header</a> <a href="#core.rules" class="smpl">CRLF</a> )
    11081086</pre><p id="rfc.section.3.3.1.p.3">The chunk-size field is a string of hex digits indicating the size of the chunk-data in octets. The chunked encoding is ended
    11091087         by any chunk whose size is zero, followed by the trailer, which is terminated by an empty line.
     
    11471125      <h2 id="rfc.section.3.4"><a href="#rfc.section.3.4">3.4</a>&nbsp;<a id="product.tokens" href="#product.tokens">Product Tokens</a></h2>
    11481126      <p id="rfc.section.3.4.p.1">Product tokens are used to allow communicating applications to identify themselves by software name and version. Most fields
    1149          using product tokens also allow sub-products which form a significant part of the application to be listed, separated by white
    1150          space. By convention, the products are listed in order of their significance for identifying the application.
    1151       </p>
    1152       <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.62"></span><span id="rfc.iref.g.63"></span>  <a href="#product.tokens" class="smpl">product</a>         = <a href="#rule.token.separators" class="smpl">token</a> ["/" <a href="#product.tokens" class="smpl">product-version</a>]
     1127         using product tokens also allow sub-products which form a significant part of the application to be listed, separated by whitespace.
     1128         By convention, the products are listed in order of their significance for identifying the application.
     1129      </p>
     1130      <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.59"></span><span id="rfc.iref.g.60"></span>  <a href="#product.tokens" class="smpl">product</a>         = <a href="#rule.token.separators" class="smpl">token</a> ["/" <a href="#product.tokens" class="smpl">product-version</a>]
    11531131  <a href="#product.tokens" class="smpl">product-version</a> = <a href="#rule.token.separators" class="smpl">token</a>
    11541132</pre><p id="rfc.section.3.4.p.3">Examples:</p>
     
    11601138      <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="message.types" href="#message.types">Message Types</a></h2>
    11611139      <p id="rfc.section.4.1.p.1">HTTP messages consist of requests from client to server and responses from server to client.</p>
    1162       <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.64"></span>  <a href="#message.types" class="smpl">HTTP-message</a>   = <a href="#request" class="smpl">Request</a> / <a href="#response" class="smpl">Response</a>     ; HTTP/1.1 messages
     1140      <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.61"></span>  <a href="#message.types" class="smpl">HTTP-message</a>   = <a href="#request" class="smpl">Request</a> / <a href="#response" class="smpl">Response</a>     ; HTTP/1.1 messages
    11631141</pre><p id="rfc.section.4.1.p.3">Request (<a href="#request" title="Request">Section&nbsp;5</a>) and Response (<a href="#response" title="Response">Section&nbsp;6</a>) messages use the generic message format of <a href="#RFC5322" id="rfc.xref.RFC5322.2"><cite title="Internet Message Format">[RFC5322]</cite></a> for transferring entities (the payload of the message). Both types of message consist of a start-line, zero or more header
    11641142         fields (also known as "headers"), an empty line (i.e., a line with nothing preceding the CRLF) indicating the end of the header
    11651143         fields, and possibly a message-body.
    11661144      </p>
    1167       <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.65"></span><span id="rfc.iref.g.66"></span>  <a href="#message.types" class="smpl">generic-message</a> = <a href="#message.types" class="smpl">start-line</a>
    1168                     *(<a href="#message.headers" class="smpl">message-header</a> <a href="#core.rules" class="smpl">CRLF</a>)
     1145      <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.62"></span><span id="rfc.iref.g.63"></span>  <a href="#message.types" class="smpl">generic-message</a> = <a href="#message.types" class="smpl">start-line</a>
     1146                    *( <a href="#message.headers" class="smpl">message-header</a> <a href="#core.rules" class="smpl">CRLF</a> )
    11691147                    <a href="#core.rules" class="smpl">CRLF</a>
    11701148                    [ <a href="#message.body" class="smpl">message-body</a> ]
     
    11761154         by the BNF, an HTTP/1.1 client <em class="bcp14">MUST NOT</em> preface or follow a request with an extra CRLF.
    11771155      </p>
     1156      <p id="rfc.section.4.1.p.7">Whitespace (WSP) <em class="bcp14">MUST NOT</em> be sent between the start-line and the first header field. The presence of whitespace might be an attempt to trick a noncompliant
     1157         implementation of HTTP into ignoring that field or processing the next line as a new request, either of which may result in
     1158         security issues when implementations within the request chain interpret the same message differently. HTTP/1.1 servers <em class="bcp14">MUST</em> reject such a message with a 400 (Bad Request) response.
     1159      </p>
    11781160      <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="message.headers" href="#message.headers">Message Headers</a></h2>
    1179       <p id="rfc.section.4.2.p.1">HTTP header fields, which include general-header (<a href="#general.header.fields" title="General Header Fields">Section&nbsp;4.5</a>), request-header (<a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 4</a> of <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>), response-header (<a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 6</a> of <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>), and entity-header (<a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 4.1</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) fields, follow the same generic format as that given in <a href="http://tools.ietf.org/html/rfc5322#section-2.1">Section 2.1</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.3"><cite title="Internet Message Format">[RFC5322]</cite></a>. Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive. The
    1180          field value <em class="bcp14">MAY</em> be preceded by any amount of LWS, though a single SP is preferred. Header fields can be extended over multiple lines by preceding
    1181          each extra line with at least one SP or HTAB. Applications ought to follow "common form", where one is known or indicated,
    1182          when generating HTTP constructs, since there might exist some implementations that fail to accept anything beyond the common
    1183          forms.
    1184       </p>
    1185       <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.67"></span><span id="rfc.iref.g.68"></span><span id="rfc.iref.g.69"></span><span id="rfc.iref.g.70"></span>  <a href="#message.headers" class="smpl">message-header</a> = <a href="#message.headers" class="smpl">field-name</a> ":" [ <a href="#message.headers" class="smpl">field-value</a> ]
     1161      <p id="rfc.section.4.2.p.1">HTTP header fields follow the same general format as Internet messages in <a href="http://tools.ietf.org/html/rfc5322#section-2.1">Section 2.1</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.3"><cite title="Internet Message Format">[RFC5322]</cite></a>. Each header field consists of a name followed by a colon (":"), optional whitespace, and the field value. Field names are
     1162         case-insensitive.
     1163      </p>
     1164      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.64"></span><span id="rfc.iref.g.65"></span><span id="rfc.iref.g.66"></span><span id="rfc.iref.g.67"></span>  <a href="#message.headers" class="smpl">message-header</a> = <a href="#message.headers" class="smpl">field-name</a> ":" OWS [ <a href="#message.headers" class="smpl">field-value</a> ] OWS
    11861165  <a href="#message.headers" class="smpl">field-name</a>     = <a href="#rule.token.separators" class="smpl">token</a>
    11871166  <a href="#message.headers" class="smpl">field-value</a>    = *( <a href="#message.headers" class="smpl">field-content</a> / <a href="#rule.whitespace" class="smpl">OWS</a> )
    1188   <a href="#message.headers" class="smpl">field-content</a>  = &lt;field content&gt;
    1189 </pre><p id="rfc.section.4.2.p.3"> <span class="comment">[rfc.comment.2: whitespace between field-name and colon is an error and MUST NOT be accepted]</span>
    1190       </p>
    1191       <p id="rfc.section.4.2.p.4">The field-content does not include any leading or trailing LWS: linear white space occurring before the first non-whitespace
    1192          character of the field-value or after the last non-whitespace character of the field-value. Such leading or trailing LWS <em class="bcp14">MAY</em> be removed without changing the semantics of the field value. Any LWS that occurs between field-content <em class="bcp14">MAY</em> be replaced with a single SP before interpreting the field value or forwarding the message downstream.
    1193       </p>
    1194       <p id="rfc.section.4.2.p.5">The order in which header fields with differing field names are received is not significant. However, it is "good practice"
     1167  <a href="#message.headers" class="smpl">field-content</a>  = *( <a href="#core.rules" class="smpl">WSP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     1168</pre><p id="rfc.section.4.2.p.3">Historically, HTTP has allowed field-content with text in the ISO-8859-1 <a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.1"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a> character encoding (allowing other character sets through use of <a href="#RFC2047" id="rfc.xref.RFC2047.1"><cite title="MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text">[RFC2047]</cite></a> encoding). In practice, most HTTP header field-values use only a subset of the US-ASCII charset <a href="#USASCII" id="rfc.xref.USASCII.2"><cite title="Coded Character Set -- 7-bit American Standard Code for Information Interchange">[USASCII]</cite></a>. Newly defined header fields <em class="bcp14">SHOULD</em> constrain their field-values to US-ASCII characters. Recipients <em class="bcp14">SHOULD</em> treat other (obs-text) octets in field-content as opaque data.
     1169      </p>
     1170      <p id="rfc.section.4.2.p.4">No whitespace is allowed between the header field-name and colon. For security reasons, any request message received containing
     1171         such whitespace <em class="bcp14">MUST</em> be rejected with a response code of 400 (Bad Request) and any such whitespace in a response message <em class="bcp14">MUST</em> be removed.
     1172      </p>
     1173      <p id="rfc.section.4.2.p.5">The field value <em class="bcp14">MAY</em> be preceded by optional whitespace; a single SP is preferred. The field-value does not include any leading or trailing white
     1174         space: OWS occurring before the first non-whitespace character of the field-value or after the last non-whitespace character
     1175         of the field-value is ignored and <em class="bcp14">MAY</em> be removed without changing the meaning of the header field.
     1176      </p>
     1177      <p id="rfc.section.4.2.p.6">Historically, HTTP header field values could be extended over multiple lines by preceding each extra line with at least one
     1178         space or horizontal tab character (line folding). This specification deprecates such line folding except within the message/http
     1179         media type (<a href="#internet.media.type.message.http" title="Internet Media Type message/http">Section&nbsp;9.3.1</a>). HTTP/1.1 senders <em class="bcp14">MUST NOT</em> produce messages that include line folding (i.e., that contain any field-content that matches the obs-fold rule) unless the
     1180         message is intended for packaging within the message/http media type. HTTP/1.1 recipients <em class="bcp14">SHOULD</em> accept line folding and replace any embedded obs-fold whitespace with a single SP prior to interpreting the field value or
     1181         forwarding the message downstream.
     1182      </p>
     1183      <div id="rule.comment">
     1184         <p id="rfc.section.4.2.p.7">    Comments can be included in some HTTP header fields by surrounding the comment text with parentheses. Comments are only allowed
     1185            in fields containing "comment" as part of their field value definition. In all other fields, parentheses are considered part
     1186            of the field value.
     1187         </p>
     1188      </div>
     1189      <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.68"></span><span id="rfc.iref.g.69"></span>  <a href="#rule.comment" class="smpl">comment</a>        = "(" *( <a href="#rule.comment" class="smpl">ctext</a> / <a href="#rule.quoted-pair" class="smpl">quoted-pair</a> / <a href="#rule.comment" class="smpl">comment</a> ) ")"
     1190  <a href="#rule.comment" class="smpl">ctext</a>          = *( <a href="#rule.whitespace" class="smpl">OWS</a> / %x21-27 / %x2A-7E / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     1191</pre><p id="rfc.section.4.2.p.9">The order in which header fields with differing field names are received is not significant. However, it is "good practice"
    11951192         to send general-header fields first, followed by request-header or response-header fields, and ending with the entity-header
    11961193         fields.
    11971194      </p>
    1198       <p id="rfc.section.4.2.p.6">Multiple message-header fields with the same field-name <em class="bcp14">MAY</em> be present in a message if and only if the entire field-value for that header field is defined as a comma-separated list [i.e.,
     1195      <p id="rfc.section.4.2.p.10">Multiple message-header fields with the same field-name <em class="bcp14">MAY</em> be present in a message if and only if the entire field-value for that header field is defined as a comma-separated list [i.e.,
    11991196         #(values)]. It <em class="bcp14">MUST</em> be possible to combine the multiple header fields into one "field-name: field-value" pair, without changing the semantics
    12001197         of the message, by appending each subsequent field-value to the first, each separated by a comma. The order in which header
     
    12021199         thus a proxy <em class="bcp14">MUST NOT</em> change the order of these field values when a message is forwarded.
    12031200      </p>
    1204       <p id="rfc.section.4.2.p.7"> </p>
     1201      <p id="rfc.section.4.2.p.11"> </p>
    12051202      <dl class="empty">
    12061203         <dd> <b>Note:</b> the "Set-Cookie" header as implemented in practice (as opposed to how it is specified in <a href="#RFC2109" id="rfc.xref.RFC2109.1"><cite title="HTTP State Management Mechanism">[RFC2109]</cite></a>) can occur multiple times, but does not use the list syntax, and thus cannot be combined into a single line. (See Appendix
     
    12131210         header field (<a href="#header.transfer-encoding" id="rfc.xref.header.transfer-encoding.2" title="Transfer-Encoding">Section&nbsp;8.7</a>).
    12141211      </p>
    1215       <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.71"></span>  <a href="#message.body" class="smpl">message-body</a> = <a href="#abnf.dependencies" class="smpl">entity-body</a>
     1212      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.70"></span>  <a href="#message.body" class="smpl">message-body</a> = <a href="#abnf.dependencies" class="smpl">entity-body</a>
    12161213               / &lt;entity-body encoded as per <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a>&gt;
    12171214</pre><p id="rfc.section.4.3.p.3">Transfer-Encoding <em class="bcp14">MUST</em> be used to indicate any transfer-codings applied by an application to ensure safe and proper transfer of the message. Transfer-Encoding
     
    12201217      <p id="rfc.section.4.3.p.4">The rules for when a message-body is allowed in a message differ for requests and responses.</p>
    12211218      <p id="rfc.section.4.3.p.5">The presence of a message-body in a request is signaled by the inclusion of a Content-Length or Transfer-Encoding header field
    1222          in the request's message-headers. A message-body <em class="bcp14">MUST NOT</em> be included in a request if the specification of the request method (<a href="p2-semantics.html#method" title="Method">Section 3</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) explicitly disallows an entity-body in requests. When a request message contains both a message-body of non-zero length
     1219         in the request's message-headers. A message-body <em class="bcp14">MUST NOT</em> be included in a request if the specification of the request method (<a href="p2-semantics.html#method" title="Method">Section 2</a> of <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) explicitly disallows an entity-body in requests. When a request message contains both a message-body of non-zero length
    12231220         and a method that does not define any semantics for that request message-body, then an origin server <em class="bcp14">SHOULD</em> either ignore the message-body or respond with an appropriate error message (e.g., 413). A proxy or gateway, when presented
    12241221         the same request, <em class="bcp14">SHOULD</em> either forward the request inbound with the message-body or ignore the message-body when determining a response.
     
    12811278         to the entity being transferred. These header fields apply only to the message being transmitted.
    12821279      </p>
    1283       <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.72"></span>  <a href="#general.header.fields" class="smpl">general-header</a> = <a href="#abnf.dependencies" class="smpl">Cache-Control</a>            ; <a href="#Part6" id="rfc.xref.Part6.5"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 16.2</a>
     1280      <div id="rfc.figure.u.32"></div><pre class="inline"><span id="rfc.iref.g.71"></span>  <a href="#general.header.fields" class="smpl">general-header</a> = <a href="#abnf.dependencies" class="smpl">Cache-Control</a>            ; <a href="#Part6" id="rfc.xref.Part6.5"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.cache-control" title="Cache-Control">Section 4.2</a>
    12841281                 / <a href="#header.connection" class="smpl">Connection</a>               ; <a href="#header.connection" id="rfc.xref.header.connection.1" title="Connection">Section&nbsp;8.1</a>
    12851282                 / <a href="#header.date" class="smpl">Date</a>                     ; <a href="#header.date" id="rfc.xref.header.date.1" title="Date">Section&nbsp;8.3</a>
    1286                  / <a href="#abnf.dependencies" class="smpl">Pragma</a>                   ; <a href="#Part6" id="rfc.xref.Part6.6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 16.4</a>
     1283                 / <a href="#abnf.dependencies" class="smpl">Pragma</a>                   ; <a href="#Part6" id="rfc.xref.Part6.6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 4.4</a>
    12871284                 / <a href="#header.trailer" class="smpl">Trailer</a>                  ; <a href="#header.trailer" id="rfc.xref.header.trailer.2" title="Trailer">Section&nbsp;8.6</a>
    12881285                 / <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a>        ; <a href="#header.transfer-encoding" id="rfc.xref.header.transfer-encoding.4" title="Transfer-Encoding">Section&nbsp;8.7</a>
    12891286                 / <a href="#header.upgrade" class="smpl">Upgrade</a>                  ; <a href="#header.upgrade" id="rfc.xref.header.upgrade.1" title="Upgrade">Section&nbsp;8.8</a>
    12901287                 / <a href="#header.via" class="smpl">Via</a>                      ; <a href="#header.via" id="rfc.xref.header.via.1" title="Via">Section&nbsp;8.9</a>
    1291                  / <a href="#abnf.dependencies" class="smpl">Warning</a>                  ; <a href="#Part6" id="rfc.xref.Part6.7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.warning" title="Warning">Section 16.6</a>
     1288                 / <a href="#abnf.dependencies" class="smpl">Warning</a>                  ; <a href="#Part6" id="rfc.xref.Part6.7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.warning" title="Warning">Section 4.6</a>
    12921289</pre><p id="rfc.section.4.5.p.3">General-header field names can be extended reliably only in combination with a change in the protocol version. However, new
    12931290         or experimental header fields may be given the semantics of general header fields if all parties in the communication recognize
     
    12981295         resource, the identifier of the resource, and the protocol version in use.
    12991296      </p>
    1300       <div id="rfc.figure.u.32"></div><pre class="inline"><span id="rfc.iref.g.73"></span>  <a href="#request" class="smpl">Request</a>       = <a href="#request-line" class="smpl">Request-Line</a>              ; <a href="#request-line" title="Request-Line">Section&nbsp;5.1</a>
     1297      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.72"></span>  <a href="#request" class="smpl">Request</a>       = <a href="#request-line" class="smpl">Request-Line</a>              ; <a href="#request-line" title="Request-Line">Section&nbsp;5.1</a>
    13011298                  *(( <a href="#general.header.fields" class="smpl">general-header</a>        ; <a href="#general.header.fields" title="General Header Fields">Section&nbsp;4.5</a>
    1302                    / <a href="#abnf.dependencies" class="smpl">request-header</a>         ; <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 4</a>
    1303                    / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a>)  ; <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 4.1</a>
     1299                   / <a href="#abnf.dependencies" class="smpl">request-header</a>         ; <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 3</a>
     1300                   / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> )  ; <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
    13041301                  <a href="#core.rules" class="smpl">CRLF</a>
    13051302                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;4.3</a>
     
    13081305         The elements are separated by SP characters. No CR or LF is allowed except in the final CRLF sequence.
    13091306      </p>
    1310       <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.74"></span>  <a href="#request-line" class="smpl">Request-Line</a>   = <a href="#method" class="smpl">Method</a> <a href="#core.rules" class="smpl">SP</a> <a href="#request-target" class="smpl">request-target</a> <a href="#core.rules" class="smpl">SP</a> <a href="#http.version" class="smpl">HTTP-Version</a> <a href="#core.rules" class="smpl">CRLF</a>
     1307      <div id="rfc.figure.u.34"></div><pre class="inline"><span id="rfc.iref.g.73"></span>  <a href="#request-line" class="smpl">Request-Line</a>   = <a href="#method" class="smpl">Method</a> <a href="#core.rules" class="smpl">SP</a> <a href="#request-target" class="smpl">request-target</a> <a href="#core.rules" class="smpl">SP</a> <a href="#http.version" class="smpl">HTTP-Version</a> <a href="#core.rules" class="smpl">CRLF</a>
    13111308</pre><h3 id="rfc.section.5.1.1"><a href="#rfc.section.5.1.1">5.1.1</a>&nbsp;<a id="method" href="#method">Method</a></h3>
    13121309      <p id="rfc.section.5.1.1.p.1">The Method token indicates the method to be performed on the resource identified by the request-target. The method is case-sensitive.</p>
    1313       <div id="rfc.figure.u.34"></div><pre class="inline"><span id="rfc.iref.g.75"></span><span id="rfc.iref.g.76"></span>  <a href="#method" class="smpl">Method</a>         = <a href="#rule.token.separators" class="smpl">token</a>
     1310      <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.74"></span><span id="rfc.iref.g.75"></span>  <a href="#method" class="smpl">Method</a>         = <a href="#rule.token.separators" class="smpl">token</a>
    13141311</pre><h3 id="rfc.section.5.1.2"><a href="#rfc.section.5.1.2">5.1.2</a>&nbsp;<a id="request-target" href="#request-target">request-target</a></h3>
    13151312      <p id="rfc.section.5.1.2.p.1">The request-target is a Uniform Resource Identifier (<a href="#uri" title="Uniform Resource Identifiers">Section&nbsp;2.1</a>) and identifies the resource upon which to apply the request.
    13161313      </p>
    1317       <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.77"></span>  <a href="#request-target" class="smpl">request-target</a>    = "*"
     1314      <div id="rfc.figure.u.36"></div><pre class="inline"><span id="rfc.iref.g.76"></span>  <a href="#request-target" class="smpl">request-target</a> = "*"
    13181315                 / <a href="#uri" class="smpl">absolute-URI</a>
    13191316                 / ( <a href="#uri" class="smpl">path-absolute</a> [ "?" <a href="#uri" class="smpl">query</a> ] )
     
    13231320         apply to a resource. One example would be
    13241321      </p>
    1325       <div id="rfc.figure.u.36"></div><pre class="text">    OPTIONS * HTTP/1.1
     1322      <div id="rfc.figure.u.37"></div><pre class="text">  OPTIONS * HTTP/1.1
    13261323</pre><p id="rfc.section.5.1.2.p.5">The absolute-URI form is <em class="bcp14">REQUIRED</em> when the request is being made to a proxy. The proxy is requested to forward the request or service it from a valid cache,
    13271324         and return the response. Note that the proxy <em class="bcp14">MAY</em> forward the request on to another proxy or directly to the server specified by the absolute-URI. In order to avoid request
     
    13291326         Request-Line would be:
    13301327      </p>
    1331       <div id="rfc.figure.u.37"></div><pre class="text">    GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
     1328      <div id="rfc.figure.u.38"></div><pre class="text">  GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
    13321329</pre><p id="rfc.section.5.1.2.p.7">To allow for transition to absolute-URIs in all requests in future versions of HTTP, all HTTP/1.1 servers <em class="bcp14">MUST</em> accept the absolute-URI form in requests, even though HTTP/1.1 clients will only generate them in requests to proxies.
    13331330      </p>
    1334       <p id="rfc.section.5.1.2.p.8">The authority form is only used by the CONNECT method (<a href="p2-semantics.html#CONNECT" title="CONNECT">Section 8.9</a> of <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
     1331      <p id="rfc.section.5.1.2.p.8">The authority form is only used by the CONNECT method (<a href="p2-semantics.html#CONNECT" title="CONNECT">Section 7.9</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    13351332      </p>
    13361333      <p id="rfc.section.5.1.2.p.9">The most common form of request-target is that used to identify a resource on an origin server or gateway. In this case the
     
    13381335         server would create a TCP connection to port 80 of the host "www.example.org" and send the lines:
    13391336      </p>
    1340       <div id="rfc.figure.u.38"></div><pre class="text">    GET /pub/WWW/TheProject.html HTTP/1.1
    1341     Host: www.example.org
     1337      <div id="rfc.figure.u.39"></div><pre class="text">  GET /pub/WWW/TheProject.html HTTP/1.1
     1338  Host: www.example.org
    13421339</pre><p id="rfc.section.5.1.2.p.11">followed by the remainder of the Request. Note that the absolute path cannot be empty; if none is present in the original
    13431340         URI, it <em class="bcp14">MUST</em> be given as "/" (the server root).
    13441341      </p>
    1345       <p id="rfc.section.5.1.2.p.12">The request-target is transmitted in the format specified in <a href="#http.uri" title="http URI scheme">Section&nbsp;2.1.1</a>. If the request-target is encoded using the "% <a href="#core.rules" class="smpl">HEXDIG</a>  <a href="#core.rules" class="smpl">HEXDIG</a>" encoding (<a href="#RFC3986" id="rfc.xref.RFC3986.17"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-2.4">Section 2.4</a>), the origin server <em class="bcp14">MUST</em> decode the request-target in order to properly interpret the request. Servers <em class="bcp14">SHOULD</em> respond to invalid request-targets with an appropriate status code.
    1346       </p>
    1347       <p id="rfc.section.5.1.2.p.13">A transparent proxy <em class="bcp14">MUST NOT</em> rewrite the "path-absolute" part of the received request-target when forwarding it to the next inbound server, except as noted
     1342      <p id="rfc.section.5.1.2.p.12">If a proxy receives a request without any path in the request-target and the method specified is capable of supporting the
     1343         asterisk form of request-target, then the last proxy on the request chain <em class="bcp14">MUST</em> forward the request with "*" as the final request-target.
     1344      </p>
     1345      <div id="rfc.figure.u.40"></div>
     1346      <p>For example, the request</p><pre class="text">  OPTIONS http://www.example.org:8001 HTTP/1.1
     1347</pre><div id="rfc.figure.u.41"></div>
     1348      <p>would be forwarded by the proxy as</p><pre class="text">  OPTIONS * HTTP/1.1
     1349  Host: www.example.org:8001
     1350</pre>  <p>after connecting to port 8001 of host "www.example.org".</p>
     1351      <p id="rfc.section.5.1.2.p.15">The request-target is transmitted in the format specified in <a href="#http.uri" title="http URI scheme">Section&nbsp;2.1.1</a>. If the request-target is encoded using the "% <a href="#core.rules" class="smpl">HEXDIG</a>  <a href="#core.rules" class="smpl">HEXDIG</a>" encoding (<a href="#RFC3986" id="rfc.xref.RFC3986.17"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-2.4">Section 2.4</a>), the origin server <em class="bcp14">MUST</em> decode the request-target in order to properly interpret the request. Servers <em class="bcp14">SHOULD</em> respond to invalid request-targets with an appropriate status code.
     1352      </p>
     1353      <p id="rfc.section.5.1.2.p.16">A transparent proxy <em class="bcp14">MUST NOT</em> rewrite the "path-absolute" part of the received request-target when forwarding it to the next inbound server, except as noted
    13481354         above to replace a null path-absolute with "/".
    13491355      </p>
    1350       <p id="rfc.section.5.1.2.p.14"> </p>
     1356      <p id="rfc.section.5.1.2.p.17"> </p>
    13511357      <dl class="empty">
    13521358         <dd> <b>Note:</b> The "no rewrite" rule prevents the proxy from changing the meaning of the request when the origin server is improperly using
     
    13551361         </dd>
    13561362      </dl>
    1357       <p id="rfc.section.5.1.2.p.15">HTTP does not place a pre-defined limit on the length of a request-target. A server <em class="bcp14">MUST</em> be prepared to receive URIs of unbounded length and respond with the 414 (URI too long) status if the received request-target
    1358          would be longer than the server wishes to handle (see <a href="p2-semantics.html#status.414" title="414 Request-URI Too Long">Section 9.4.15</a> of <a href="#Part2" id="rfc.xref.Part2.8"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    1359       </p>
    1360       <p id="rfc.section.5.1.2.p.16">Various ad-hoc limitations on request-target length are found in practice. It is <em class="bcp14">RECOMMENDED</em> that all HTTP senders and recipients support request-target lengths of 8000 or more OCTETs.
     1363      <p id="rfc.section.5.1.2.p.18">HTTP does not place a pre-defined limit on the length of a request-target. A server <em class="bcp14">MUST</em> be prepared to receive URIs of unbounded length and respond with the 414 (Request-target too Long) status if the received
     1364         request-target would be longer than the server wishes to handle (see <a href="p2-semantics.html#status.414" title="414 Request-target Too Long">Section 8.4.15</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
     1365      </p>
     1366      <p id="rfc.section.5.1.2.p.19">Various ad-hoc limitations on request-target length are found in practice. It is <em class="bcp14">RECOMMENDED</em> that all HTTP senders and recipients support request-target lengths of 8000 or more OCTETs.
    13611367      </p>
    13621368      <h2 id="rfc.section.5.2"><a href="#rfc.section.5.2">5.2</a>&nbsp;<a id="the.resource.identified.by.a.request" href="#the.resource.identified.by.a.request">The Resource Identified by a Request</a></h2>
     
    13831389      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="response" href="#response">Response</a></h1>
    13841390      <p id="rfc.section.6.p.1">After receiving and interpreting a request message, a server responds with an HTTP response message.</p>
    1385       <div id="rfc.figure.u.39"></div><pre class="inline"><span id="rfc.iref.g.78"></span>  <a href="#response" class="smpl">Response</a>      = <a href="#status-line" class="smpl">Status-Line</a>               ; <a href="#status-line" title="Status-Line">Section&nbsp;6.1</a>
     1391      <div id="rfc.figure.u.42"></div><pre class="inline"><span id="rfc.iref.g.77"></span>  <a href="#response" class="smpl">Response</a>      = <a href="#status-line" class="smpl">Status-Line</a>               ; <a href="#status-line" title="Status-Line">Section&nbsp;6.1</a>
    13861392                  *(( <a href="#general.header.fields" class="smpl">general-header</a>        ; <a href="#general.header.fields" title="General Header Fields">Section&nbsp;4.5</a>
    1387                    / <a href="#abnf.dependencies" class="smpl">response-header</a>        ; <a href="#Part2" id="rfc.xref.Part2.9"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 6</a>
    1388                    / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a>)  ; <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 4.1</a>
     1393                   / <a href="#abnf.dependencies" class="smpl">response-header</a>        ; <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 5</a>
     1394                   / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> )  ; <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
    13891395                  <a href="#core.rules" class="smpl">CRLF</a>
    13901396                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;4.3</a>
     
    13941400         CRLF sequence.
    13951401      </p>
    1396       <div id="rfc.figure.u.40"></div><pre class="inline"><span id="rfc.iref.g.79"></span>  <a href="#status-line" class="smpl">Status-Line</a> = <a href="#http.version" class="smpl">HTTP-Version</a> <a href="#core.rules" class="smpl">SP</a> <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a> <a href="#core.rules" class="smpl">SP</a> <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> <a href="#core.rules" class="smpl">CRLF</a>
     1402      <div id="rfc.figure.u.43"></div><pre class="inline"><span id="rfc.iref.g.78"></span>  <a href="#status-line" class="smpl">Status-Line</a> = <a href="#http.version" class="smpl">HTTP-Version</a> <a href="#core.rules" class="smpl">SP</a> <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a> <a href="#core.rules" class="smpl">SP</a> <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> <a href="#core.rules" class="smpl">CRLF</a>
    13971403</pre><h3 id="rfc.section.6.1.1"><a href="#rfc.section.6.1.1">6.1.1</a>&nbsp;<a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h3>
    13981404      <p id="rfc.section.6.1.1.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. These codes
    1399          are fully defined in <a href="p2-semantics.html#status.codes" title="Status Code Definitions">Section 9</a> of <a href="#Part2" id="rfc.xref.Part2.10"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>. The Reason Phrase exists for the sole purpose of providing a textual description associated with the numeric status code,
     1405         are fully defined in <a href="p2-semantics.html#status.codes" title="Status Code Definitions">Section 8</a> of <a href="#Part2" id="rfc.xref.Part2.8"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>. The Reason Phrase exists for the sole purpose of providing a textual description associated with the numeric status code,
    14001406         out of deference to earlier Internet application protocols that were more frequently used with interactive text clients. A
    14011407         client <em class="bcp14">SHOULD</em> ignore the content of the Reason Phrase.
     
    14111417         <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
    14121418      </ul>
    1413       <div id="rfc.figure.u.41"></div><pre class="inline"><span id="rfc.iref.g.80"></span><span id="rfc.iref.g.81"></span><span id="rfc.iref.g.82"></span>  <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a>    = 3<a href="#core.rules" class="smpl">DIGIT</a>
    1414   <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a>  = *&lt;<a href="#rule.TEXT" class="smpl">TEXT</a>, excluding <a href="#core.rules" class="smpl">CR</a>, <a href="#core.rules" class="smpl">LF</a>&gt;
     1419      <div id="rfc.figure.u.44"></div><pre class="inline"><span id="rfc.iref.g.79"></span><span id="rfc.iref.g.80"></span><span id="rfc.iref.g.81"></span>  <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a>    = 3<a href="#core.rules" class="smpl">DIGIT</a>
     1420  <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a>  = *( <a href="#core.rules" class="smpl">WSP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
    14151421</pre><h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="connections" href="#connections">Connections</a></h1>
    14161422      <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="persistent.connections" href="#persistent.connections">Persistent Connections</a></h2>
     
    14671473      <p id="rfc.section.7.1.2.2.p.2">Clients which assume persistent connections and pipeline immediately after connection establishment <em class="bcp14">SHOULD</em> be prepared to retry their connection if the first pipelined attempt fails. If a client does such a retry, it <em class="bcp14">MUST NOT</em> pipeline before it knows the connection is persistent. Clients <em class="bcp14">MUST</em> also be prepared to resend their requests if the server closes the connection before sending all of the corresponding responses.
    14681474      </p>
    1469       <p id="rfc.section.7.1.2.2.p.3">Clients <em class="bcp14">SHOULD NOT</em> pipeline requests using non-idempotent methods or non-idempotent sequences of methods (see <a href="p2-semantics.html#idempotent.methods" title="Idempotent Methods">Section 8.1.2</a> of <a href="#Part2" id="rfc.xref.Part2.11"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). Otherwise, a premature termination of the transport connection could lead to indeterminate results. A client wishing to
     1475      <p id="rfc.section.7.1.2.2.p.3">Clients <em class="bcp14">SHOULD NOT</em> pipeline requests using non-idempotent methods or non-idempotent sequences of methods (see <a href="p2-semantics.html#idempotent.methods" title="Idempotent Methods">Section 7.1.2</a> of <a href="#Part2" id="rfc.xref.Part2.9"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). Otherwise, a premature termination of the transport connection could lead to indeterminate results. A client wishing to
    14701476         send a non-idempotent request <em class="bcp14">SHOULD</em> wait to send that request until it has received the response status for the previous request.
    14711477      </p>
     
    14921498      </p>
    14931499      <p id="rfc.section.7.1.4.p.4">This means that clients, servers, and proxies <em class="bcp14">MUST</em> be able to recover from asynchronous close events. Client software <em class="bcp14">SHOULD</em> reopen the transport connection and retransmit the aborted sequence of requests without user interaction so long as the request
    1494          sequence is idempotent (see <a href="p2-semantics.html#idempotent.methods" title="Idempotent Methods">Section 8.1.2</a> of <a href="#Part2" id="rfc.xref.Part2.12"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). Non-idempotent methods or sequences <em class="bcp14">MUST NOT</em> be automatically retried, although user agents <em class="bcp14">MAY</em> offer a human operator the choice of retrying the request(s). Confirmation by user-agent software with semantic understanding
     1500         sequence is idempotent (see <a href="p2-semantics.html#idempotent.methods" title="Idempotent Methods">Section 7.1.2</a> of <a href="#Part2" id="rfc.xref.Part2.10"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). Non-idempotent methods or sequences <em class="bcp14">MUST NOT</em> be automatically retried, although user agents <em class="bcp14">MAY</em> offer a human operator the choice of retrying the request(s). Confirmation by user-agent software with semantic understanding
    14951501         of the application <em class="bcp14">MAY</em> substitute for user confirmation. The automatic retry <em class="bcp14">SHOULD NOT</em> be repeated if the second sequence of requests fails.
    14961502      </p>
     
    15101516      </p>
    15111517      <h3 id="rfc.section.7.2.3"><a href="#rfc.section.7.2.3">7.2.3</a>&nbsp;<a id="use.of.the.100.status" href="#use.of.the.100.status">Use of the 100 (Continue) Status</a></h3>
    1512       <p id="rfc.section.7.2.3.p.1">The purpose of the 100 (Continue) status (see <a href="p2-semantics.html#status.100" title="100 Continue">Section 9.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.13"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) is to allow a client that is sending a request message with a request body to determine if the origin server is willing
     1518      <p id="rfc.section.7.2.3.p.1">The purpose of the 100 (Continue) status (see <a href="p2-semantics.html#status.100" title="100 Continue">Section 8.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.11"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) is to allow a client that is sending a request message with a request body to determine if the origin server is willing
    15131519         to accept the request (based on the request headers) before the client sends the request body. In some cases, it might either
    15141520         be inappropriate or highly inefficient for the client to send the body if the server will reject the message without looking
     
    15171523      <p id="rfc.section.7.2.3.p.2">Requirements for HTTP/1.1 clients: </p>
    15181524      <ul>
    1519          <li>If a client will wait for a 100 (Continue) response before sending the request body, it <em class="bcp14">MUST</em> send an Expect request-header field (<a href="p2-semantics.html#header.expect" title="Expect">Section 10.2</a> of <a href="#Part2" id="rfc.xref.Part2.14"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) with the "100-continue" expectation.
    1520          </li>
    1521          <li>A client <em class="bcp14">MUST NOT</em> send an Expect request-header field (<a href="p2-semantics.html#header.expect" title="Expect">Section 10.2</a> of <a href="#Part2" id="rfc.xref.Part2.15"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) with the "100-continue" expectation if it does not intend to send a request body.
     1525         <li>If a client will wait for a 100 (Continue) response before sending the request body, it <em class="bcp14">MUST</em> send an Expect request-header field (<a href="p2-semantics.html#header.expect" title="Expect">Section 9.2</a> of <a href="#Part2" id="rfc.xref.Part2.12"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) with the "100-continue" expectation.
     1526         </li>
     1527         <li>A client <em class="bcp14">MUST NOT</em> send an Expect request-header field (<a href="p2-semantics.html#header.expect" title="Expect">Section 9.2</a> of <a href="#Part2" id="rfc.xref.Part2.13"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) with the "100-continue" expectation if it does not intend to send a request body.
    15221528         </li>
    15231529      </ul>
     
    15631569         <li>A proxy <em class="bcp14">MUST NOT</em> forward a 100 (Continue) response if the request message was received from an HTTP/1.0 (or earlier) client and did not include
    15641570            an Expect request-header field with the "100-continue" expectation. This requirement overrides the general rule for forwarding
    1565             of 1xx responses (see <a href="p2-semantics.html#status.1xx" title="Informational 1xx">Section 9.1</a> of <a href="#Part2" id="rfc.xref.Part2.16"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
     1571            of 1xx responses (see <a href="p2-semantics.html#status.1xx" title="Informational 1xx">Section 8.1</a> of <a href="#Part2" id="rfc.xref.Part2.14"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    15661572         </li>
    15671573      </ul>
     
    16031609      </p>
    16041610      <p id="rfc.section.8.1.p.2">The Connection header's value has the following grammar:</p>
    1605       <div id="rfc.figure.u.42"></div><pre class="inline"><span id="rfc.iref.g.83"></span><span id="rfc.iref.g.84"></span><span id="rfc.iref.g.85"></span>  <a href="#header.connection" class="smpl">Connection</a>       = "Connection" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.connection" class="smpl">Connection-v</a>
     1611      <div id="rfc.figure.u.45"></div><pre class="inline"><span id="rfc.iref.g.82"></span><span id="rfc.iref.g.83"></span><span id="rfc.iref.g.84"></span>  <a href="#header.connection" class="smpl">Connection</a>       = "Connection" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.connection" class="smpl">Connection-v</a>
    16061612  <a href="#header.connection" class="smpl">Connection-v</a>     = 1#<a href="#header.connection" class="smpl">connection-token</a>
    16071613  <a href="#header.connection" class="smpl">connection-token</a> = <a href="#rule.token.separators" class="smpl">token</a>
     
    16161622         of the response. For example,
    16171623      </p>
    1618       <div id="rfc.figure.u.43"></div><pre class="text">  Connection: close
     1624      <div id="rfc.figure.u.46"></div><pre class="text">  Connection: close
    16191625</pre><p id="rfc.section.8.1.p.8">in either the request or the response header fields indicates that the connection <em class="bcp14">SHOULD NOT</em> be considered `persistent' (<a href="#persistent.connections" title="Persistent Connections">Section&nbsp;7.1</a>) after the current request/response is complete.
    16201626      </p>
     
    16321638         or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.
    16331639      </p>
    1634       <div id="rfc.figure.u.44"></div><pre class="inline"><span id="rfc.iref.g.86"></span><span id="rfc.iref.g.87"></span>  <a href="#header.content-length" class="smpl">Content-Length</a>   = "Content-Length" ":" <a href="#rule.whitespace" class="smpl">OWS</a> 1*<a href="#header.content-length" class="smpl">Content-Length-v</a>
     1640      <div id="rfc.figure.u.47"></div><pre class="inline"><span id="rfc.iref.g.85"></span><span id="rfc.iref.g.86"></span>  <a href="#header.content-length" class="smpl">Content-Length</a>   = "Content-Length" ":" <a href="#rule.whitespace" class="smpl">OWS</a> 1*<a href="#header.content-length" class="smpl">Content-Length-v</a>
    16351641  <a href="#header.content-length" class="smpl">Content-Length-v</a> = 1*<a href="#core.rules" class="smpl">DIGIT</a>
    16361642</pre><p id="rfc.section.8.2.p.3">An example is</p>
    1637       <div id="rfc.figure.u.45"></div><pre class="text">  Content-Length: 3495
     1643      <div id="rfc.figure.u.48"></div><pre class="text">  Content-Length: 3495
    16381644</pre><p id="rfc.section.8.2.p.5">Applications <em class="bcp14">SHOULD</em> use this field to indicate the transfer-length of the message-body, unless this is prohibited by the rules in <a href="#message.length" title="Message Length">Section&nbsp;4.4</a>.
    16391645      </p>
     
    16501656         as orig-date 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.RFC5322.4"><cite title="Internet Message Format">[RFC5322]</cite></a>. The field value is an HTTP-date, as described in <a href="#full.date" title="Full Date">Section&nbsp;3.2.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
    16511657      </p>
    1652       <div id="rfc.figure.u.46"></div><pre class="inline"><span id="rfc.iref.g.88"></span><span id="rfc.iref.g.89"></span>  <a href="#header.date" class="smpl">Date</a>   = "Date" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.date" class="smpl">Date-v</a>
     1658      <div id="rfc.figure.u.49"></div><pre class="inline"><span id="rfc.iref.g.87"></span><span id="rfc.iref.g.88"></span>  <a href="#header.date" class="smpl">Date</a>   = "Date" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.date" class="smpl">Date-v</a>
    16531659  <a href="#header.date" class="smpl">Date-v</a> = <a href="#full.date" class="smpl">HTTP-date</a>
    16541660</pre><p id="rfc.section.8.3.p.3">An example is</p>
    1655       <div id="rfc.figure.u.47"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
     1661      <div id="rfc.figure.u.50"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
    16561662</pre><p id="rfc.section.8.3.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
    16571663      </p>
     
    16891695         a single IP address.
    16901696      </p>
    1691       <div id="rfc.figure.u.48"></div><pre class="inline"><span id="rfc.iref.g.90"></span><span id="rfc.iref.g.91"></span>  <a href="#header.host" class="smpl">Host</a>   = "Host" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.host" class="smpl">Host-v</a>
     1697      <div id="rfc.figure.u.51"></div><pre class="inline"><span id="rfc.iref.g.89"></span><span id="rfc.iref.g.90"></span>  <a href="#header.host" class="smpl">Host</a>   = "Host" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.host" class="smpl">Host-v</a>
    16921698  <a href="#header.host" class="smpl">Host-v</a> = <a href="#uri" class="smpl">uri-host</a> [ ":" <a href="#uri" class="smpl">port</a> ] ; <a href="#http.uri" title="http URI scheme">Section&nbsp;2.1.1</a>
    16931699</pre><p id="rfc.section.8.4.p.3">A "host" without any trailing port information implies the default port for the service requested (e.g., "80" for an HTTP
    16941700         URL). For example, a request on the origin server for &lt;http://www.example.org/pub/WWW/&gt; would properly include:
    16951701      </p>
    1696       <div id="rfc.figure.u.49"></div><pre class="text">  GET /pub/WWW/ HTTP/1.1
     1702      <div id="rfc.figure.u.52"></div><pre class="text">  GET /pub/WWW/ HTTP/1.1
    16971703  Host: www.example.org
    16981704</pre><p id="rfc.section.8.4.p.5">A client <em class="bcp14">MUST</em> include a Host header field in all HTTP/1.1 request messages. If the requested URI does not include an Internet host name
     
    17091715         and/or a comma-separated list of extension transfer-coding names with optional accept parameters (as described in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;3.3</a>).
    17101716      </p>
    1711       <div id="rfc.figure.u.50"></div><pre class="inline"><span id="rfc.iref.g.92"></span><span id="rfc.iref.g.93"></span><span id="rfc.iref.g.94"></span>  <a href="#header.te" class="smpl">TE</a>        = "TE" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.te" class="smpl">TE-v</a>
     1717      <div id="rfc.figure.u.53"></div><pre class="inline"><span id="rfc.iref.g.91"></span><span id="rfc.iref.g.92"></span><span id="rfc.iref.g.93"></span>  <a href="#header.te" class="smpl">TE</a>        = "TE" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.te" class="smpl">TE-v</a>
    17121718  <a href="#header.te" class="smpl">TE-v</a>      = #<a href="#header.te" class="smpl">t-codings</a>
    17131719  <a href="#header.te" class="smpl">t-codings</a> = "trailers" / ( <a href="#transfer.codings" class="smpl">transfer-extension</a> [ <a href="#abnf.dependencies" class="smpl">accept-params</a> ] )
     
    17161722      </p>
    17171723      <p id="rfc.section.8.5.p.4">Examples of its use are:</p>
    1718       <div id="rfc.figure.u.51"></div><pre class="text">  TE: deflate
     1724      <div id="rfc.figure.u.54"></div><pre class="text">  TE: deflate
    17191725  TE:
    17201726  TE: trailers, deflate;q=0.5
     
    17351741         <li>
    17361742            <p>If the transfer-coding being tested is one of the transfer-codings listed in the TE field, then it is acceptable unless it
    1737                is accompanied by a qvalue of 0. (As defined in <a href="p3-payload.html#quality.values" title="Quality Values">Section 3.4</a> of <a href="#Part3" id="rfc.xref.Part3.11"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, a qvalue of 0 means "not acceptable.")
     1743               is accompanied by a qvalue of 0. (As defined in <a href="p3-payload.html#quality.values" title="Quality Values">Section 2.4</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, a qvalue of 0 means "not acceptable.")
    17381744            </p>
    17391745         </li>
     
    17531759         chunked transfer-coding.
    17541760      </p>
    1755       <div id="rfc.figure.u.52"></div><pre class="inline"><span id="rfc.iref.g.95"></span><span id="rfc.iref.g.96"></span>  <a href="#header.trailer" class="smpl">Trailer</a>   = "Trailer" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.trailer" class="smpl">Trailer-v</a>
     1761      <div id="rfc.figure.u.55"></div><pre class="inline"><span id="rfc.iref.g.94"></span><span id="rfc.iref.g.95"></span>  <a href="#header.trailer" class="smpl">Trailer</a>   = "Trailer" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.trailer" class="smpl">Trailer-v</a>
    17561762  <a href="#header.trailer" class="smpl">Trailer-v</a> = 1#<a href="#message.headers" class="smpl">field-name</a>
    17571763</pre><p id="rfc.section.8.6.p.3">An HTTP/1.1 message <em class="bcp14">SHOULD</em> include a Trailer header field in a message using chunked transfer-coding with a non-empty trailer. Doing so allows the recipient
     
    17741780         transfer-coding is a property of the message, not of the entity.
    17751781      </p>
    1776       <div id="rfc.figure.u.53"></div><pre class="inline"><span id="rfc.iref.g.97"></span><span id="rfc.iref.g.98"></span>  <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a>   = "Transfer-Encoding" ":" <a href="#rule.whitespace" class="smpl">OWS</a>
     1782      <div id="rfc.figure.u.56"></div><pre class="inline"><span id="rfc.iref.g.96"></span><span id="rfc.iref.g.97"></span>  <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a>   = "Transfer-Encoding" ":" <a href="#rule.whitespace" class="smpl">OWS</a>
    17771783                        <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding-v</a>
    17781784  <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding-v</a> = 1#<a href="#transfer.codings" class="smpl">transfer-coding</a>
    17791785</pre><p id="rfc.section.8.7.p.3">Transfer-codings are defined in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;3.3</a>. An example is:
    17801786      </p>
    1781       <div id="rfc.figure.u.54"></div><pre class="text">  Transfer-Encoding: chunked
     1787      <div id="rfc.figure.u.57"></div><pre class="text">  Transfer-Encoding: chunked
    17821788</pre><p id="rfc.section.8.7.p.5">If multiple encodings have been applied to an entity, the transfer-codings <em class="bcp14">MUST</em> be listed in the order in which they were applied. Additional information about the encoding parameters <em class="bcp14">MAY</em> be provided by other entity-header fields not defined by this specification.
    17831789      </p>
     
    17891795         to use if the server finds it appropriate to switch protocols. The server <em class="bcp14">MUST</em> use the Upgrade header field within a 101 (Switching Protocols) response to indicate which protocol(s) are being switched.
    17901796      </p>
    1791       <div id="rfc.figure.u.55"></div><pre class="inline"><span id="rfc.iref.g.99"></span><span id="rfc.iref.g.100"></span>  <a href="#header.upgrade" class="smpl">Upgrade</a>   = "Upgrade" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.upgrade" class="smpl">Upgrade-v</a>
     1797      <div id="rfc.figure.u.58"></div><pre class="inline"><span id="rfc.iref.g.98"></span><span id="rfc.iref.g.99"></span>  <a href="#header.upgrade" class="smpl">Upgrade</a>   = "Upgrade" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.upgrade" class="smpl">Upgrade-v</a>
    17921798  <a href="#header.upgrade" class="smpl">Upgrade-v</a> = 1#<a href="#product.tokens" class="smpl">product</a>
    17931799</pre><p id="rfc.section.8.8.p.3">For example,</p>
    1794       <div id="rfc.figure.u.56"></div><pre class="text">  Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
     1800      <div id="rfc.figure.u.59"></div><pre class="text">  Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
    17951801</pre><p id="rfc.section.8.8.p.5">The Upgrade header field is intended to provide a simple mechanism for transition from HTTP/1.1 to some other, incompatible
    17961802         protocol. It does so by allowing the client to advertise its desire to use another protocol, such as a later version of HTTP
     
    18211827         of all senders along the request/response chain.
    18221828      </p>
    1823       <div id="rfc.figure.u.57"></div><pre class="inline"><span id="rfc.iref.g.101"></span><span id="rfc.iref.g.102"></span><span id="rfc.iref.g.103"></span><span id="rfc.iref.g.104"></span><span id="rfc.iref.g.105"></span><span id="rfc.iref.g.106"></span><span id="rfc.iref.g.107"></span>  <a href="#header.via" class="smpl">Via</a>               = "Via" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.via" class="smpl">Via-v</a>
     1829      <div id="rfc.figure.u.60"></div><pre class="inline"><span id="rfc.iref.g.100"></span><span id="rfc.iref.g.101"></span><span id="rfc.iref.g.102"></span><span id="rfc.iref.g.103"></span><span id="rfc.iref.g.104"></span><span id="rfc.iref.g.105"></span><span id="rfc.iref.g.106"></span>  <a href="#header.via" class="smpl">Via</a>               = "Via" ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.via" class="smpl">Via-v</a>
    18241830  <a href="#header.via" class="smpl">Via-v</a>             = 1#( <a href="#header.via" class="smpl">received-protocol</a> <a href="#rule.whitespace" class="smpl">RWS</a> <a href="#header.via" class="smpl">received-by</a>
    18251831                          [ <a href="#rule.whitespace" class="smpl">RWS</a> <a href="#rule.comment" class="smpl">comment</a> ] )
     
    18461852         server at www.example.com. The request received by www.example.com would then have the following Via header field:
    18471853      </p>
    1848       <div id="rfc.figure.u.58"></div><pre class="text">  Via: 1.0 fred, 1.1 p.example.net (Apache/1.1)
     1854      <div id="rfc.figure.u.61"></div><pre class="text">  Via: 1.0 fred, 1.1 p.example.net (Apache/1.1)
    18491855</pre><p id="rfc.section.8.9.p.9">Proxies and gateways used as a portal through a network firewall <em class="bcp14">SHOULD NOT</em>, by default, forward the names and ports of hosts within the firewall region. This information <em class="bcp14">SHOULD</em> only be propagated if explicitly enabled. If not enabled, the received-by host of any host behind the firewall <em class="bcp14">SHOULD</em> be replaced by an appropriate pseudonym for that host.
    18501856      </p>
     
    18521858         For example,
    18531859      </p>
    1854       <div id="rfc.figure.u.59"></div><pre class="text">  Via: 1.0 ricky, 1.1 ethel, 1.1 fred, 1.0 lucy
     1860      <div id="rfc.figure.u.62"></div><pre class="text">  Via: 1.0 ricky, 1.1 ethel, 1.1 fred, 1.0 lucy
    18551861</pre><p id="rfc.section.8.9.p.12">could be collapsed to</p>
    1856       <div id="rfc.figure.u.60"></div><pre class="text">  Via: 1.0 ricky, 1.1 mertz, 1.0 lucy
     1862      <div id="rfc.figure.u.63"></div><pre class="text">  Via: 1.0 ricky, 1.1 mertz, 1.0 lucy
    18571863</pre><p id="rfc.section.8.9.p.14">Applications <em class="bcp14">SHOULD NOT</em> combine multiple entries unless they are all under the same organizational control and the hosts have already been replaced
    18581864         by pseudonyms. Applications <em class="bcp14">MUST NOT</em> combine entries which have different received-protocol values.
     
    21582164      <h2 id="rfc.references.1"><a href="#rfc.section.12.1" id="rfc.section.12.1">12.1</a> Normative References
    21592165      </h2>
    2160       <table summary="Normative References">                     
     2166      <table summary="Normative References">                   
    21612167         <tr>
    21622168            <td class="reference"><b id="ISO-8859-1">[ISO-8859-1]</b></td>
     
    21682174         <tr>
    21692175            <td class="reference"><b id="Part2">[Part2]</b></td>
    2170             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-latest">HTTP/1.1, part 2: Message Semantics</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p2-semantics-latest (work in progress), November&nbsp;2008.
     2176            <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-latest">HTTP/1.1, part 2: Message Semantics</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p2-semantics-latest (work in progress), December&nbsp;2008.
    21712177            </td>
    21722178         </tr>
    21732179         <tr>
    21742180            <td class="reference"><b id="Part3">[Part3]</b></td>
    2175             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p3-payload-latest">HTTP/1.1, part 3: Message Payload and Content Negotiation</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p3-payload-latest (work in progress), November&nbsp;2008.
     2181            <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p3-payload-latest">HTTP/1.1, part 3: Message Payload and Content Negotiation</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p3-payload-latest (work in progress), December&nbsp;2008.
    21762182            </td>
    21772183         </tr>
    21782184         <tr>
    21792185            <td class="reference"><b id="Part5">[Part5]</b></td>
    2180             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-latest">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-latest (work in progress), November&nbsp;2008.
     2186            <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-latest">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-latest (work in progress), December&nbsp;2008.
    21812187            </td>
    21822188         </tr>
    21832189         <tr>
    21842190            <td class="reference"><b id="Part6">[Part6]</b></td>
    2185             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-latest">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-latest (work in progress), November&nbsp;2008.
     2191            <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-latest">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-latest (work in progress), December&nbsp;2008.
    21862192            </td>
    21872193         </tr>
     
    21922198         </tr>
    21932199         <tr>
    2194             <td class="reference"><b id="RFC2047">[RFC2047]</b></td>
    2195             <td class="top"><a title="University of Tennessee">Moore, K.</a>, “<a href="http://tools.ietf.org/html/rfc2047">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</a>”, RFC&nbsp;2047, November&nbsp;1996.
    2196             </td>
    2197          </tr>
    2198          <tr>
    21992200            <td class="reference"><b id="RFC2119">[RFC2119]</b></td>
    22002201            <td class="top"><a title="Harvard University">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>”, BCP&nbsp;14, RFC&nbsp;2119, March&nbsp;1997.
     
    22182219      <h2 id="rfc.references.2"><a href="#rfc.section.12.2" id="rfc.section.12.2">12.2</a> Informative References
    22192220      </h2>
    2220       <table summary="Informative References">                                             
     2221      <table summary="Informative References">                                               
    22212222         <tr>
    22222223            <td class="reference"><b id="Kri2001">[Kri2001]</b></td>
     
    22582259            <td class="reference"><b id="RFC1945">[RFC1945]</b></td>
    22592260            <td class="top"><a title="MIT, Laboratory for Computer Science">Berners-Lee, T.</a>, <a title="University of California, Irvine, Department of Information and Computer Science">Fielding, R.T.</a>, and <a title="W3 Consortium, MIT Laboratory for Computer Science">H.F. Nielsen</a>, “<a href="http://tools.ietf.org/html/rfc1945">Hypertext Transfer Protocol -- HTTP/1.0</a>”, RFC&nbsp;1945, May&nbsp;1996.
     2261            </td>
     2262         </tr>
     2263         <tr>
     2264            <td class="reference"><b id="RFC2047">[RFC2047]</b></td>
     2265            <td class="top"><a title="University of Tennessee">Moore, K.</a>, “<a href="http://tools.ietf.org/html/rfc2047">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</a>”, RFC&nbsp;2047, November&nbsp;1996.
    22602266            </td>
    22612267         </tr>
     
    23562362         can be interpreted unambiguously.
    23572363      </p>
    2358       <p id="rfc.section.A.p.2">Clients <em class="bcp14">SHOULD</em> be tolerant in parsing the Status-Line and servers tolerant when parsing the Request-Line. In particular, they <em class="bcp14">SHOULD</em> accept any amount of SP or HTAB characters between fields, even though only a single SP is required.
     2364      <p id="rfc.section.A.p.2">Clients <em class="bcp14">SHOULD</em> be tolerant in parsing the Status-Line and servers tolerant when parsing the Request-Line. In particular, they <em class="bcp14">SHOULD</em> accept any amount of WSP characters between fields, even though only a single SP is required.
    23592365      </p>
    23602366      <p id="rfc.section.A.p.3">The line terminator for message-header fields is the sequence CRLF. However, we recommend that applications, when parsing
     
    23622368      </p>
    23632369      <p id="rfc.section.A.p.4">The character set of an entity-body <em class="bcp14">SHOULD</em> be labeled as the lowest common denominator of the character codes used within that body, with the exception that not labeling
    2364          the entity is preferred over labeling the entity with the labels US-ASCII or ISO-8859-1. See <a href="#Part3" id="rfc.xref.Part3.12"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
     2370         the entity is preferred over labeling the entity with the labels US-ASCII or ISO-8859-1. See <a href="#Part3" id="rfc.xref.Part3.11"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    23652371      </p>
    23662372      <p id="rfc.section.A.p.5">Additional rules for requirements on parsing and encoding of dates and other potential problems with date encodings include:</p>
     
    24542460      <p id="rfc.section.B.3.p.2">Transfer-coding and message lengths all interact in ways that required fixing exactly when chunked encoding is used (to allow
    24552461         for transfer encoding that may not be self delimiting); it was important to straighten out exactly how message lengths are
    2456          computed. (Sections <a href="#transfer.codings" title="Transfer Codings">3.3</a>, <a href="#message.length" title="Message Length">4.4</a>, <a href="#header.content-length" id="rfc.xref.header.content-length.3" title="Content-Length">8.2</a>, see also <a href="#Part3" id="rfc.xref.Part3.13"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> and <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>)
     2462         computed. (Sections <a href="#transfer.codings" title="Transfer Codings">3.3</a>, <a href="#message.length" title="Message Length">4.4</a>, <a href="#header.content-length" id="rfc.xref.header.content-length.3" title="Content-Length">8.2</a>, see also <a href="#Part3" id="rfc.xref.Part3.12"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> and <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>)
    24572463      </p>
    24582464      <p id="rfc.section.B.3.p.3">The use and interpretation of HTTP version numbers has been clarified by <a href="#RFC2145" id="rfc.xref.RFC2145.3"><cite title="Use and Interpretation of HTTP Version Numbers">[RFC2145]</cite></a>. Require proxies to upgrade requests to highest protocol version they support to deal with problems discovered in HTTP/1.0
     
    24662472      </p>
    24672473      <h2 id="rfc.section.B.4"><a href="#rfc.section.B.4">B.4</a>&nbsp;<a id="changes.from.rfc.2616" href="#changes.from.rfc.2616">Changes from RFC 2616</a></h2>
    2468       <p id="rfc.section.B.4.p.1">Rules about implicit linear white space between certain grammar productions have been removed; now it's only allowed when
    2469          specifically pointed out in the ABNF. The CHAR rule does not allow the NUL character anymore (this affects the comment and
    2470          quoted-string rules). Furthermore, the quoted-pair rule does not allow escaping NUL, CR or LF anymore. (<a href="#basic.rules" title="Basic Rules">Section&nbsp;1.2.2</a>)
    2471       </p>
    2472       <p id="rfc.section.B.4.p.2">Clarify that HTTP-Version is case sensitive. (<a href="#http.version" title="HTTP Version">Section&nbsp;3.1</a>)
    2473       </p>
    2474       <p id="rfc.section.B.4.p.3">Remove reference to non-existant identity transfer-coding value tokens. (Sections <a href="#transfer.codings" title="Transfer Codings">3.3</a> and <a href="#message.length" title="Message Length">4.4</a>)
    2475       </p>
    2476       <p id="rfc.section.B.4.p.4">Clarification that the chunk length does not include the count of the octets in the chunk header and trailer. (<a href="#chunked.transfer.encoding" title="Chunked Transfer Coding">Section&nbsp;3.3.1</a>)
    2477       </p>
    2478       <p id="rfc.section.B.4.p.5">Update use of abs_path production from RFC1808 to the path-absolute + query components of RFC3986. (<a href="#request-target" title="request-target">Section&nbsp;5.1.2</a>)
    2479       </p>
    2480       <p id="rfc.section.B.4.p.6">Clarify exactly when close connection options must be sent. (<a href="#header.connection" id="rfc.xref.header.connection.8" title="Connection">Section&nbsp;8.1</a>)
     2474      <p id="rfc.section.B.4.p.1">Empty list elements in list productions have been deprecated. (<a href="#notation.abnf" title="ABNF Extension: #rule">Section&nbsp;1.2.1</a>)
     2475      </p>
     2476      <p id="rfc.section.B.4.p.2">Rules about implicit linear whitespace between certain grammar productions have been removed; now it's only allowed when specifically
     2477         pointed out in the ABNF. The NUL character is no longer allowed in comment and quoted-string text. The quoted-pair rule no
     2478         longer allows escaping NUL, CR or LF. Non-ASCII content in header fields and reason phrase has been obsoleted and made opaque
     2479         (the TEXT rule was removed) (<a href="#basic.rules" title="Basic Rules">Section&nbsp;1.2.2</a>)
     2480      </p>
     2481      <p id="rfc.section.B.4.p.3">Clarify that HTTP-Version is case sensitive. (<a href="#http.version" title="HTTP Version">Section&nbsp;3.1</a>)
     2482      </p>
     2483      <p id="rfc.section.B.4.p.4">Remove reference to non-existant identity transfer-coding value tokens. (Sections <a href="#transfer.codings" title="Transfer Codings">3.3</a> and <a href="#message.length" title="Message Length">4.4</a>)
     2484      </p>
     2485      <p id="rfc.section.B.4.p.5">Clarification that the chunk length does not include the count of the octets in the chunk header and trailer. (<a href="#chunked.transfer.encoding" title="Chunked Transfer Coding">Section&nbsp;3.3.1</a>)
     2486      </p>
     2487      <p id="rfc.section.B.4.p.6">Require that invalid whitespace around field-names be rejected. (<a href="#message.headers" title="Message Headers">Section&nbsp;4.2</a>)
     2488      </p>
     2489      <p id="rfc.section.B.4.p.7">Update use of abs_path production from RFC1808 to the path-absolute + query components of RFC3986. (<a href="#request-target" title="request-target">Section&nbsp;5.1.2</a>)
     2490      </p>
     2491      <p id="rfc.section.B.4.p.8">Clarify exactly when close connection options must be sent. (<a href="#header.connection" id="rfc.xref.header.connection.8" title="Connection">Section&nbsp;8.1</a>)
    24812492      </p>
    24822493      <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="terminology" href="#terminology">Terminology</a></h1>
    24832494      <p id="rfc.section.C.p.1">This specification uses a number of terms to refer to the roles played by participants in, and objects of, the HTTP communication.</p>
    2484       <p id="rfc.section.C.p.2"> <span id="rfc.iref.c.3"></span>  <dfn>connection</dfn> 
     2495      <p id="rfc.section.C.p.2"> <span id="rfc.iref.c.3"></span>  <dfn>cache</dfn> 
     2496      </p>
     2497      <dl class="empty">
     2498         <dd>A program's local store of response messages and the subsystem that controls its message storage, retrieval, and deletion.
     2499            A cache stores cacheable responses in order to reduce the response time and network bandwidth consumption on future, equivalent
     2500            requests. Any client or server may include a cache, though a cache cannot be used by a server that is acting as a tunnel.
     2501         </dd>
     2502      </dl>
     2503      <p id="rfc.section.C.p.3"> <span id="rfc.iref.c.4"></span>  <dfn>cacheable</dfn> 
     2504      </p>
     2505      <dl class="empty">
     2506         <dd>A response is cacheable if a cache is allowed to store a copy of the response message for use in answering subsequent requests.
     2507            The rules for determining the cacheability of HTTP responses are defined in <a href="p6-cache.html#caching" title="Introduction">Section 1</a> of <a href="#Part6" id="rfc.xref.Part6.9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>. Even if a resource is cacheable, there may be additional constraints on whether a cache can use the cached copy for a particular
     2508            request.
     2509         </dd>
     2510      </dl>
     2511      <p id="rfc.section.C.p.4"> <span id="rfc.iref.c.5"></span>  <dfn>client</dfn> 
     2512      </p>
     2513      <dl class="empty">
     2514         <dd>A program that establishes connections for the purpose of sending requests.</dd>
     2515      </dl>
     2516      <p id="rfc.section.C.p.5"> <span id="rfc.iref.c.6"></span>  <dfn>connection</dfn> 
    24852517      </p>
    24862518      <dl class="empty">
    24872519         <dd>A transport layer virtual circuit established between two programs for the purpose of communication.</dd>
    24882520      </dl>
    2489       <p id="rfc.section.C.p.3"> <span id="rfc.iref.m.4"></span>  <dfn>message</dfn> 
     2521      <p id="rfc.section.C.p.6"> <span id="rfc.iref.c.7"></span>  <dfn>content negotiation</dfn> 
     2522      </p>
     2523      <dl class="empty">
     2524         <dd>The mechanism for selecting the appropriate representation when servicing a request, as described in <a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 4</a> of <a href="#Part3" id="rfc.xref.Part3.13"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>. The representation of entities in any response can be negotiated (including error responses).
     2525         </dd>
     2526      </dl>
     2527      <p id="rfc.section.C.p.7"> <span id="rfc.iref.e.1"></span>  <dfn>entity</dfn> 
     2528      </p>
     2529      <dl class="empty">
     2530         <dd>The information transferred as the payload of a request or response. An entity consists of metainformation in the form of
     2531            entity-header fields and content in the form of an entity-body, as described in <a href="p3-payload.html#entity" title="Entity">Section 3</a> of <a href="#Part3" id="rfc.xref.Part3.14"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
     2532         </dd>
     2533      </dl>
     2534      <p id="rfc.section.C.p.8"> <span id="rfc.iref.g.107"></span>  <dfn>gateway</dfn> 
     2535      </p>
     2536      <dl class="empty">
     2537         <dd>A server which acts as an intermediary for some other server. Unlike a proxy, a gateway receives requests as if it were the
     2538            origin server for the requested resource; the requesting client may not be aware that it is communicating with a gateway.
     2539         </dd>
     2540      </dl>
     2541      <p id="rfc.section.C.p.9"> <span id="rfc.iref.i.1"></span>  <span id="rfc.iref.o.1"></span>  <dfn>inbound</dfn>/<dfn>outbound</dfn> 
     2542      </p>
     2543      <dl class="empty">
     2544         <dd>Inbound and outbound refer to the request and response paths for messages: "inbound" means "traveling toward the origin server",
     2545            and "outbound" means "traveling toward the user agent"
     2546         </dd>
     2547      </dl>
     2548      <p id="rfc.section.C.p.10"> <span id="rfc.iref.m.4"></span>  <dfn>message</dfn> 
    24902549      </p>
    24912550      <dl class="empty">
     
    24932552         </dd>
    24942553      </dl>
    2495       <p id="rfc.section.C.p.4"> <span id="rfc.iref.r.1"></span>  <dfn>request</dfn> 
    2496       </p>
    2497       <dl class="empty">
    2498          <dd>An HTTP request message, as defined in <a href="#request" title="Request">Section&nbsp;5</a>.
    2499          </dd>
    2500       </dl>
    2501       <p id="rfc.section.C.p.5"> <span id="rfc.iref.r.2"></span>  <dfn>response</dfn> 
    2502       </p>
    2503       <dl class="empty">
    2504          <dd>An HTTP response message, as defined in <a href="#response" title="Response">Section&nbsp;6</a>.
    2505          </dd>
    2506       </dl>
    2507       <p id="rfc.section.C.p.6"> <span id="rfc.iref.r.3"></span>  <dfn>resource</dfn> 
    2508       </p>
    2509       <dl class="empty">
    2510          <dd>A network data object or service that can be identified by a URI, as defined in <a href="#uri" title="Uniform Resource Identifiers">Section&nbsp;2.1</a>. Resources may be available in multiple representations (e.g. multiple languages, data formats, size, and resolutions) or
    2511             vary in other ways.
    2512          </dd>
    2513       </dl>
    2514       <p id="rfc.section.C.p.7"> <span id="rfc.iref.e.1"></span>  <dfn>entity</dfn> 
    2515       </p>
    2516       <dl class="empty">
    2517          <dd>The information transferred as the payload of a request or response. An entity consists of metainformation in the form of
    2518             entity-header fields and content in the form of an entity-body, as described in <a href="p3-payload.html#entity" title="Entity">Section 4</a> of <a href="#Part3" id="rfc.xref.Part3.14"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    2519          </dd>
    2520       </dl>
    2521       <p id="rfc.section.C.p.8"> <span id="rfc.iref.r.4"></span>  <dfn>representation</dfn> 
    2522       </p>
    2523       <dl class="empty">
    2524          <dd>An entity included with a response that is subject to content negotiation, as described in <a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.15"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>. There may exist multiple representations associated with a particular response status.
    2525          </dd>
    2526       </dl>
    2527       <p id="rfc.section.C.p.9"> <span id="rfc.iref.c.4"></span>  <dfn>content negotiation</dfn> 
    2528       </p>
    2529       <dl class="empty">
    2530          <dd>The mechanism for selecting the appropriate representation when servicing a request, as described in <a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.16"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>. The representation of entities in any response can be negotiated (including error responses).
    2531          </dd>
    2532       </dl>
    2533       <p id="rfc.section.C.p.10"> <span id="rfc.iref.v.2"></span>  <dfn>variant</dfn> 
    2534       </p>
    2535       <dl class="empty">
    2536          <dd>A resource may have one, or more than one, representation(s) associated with it at any given instant. Each of these representations
    2537             is termed a `variant'. Use of the term `variant' does not necessarily imply that the resource is subject to content negotiation.
    2538          </dd>
    2539       </dl>
    2540       <p id="rfc.section.C.p.11"> <span id="rfc.iref.c.5"></span>  <dfn>client</dfn> 
    2541       </p>
    2542       <dl class="empty">
    2543          <dd>A program that establishes connections for the purpose of sending requests.</dd>
    2544       </dl>
    2545       <p id="rfc.section.C.p.12"> <span id="rfc.iref.u.4"></span>  <dfn>user agent</dfn> 
    2546       </p>
    2547       <dl class="empty">
    2548          <dd>The client which initiates a request. These are often browsers, editors, spiders (web-traversing robots), or other end user
    2549             tools.
    2550          </dd>
    2551       </dl>
    2552       <p id="rfc.section.C.p.13"> <span id="rfc.iref.s.1"></span>  <dfn>server</dfn> 
    2553       </p>
    2554       <dl class="empty">
    2555          <dd>An application program that accepts connections in order to service requests by sending back responses. Any given program
    2556             may be capable of being both a client and a server; our use of these terms refers only to the role being performed by the
    2557             program for a particular connection, rather than to the program's capabilities in general. Likewise, any server may act as
    2558             an origin server, proxy, gateway, or tunnel, switching behavior based on the nature of each request.
    2559          </dd>
    2560       </dl>
    2561       <p id="rfc.section.C.p.14"> <span id="rfc.iref.o.1"></span>  <dfn>origin server</dfn> 
     2554      <p id="rfc.section.C.p.11"> <span id="rfc.iref.o.2"></span>  <dfn>origin server</dfn> 
    25622555      </p>
    25632556      <dl class="empty">
    25642557         <dd>The server on which a given resource resides or is to be created.</dd>
    25652558      </dl>
    2566       <p id="rfc.section.C.p.15"> <span id="rfc.iref.p.1"></span>  <dfn>proxy</dfn> 
     2559      <p id="rfc.section.C.p.12"> <span id="rfc.iref.p.1"></span>  <dfn>proxy</dfn> 
    25672560      </p>
    25682561      <dl class="empty">
     
    25752568         </dd>
    25762569      </dl>
    2577       <p id="rfc.section.C.p.16"> <span id="rfc.iref.g.108"></span>  <dfn>gateway</dfn> 
     2570      <p id="rfc.section.C.p.13"> <span id="rfc.iref.r.1"></span>  <dfn>request</dfn> 
    25782571      </p>
    25792572      <dl class="empty">
    2580          <dd>A server which acts as an intermediary for some other server. Unlike a proxy, a gateway receives requests as if it were the
    2581             origin server for the requested resource; the requesting client may not be aware that it is communicating with a gateway.
     2573         <dd>An HTTP request message, as defined in <a href="#request" title="Request">Section&nbsp;5</a>.
    25822574         </dd>
    25832575      </dl>
    2584       <p id="rfc.section.C.p.17"> <span id="rfc.iref.t.4"></span>  <dfn>tunnel</dfn> 
     2576      <p id="rfc.section.C.p.14"> <span id="rfc.iref.r.2"></span>  <dfn>resource</dfn> 
     2577      </p>
     2578      <dl class="empty">
     2579         <dd>A network data object or service that can be identified by a URI, as defined in <a href="#uri" title="Uniform Resource Identifiers">Section&nbsp;2.1</a>. Resources may be available in multiple representations (e.g. multiple languages, data formats, size, and resolutions) or
     2580            vary in other ways.
     2581         </dd>
     2582      </dl>
     2583      <p id="rfc.section.C.p.15"> <span id="rfc.iref.r.3"></span>  <dfn>response</dfn> 
     2584      </p>
     2585      <dl class="empty">
     2586         <dd>An HTTP response message, as defined in <a href="#response" title="Response">Section&nbsp;6</a>.
     2587         </dd>
     2588      </dl>
     2589      <p id="rfc.section.C.p.16"> <span id="rfc.iref.r.4"></span>  <dfn>representation</dfn> 
     2590      </p>
     2591      <dl class="empty">
     2592         <dd>An entity included with a response that is subject to content negotiation, as described in <a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 4</a> of <a href="#Part3" id="rfc.xref.Part3.15"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>. There may exist multiple representations associated with a particular response status.
     2593         </dd>
     2594      </dl>
     2595      <p id="rfc.section.C.p.17"> <span id="rfc.iref.s.1"></span>  <dfn>server</dfn> 
     2596      </p>
     2597      <dl class="empty">
     2598         <dd>An application program that accepts connections in order to service requests by sending back responses. Any given program
     2599            may be capable of being both a client and a server; our use of these terms refers only to the role being performed by the
     2600            program for a particular connection, rather than to the program's capabilities in general. Likewise, any server may act as
     2601            an origin server, proxy, gateway, or tunnel, switching behavior based on the nature of each request.
     2602         </dd>
     2603      </dl>
     2604      <p id="rfc.section.C.p.18"> <span id="rfc.iref.t.4"></span>  <dfn>tunnel</dfn> 
    25852605      </p>
    25862606      <dl class="empty">
     
    25902610         </dd>
    25912611      </dl>
    2592       <p id="rfc.section.C.p.18"> <span id="rfc.iref.c.6"></span>  <dfn>cache</dfn> 
    2593       </p>
    2594       <dl class="empty">
    2595          <dd>A program's local store of response messages and the subsystem that controls its message storage, retrieval, and deletion.
    2596             A cache stores cacheable responses in order to reduce the response time and network bandwidth consumption on future, equivalent
    2597             requests. Any client or server may include a cache, though a cache cannot be used by a server that is acting as a tunnel.
    2598          </dd>
    2599       </dl>
    2600       <p id="rfc.section.C.p.19"> <span id="rfc.iref.c.7"></span>  <dfn>cacheable</dfn> 
    2601       </p>
    2602       <dl class="empty">
    2603          <dd>A response is cacheable if a cache is allowed to store a copy of the response message for use in answering subsequent requests.
    2604             The rules for determining the cacheability of HTTP responses are defined in <a href="p6-cache.html#caching" title="Introduction">Section 1</a> of <a href="#Part6" id="rfc.xref.Part6.9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>. Even if a resource is cacheable, there may be additional constraints on whether a cache can use the cached copy for a particular
    2605             request.
    2606          </dd>
    2607       </dl>
    2608       <p id="rfc.section.C.p.20"> <span id="rfc.iref.u.5"></span>  <span id="rfc.iref.d.2"></span>  <dfn>upstream</dfn>/<dfn>downstream</dfn> 
     2612      <p id="rfc.section.C.p.19"> <span id="rfc.iref.u.4"></span>  <span id="rfc.iref.d.2"></span>  <dfn>upstream</dfn>/<dfn>downstream</dfn> 
    26092613      </p>
    26102614      <dl class="empty">
    26112615         <dd>Upstream and downstream describe the flow of a message: all messages flow from upstream to downstream.</dd>
    26122616      </dl>
    2613       <p id="rfc.section.C.p.21"> <span id="rfc.iref.i.2"></span>  <span id="rfc.iref.o.2"></span>  <dfn>inbound</dfn>/<dfn>outbound</dfn> 
     2617      <p id="rfc.section.C.p.20"> <span id="rfc.iref.u.5"></span>  <dfn>user agent</dfn> 
    26142618      </p>
    26152619      <dl class="empty">
    2616          <dd>Inbound and outbound refer to the request and response paths for messages: "inbound" means "traveling toward the origin server",
    2617             and "outbound" means "traveling toward the user agent"
     2620         <dd>The client which initiates a request. These are often browsers, editors, spiders (web-traversing robots), or other end user
     2621            tools.
    26182622         </dd>
    26192623      </dl>
    2620       <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
    2621       <h2 id="rfc.section.D.1"><a href="#rfc.section.D.1">D.1</a>&nbsp;Since RFC2616
     2624      <p id="rfc.section.C.p.21"> <span id="rfc.iref.v.2"></span>  <dfn>variant</dfn> 
     2625      </p>
     2626      <dl class="empty">
     2627         <dd>A resource may have one, or more than one, representation(s) associated with it at any given instant. Each of these representations
     2628            is termed a `variant'. Use of the term `variant' does not necessarily imply that the resource is subject to content negotiation.
     2629         </dd>
     2630      </dl>
     2631      <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
     2632      <div id="rfc.figure.u.64"></div> <pre class="inline"><a href="#rule.whitespace" class="smpl">BWS</a> = OWS
     2633
     2634<a href="#abnf.dependencies" class="smpl">Cache-Control</a> = &lt;Cache-Control, defined in [Part6], Section 15.4&gt;
     2635<a href="#chunked.transfer.encoding" class="smpl">Chunked-Body</a> = *chunk last-chunk trailer-part CRLF
     2636<a href="#header.connection" class="smpl">Connection</a> = "Connection:" OWS Connection-v
     2637<a href="#header.connection" class="smpl">Connection-v</a> = *( "," OWS ) connection-token *( OWS "," [ OWS
     2638 connection-token ] )
     2639<a href="#header.content-length" class="smpl">Content-Length</a> = "Content-Length:" OWS 1*Content-Length-v
     2640<a href="#header.content-length" class="smpl">Content-Length-v</a> = 1*DIGIT
     2641
     2642<a href="#header.date" class="smpl">Date</a> = "Date:" OWS Date-v
     2643<a href="#header.date" class="smpl">Date-v</a> = HTTP-date
     2644
     2645GMT = %x47.4D.54
     2646
     2647<a href="#http.version" class="smpl">HTTP-Prot-Name</a> = %x48.54.54.50
     2648<a href="#http.version" class="smpl">HTTP-Version</a> = HTTP-Prot-Name "/" 1*DIGIT "." 1*DIGIT
     2649<a href="#full.date" class="smpl">HTTP-date</a> = rfc1123-date / obsolete-date
     2650<a href="#message.types" class="smpl">HTTP-message</a> = Request / Response
     2651<a href="#header.host" class="smpl">Host</a> = "Host:" OWS Host-v
     2652<a href="#header.host" class="smpl">Host-v</a> = uri-host [ ":" port ]
     2653
     2654<a href="#method" class="smpl">Method</a> = token
     2655
     2656<a href="#rule.whitespace" class="smpl">OWS</a> = *( [ obs-fold ] WSP )
     2657
     2658<a href="#abnf.dependencies" class="smpl">Pragma</a> = &lt;Pragma, defined in [Part6], Section 15.4&gt;
     2659
     2660<a href="#rule.whitespace" class="smpl">RWS</a> = 1*( [ obs-fold ] WSP )
     2661<a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> = *( WSP / VCHAR / obs-text )
     2662<a href="#request" class="smpl">Request</a> = Request-Line *( ( general-header / request-header /
     2663 entity-header ) CRLF ) CRLF [ message-body ]
     2664<a href="#request-line" class="smpl">Request-Line</a> = Method SP request-target SP HTTP-Version CRLF
     2665<a href="#response" class="smpl">Response</a> = Status-Line *( ( general-header / response-header /
     2666 entity-header ) CRLF ) CRLF [ message-body ]
     2667
     2668<a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a> = 3DIGIT
     2669<a href="#status-line" class="smpl">Status-Line</a> = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
     2670
     2671<a href="#header.te" class="smpl">TE</a> = "TE:" OWS TE-v
     2672<a href="#header.te" class="smpl">TE-v</a> = [ ( "," / t-codings ) *( OWS "," [ OWS t-codings ] ) ]
     2673<a href="#header.trailer" class="smpl">Trailer</a> = "Trailer:" OWS Trailer-v
     2674<a href="#header.trailer" class="smpl">Trailer-v</a> = *( "," OWS ) field-name *( OWS "," [ OWS field-name ] )
     2675<a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a> = "Transfer-Encoding:" OWS Transfer-Encoding-v
     2676<a href="#header.transfer-encoding" class="smpl">Transfer-Encoding-v</a> = *( "," OWS ) transfer-coding *( OWS "," [ OWS
     2677 transfer-coding ] )
     2678
     2679<a href="#uri" class="smpl">URI</a> = &lt;URI, defined in [RFC3986], Section 3&gt;
     2680<a href="#uri" class="smpl">URI-reference</a> = &lt;URI-reference, defined in [RFC3986], Section 4.1&gt;
     2681<a href="#header.upgrade" class="smpl">Upgrade</a> = "Upgrade:" OWS Upgrade-v
     2682<a href="#header.upgrade" class="smpl">Upgrade-v</a> = *( "," OWS ) product *( OWS "," [ OWS product ] )
     2683
     2684<a href="#header.via" class="smpl">Via</a> = "Via:" OWS Via-v
     2685<a href="#header.via" class="smpl">Via-v</a> = *( "," OWS ) received-protocol RWS received-by [ RWS comment
     2686 ] *( OWS "," [ OWS received-protocol RWS received-by [ RWS comment ]
     2687 ] )
     2688
     2689<a href="#abnf.dependencies" class="smpl">Warning</a> = &lt;Warning, defined in [Part6], Section 15.6&gt;
     2690
     2691<a href="#uri" class="smpl">absolute-URI</a> = &lt;absolute-URI, defined in [RFC3986], Section 4.3&gt;
     2692<a href="#abnf.dependencies" class="smpl">accept-params</a> = &lt;accept-params, defined in [Part3], Section 5.1&gt;
     2693<a href="#full.date" class="smpl">asctime-date</a> = wkday SP date3 SP time SP 4DIGIT
     2694<a href="#rule.parameter" class="smpl">attribute</a> = token
     2695<a href="#uri" class="smpl">authority</a> = &lt;authority, defined in [RFC3986], Section 3.2&gt;
     2696
     2697<a href="#chunked.transfer.encoding" class="smpl">chunk</a> = chunk-size *WSP [ chunk-ext ] CRLF chunk-data CRLF
     2698<a href="#chunked.transfer.encoding" class="smpl">chunk-data</a> = 1*OCTET
     2699<a href="#chunked.transfer.encoding" class="smpl">chunk-ext</a> = *( ";" *WSP chunk-ext-name [ "=" chunk-ext-val ] *WSP )
     2700<a href="#chunked.transfer.encoding" class="smpl">chunk-ext-name</a> = token
     2701<a href="#chunked.transfer.encoding" class="smpl">chunk-ext-val</a> = token / quoted-string
     2702<a href="#chunked.transfer.encoding" class="smpl">chunk-size</a> = 1*HEXDIG
     2703<a href="#rule.comment" class="smpl">comment</a> = "(" *( ctext / quoted-pair / comment ) ")"
     2704<a href="#header.connection" class="smpl">connection-token</a> = token
     2705<a href="#rule.comment" class="smpl">ctext</a> = *( OWS / %x21-27 / %x2A-7E / obs-text )
     2706
     2707<a href="#full.date" class="smpl">date1</a> = 2DIGIT SP month SP 4DIGIT
     2708<a href="#full.date" class="smpl">date2</a> = 2DIGIT "-" month "-" 2DIGIT
     2709<a href="#full.date" class="smpl">date3</a> = month SP ( 2DIGIT / ( SP DIGIT ) )
     2710
     2711<a href="#abnf.dependencies" class="smpl">entity-body</a> = &lt;entity-body, defined in [Part3], Section 3.2&gt;
     2712<a href="#abnf.dependencies" class="smpl">entity-header</a> = &lt;entity-header, defined in [Part3], Section 3.1&gt;
     2713
     2714<a href="#message.headers" class="smpl">field-content</a> = *( WSP / VCHAR / obs-text )
     2715<a href="#message.headers" class="smpl">field-name</a> = token
     2716<a href="#message.headers" class="smpl">field-value</a> = *( field-content / OWS )
     2717<a href="#uri" class="smpl">fragment</a> = &lt;fragment, defined in [RFC3986], Section 3.5&gt;
     2718
     2719<a href="#general.header.fields" class="smpl">general-header</a> = Cache-Control / Connection / Date / Pragma / Trailer
     2720 / Transfer-Encoding / Upgrade / Via / Warning
     2721<a href="#message.types" class="smpl">generic-message</a> = start-line *( message-header CRLF ) CRLF [
     2722 message-body ]
     2723
     2724<a href="#http.uri" class="smpl">http-URI</a> = "http://" authority path-abempty [ "?" query ]
     2725
     2726l-Fri = %x46.72.69.64.61.79
     2727l-Mon = %x4D.6F.6E.64.61.79
     2728l-Sat = %x53.61.74.75.72.64.61.79
     2729l-Sun = %x53.75.6E.64.61.79
     2730l-Thu = %x54.68.75.72.73.64.61.79
     2731l-Tue = %x54.75.65.73.64.61.79
     2732l-Wed = %x57.65.64.6E.65.73.64.61.79
     2733<a href="#chunked.transfer.encoding" class="smpl">last-chunk</a> = 1*"0" *WSP [ chunk-ext ] CRLF
     2734
     2735<a href="#message.body" class="smpl">message-body</a> = entity-body / &lt;entity-body encoded as per
     2736 Transfer-Encoding&gt;
     2737<a href="#message.headers" class="smpl">message-header</a> = field-name ":" OWS [ field-value ] OWS
     2738<a href="#full.date" class="smpl">month</a> = s-Jan / s-Feb / s-Mar / s-Apr / s-May / s-Jun / s-Jul / s-Aug
     2739 / s-Sep / s-Oct / s-Nov / s-Dec
     2740
     2741<a href="#rule.whitespace" class="smpl">obs-fold</a> = CRLF
     2742<a href="#rule.quoted-string" class="smpl">obs-text</a> = %x80-FF
     2743<a href="#full.date" class="smpl">obsolete-date</a> = rfc850-date / asctime-date
     2744
     2745<a href="#transfer.codings" class="smpl">parameter</a> = attribute BWS "=" BWS value
     2746<a href="#uri" class="smpl">partial-URI</a> = relative-part [ "?" query ]
     2747<a href="#uri" class="smpl">path-abempty</a> = &lt;path-abempty, defined in [RFC3986], Section 3.3&gt;
     2748<a href="#uri" class="smpl">path-absolute</a> = &lt;path-absolute, defined in [RFC3986], Section 3.3&gt;
     2749<a href="#uri" class="smpl">port</a> = &lt;port, defined in [RFC3986], Section 3.2.3&gt;
     2750<a href="#product.tokens" class="smpl">product</a> = token [ "/" product-version ]
     2751<a href="#product.tokens" class="smpl">product-version</a> = token
     2752<a href="#header.via" class="smpl">protocol-name</a> = token
     2753<a href="#header.via" class="smpl">protocol-version</a> = token
     2754<a href="#header.via" class="smpl">pseudonym</a> = token
     2755
     2756<a href="#rule.quoted-string" class="smpl">qdtext</a> = *( OWS / "!" / %x23-5B / %x5D-7E / obs-text )
     2757<a href="#uri" class="smpl">query</a> = &lt;query, defined in [RFC3986], Section 3.4&gt;
     2758<a href="#rule.quoted-pair" class="smpl">quoted-pair</a> = "\" quoted-text
     2759<a href="#rule.quoted-string" class="smpl">quoted-string</a> = DQUOTE *( qdtext / quoted-pair ) DQUOTE
     2760<a href="#rule.quoted-pair" class="smpl">quoted-text</a> = %x01-09 / %x0B-0C / %x0E-FF
     2761
     2762<a href="#header.via" class="smpl">received-by</a> = ( uri-host [ ":" port ] ) / pseudonym
     2763<a href="#header.via" class="smpl">received-protocol</a> = [ protocol-name "/" ] protocol-version
     2764<a href="#uri" class="smpl">relative-part</a> = &lt;relative-part, defined in [RFC3986], Section 4.2&gt;
     2765<a href="#abnf.dependencies" class="smpl">request-header</a> = &lt;request-header, defined in [Part2], Section 3&gt;
     2766<a href="#request-target" class="smpl">request-target</a> = "*" / absolute-URI / ( path-absolute [ "?" query ] )
     2767 / authority
     2768<a href="#abnf.dependencies" class="smpl">response-header</a> = &lt;response-header, defined in [Part2], Section 5&gt;
     2769<a href="#full.date" class="smpl">rfc1123-date</a> = wkday "," SP date1 SP time SP GMT
     2770<a href="#full.date" class="smpl">rfc850-date</a> = weekday "," SP date2 SP time SP GMT
     2771
     2772s-Apr = %x41.70.72
     2773s-Aug = %x41.75.67
     2774s-Dec = %x44.65.63
     2775s-Feb = %x46.65.62
     2776s-Fri = %x46.72.69
     2777s-Jan = %x4A.61.6E
     2778s-Jul = %x4A.75.6C
     2779s-Jun = %x4A.75.6E
     2780s-Mar = %x4D.61.72
     2781s-May = %x4D.61.79
     2782s-Mon = %x4D.6F.6E
     2783s-Nov = %x4E.6F.76
     2784s-Oct = %x4F.63.74
     2785s-Sat = %x53.61.74
     2786s-Sep = %x53.65.70
     2787s-Sun = %x53.75.6E
     2788s-Thu = %x54.68.75
     2789s-Tue = %x54.75.65
     2790s-Wed = %x57.65.64
     2791<a href="#message.types" class="smpl">start-line</a> = Request-Line / Status-Line
     2792
     2793<a href="#header.te" class="smpl">t-codings</a> = "trailers" / ( transfer-extension [ accept-params ] )
     2794<a href="#rule.token.separators" class="smpl">tchar</a> = "!" / "#" / "$" / "%" / "&amp;" / "'" / "*" / "+" / "-" / "." /
     2795 "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
     2796<a href="#full.date" class="smpl">time</a> = 2DIGIT ":" 2DIGIT ":" 2DIGIT
     2797<a href="#rule.token.separators" class="smpl">token</a> = 1*tchar
     2798<a href="#chunked.transfer.encoding" class="smpl">trailer-part</a> = *( entity-header CRLF )
     2799<a href="#transfer.codings" class="smpl">transfer-coding</a> = "chunked" / transfer-extension
     2800<a href="#transfer.codings" class="smpl">transfer-extension</a> = token *( OWS ";" OWS parameter )
     2801
     2802<a href="#uri" class="smpl">uri-host</a> = &lt;host, defined in [RFC3986], Section 3.2.2&gt;
     2803
     2804<a href="#rule.parameter" class="smpl">value</a> = token / quoted-string
     2805
     2806<a href="#full.date" class="smpl">weekday</a> = l-Mon / l-Tue / l-Wed / l-Thu / l-Fri / l-Sat / l-Sun
     2807<a href="#full.date" class="smpl">wkday</a> = s-Mon / s-Tue / s-Wed / s-Thu / s-Fri / s-Sat / s-Sun
     2808
     2809; Chunked-Body defined but not used
     2810; Content-Length defined but not used
     2811; HTTP-message defined but not used
     2812; Host defined but not used
     2813; TE defined but not used
     2814; URI defined but not used
     2815; URI-reference defined but not used
     2816; fragment defined but not used
     2817; generic-message defined but not used
     2818; http-URI defined but not used
     2819; partial-URI defined but not used
     2820
     2821
     2822</pre> <h1 id="rfc.section.E"><a href="#rfc.section.E">E.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
     2823      <h2 id="rfc.section.E.1"><a href="#rfc.section.E.1">E.1</a>&nbsp;Since RFC2616
    26222824      </h2>
    2623       <p id="rfc.section.D.1.p.1">Extracted relevant partitions from <a href="#RFC2616" id="rfc.xref.RFC2616.3"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>.
    2624       </p>
    2625       <h2 id="rfc.section.D.2"><a href="#rfc.section.D.2">D.2</a>&nbsp;Since draft-ietf-httpbis-p1-messaging-00
     2825      <p id="rfc.section.E.1.p.1">Extracted relevant partitions from <a href="#RFC2616" id="rfc.xref.RFC2616.3"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>.
     2826      </p>
     2827      <h2 id="rfc.section.E.2"><a href="#rfc.section.E.2">E.2</a>&nbsp;Since draft-ietf-httpbis-p1-messaging-00
    26262828      </h2>
    2627       <p id="rfc.section.D.2.p.1">Closed issues: </p>
     2829      <p id="rfc.section.E.2.p.1">Closed issues: </p>
    26282830      <ul>
    26292831         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/1">http://tools.ietf.org/wg/httpbis/trac/ticket/1</a>&gt;: "HTTP Version should be case sensitive" (&lt;<a href="http://purl.org/NET/http-errata#verscase">http://purl.org/NET/http-errata#verscase</a>&gt;)
     
    26662868         </li>
    26672869      </ul>
    2668       <p id="rfc.section.D.2.p.2">Other changes: </p>
     2870      <p id="rfc.section.E.2.p.2">Other changes: </p>
    26692871      <ul>
    26702872         <li>Update media type registrations to use RFC4288 template.</li>
    2671          <li>Use names of RFC4234 core rules DQUOTE and HTAB, fix broken ABNF for chunk-data (work in progress on &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;)
     2873         <li>Use names of RFC4234 core rules DQUOTE and WSP, fix broken ABNF for chunk-data (work in progress on &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;)
    26722874         </li>
    26732875      </ul>
    2674       <h2 id="rfc.section.D.3"><a href="#rfc.section.D.3">D.3</a>&nbsp;Since draft-ietf-httpbis-p1-messaging-01
     2876      <h2 id="rfc.section.E.3"><a href="#rfc.section.E.3">E.3</a>&nbsp;Since draft-ietf-httpbis-p1-messaging-01
    26752877      </h2>
    2676       <p id="rfc.section.D.3.p.1">Closed issues: </p>
     2878      <p id="rfc.section.E.3.p.1">Closed issues: </p>
    26772879      <ul>
    26782880         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/19">http://tools.ietf.org/wg/httpbis/trac/ticket/19</a>&gt;: "Bodies on GET (and other) requests"
     
    26852887         </li>
    26862888      </ul>
    2687       <p id="rfc.section.D.3.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     2889      <p id="rfc.section.E.3.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    26882890      </p>
    26892891      <ul>
     
    26932895            -- these will have to be updated when switching over to RFC3986.
    26942896         </li>
    2695          <li>Synchronize core rules with RFC5234 (this includes a change to CHAR which now excludes NUL).</li>
     2897         <li>Synchronize core rules with RFC5234.</li>
    26962898         <li>Get rid of prose rules that span multiple lines.</li>
    26972899         <li>Get rid of unused rules LOALPHA and UPALPHA.</li>
     
    27002902         <li>Rewrite prose rule "token" in terms of "tchar", rewrite prose rule "TEXT".</li>
    27012903      </ul>
    2702       <h2 id="rfc.section.D.4"><a href="#rfc.section.D.4">D.4</a>&nbsp;<a id="changes.since.02" href="#changes.since.02">Since draft-ietf-httpbis-p1-messaging-02</a></h2>
    2703       <p id="rfc.section.D.4.p.1">Closed issues: </p>
     2904      <h2 id="rfc.section.E.4"><a href="#rfc.section.E.4">E.4</a>&nbsp;<a id="changes.since.02" href="#changes.since.02">Since draft-ietf-httpbis-p1-messaging-02</a></h2>
     2905      <p id="rfc.section.E.4.p.1">Closed issues: </p>
    27042906      <ul>
    27052907         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/51">http://tools.ietf.org/wg/httpbis/trac/ticket/51</a>&gt;: "HTTP-date vs. rfc1123-date"
     
    27082910         </li>
    27092911      </ul>
    2710       <p id="rfc.section.D.4.p.2">Ongoing work on IANA Message Header Registration (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/40">http://tools.ietf.org/wg/httpbis/trac/ticket/40</a>&gt;):
     2912      <p id="rfc.section.E.4.p.2">Ongoing work on IANA Message Header Registration (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/40">http://tools.ietf.org/wg/httpbis/trac/ticket/40</a>&gt;):
    27112913      </p>
    27122914      <ul>
    27132915         <li>Reference RFC 3984, and update header registrations for headers defined in this document.</li>
    27142916      </ul>
    2715       <p id="rfc.section.D.4.p.3">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     2917      <p id="rfc.section.E.4.p.3">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    27162918      </p>
    27172919      <ul>
    27182920         <li>Replace string literals when the string really is case-sensitive (HTTP-Version).</li>
    27192921      </ul>
    2720       <h2 id="rfc.section.D.5"><a href="#rfc.section.D.5">D.5</a>&nbsp;<a id="changes.since.03" href="#changes.since.03">Since draft-ietf-httpbis-p1-messaging-03</a></h2>
    2721       <p id="rfc.section.D.5.p.1">Closed issues: </p>
     2922      <h2 id="rfc.section.E.5"><a href="#rfc.section.E.5">E.5</a>&nbsp;<a id="changes.since.03" href="#changes.since.03">Since draft-ietf-httpbis-p1-messaging-03</a></h2>
     2923      <p id="rfc.section.E.5.p.1">Closed issues: </p>
    27222924      <ul>
    27232925         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/28">http://tools.ietf.org/wg/httpbis/trac/ticket/28</a>&gt;: "Connection closing"
     
    27342936         </li>
    27352937      </ul>
    2736       <p id="rfc.section.D.5.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     2938      <p id="rfc.section.E.5.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    27372939      </p>
    27382940      <ul>
     
    27402942         <li>Replace HEX by HEXDIG for future consistence with RFC 5234's core rules.</li>
    27412943      </ul>
    2742       <h2 id="rfc.section.D.6"><a href="#rfc.section.D.6">D.6</a>&nbsp;<a id="changes.since.04" href="#changes.since.04">Since draft-ietf-httpbis-p1-messaging-04</a></h2>
    2743       <p id="rfc.section.D.6.p.1">Closed issues: </p>
     2944      <h2 id="rfc.section.E.6"><a href="#rfc.section.E.6">E.6</a>&nbsp;<a id="changes.since.04" href="#changes.since.04">Since draft-ietf-httpbis-p1-messaging-04</a></h2>
     2945      <p id="rfc.section.E.6.p.1">Closed issues: </p>
    27442946      <ul>
    27452947         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/34">http://tools.ietf.org/wg/httpbis/trac/ticket/34</a>&gt;: "Out-of-date reference for URIs"
     
    27482950         </li>
    27492951      </ul>
    2750       <p id="rfc.section.D.6.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     2952      <p id="rfc.section.E.6.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    27512953      </p>
    27522954      <ul>
     
    27572959         <li>Rewrite ABNFs to spell out whitespace rules, factor out header value format definitions.</li>
    27582960      </ul>
    2759       <h2 id="rfc.section.D.7"><a href="#rfc.section.D.7">D.7</a>&nbsp;<a id="changes.since.05" href="#changes.since.05">Since draft-ietf-httpbis-p1-messaging-05</a></h2>
    2760       <p id="rfc.section.D.7.p.1">Closed issues: </p>
     2961      <h2 id="rfc.section.E.7"><a href="#rfc.section.E.7">E.7</a>&nbsp;<a id="changes.since.05" href="#changes.since.05">Since draft-ietf-httpbis-p1-messaging-05</a></h2>
     2962      <p id="rfc.section.E.7.p.1">Closed issues: </p>
    27612963      <ul>
     2964         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/30">http://tools.ietf.org/wg/httpbis/trac/ticket/30</a>&gt;: "Header LWS"
     2965         </li>
     2966         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/52">http://tools.ietf.org/wg/httpbis/trac/ticket/52</a>&gt;: "Sort 1.3 Terminology"
     2967         </li>
     2968         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/63">http://tools.ietf.org/wg/httpbis/trac/ticket/63</a>&gt;: "RFC2047 encoded words"
     2969         </li>
     2970         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/74">http://tools.ietf.org/wg/httpbis/trac/ticket/74</a>&gt;: "Character Encodings in TEXT"
     2971         </li>
     2972         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/77">http://tools.ietf.org/wg/httpbis/trac/ticket/77</a>&gt;: "Line Folding"
     2973         </li>
     2974         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/83">http://tools.ietf.org/wg/httpbis/trac/ticket/83</a>&gt;: "OPTIONS * and proxies"
     2975         </li>
     2976         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/94">http://tools.ietf.org/wg/httpbis/trac/ticket/94</a>&gt;: "Reason-Phrase BNF"
     2977         </li>
     2978         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/111">http://tools.ietf.org/wg/httpbis/trac/ticket/111</a>&gt;: "Use of TEXT"
     2979         </li>
    27622980         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/118">http://tools.ietf.org/wg/httpbis/trac/ticket/118</a>&gt;: "Join "Differences Between HTTP Entities and RFC 2045 Entities"?"
    27632981         </li>
    27642982         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/134">http://tools.ietf.org/wg/httpbis/trac/ticket/134</a>&gt;: "RFC822 reference left in discussion of date formats"
    27652983         </li>
     2984      </ul>
     2985      <p id="rfc.section.E.7.p.2">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     2986      </p>
     2987      <ul>
     2988         <li>Rewrite definition of list rules, deprecate empty list elements.</li>
     2989         <li>Add appendix containing collected and expanded ABNF.</li>
     2990      </ul>
     2991      <p id="rfc.section.E.7.p.3">Other changes: </p>
     2992      <ul>
     2993         <li>Rewrite introduction; add mostly new Architecture Section.</li>
    27662994      </ul>
    27672995      <h1><a id="rfc.copyright" href="#rfc.copyright">Full Copyright Statement</a></h1>
     
    27993027            </li>
    28003028            <li class="indline0"><a id="rfc.index.C" href="#rfc.index.C"><b>C</b></a><ul class="ind">
    2801                   <li class="indline1">cache&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.6">C</a></li>
    2802                   <li class="indline1">cacheable&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.7">C</a></li>
     3029                  <li class="indline1">cache&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.3">C</a></li>
     3030                  <li class="indline1">cacheable&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.4">C</a></li>
    28033031                  <li class="indline1">client&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.5">C</a></li>
    2804                   <li class="indline1">connection&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.3">C</a></li>
     3032                  <li class="indline1">connection&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.6">C</a></li>
    28053033                  <li class="indline1">Connection header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.connection.1">4.5</a>, <a class="iref" href="#rfc.xref.header.connection.2">7.1.2</a>, <a class="iref" href="#rfc.xref.header.connection.3">7.1.3</a>, <a class="iref" href="#rfc.iref.c.1"><b>8.1</b></a>, <a class="iref" href="#rfc.xref.header.connection.4">8.5</a>, <a class="iref" href="#rfc.xref.header.connection.5">8.8</a>, <a class="iref" href="#rfc.xref.header.connection.6">9.1</a>, <a class="iref" href="#rfc.xref.header.connection.7">B.2</a>, <a class="iref" href="#rfc.xref.header.connection.8">B.4</a></li>
    2806                   <li class="indline1">content negotiation&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.4">C</a></li>
     3034                  <li class="indline1">content negotiation&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.7">C</a></li>
    28073035                  <li class="indline1">Content-Length header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-length.1">4.4</a>, <a class="iref" href="#rfc.iref.c.2"><b>8.2</b></a>, <a class="iref" href="#rfc.xref.header.content-length.2">9.1</a>, <a class="iref" href="#rfc.xref.header.content-length.3">B.3</a></li>
    28083036               </ul>
     
    28183046            </li>
    28193047            <li class="indline0"><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul class="ind">
    2820                   <li class="indline1">gateway&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.108">C</a></li>
     3048                  <li class="indline1">gateway&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.107">C</a></li>
    28213049                  <li class="indline1"><tt>Grammar</tt>&nbsp;&nbsp;
    28223050                     <ul class="ind">
    2823                         <li class="indline1"><tt>absolute-URI</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.27"><b>2.1</b></a></li>
     3051                        <li class="indline1"><tt>absolute-URI</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.24"><b>2.1</b></a></li>
    28243052                        <li class="indline1">ALPHA&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.1"><b>1.2</b></a></li>
    2825                         <li class="indline1"><tt>asctime-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.40"><b>3.2.1</b></a></li>
    2826                         <li class="indline1"><tt>attribute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.51"><b>3.3</b></a></li>
    2827                         <li class="indline1"><tt>authority</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.28"><b>2.1</b></a></li>
    2828                         <li class="indline1"><tt>BWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.16"><b>1.2.2</b></a></li>
    2829                         <li class="indline1">CHAR&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>1.2</b></a></li>
    2830                         <li class="indline1"><tt>chunk</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.54"><b>3.3.1</b></a></li>
    2831                         <li class="indline1"><tt>chunk-data</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.60"><b>3.3.1</b></a></li>
    2832                         <li class="indline1"><tt>chunk-ext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.57"><b>3.3.1</b></a></li>
    2833                         <li class="indline1"><tt>chunk-ext-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.58"><b>3.3.1</b></a></li>
    2834                         <li class="indline1"><tt>chunk-ext-val</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.59"><b>3.3.1</b></a></li>
    2835                         <li class="indline1"><tt>chunk-size</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.55"><b>3.3.1</b></a></li>
    2836                         <li class="indline1"><tt>Chunked-Body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.53"><b>3.3.1</b></a></li>
    2837                         <li class="indline1"><tt>comment</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.20"><b>1.2.2</b></a></li>
    2838                         <li class="indline1"><tt>Connection</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.83"><b>8.1</b></a></li>
    2839                         <li class="indline1"><tt>connection-token</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.85"><b>8.1</b></a></li>
    2840                         <li class="indline1"><tt>Connection-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.84"><b>8.1</b></a></li>
    2841                         <li class="indline1"><tt>Content-Length</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.86"><b>8.2</b></a></li>
    2842                         <li class="indline1"><tt>Content-Length-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.87"><b>8.2</b></a></li>
    2843                         <li class="indline1">CR&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3"><b>1.2</b></a></li>
    2844                         <li class="indline1">CRLF&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>1.2</b></a></li>
    2845                         <li class="indline1"><tt>ctext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.21"><b>1.2.2</b></a></li>
    2846                         <li class="indline1">CTL&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>1.2</b></a></li>
    2847                         <li class="indline1"><tt>Date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.88"><b>8.3</b></a></li>
    2848                         <li class="indline1"><tt>Date-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.89"><b>8.3</b></a></li>
    2849                         <li class="indline1"><tt>date1</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.41"><b>3.2.1</b></a></li>
    2850                         <li class="indline1"><tt>date2</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.42"><b>3.2.1</b></a></li>
    2851                         <li class="indline1"><tt>date3</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.43"><b>3.2.1</b></a></li>
    2852                         <li class="indline1">DIGIT&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>1.2</b></a></li>
    2853                         <li class="indline1">DQUOTE&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>1.2</b></a></li>
    2854                         <li class="indline1"><tt>extension-code</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.81"><b>6.1.1</b></a></li>
    2855                         <li class="indline1"><tt>extension-method</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.76"><b>5.1.1</b></a></li>
    2856                         <li class="indline1"><tt>field-content</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.70"><b>4.2</b></a></li>
    2857                         <li class="indline1"><tt>field-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.68"><b>4.2</b></a></li>
    2858                         <li class="indline1"><tt>field-value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.69"><b>4.2</b></a></li>
    2859                         <li class="indline1"><tt>general-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.72"><b>4.5</b></a></li>
    2860                         <li class="indline1"><tt>generic-message</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.65"><b>4.1</b></a></li>
    2861                         <li class="indline1">HEXDIG&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>1.2</b></a></li>
    2862                         <li class="indline1"><tt>Host</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.90"><b>8.4</b></a></li>
    2863                         <li class="indline1"><tt>Host-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.91"><b>8.4</b></a></li>
    2864                         <li class="indline1">HTAB&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>1.2</b></a></li>
    2865                         <li class="indline1"><tt>HTTP-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.36"><b>3.2.1</b></a></li>
    2866                         <li class="indline1"><tt>HTTP-message</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.64"><b>4.1</b></a></li>
    2867                         <li class="indline1"><tt>HTTP-Prot-Name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.35"><b>3.1</b></a></li>
    2868                         <li class="indline1"><tt>http-URI</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.33"><b>2.1.1</b></a></li>
    2869                         <li class="indline1"><tt>HTTP-Version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.34"><b>3.1</b></a></li>
    2870                         <li class="indline1"><tt>last-chunk</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.56"><b>3.3.1</b></a></li>
    2871                         <li class="indline1">LF&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.10"><b>1.2</b></a></li>
    2872                         <li class="indline1"><tt>message-body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.71"><b>4.3</b></a></li>
    2873                         <li class="indline1"><tt>message-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.67"><b>4.2</b></a></li>
    2874                         <li class="indline1"><tt>Method</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.75"><b>5.1.1</b></a></li>
    2875                         <li class="indline1"><tt>month</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.47"><b>3.2.1</b></a></li>
    2876                         <li class="indline1"><tt>obsolete-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.38"><b>3.2.1</b></a></li>
    2877                         <li class="indline1">OCTET&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.11"><b>1.2</b></a></li>
    2878                         <li class="indline1"><tt>OWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.14"><b>1.2.2</b></a></li>
    2879                         <li class="indline1"><tt>parameter</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.50"><b>3.3</b></a></li>
    2880                         <li class="indline1"><tt>path-absolute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.29"><b>2.1</b></a></li>
    2881                         <li class="indline1"><tt>port</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.30"><b>2.1</b></a></li>
    2882                         <li class="indline1"><tt>product</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.62"><b>3.4</b></a></li>
    2883                         <li class="indline1"><tt>product-version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.63"><b>3.4</b></a></li>
    2884                         <li class="indline1"><tt>protocol-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.104"><b>8.9</b></a></li>
    2885                         <li class="indline1"><tt>protocol-version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.105"><b>8.9</b></a></li>
    2886                         <li class="indline1"><tt>pseudonym</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.107"><b>8.9</b></a></li>
    2887                         <li class="indline1"><tt>qdtext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.23"><b>1.2.2</b></a></li>
    2888                         <li class="indline1"><tt>query</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.31"><b>2.1</b></a></li>
    2889                         <li class="indline1"><tt>quoted-pair</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.25"><b>1.2.2</b></a></li>
    2890                         <li class="indline1"><tt>quoted-string</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.22"><b>1.2.2</b></a></li>
    2891                         <li class="indline1"><tt>quoted-text</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.24"><b>1.2.2</b></a></li>
    2892                         <li class="indline1"><tt>Reason-Phrase</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.82"><b>6.1.1</b></a></li>
    2893                         <li class="indline1"><tt>received-by</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.106"><b>8.9</b></a></li>
    2894                         <li class="indline1"><tt>received-protocol</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.103"><b>8.9</b></a></li>
    2895                         <li class="indline1"><tt>Request</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.73"><b>5</b></a></li>
    2896                         <li class="indline1"><tt>Request-Line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.74"><b>5.1</b></a></li>
    2897                         <li class="indline1"><tt>request-target</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.77"><b>5.1.2</b></a></li>
    2898                         <li class="indline1"><tt>Response</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.78"><b>6</b></a></li>
    2899                         <li class="indline1"><tt>rfc1123-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.37"><b>3.2.1</b></a></li>
    2900                         <li class="indline1"><tt>rfc850-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.39"><b>3.2.1</b></a></li>
    2901                         <li class="indline1"><tt>RWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.15"><b>1.2.2</b></a></li>
    2902                         <li class="indline1">SP&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.12"><b>1.2</b></a></li>
    2903                         <li class="indline1"><tt>start-line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.66"><b>4.1</b></a></li>
    2904                         <li class="indline1"><tt>Status-Code</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.80"><b>6.1.1</b></a></li>
    2905                         <li class="indline1"><tt>Status-Line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.79"><b>6.1</b></a></li>
    2906                         <li class="indline1"><tt>t-codings</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.94"><b>8.5</b></a></li>
    2907                         <li class="indline1"><tt>tchar</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.19"><b>1.2.2</b></a></li>
    2908                         <li class="indline1"><tt>TE</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.92"><b>8.5</b></a></li>
    2909                         <li class="indline1"><tt>TE-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.93"><b>8.5</b></a></li>
    2910                         <li class="indline1"><tt>TEXT</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.17"><b>1.2.2</b></a></li>
    2911                         <li class="indline1"><tt>time</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.44"><b>3.2.1</b></a></li>
    2912                         <li class="indline1"><tt>token</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.18"><b>1.2.2</b></a></li>
    2913                         <li class="indline1"><tt>Trailer</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.95"><b>8.6</b></a></li>
    2914                         <li class="indline1"><tt>trailer-part</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.61"><b>3.3.1</b></a></li>
    2915                         <li class="indline1"><tt>Trailer-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.96"><b>8.6</b></a></li>
    2916                         <li class="indline1"><tt>transfer-coding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.48"><b>3.3</b></a></li>
    2917                         <li class="indline1"><tt>Transfer-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.97"><b>8.7</b></a></li>
    2918                         <li class="indline1"><tt>Transfer-Encoding-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.98"><b>8.7</b></a></li>
    2919                         <li class="indline1"><tt>transfer-extension</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.49"><b>3.3</b></a></li>
    2920                         <li class="indline1"><tt>Upgrade</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.99"><b>8.8</b></a></li>
    2921                         <li class="indline1"><tt>Upgrade-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.100"><b>8.8</b></a></li>
    2922                         <li class="indline1"><tt>uri-host</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.32"><b>2.1</b></a></li>
    2923                         <li class="indline1"><tt>URI-reference</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.26"><b>2.1</b></a></li>
    2924                         <li class="indline1"><tt>value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.52"><b>3.3</b></a></li>
    2925                         <li class="indline1"><tt>Via</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.101"><b>8.9</b></a></li>
    2926                         <li class="indline1"><tt>Via-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.102"><b>8.9</b></a></li>
    2927                         <li class="indline1"><tt>weekday</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.46"><b>3.2.1</b></a></li>
    2928                         <li class="indline1"><tt>wkday</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.45"><b>3.2.1</b></a></li>
    2929                         <li class="indline1">WSP&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.13"><b>1.2</b></a></li>
     3053                        <li class="indline1"><tt>asctime-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.37"><b>3.2.1</b></a></li>
     3054                        <li class="indline1"><tt>attribute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.48"><b>3.3</b></a></li>
     3055                        <li class="indline1"><tt>authority</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.25"><b>2.1</b></a></li>
     3056                        <li class="indline1"><tt>BWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.15"><b>1.2.2</b></a></li>
     3057                        <li class="indline1"><tt>chunk</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.51"><b>3.3.1</b></a></li>
     3058                        <li class="indline1"><tt>chunk-data</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.57"><b>3.3.1</b></a></li>
     3059                        <li class="indline1"><tt>chunk-ext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.54"><b>3.3.1</b></a></li>
     3060                        <li class="indline1"><tt>chunk-ext-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.55"><b>3.3.1</b></a></li>
     3061                        <li class="indline1"><tt>chunk-ext-val</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.56"><b>3.3.1</b></a></li>
     3062                        <li class="indline1"><tt>chunk-size</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.52"><b>3.3.1</b></a></li>
     3063                        <li class="indline1"><tt>Chunked-Body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.50"><b>3.3.1</b></a></li>
     3064                        <li class="indline1"><tt>comment</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.68"><b>4.2</b></a></li>
     3065                        <li class="indline1"><tt>Connection</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.82"><b>8.1</b></a></li>
     3066                        <li class="indline1"><tt>connection-token</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.84"><b>8.1</b></a></li>
     3067                        <li class="indline1"><tt>Connection-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.83"><b>8.1</b></a></li>
     3068                        <li class="indline1"><tt>Content-Length</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.85"><b>8.2</b></a></li>
     3069                        <li class="indline1"><tt>Content-Length-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.86"><b>8.2</b></a></li>
     3070                        <li class="indline1">CR&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>1.2</b></a></li>
     3071                        <li class="indline1">CRLF&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3"><b>1.2</b></a></li>
     3072                        <li class="indline1"><tt>ctext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.69"><b>4.2</b></a></li>
     3073                        <li class="indline1">CTL&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>1.2</b></a></li>
     3074                        <li class="indline1"><tt>Date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.87"><b>8.3</b></a></li>
     3075                        <li class="indline1"><tt>Date-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.88"><b>8.3</b></a></li>
     3076                        <li class="indline1"><tt>date1</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.38"><b>3.2.1</b></a></li>
     3077                        <li class="indline1"><tt>date2</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.39"><b>3.2.1</b></a></li>
     3078                        <li class="indline1"><tt>date3</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.40"><b>3.2.1</b></a></li>
     3079                        <li class="indline1">DIGIT&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>1.2</b></a></li>
     3080                        <li class="indline1">DQUOTE&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>1.2</b></a></li>
     3081                        <li class="indline1"><tt>extension-code</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.80"><b>6.1.1</b></a></li>
     3082                        <li class="indline1"><tt>extension-method</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.75"><b>5.1.1</b></a></li>
     3083                        <li class="indline1"><tt>field-content</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.67"><b>4.2</b></a></li>
     3084                        <li class="indline1"><tt>field-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.65"><b>4.2</b></a></li>
     3085                        <li class="indline1"><tt>field-value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.66"><b>4.2</b></a></li>
     3086                        <li class="indline1"><tt>general-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.71"><b>4.5</b></a></li>
     3087                        <li class="indline1"><tt>generic-message</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.62"><b>4.1</b></a></li>
     3088                        <li class="indline1">HEXDIG&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>1.2</b></a></li>
     3089                        <li class="indline1"><tt>Host</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.89"><b>8.4</b></a></li>
     3090                        <li class="indline1"><tt>Host-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.90"><b>8.4</b></a></li>
     3091                        <li class="indline1"><tt>HTTP-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.33"><b>3.2.1</b></a></li>
     3092                        <li class="indline1"><tt>HTTP-message</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.61"><b>4.1</b></a></li>
     3093                        <li class="indline1"><tt>HTTP-Prot-Name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.32"><b>3.1</b></a></li>
     3094                        <li class="indline1"><tt>http-URI</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.30"><b>2.1.1</b></a></li>
     3095                        <li class="indline1"><tt>HTTP-Version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.31"><b>3.1</b></a></li>
     3096                        <li class="indline1"><tt>last-chunk</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.53"><b>3.3.1</b></a></li>
     3097                        <li class="indline1">LF&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>1.2</b></a></li>
     3098                        <li class="indline1"><tt>message-body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.70"><b>4.3</b></a></li>
     3099                        <li class="indline1"><tt>message-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.64"><b>4.2</b></a></li>
     3100                        <li class="indline1"><tt>Method</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.74"><b>5.1.1</b></a></li>
     3101                        <li class="indline1"><tt>month</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.44"><b>3.2.1</b></a></li>
     3102                        <li class="indline1"><tt>obs-text</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.20"><b>1.2.2</b></a></li>
     3103                        <li class="indline1"><tt>obsolete-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.35"><b>3.2.1</b></a></li>
     3104                        <li class="indline1">OCTET&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>1.2</b></a></li>
     3105                        <li class="indline1"><tt>OWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.13"><b>1.2.2</b></a></li>
     3106                        <li class="indline1"><tt>parameter</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.47"><b>3.3</b></a></li>
     3107                        <li class="indline1"><tt>path-absolute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.26"><b>2.1</b></a></li>
     3108                        <li class="indline1"><tt>port</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.27"><b>2.1</b></a></li>
     3109                        <li class="indline1"><tt>product</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.59"><b>3.4</b></a></li>
     3110                        <li class="indline1"><tt>product-version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.60"><b>3.4</b></a></li>
     3111                        <li class="indline1"><tt>protocol-name</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.103"><b>8.9</b></a></li>
     3112                        <li class="indline1"><tt>protocol-version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.104"><b>8.9</b></a></li>
     3113                        <li class="indline1"><tt>pseudonym</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.106"><b>8.9</b></a></li>
     3114                        <li class="indline1"><tt>qdtext</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.19"><b>1.2.2</b></a></li>
     3115                        <li class="indline1"><tt>query</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.28"><b>2.1</b></a></li>
     3116                        <li class="indline1"><tt>quoted-pair</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.22"><b>1.2.2</b></a></li>
     3117                        <li class="indline1"><tt>quoted-string</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.18"><b>1.2.2</b></a></li>
     3118                        <li class="indline1"><tt>quoted-text</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.21"><b>1.2.2</b></a></li>
     3119                        <li class="indline1"><tt>Reason-Phrase</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.81"><b>6.1.1</b></a></li>
     3120                        <li class="indline1"><tt>received-by</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.105"><b>8.9</b></a></li>
     3121                        <li class="indline1"><tt>received-protocol</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.102"><b>8.9</b></a></li>
     3122                        <li class="indline1"><tt>Request</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.72"><b>5</b></a></li>
     3123                        <li class="indline1"><tt>Request-Line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.73"><b>5.1</b></a></li>
     3124                        <li class="indline1"><tt>request-target</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.76"><b>5.1.2</b></a></li>
     3125                        <li class="indline1"><tt>Response</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.77"><b>6</b></a></li>
     3126                        <li class="indline1"><tt>rfc1123-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.34"><b>3.2.1</b></a></li>
     3127                        <li class="indline1"><tt>rfc850-date</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.36"><b>3.2.1</b></a></li>
     3128                        <li class="indline1"><tt>RWS</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.14"><b>1.2.2</b></a></li>
     3129                        <li class="indline1">SP&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.10"><b>1.2</b></a></li>
     3130                        <li class="indline1"><tt>start-line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.63"><b>4.1</b></a></li>
     3131                        <li class="indline1"><tt>Status-Code</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.79"><b>6.1.1</b></a></li>
     3132                        <li class="indline1"><tt>Status-Line</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.78"><b>6.1</b></a></li>
     3133                        <li class="indline1"><tt>t-codings</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.93"><b>8.5</b></a></li>
     3134                        <li class="indline1"><tt>tchar</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.17"><b>1.2.2</b></a></li>
     3135                        <li class="indline1"><tt>TE</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.91"><b>8.5</b></a></li>
     3136                        <li class="indline1"><tt>TE-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.92"><b>8.5</b></a></li>
     3137                        <li class="indline1"><tt>time</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.41"><b>3.2.1</b></a></li>
     3138                        <li class="indline1"><tt>token</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.16"><b>1.2.2</b></a></li>
     3139                        <li class="indline1"><tt>Trailer</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.94"><b>8.6</b></a></li>
     3140                        <li class="indline1"><tt>trailer-part</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.58"><b>3.3.1</b></a></li>
     3141                        <li class="indline1"><tt>Trailer-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.95"><b>8.6</b></a></li>
     3142                        <li class="indline1"><tt>transfer-coding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.45"><b>3.3</b></a></li>
     3143                        <li class="indline1"><tt>Transfer-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.96"><b>8.7</b></a></li>
     3144                        <li class="indline1"><tt>Transfer-Encoding-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.97"><b>8.7</b></a></li>
     3145                        <li class="indline1"><tt>transfer-extension</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.46"><b>3.3</b></a></li>
     3146                        <li class="indline1"><tt>Upgrade</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.98"><b>8.8</b></a></li>
     3147                        <li class="indline1"><tt>Upgrade-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.99"><b>8.8</b></a></li>
     3148                        <li class="indline1"><tt>uri-host</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.29"><b>2.1</b></a></li>
     3149                        <li class="indline1"><tt>URI-reference</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.23"><b>2.1</b></a></li>
     3150                        <li class="indline1"><tt>value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.49"><b>3.3</b></a></li>
     3151                        <li class="indline1">VCHAR&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.11"><b>1.2</b></a></li>
     3152                        <li class="indline1"><tt>Via</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.100"><b>8.9</b></a></li>
     3153                        <li class="indline1"><tt>Via-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.101"><b>8.9</b></a></li>
     3154                        <li class="indline1"><tt>weekday</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.43"><b>3.2.1</b></a></li>
     3155                        <li class="indline1"><tt>wkday</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.42"><b>3.2.1</b></a></li>
     3156                        <li class="indline1">WSP&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.12"><b>1.2</b></a></li>
    29303157                     </ul>
    29313158                  </li>
     
    29523179            </li>
    29533180            <li class="indline0"><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul class="ind">
    2954                   <li class="indline1">implied *LWS&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.1"><b>1.2.1.2</b></a></li>
    2955                   <li class="indline1">inbound&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.2">C</a></li>
    2956                   <li class="indline1"><em>ISO-8859-1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.ISO-8859-1.1">1.2.2</a>, <a class="iref" href="#ISO-8859-1"><b>12.1</b></a></li>
     3181                  <li class="indline1">inbound&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.1">C</a></li>
     3182                  <li class="indline1"><em>ISO-8859-1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.ISO-8859-1.1">4.2</a>, <a class="iref" href="#ISO-8859-1"><b>12.1</b></a></li>
    29573183               </ul>
    29583184            </li>
     
    29773203            </li>
    29783204            <li class="indline0"><a id="rfc.index.O" href="#rfc.index.O"><b>O</b></a><ul class="ind">
    2979                   <li class="indline1">origin server&nbsp;&nbsp;<a class="iref" href="#rfc.iref.o.1">C</a></li>
    2980                   <li class="indline1">outbound&nbsp;&nbsp;<a class="iref" href="#rfc.iref.o.2">C</a></li>
     3205                  <li class="indline1">origin server&nbsp;&nbsp;<a class="iref" href="#rfc.iref.o.2">C</a></li>
     3206                  <li class="indline1">outbound&nbsp;&nbsp;<a class="iref" href="#rfc.iref.o.1">C</a></li>
    29813207               </ul>
    29823208            </li>
    29833209            <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind">
    29843210                  <li class="indline1"><em>Pad1995</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Pad1995.1">7.1.1</a>, <a class="iref" href="#Pad1995"><b>12.2</b></a></li>
    2985                   <li class="indline1"><em>Part2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.3">4.2</a>, <a class="iref" href="#rfc.xref.Part2.4">4.2</a>, <a class="iref" href="#rfc.xref.Part2.5">4.3</a>, <a class="iref" href="#rfc.xref.Part2.6">5</a>, <a class="iref" href="#rfc.xref.Part2.7">5.1.2</a>, <a class="iref" href="#rfc.xref.Part2.8">5.1.2</a>, <a class="iref" href="#rfc.xref.Part2.9">6</a>, <a class="iref" href="#rfc.xref.Part2.10">6.1.1</a>, <a class="iref" href="#rfc.xref.Part2.11">7.1.2.2</a>, <a class="iref" href="#rfc.xref.Part2.12">7.1.4</a>, <a class="iref" href="#rfc.xref.Part2.13">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.14">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.15">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.16">7.2.3</a>, <a class="iref" href="#Part2"><b>12.1</b></a><ul class="ind">
    2986                         <li class="indline1"><em>Section 3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.5">4.3</a></li>
    2987                         <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.3">4.2</a>, <a class="iref" href="#rfc.xref.Part2.6">5</a></li>
    2988                         <li class="indline1"><em>Section 6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.4">4.2</a>, <a class="iref" href="#rfc.xref.Part2.9">6</a></li>
    2989                         <li class="indline1"><em>Section 8.1.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.11">7.1.2.2</a>, <a class="iref" href="#rfc.xref.Part2.12">7.1.4</a></li>
    2990                         <li class="indline1"><em>Section 8.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.7">5.1.2</a></li>
    2991                         <li class="indline1"><em>Section 9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.10">6.1.1</a></li>
    2992                         <li class="indline1"><em>Section 9.1.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.13">7.2.3</a></li>
    2993                         <li class="indline1"><em>Section 9.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.16">7.2.3</a></li>
    2994                         <li class="indline1"><em>Section 9.4.15</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.8">5.1.2</a></li>
    2995                         <li class="indline1"><em>Section 10.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.14">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.15">7.2.3</a></li>
     3211                  <li class="indline1"><em>Part2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.3">4.3</a>, <a class="iref" href="#rfc.xref.Part2.4">5</a>, <a class="iref" href="#rfc.xref.Part2.5">5.1.2</a>, <a class="iref" href="#rfc.xref.Part2.6">5.1.2</a>, <a class="iref" href="#rfc.xref.Part2.7">6</a>, <a class="iref" href="#rfc.xref.Part2.8">6.1.1</a>, <a class="iref" href="#rfc.xref.Part2.9">7.1.2.2</a>, <a class="iref" href="#rfc.xref.Part2.10">7.1.4</a>, <a class="iref" href="#rfc.xref.Part2.11">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.12">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.13">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.14">7.2.3</a>, <a class="iref" href="#Part2"><b>12.1</b></a><ul class="ind">
     3212                        <li class="indline1"><em>Section 2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.3">4.3</a></li>
     3213                        <li class="indline1"><em>Section 3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.4">5</a></li>
     3214                        <li class="indline1"><em>Section 5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part2.7">6</a></li>
     3215                        <li class="indline1"><em>Section 7.1.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.9">7.1.2.2</a>, <a class="iref" href="#rfc.xref.Part2.10">7.1.4</a></li>
     3216                        <li class="indline1"><em>Section 7.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.5">5.1.2</a></li>
     3217                        <li class="indline1"><em>Section 8</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.8">6.1.1</a></li>
     3218                        <li class="indline1"><em>Section 8.1.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.11">7.2.3</a></li>
     3219                        <li class="indline1"><em>Section 8.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.14">7.2.3</a></li>
     3220                        <li class="indline1"><em>Section 8.4.15</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.6">5.1.2</a></li>
     3221                        <li class="indline1"><em>Section 9.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.12">7.2.3</a>, <a class="iref" href="#rfc.xref.Part2.13">7.2.3</a></li>
    29963222                     </ul>
    29973223                  </li>
    2998                   <li class="indline1"><em>Part3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a>, <a class="iref" href="#rfc.xref.Part3.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part3.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.4">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.5">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.6">3.3</a>, <a class="iref" href="#rfc.xref.Part3.7">3.3</a>, <a class="iref" href="#rfc.xref.Part3.8">4.2</a>, <a class="iref" href="#rfc.xref.Part3.9">5</a>, <a class="iref" href="#rfc.xref.Part3.10">6</a>, <a class="iref" href="#rfc.xref.Part3.11">8.5</a>, <a class="iref" href="#Part3"><b>12.1</b></a>, <a class="iref" href="#rfc.xref.Part3.12">A</a>, <a class="iref" href="#rfc.xref.Part3.13">B.3</a>, <a class="iref" href="#rfc.xref.Part3.14">C</a>, <a class="iref" href="#rfc.xref.Part3.15">C</a>, <a class="iref" href="#rfc.xref.Part3.16">C</a><ul class="ind">
    2999                         <li class="indline1"><em>Section 3.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.6">3.3</a>, <a class="iref" href="#rfc.xref.Part3.7">3.3</a></li>
    3000                         <li class="indline1"><em>Section 3.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.2">1.2.2</a></li>
    3001                         <li class="indline1"><em>Section 3.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.11">8.5</a></li>
    3002                         <li class="indline1"><em>Section 4.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.5">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.8">4.2</a>, <a class="iref" href="#rfc.xref.Part3.9">5</a>, <a class="iref" href="#rfc.xref.Part3.10">6</a></li>
    3003                         <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.14">C</a></li>
    3004                         <li class="indline1"><em>Section 4.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.4">1.2.3</a></li>
    3005                         <li class="indline1"><em>Section 5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.15">C</a>, <a class="iref" href="#rfc.xref.Part3.16">C</a></li>
    3006                         <li class="indline1"><em>Section 6.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.3">1.2.3</a></li>
     3224                  <li class="indline1"><em>Part3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a>, <a class="iref" href="#rfc.xref.Part3.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part3.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.4">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.5">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.6">3.3</a>, <a class="iref" href="#rfc.xref.Part3.7">3.3</a>, <a class="iref" href="#rfc.xref.Part3.8">5</a>, <a class="iref" href="#rfc.xref.Part3.9">6</a>, <a class="iref" href="#rfc.xref.Part3.10">8.5</a>, <a class="iref" href="#Part3"><b>12.1</b></a>, <a class="iref" href="#rfc.xref.Part3.11">A</a>, <a class="iref" href="#rfc.xref.Part3.12">B.3</a>, <a class="iref" href="#rfc.xref.Part3.13">C</a>, <a class="iref" href="#rfc.xref.Part3.14">C</a>, <a class="iref" href="#rfc.xref.Part3.15">C</a><ul class="ind">
     3225                        <li class="indline1"><em>Section 2.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.6">3.3</a>, <a class="iref" href="#rfc.xref.Part3.7">3.3</a></li>
     3226                        <li class="indline1"><em>Section 2.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.2">1.2.2</a></li>
     3227                        <li class="indline1"><em>Section 2.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.10">8.5</a></li>
     3228                        <li class="indline1"><em>Section 3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.5">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.8">5</a>, <a class="iref" href="#rfc.xref.Part3.9">6</a></li>
     3229                        <li class="indline1"><em>Section 3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.14">C</a></li>
     3230                        <li class="indline1"><em>Section 3.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.4">1.2.3</a></li>
     3231                        <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.13">C</a>, <a class="iref" href="#rfc.xref.Part3.15">C</a></li>
     3232                        <li class="indline1"><em>Section 5.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.3">1.2.3</a></li>
    30073233                        <li class="indline1"><em>Appendix A</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a></li>
    30083234                     </ul>
     
    30113237                  <li class="indline1"><em>Part6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.4">2.2</a>, <a class="iref" href="#rfc.xref.Part6.5">4.5</a>, <a class="iref" href="#rfc.xref.Part6.6">4.5</a>, <a class="iref" href="#rfc.xref.Part6.7">4.5</a>, <a class="iref" href="#Part6"><b>12.1</b></a>, <a class="iref" href="#rfc.xref.Part6.8">B.3</a>, <a class="iref" href="#rfc.xref.Part6.9">C</a><ul class="ind">
    30123238                        <li class="indline1"><em>Section 1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.4">2.2</a>, <a class="iref" href="#rfc.xref.Part6.9">C</a></li>
    3013                         <li class="indline1"><em>Section 16.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.5">4.5</a></li>
    3014                         <li class="indline1"><em>Section 16.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.6">4.5</a></li>
    3015                         <li class="indline1"><em>Section 16.6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.7">4.5</a></li>
     3239                        <li class="indline1"><em>Section 4.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.5">4.5</a></li>
     3240                        <li class="indline1"><em>Section 4.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.6">4.5</a></li>
     3241                        <li class="indline1"><em>Section 4.6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part6.7">4.5</a></li>
    30163242                     </ul>
    30173243                  </li>
     
    30223248                  <li class="indline1">representation&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.4">C</a></li>
    30233249                  <li class="indline1">request&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.1">C</a></li>
    3024                   <li class="indline1">resource&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.3">C</a></li>
    3025                   <li class="indline1">response&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.2">C</a></li>
     3250                  <li class="indline1">resource&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.2">C</a></li>
     3251                  <li class="indline1">response&nbsp;&nbsp;<a class="iref" href="#rfc.iref.r.3">C</a></li>
    30263252                  <li class="indline1"><em>RFC1123</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1123.1">3.2.1</a>, <a class="iref" href="#RFC1123"><b>12.2</b></a></li>
    30273253                  <li class="indline1"><em>RFC1305</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1305.1">8.3</a>, <a class="iref" href="#RFC1305"><b>12.2</b></a></li>
     
    30303256                  <li class="indline1"><em>RFC1945</em>&nbsp;&nbsp;<a class="iref" href="#RFC1945"><b>12.2</b></a>, <a class="iref" href="#rfc.xref.RFC1945.1">B</a></li>
    30313257                  <li class="indline1"><em>RFC2045</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2045.1">1</a>, <a class="iref" href="#rfc.xref.RFC2045.2">3.3</a>, <a class="iref" href="#rfc.xref.RFC2045.3">11</a>, <a class="iref" href="#RFC2045"><b>12.1</b></a></li>
    3032                   <li class="indline1"><em>RFC2047</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2047.1">1.2.2</a>, <a class="iref" href="#RFC2047"><b>12.1</b></a></li>
     3258                  <li class="indline1"><em>RFC2047</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2047.1">4.2</a>, <a class="iref" href="#RFC2047"><b>12.2</b></a></li>
    30333259                  <li class="indline1"><em>RFC2068</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.1">3.1</a>, <a class="iref" href="#rfc.xref.RFC2068.2">7.1.1</a>, <a class="iref" href="#rfc.xref.RFC2068.3">7.1.3</a>, <a class="iref" href="#rfc.xref.RFC2068.4">7.2.3</a>, <a class="iref" href="#rfc.xref.RFC2068.5">11</a>, <a class="iref" href="#RFC2068"><b>12.2</b></a>, <a class="iref" href="#rfc.xref.RFC2068.6">B</a>, <a class="iref" href="#rfc.xref.RFC2068.7">B.2</a><ul class="ind">
    30343260                        <li class="indline1"><em>Section 19.7.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.6">B</a></li>
     
    30383264                  <li class="indline1"><em>RFC2119</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2119.1">1.1</a>, <a class="iref" href="#RFC2119"><b>12.1</b></a>, <a class="iref" href="#rfc.xref.RFC2119.2">B.3</a></li>
    30393265                  <li class="indline1"><em>RFC2145</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2145.1">3.1</a>, <a class="iref" href="#rfc.xref.RFC2145.2">3.1</a>, <a class="iref" href="#RFC2145"><b>12.2</b></a>, <a class="iref" href="#rfc.xref.RFC2145.3">B.3</a></li>
    3040                   <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#rfc.xref.RFC2616.2">11</a>, <a class="iref" href="#RFC2616"><b>12.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.3">D.1</a></li>
     3266                  <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#rfc.xref.RFC2616.2">11</a>, <a class="iref" href="#RFC2616"><b>12.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.3">E.1</a></li>
    30413267                  <li class="indline1"><em>RFC2818</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2818.1">2.1.1</a>, <a class="iref" href="#RFC2818"><b>12.2</b></a></li>
    30423268                  <li class="indline1"><em>RFC2965</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2965.1">4.2</a>, <a class="iref" href="#RFC2965"><b>12.2</b></a></li>
     
    30883314            <li class="indline0"><a id="rfc.index.U" href="#rfc.index.U"><b>U</b></a><ul class="ind">
    30893315                  <li class="indline1">Upgrade header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.upgrade.1">4.5</a>, <a class="iref" href="#rfc.iref.u.3"><b>8.8</b></a>, <a class="iref" href="#rfc.xref.header.upgrade.2">9.1</a></li>
    3090                   <li class="indline1">upstream&nbsp;&nbsp;<a class="iref" href="#rfc.iref.u.5">C</a></li>
     3316                  <li class="indline1">upstream&nbsp;&nbsp;<a class="iref" href="#rfc.iref.u.4">C</a></li>
    30913317                  <li class="indline1">URI scheme&nbsp;&nbsp;
    30923318                     <ul class="ind">
     
    30953321                     </ul>
    30963322                  </li>
    3097                   <li class="indline1"><em>USASCII</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.USASCII.1">1.2</a>, <a class="iref" href="#USASCII"><b>12.1</b></a></li>
    3098                   <li class="indline1">user agent&nbsp;&nbsp;<a class="iref" href="#rfc.iref.u.4">C</a></li>
     3323                  <li class="indline1"><em>USASCII</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.USASCII.1">1.2</a>, <a class="iref" href="#rfc.xref.USASCII.2">4.2</a>, <a class="iref" href="#USASCII"><b>12.1</b></a></li>
     3324                  <li class="indline1">user agent&nbsp;&nbsp;<a class="iref" href="#rfc.iref.u.5">C</a></li>
    30993325               </ul>
    31003326            </li>
  • draft-ietf-httpbis/latest-roy/p1-messaging.xml

    r388 r437  
    1313  <!ENTITY SHOULD-NOT "<bcp14 xmlns='http://purl.org/net/xml2rfc/ext'>SHOULD NOT</bcp14>">
    1414  <!ENTITY ID-VERSION "latest">
    15   <!ENTITY ID-MONTH "November">
     15  <!ENTITY ID-MONTH "December">
    1616  <!ENTITY ID-YEAR "2008">
    1717  <!ENTITY caching                "<xref target='Part6' x:rel='#caching' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
     
    304304<section title="Syntax Notation" anchor="notation">
    305305<iref primary="true" item="Grammar" subitem="ALPHA"/>
    306 <iref primary="true" item="Grammar" subitem="CHAR"/>
    307306<iref primary="true" item="Grammar" subitem="CR"/>
    308307<iref primary="true" item="Grammar" subitem="CRLF"/>
     
    311310<iref primary="true" item="Grammar" subitem="DQUOTE"/>
    312311<iref primary="true" item="Grammar" subitem="HEXDIG"/>
    313 <iref primary="true" item="Grammar" subitem="HTAB"/>
    314312<iref primary="true" item="Grammar" subitem="LF"/>
    315313<iref primary="true" item="Grammar" subitem="OCTET"/>
    316314<iref primary="true" item="Grammar" subitem="SP"/>
     315<iref primary="true" item="Grammar" subitem="VCHAR"/>
    317316<iref primary="true" item="Grammar" subitem="WSP"/>
    318317<t anchor="core.rules">
    319318  <x:anchor-alias value="ALPHA"/>
    320   <x:anchor-alias value="CHAR"/>
    321319  <x:anchor-alias value="CTL"/>
    322320  <x:anchor-alias value="CR"/>
     
    325323  <x:anchor-alias value="DQUOTE"/>
    326324  <x:anchor-alias value="HEXDIG"/>
    327   <x:anchor-alias value="HTAB"/>
    328325  <x:anchor-alias value="LF"/>
    329326  <x:anchor-alias value="OCTET"/>
    330327  <x:anchor-alias value="SP"/>
     328  <x:anchor-alias value="VCHAR"/>
    331329  <x:anchor-alias value="WSP"/>
    332330   This specification uses the Augmented Backus-Naur Form (ABNF) notation
    333331   of <xref target="RFC5234"/>.  The following core rules are included by
    334332   reference, as defined in <xref target="RFC5234" x:fmt="," x:sec="B.1"/>:
    335    ALPHA (letters), CHAR (any <xref target="USASCII"/> character,
    336    excluding NUL), CR (carriage return), CRLF (CR LF), CTL (controls),
     333   ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls),
    337334   DIGIT (decimal 0-9), DQUOTE (double quote),
    338    HEXDIG (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab),
    339    LF (line feed), OCTET (any 8-bit sequence of data), SP (space)
    340    and WSP (white space).
    341 </t>
    342 
    343 <section title="ABNF Extensions" anchor="notation.abnf">
    344 <t>
    345    Two extensions to the ABNF rules of <xref target="RFC5234"/> are used to
    346    improve readability.<cref>The current plan is to remove these extensions prior
    347    to the last call draft.</cref>
    348 </t>
    349 
    350 <section title="#rule">
     335   HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed),
     336   OCTET (any 8-bit sequence of data), SP (space),
     337   VCHAR (any visible <xref target="USASCII"/> character),
     338   and WSP (whitespace).
     339</t>
     340
     341<section title="ABNF Extension: #rule" anchor="notation.abnf">
     342  <t>
     343    One extension to the ABNF rules of <xref target="RFC5234"/> is used to
     344    improve readability.
     345  </t>
    351346  <t>
    352347    A construct "#" is defined, similar to "*", for defining lists of
    353348    elements. The full form is "&lt;n&gt;#&lt;m&gt;element" indicating at least
    354     &lt;n&gt; and at most &lt;m&gt; elements, each separated by one or more commas
    355     (",") and &OPTIONAL; linear white space (OWS). This makes the usual
    356     form of lists very easy; a rule such as
    357     <figure><artwork type="example">
    358  ( *<x:ref>OWS</x:ref> element *( *<x:ref>OWS</x:ref> "," *<x:ref>OWS</x:ref> element ))</artwork></figure>
     349    &lt;n&gt; and at most &lt;m&gt; elements, each separated by a single comma
     350    (",") and optional whitespace (OWS).   
    359351  </t>
     352  <figure><preamble>
     353    Thus,
     354</preamble><artwork type="example">
     355  1#element =&gt; element *( OWS "," OWS element )
     356</artwork></figure>
     357  <figure><preamble>
     358    and:
     359</preamble><artwork type="example">
     360  #element =&gt; [ 1#element ]
     361</artwork></figure>
     362  <figure><preamble>
     363    and for n &gt;= 1 and m &gt; 1:
     364</preamble><artwork type="example">
     365  &lt;n&gt;#&lt;m&gt;element =&gt; element &lt;n-1&gt;*&lt;m-1&gt;( OWS "," OWS element )
     366</artwork></figure>
    360367  <t>
    361     can be shown as
    362     <figure><artwork type="example">
    363  1#element</artwork></figure>
     368    For compatibility with legacy list rules, recipients &SHOULD; accept empty
     369    list elements. In other words, consumers would follow the list productions:
    364370  </t>
    365   <t>
    366     Wherever this construct is used, null elements are allowed, but do
    367     not contribute to the count of elements present. That is,
    368     "(element), , (element) " is permitted, but counts as only two
    369     elements. Therefore, where at least one element is required, at
    370     least one non-null element &MUST; be present. Default values are 0
    371     and infinity so that "#element" allows any number, including zero;
    372     "1#element" requires at least one; and "1#2element" allows one or
    373     two.
    374   </t>
    375 </section>
    376 
    377 <section title="implied *LWS" anchor="implied.LWS">
    378   <iref item="implied *LWS" primary="true"/>
    379     <t>
    380       The grammar described by this specification is word-based. Except
    381       where noted otherwise, linear white space (LWS) can be included
    382       between any two adjacent words (token or quoted-string), and
    383       between adjacent words and separators, without changing the
    384       interpretation of a field. At least one delimiter (LWS and/or
    385       separators) &MUST; exist between any two tokens (for the definition
    386       of "token" below), since they would otherwise be interpreted as a
    387       single token.
    388     </t>
    389 </section>
     371<figure><artwork type="example">
     372#element =&gt; [ ( "," / element ) *( OWS "," [ OWS element ] ) ]
     373
     3741#element =&gt; *( "," OWS ) element *( OWS "," [ OWS element ] )
     375</artwork></figure> 
     376<t>
     377  <xref target="collected.abnf"/> shows the collected ABNF, with the list rules
     378  expanded as explained above.
     379</t>
    390380</section>
    391381
     
    399389</t>
    400390<t anchor="rule.LWS">
    401    All linear white space (LWS) in header field-values has the same semantics as SP. A
    402    recipient &MAY; replace any such linear white space with a single SP before
     391   This specification uses three rules to denote the use of linear
     392   whitespace: OWS (optional whitespace), RWS (required whitespace), and
     393   BWS ("bad" whitespace).
     394</t>
     395<t>
     396   The OWS rule is used where zero or more linear whitespace characters may
     397   appear. OWS &SHOULD; either not be produced or be produced as a single SP
     398   character. Multiple OWS characters that occur within field-content &SHOULD;
     399   be replaced with a single SP before interpreting the field value or
     400   forwarding the message downstream.
     401</t>
     402<t>
     403   RWS is used when at least one linear whitespace character is required to
     404   separate field tokens. RWS &SHOULD; be produced as a single SP character.
     405   Multiple RWS characters that occur within field-content &SHOULD; be
     406   replaced with a single SP before interpreting the field value or
     407   forwarding the message downstream.
     408</t>
     409<t>
     410   BWS is used where the grammar allows optional whitespace for historical
     411   reasons but senders &SHOULD-NOT; produce it in messages. HTTP/1.1
     412   recipients &MUST; accept such bad optional whitespace and remove it before
    403413   interpreting the field value or forwarding the message downstream.
    404 </t>
    405 <t>
    406    Historically, HTTP/1.1 header field values allow linear white space folding across
    407    multiple lines. However, this specification deprecates its use; senders &MUST-NOT;
    408    produce messages that include LWS folding (i.e., use the obs-fold rule), except
    409    within the message/http media type (<xref target="internet.media.type.message.http"/>).
    410    Receivers &SHOULD; still parse folded linear white space.
    411 </t>
    412 <t>
    413    This specification uses three rules to denote the use of linear white space;
    414    BWS ("Bad" White Space), OWS (Optional White Space), and RWS (Required White Space).
    415 </t>
    416 <t>
    417    "Bad" white space is allowed by the BNF, but senders &SHOULD-NOT; produce it in messages.
    418    Receivers &MUST; accept it in incoming messages.
    419 </t>
    420 <t>
    421    Required white space is used when at least one linear white space character
    422    is required to separate field tokens. In all such cases, a single SP character
    423    &SHOULD; be used.
    424414</t>
    425415<t anchor="rule.whitespace">
     
    431421<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="OWS"/><iref primary="true" item="Grammar" subitem="RWS"/><iref primary="true" item="Grammar" subitem="BWS"/>
    432422  <x:ref>OWS</x:ref>            = *( [ obs-fold ] <x:ref>WSP</x:ref> )
    433                  ; "optional" white space
     423                 ; "optional" whitespace
    434424  <x:ref>RWS</x:ref>            = 1*( [ obs-fold ] <x:ref>WSP</x:ref> )
    435                  ; "required" white space
     425                 ; "required" whitespace
    436426  <x:ref>BWS</x:ref>            = <x:ref>OWS</x:ref>
    437                  ; "bad" white space
     427                 ; "bad" whitespace
    438428  <x:ref>obs-fold</x:ref>       = <x:ref>CRLF</x:ref>
    439 </artwork></figure>
    440 <t anchor="rule.TEXT">
    441   <x:anchor-alias value="TEXT"/>
    442    The TEXT rule is only used for descriptive field contents and values
    443    that are not intended to be interpreted by the message parser. Words
    444    of *TEXT &MAY; contain characters from character sets other than ISO-8859-1
    445    <xref target="ISO-8859-1"/> only when encoded according to the rules of
    446    <xref target="RFC2047"/>.
    447 </t>
    448 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="TEXT"/>
    449   <x:ref>TEXT</x:ref>           = %x20-7E / %x80-FF / <x:ref>OWS</x:ref>
    450                  ; any <x:ref>OCTET</x:ref> except <x:ref>CTL</x:ref>s, but including <x:ref>OWS</x:ref>
    451 </artwork></figure>
    452 <t>
    453    A CRLF is allowed in the definition of TEXT only as part of a header
    454    field continuation. It is expected that the folding LWS will be
    455    replaced with a single SP before interpretation of the TEXT value.
    456 </t>
     429                 ; see <xref target="message.headers"/>
     430</artwork></figure>
    457431<t anchor="rule.token.separators">
    458432  <x:anchor-alias value="tchar"/>
    459433  <x:anchor-alias value="token"/>
    460    Many HTTP/1.1 header field values consist of words separated by LWS
     434   Many HTTP/1.1 header field values consist of words separated by whitespace
    461435   or special characters. These special characters &MUST; be in a quoted
    462436   string to be used within a parameter value (as defined in
     
    470444  <x:ref>token</x:ref>          = 1*<x:ref>tchar</x:ref>
    471445</artwork></figure>
    472 <t anchor="rule.comment">
    473   <x:anchor-alias value="comment"/>
    474   <x:anchor-alias value="ctext"/>
    475    Comments can be included in some HTTP header fields by surrounding
    476    the comment text with parentheses. Comments are only allowed in
    477    fields containing "comment" as part of their field value definition.
    478    In all other fields, parentheses are considered part of the field
    479    value.
    480 </t>
    481 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="comment"/><iref primary="true" item="Grammar" subitem="ctext"/>
    482   <x:ref>comment</x:ref>        = "(" *( <x:ref>ctext</x:ref> / <x:ref>quoted-pair</x:ref> / <x:ref>comment</x:ref> ) ")"
    483   <x:ref>ctext</x:ref>          = &lt;any <x:ref>TEXT</x:ref> excluding "(" and ")"&gt;
    484 </artwork></figure>
    485446<t anchor="rule.quoted-string">
    486447  <x:anchor-alias value="quoted-string"/>
    487448  <x:anchor-alias value="qdtext"/>
     449  <x:anchor-alias value="obs-text"/>
    488450   A string of text is parsed as a single word if it is quoted using
    489451   double-quote marks.
    490452</t>
    491 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="quoted-string"/><iref primary="true" item="Grammar" subitem="qdtext"/>
    492   <x:ref>quoted-string</x:ref>  = <x:ref>DQUOTE</x:ref> *(<x:ref>qdtext</x:ref> / <x:ref>quoted-pair</x:ref> ) <x:ref>DQUOTE</x:ref>
    493   <x:ref>qdtext</x:ref>         = &lt;any <x:ref>TEXT</x:ref> excluding <x:ref>DQUOTE</x:ref> and "\">
     453<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="quoted-string"/><iref primary="true" item="Grammar" subitem="qdtext"/><iref primary="true" item="Grammar" subitem="obs-text"/>
     454  <x:ref>quoted-string</x:ref>  = <x:ref>DQUOTE</x:ref> *( <x:ref>qdtext</x:ref> / <x:ref>quoted-pair</x:ref> ) <x:ref>DQUOTE</x:ref>
     455  <x:ref>qdtext</x:ref>         = *( <x:ref>OWS</x:ref> / %x21 / %x23-5B / %x5D-7E / <x:ref>obs-text</x:ref> )
     456  <x:ref>obs-text</x:ref>       = %x80-FF
    494457</artwork></figure>
    495458<t anchor="rule.quoted-pair">
     
    575538</t>
    576539<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="URI-reference"/><iref primary="true" item="Grammar" subitem="absolute-URI"/><iref primary="true" item="Grammar" subitem="authority"/><iref primary="true" item="Grammar" subitem="path-absolute"/><iref primary="true" item="Grammar" subitem="port"/><iref primary="true" item="Grammar" subitem="query"/><iref primary="true" item="Grammar" subitem="uri-host"/>
    577   <x:ref>URI</x:ref>           = &lt;URI, defined in <xref target="RFC3986" x:fmt="," x:sec="3"/>>
    578   <x:ref>URI-reference</x:ref> = &lt;URI-reference, defined in <xref target="RFC3986" x:fmt="," x:sec="4.1"/>>
    579   <x:ref>absolute-URI</x:ref>  = &lt;absolute-URI, defined in <xref target="RFC3986" x:fmt="," x:sec="4.3"/>>
    580   <x:ref>relative-part</x:ref> = &lt;relative-part, defined in <xref target="RFC3986" x:fmt="," x:sec="4.2"/>>
    581   <x:ref>authority</x:ref>     = &lt;authority, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2"/>>
    582   <x:ref>fragment</x:ref>      = &lt;fragment, defined in <xref target="RFC3986" x:fmt="," x:sec="3.5"/>>
    583   <x:ref>path-abempty</x:ref>  = &lt;path-abempty, defined in <xref target="RFC3986" x:fmt="," x:sec="3.3"/>>
    584   <x:ref>path-absolute</x:ref> = &lt;path-absolute, defined in <xref target="RFC3986" x:fmt="," x:sec="3.3"/>>
    585   <x:ref>port</x:ref>          = &lt;port, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2.3"/>>
    586   <x:ref>query</x:ref>         = &lt;query, defined in <xref target="RFC3986" x:fmt="," x:sec="3.4"/>>
    587   <x:ref>uri-host</x:ref>      = &lt;host, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2.2"/>>
     540  <x:ref>URI</x:ref>           = &lt;URI, defined in <xref target="RFC3986" x:fmt="," x:sec="3"/>&gt;
     541  <x:ref>URI-reference</x:ref> = &lt;URI-reference, defined in <xref target="RFC3986" x:fmt="," x:sec="4.1"/>&gt;
     542  <x:ref>absolute-URI</x:ref>  = &lt;absolute-URI, defined in <xref target="RFC3986" x:fmt="," x:sec="4.3"/>&gt;
     543  <x:ref>relative-part</x:ref> = &lt;relative-part, defined in <xref target="RFC3986" x:fmt="," x:sec="4.2"/>&gt;
     544  <x:ref>authority</x:ref>     = &lt;authority, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2"/>&gt;
     545  <x:ref>fragment</x:ref>      = &lt;fragment, defined in <xref target="RFC3986" x:fmt="," x:sec="3.5"/>&gt;
     546  <x:ref>path-abempty</x:ref>  = &lt;path-abempty, defined in <xref target="RFC3986" x:fmt="," x:sec="3.3"/>&gt;
     547  <x:ref>path-absolute</x:ref> = &lt;path-absolute, defined in <xref target="RFC3986" x:fmt="," x:sec="3.3"/>&gt;
     548  <x:ref>port</x:ref>          = &lt;port, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2.3"/>&gt;
     549  <x:ref>query</x:ref>         = &lt;query, defined in <xref target="RFC3986" x:fmt="," x:sec="3.4"/>&gt;
     550  <x:ref>uri-host</x:ref>      = &lt;host, defined in <xref target="RFC3986" x:fmt="," x:sec="3.2.2"/>&gt;
    588551 
    589552  <x:ref>partial-URI</x:ref>   = relative-part [ "?" query ]
     
    774737<section title="Use of HTTP for proxy communication" anchor="http.proxy">
    775738<t>
    776    Configured to use HTTP to proxy HTTP or other protocols.
     739   <cref>TBD: Configured to use HTTP to proxy HTTP or other protocols.</cref>
    777740</t>
    778741</section>
    779742<section title="Interception of HTTP for access control" anchor="http.intercept">
    780743<t>
    781    Interception of HTTP traffic for initiating access control.
     744   <cref>TBD: Interception of HTTP traffic for initiating access control.</cref>
    782745</t>
    783746</section>
    784747<section title="Use of HTTP by other protocols" anchor="http.others">
    785748<t>
    786    Profiles of HTTP defined by other protocol.
    787    Extensions of HTTP like WebDAV.
     749   <cref>TBD: Profiles of HTTP defined by other protocol.
     750   Extensions of HTTP like WebDAV.</cref>
    788751</t>
    789752</section>
    790753<section title="Use of HTTP by media type specification" anchor="http.media">
    791754<t>
    792    Instructions on composing HTTP requests via hypertext formats.
     755   <cref>TBD: Instructions on composing HTTP requests via hypertext formats.</cref>
    793756</t>
    794757</section>
     
    917880   abbreviation for time zone, and &MUST; be assumed when reading the
    918881   asctime format. HTTP-date is case sensitive and &MUST-NOT; include
    919    additional LWS beyond that specifically included as SP in the
     882   additional whitespace beyond that specifically included as SP in the
    920883   grammar.
    921884</t>
     
    10821045  <x:ref>chunk-ext-val</x:ref>  = <x:ref>token</x:ref> / <x:ref>quoted-string</x:ref>
    10831046  <x:ref>chunk-data</x:ref>     = 1*<x:ref>OCTET</x:ref> ; a sequence of chunk-size octets
    1084   <x:ref>trailer-part</x:ref>   = *(<x:ref>entity-header</x:ref> <x:ref>CRLF</x:ref>)
     1047  <x:ref>trailer-part</x:ref>   = *( <x:ref>entity-header</x:ref> <x:ref>CRLF</x:ref> )
    10851048</artwork></figure>
    10861049<t>
     
    11551118   identify themselves by software name and version. Most fields using
    11561119   product tokens also allow sub-products which form a significant part
    1157    of the application to be listed, separated by white space. By
     1120   of the application to be listed, separated by whitespace. By
    11581121   convention, the products are listed in order of their significance
    11591122   for identifying the application.
     
    12051168<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="generic-message"/><iref primary="true" item="Grammar" subitem="start-line"/>
    12061169  <x:ref>generic-message</x:ref> = <x:ref>start-line</x:ref>
    1207                     *(<x:ref>message-header</x:ref> <x:ref>CRLF</x:ref>)
     1170                    *( <x:ref>message-header</x:ref> <x:ref>CRLF</x:ref> )
    12081171                    <x:ref>CRLF</x:ref>
    12091172                    [ <x:ref>message-body</x:ref> ]
     
    12211184   BNF, an HTTP/1.1 client &MUST-NOT; preface or follow a request with an
    12221185   extra CRLF.
     1186</t>
     1187<t>
     1188   Whitespace (WSP) &MUST-NOT; be sent between the start-line and the first
     1189   header field. The presence of whitespace might be an attempt to trick a
     1190   noncompliant implementation of HTTP into ignoring that field or processing
     1191   the next line as a new request, either of which may result in security
     1192   issues when implementations within the request chain interpret the
     1193   same message differently. HTTP/1.1 servers &MUST; reject such a message
     1194   with a 400 (Bad Request) response.
    12231195</t>
    12241196</section>
     
    12301202  <x:anchor-alias value="message-header"/>
    12311203<t>
    1232    HTTP header fields, which include general-header (<xref target="general.header.fields"/>),
    1233    request-header (&request-header-fields;), response-header (&response-header-fields;), and
    1234    entity-header (&entity-header-fields;) fields, follow the same generic format as
    1235    that given in <xref target="RFC5322" x:fmt="of" x:sec="2.1"/>. Each header field consists
    1236    of a name followed by a colon (":") and the field value. Field names
    1237    are case-insensitive. The field value &MAY; be preceded by any amount
    1238    of LWS, though a single SP is preferred. Header fields can be
    1239    extended over multiple lines by preceding each extra line with at
    1240    least one SP or HTAB. Applications ought to follow "common form", where
    1241    one is known or indicated, when generating HTTP constructs, since
    1242    there might exist some implementations that fail to accept anything
    1243    beyond the common forms.
     1204   HTTP header fields follow the same general format as Internet messages in
     1205   <xref target="RFC5322" x:fmt="of" x:sec="2.1"/>. Each header field consists
     1206   of a name followed by a colon (":"), optional whitespace, and the field
     1207   value. Field names are case-insensitive.
    12441208</t>
    12451209<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="message-header"/><iref primary="true" item="Grammar" subitem="field-name"/><iref primary="true" item="Grammar" subitem="field-value"/><iref primary="true" item="Grammar" subitem="field-content"/>
    1246   <x:ref>message-header</x:ref> = <x:ref>field-name</x:ref> ":" [ <x:ref>field-value</x:ref> ]
     1210  <x:ref>message-header</x:ref> = <x:ref>field-name</x:ref> ":" OWS [ <x:ref>field-value</x:ref> ] OWS
    12471211  <x:ref>field-name</x:ref>     = <x:ref>token</x:ref>
    12481212  <x:ref>field-value</x:ref>    = *( <x:ref>field-content</x:ref> / <x:ref>OWS</x:ref> )
    1249   <x:ref>field-content</x:ref>  = &lt;field content&gt;
    1250 </artwork></figure>
    1251 <t>
    1252   <cref>whitespace between field-name and colon is an error and MUST NOT be accepted</cref>
    1253 </t>
    1254 <t>
    1255    The field-content does not include any leading or trailing LWS:
    1256    linear white space occurring before the first non-whitespace
    1257    character of the field-value or after the last non-whitespace
    1258    character of the field-value. Such leading or trailing LWS &MAY; be
    1259    removed without changing the semantics of the field value. Any LWS
    1260    that occurs between field-content &MAY; be replaced with a single SP
    1261    before interpreting the field value or forwarding the message
    1262    downstream.
    1263 </t>
     1213  <x:ref>field-content</x:ref>  = *( <x:ref>WSP</x:ref> / <x:ref>VCHAR</x:ref> / <x:ref>obs-text</x:ref> )
     1214</artwork></figure>
     1215<t>
     1216   Historically, HTTP has allowed field-content with text in the ISO-8859-1
     1217   <xref target="ISO-8859-1"/> character encoding (allowing other character sets
     1218   through use of <xref target="RFC2047"/> encoding). In practice, most HTTP
     1219   header field-values use only a subset of the US-ASCII charset
     1220   <xref target="USASCII"/>. Newly defined header fields &SHOULD; constrain
     1221   their field-values to US-ASCII characters. Recipients &SHOULD; treat other
     1222   (obs-text) octets in field-content as opaque data.
     1223</t>
     1224<t>
     1225   No whitespace is allowed between the header field-name and colon. For
     1226   security reasons, any request message received containing such whitespace
     1227   &MUST; be rejected with a response code of 400 (Bad Request) and any such
     1228   whitespace in a response message &MUST; be removed.
     1229</t>
     1230<t>
     1231   The field value &MAY; be preceded by optional whitespace; a single SP is
     1232   preferred. The field-value does not include any leading or trailing white
     1233   space: OWS occurring before the first non-whitespace character of the
     1234   field-value or after the last non-whitespace character of the field-value
     1235   is ignored and &MAY; be removed without changing the meaning of the header
     1236   field.
     1237</t>
     1238<t>
     1239   Historically, HTTP header field values could be extended over multiple
     1240   lines by preceding each extra line with at least one space or horizontal
     1241   tab character (line folding). This specification deprecates such line
     1242   folding except within the message/http media type
     1243   (<xref target="internet.media.type.message.http"/>).
     1244   HTTP/1.1 senders &MUST-NOT; produce messages that include line folding
     1245   (i.e., that contain any field-content that matches the obs-fold rule) unless
     1246   the message is intended for packaging within the message/http media type.
     1247   HTTP/1.1 recipients &SHOULD; accept line folding and replace any embedded
     1248   obs-fold whitespace with a single SP prior to interpreting the field value
     1249   or forwarding the message downstream.
     1250</t>
     1251<t anchor="rule.comment">
     1252  <x:anchor-alias value="comment"/>
     1253  <x:anchor-alias value="ctext"/>
     1254   Comments can be included in some HTTP header fields by surrounding
     1255   the comment text with parentheses. Comments are only allowed in
     1256   fields containing "comment" as part of their field value definition.
     1257   In all other fields, parentheses are considered part of the field
     1258   value.
     1259</t>
     1260<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="comment"/><iref primary="true" item="Grammar" subitem="ctext"/>
     1261  <x:ref>comment</x:ref>        = "(" *( <x:ref>ctext</x:ref> / <x:ref>quoted-pair</x:ref> / <x:ref>comment</x:ref> ) ")"
     1262  <x:ref>ctext</x:ref>          = *( <x:ref>OWS</x:ref> / %x21-27 / %x2A-7E / <x:ref>obs-text</x:ref> )
     1263</artwork></figure>
    12641264<t>
    12651265   The order in which header fields with differing field names are
     
    14681468                  *(( <x:ref>general-header</x:ref>        ; <xref target="general.header.fields"/>
    14691469                   / <x:ref>request-header</x:ref>         ; &request-header-fields;
    1470                    / <x:ref>entity-header</x:ref> ) <x:ref>CRLF</x:ref>)  ; &entity-header-fields;
     1470                   / <x:ref>entity-header</x:ref> ) <x:ref>CRLF</x:ref> )  ; &entity-header-fields;
    14711471                  <x:ref>CRLF</x:ref>
    14721472                  [ <x:ref>message-body</x:ref> ]          ; <xref target="message.body"/>
     
    15031503</t>
    15041504<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="request-target"/>
    1505   <x:ref>request-target</x:ref>    = "*"
     1505  <x:ref>request-target</x:ref> = "*"
    15061506                 / <x:ref>absolute-URI</x:ref>
    15071507                 / ( <x:ref>path-absolute</x:ref> [ "?" <x:ref>query</x:ref> ] )
     
    15161516</t>
    15171517<figure><artwork type="example">
    1518     OPTIONS * HTTP/1.1
     1518  OPTIONS * HTTP/1.1
    15191519</artwork></figure>
    15201520<t>
     
    15291529</t>
    15301530<figure><artwork type="example">
    1531     GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
     1531  GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
    15321532</artwork></figure>
    15331533<t>
     
    15511551</t>
    15521552<figure><artwork type="example">
    1553     GET /pub/WWW/TheProject.html HTTP/1.1
    1554     Host: www.example.org
     1553  GET /pub/WWW/TheProject.html HTTP/1.1
     1554  Host: www.example.org
    15551555</artwork></figure>
    15561556<t>
     
    15591559   given as "/" (the server root).
    15601560</t>
     1561<t>
     1562   If a proxy receives a request without any path in the request-target and
     1563   the method specified is capable of supporting the asterisk form of
     1564   request-target, then the last proxy on the request chain &MUST; forward the
     1565   request with "*" as the final request-target.
     1566</t>
     1567<figure><preamble>   
     1568   For example, the request
     1569</preamble><artwork type="example">
     1570  OPTIONS http://www.example.org:8001 HTTP/1.1
     1571</artwork></figure>
     1572<figure><preamble>   
     1573  would be forwarded by the proxy as
     1574</preamble><artwork type="example">
     1575  OPTIONS * HTTP/1.1
     1576  Host: www.example.org:8001
     1577</artwork>
     1578<postamble>
     1579   after connecting to port 8001 of host "www.example.org".
     1580</postamble>
     1581</figure>
    15611582<t>
    15621583   The request-target is transmitted in the format specified in
     
    15851606   HTTP does not place a pre-defined limit on the length of a request-target.
    15861607   A server &MUST; be prepared to receive URIs of unbounded length and
    1587    respond with the 414 (URI too long) status if the received
     1608   respond with the 414 (Request-target too Long) status if the received
    15881609   request-target would be longer than the server wishes to handle
    15891610   (see &status-414;).
     
    16461667                  *(( <x:ref>general-header</x:ref>        ; <xref target="general.header.fields"/>
    16471668                   / <x:ref>response-header</x:ref>        ; &response-header-fields;
    1648                    / <x:ref>entity-header</x:ref> ) <x:ref>CRLF</x:ref>)  ; &entity-header-fields;
     1669                   / <x:ref>entity-header</x:ref> ) <x:ref>CRLF</x:ref> )  ; &entity-header-fields;
    16491670                  <x:ref>CRLF</x:ref>
    16501671                  [ <x:ref>message-body</x:ref> ]          ; <xref target="message.body"/>
     
    17031724<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Status-Code"/><iref primary="true" item="Grammar" subitem="extension-code"/><iref primary="true" item="Grammar" subitem="Reason-Phrase"/>
    17041725  <x:ref>Status-Code</x:ref>    = 3<x:ref>DIGIT</x:ref>
    1705   <x:ref>Reason-Phrase</x:ref>  = *&lt;<x:ref>TEXT</x:ref>, excluding <x:ref>CR</x:ref>, <x:ref>LF</x:ref>&gt;
     1726  <x:ref>Reason-Phrase</x:ref>  = *( <x:ref>WSP</x:ref> / <x:ref>VCHAR</x:ref> / <x:ref>obs-text</x:ref> )
    17061727</artwork></figure>
    17071728</section>
     
    33493370</reference>
    33503371
    3351 <reference anchor="RFC2047">
    3352   <front>
    3353     <title abbrev="Message Header Extensions">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</title>
    3354     <author initials="K." surname="Moore" fullname="Keith Moore">
    3355       <organization>University of Tennessee</organization>
    3356       <address><email>moore@cs.utk.edu</email></address>
    3357     </author>
    3358     <date month="November" year="1996"/>
    3359   </front>
    3360   <seriesInfo name="RFC" value="2047"/>
    3361 </reference>
    3362 
    33633372<reference anchor="RFC2119">
    33643373  <front>
     
    35643573</reference>
    35653574
     3575<reference anchor="RFC2047">
     3576  <front>
     3577    <title abbrev="Message Header Extensions">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</title>
     3578    <author initials="K." surname="Moore" fullname="Keith Moore">
     3579      <organization>University of Tennessee</organization>
     3580      <address><email>moore@cs.utk.edu</email></address>
     3581    </author>
     3582    <date month="November" year="1996"/>
     3583  </front>
     3584  <seriesInfo name="RFC" value="2047"/>
     3585</reference>
     3586
    35663587<reference anchor="RFC2068">
    35673588  <front>
     
    38763897   Clients &SHOULD; be tolerant in parsing the Status-Line and servers
    38773898   tolerant when parsing the Request-Line. In particular, they &SHOULD;
    3878    accept any amount of SP or HTAB characters between fields, even though
     3899   accept any amount of WSP characters between fields, even though
    38793900   only a single SP is required.
    38803901</t>
     
    40864107<section title="Changes from RFC 2616" anchor="changes.from.rfc.2616">
    40874108<t>
    4088   Rules about implicit linear white space between certain grammar productions
     4109  Empty list elements in list productions have been deprecated.
     4110  (<xref target="notation.abnf"/>)
     4111</t>
     4112<t>
     4113  Rules about implicit linear whitespace between certain grammar productions
    40894114  have been removed; now it's only allowed when specifically pointed out
    4090   in the ABNF.
    4091   The CHAR rule does not allow the NUL character anymore (this affects
    4092   the comment and quoted-string rules).  Furthermore, the quoted-pair
    4093   rule does not allow escaping NUL, CR or LF anymore.
     4115  in the ABNF. The NUL character is no longer allowed in comment and quoted-string
     4116  text. The quoted-pair rule no longer allows escaping NUL, CR or LF.
     4117  Non-ASCII content in header fields and reason phrase has been obsoleted and
     4118  made opaque (the TEXT rule was removed)
    40944119  (<xref target="basic.rules"/>)
    40954120</t>
     
    41094134</t>
    41104135<t>
     4136  Require that invalid whitespace around field-names be rejected.
     4137  (<xref target="message.headers"/>)
     4138</t>
     4139<t>
    41114140  Update use of abs_path production from RFC1808 to the path-absolute + query
    41124141  components of RFC3986.
     
    41264155</t>
    41274156<t>
     4157  <iref item="cache"/>
     4158  <x:dfn>cache</x:dfn>
     4159  <list>
     4160    <t>
     4161      A program's local store of response messages and the subsystem
     4162      that controls its message storage, retrieval, and deletion. A
     4163      cache stores cacheable responses in order to reduce the response
     4164      time and network bandwidth consumption on future, equivalent
     4165      requests. Any client or server may include a cache, though a cache
     4166      cannot be used by a server that is acting as a tunnel.
     4167    </t>
     4168  </list>
     4169</t>
     4170<t>
     4171  <iref item="cacheable"/>
     4172  <x:dfn>cacheable</x:dfn>
     4173  <list>
     4174    <t>
     4175      A response is cacheable if a cache is allowed to store a copy of
     4176      the response message for use in answering subsequent requests. The
     4177      rules for determining the cacheability of HTTP responses are
     4178      defined in &caching;. Even if a resource is cacheable, there may
     4179      be additional constraints on whether a cache can use the cached
     4180      copy for a particular request.
     4181    </t>
     4182  </list>
     4183</t>
     4184<t>
     4185  <iref item="client"/>
     4186  <x:dfn>client</x:dfn>
     4187  <list>
     4188    <t>
     4189      A program that establishes connections for the purpose of sending
     4190      requests.
     4191    </t>
     4192  </list>
     4193</t>
     4194<t>
    41284195  <iref item="connection"/>
    41294196  <x:dfn>connection</x:dfn>
     
    41364203</t>
    41374204<t>
    4138   <iref item="message"/>
    4139   <x:dfn>message</x:dfn>
     4205  <iref item="content negotiation"/>
     4206  <x:dfn>content negotiation</x:dfn>
    41404207  <list>
    41414208    <t>
    4142       The basic unit of HTTP communication, consisting of a structured
    4143       sequence of octets matching the syntax defined in <xref target="http.message"/> and
    4144       transmitted via the connection.
    4145     </t>
    4146   </list>
    4147 </t>
    4148 <t>
    4149   <iref item="request"/>
    4150   <x:dfn>request</x:dfn>
    4151   <list>
    4152     <t>
    4153       An HTTP request message, as defined in <xref target="request"/>.
    4154     </t>
    4155   </list>
    4156 </t>
    4157 <t>
    4158   <iref item="response"/>
    4159   <x:dfn>response</x:dfn>
    4160   <list>
    4161     <t>
    4162       An HTTP response message, as defined in <xref target="response"/>.
    4163     </t>
    4164   </list>
    4165 </t>
    4166 <t>
    4167   <iref item="resource"/>
    4168   <x:dfn>resource</x:dfn>
    4169   <list>
    4170     <t>
    4171       A network data object or service that can be identified by a URI,
    4172       as defined in <xref target="uri"/>. Resources may be available in multiple
    4173       representations (e.g. multiple languages, data formats, size, and
    4174       resolutions) or vary in other ways.
     4209      The mechanism for selecting the appropriate representation when
     4210      servicing a request, as described in &content.negotiation;. The
     4211      representation of entities in any response can be negotiated
     4212      (including error responses).
    41754213    </t>
    41764214  </list>
     
    41894227</t>
    41904228<t>
    4191   <iref item="representation"/>
    4192   <x:dfn>representation</x:dfn>
     4229  <iref item="gateway"/>
     4230  <x:dfn>gateway</x:dfn>
    41934231  <list>
    41944232    <t>
    4195       An entity included with a response that is subject to content
    4196       negotiation, as described in &content.negotiation;. There may exist multiple
    4197       representations associated with a particular response status.
    4198     </t>
    4199   </list>
    4200 </t>
    4201 <t>
    4202   <iref item="content negotiation"/>
    4203   <x:dfn>content negotiation</x:dfn>
     4233      A server which acts as an intermediary for some other server.
     4234      Unlike a proxy, a gateway receives requests as if it were the
     4235      origin server for the requested resource; the requesting client
     4236      may not be aware that it is communicating with a gateway.
     4237    </t>
     4238  </list>
     4239</t>
     4240<t>
     4241  <iref item="inbound"/>
     4242  <iref item="outbound"/>
     4243  <x:dfn>inbound</x:dfn>/<x:dfn>outbound</x:dfn>
    42044244  <list>
    42054245    <t>
    4206       The mechanism for selecting the appropriate representation when
    4207       servicing a request, as described in &content.negotiation;. The
    4208       representation of entities in any response can be negotiated
    4209       (including error responses).
    4210     </t>
    4211   </list>
    4212 </t>
    4213 <t>
    4214   <iref item="variant"/>
    4215   <x:dfn>variant</x:dfn>
     4246      Inbound and outbound refer to the request and response paths for
     4247      messages: "inbound" means "traveling toward the origin server",
     4248      and "outbound" means "traveling toward the user agent"
     4249    </t>
     4250  </list>
     4251</t>
     4252<t>
     4253  <iref item="message"/>
     4254  <x:dfn>message</x:dfn>
    42164255  <list>
    42174256    <t>
    4218       A resource may have one, or more than one, representation(s)
    4219       associated with it at any given instant. Each of these
    4220       representations is termed a `variant'.  Use of the term `variant'
    4221       does not necessarily imply that the resource is subject to content
    4222       negotiation.
    4223     </t>
    4224   </list>
    4225 </t>
    4226 <t>
    4227   <iref item="client"/>
    4228   <x:dfn>client</x:dfn>
    4229   <list>
    4230     <t>
    4231       A program that establishes connections for the purpose of sending
    4232       requests.
    4233     </t>
    4234   </list>
    4235 </t>
    4236 <t>
    4237   <iref item="user agent"/>
    4238   <x:dfn>user agent</x:dfn>
    4239   <list>
    4240     <t>
    4241       The client which initiates a request. These are often browsers,
    4242       editors, spiders (web-traversing robots), or other end user tools.
    4243     </t>
    4244   </list>
    4245 </t>
    4246 <t>
    4247   <iref item="server"/>
    4248   <x:dfn>server</x:dfn>
    4249   <list>
    4250     <t>
    4251       An application program that accepts connections in order to
    4252       service requests by sending back responses. Any given program may
    4253       be capable of being both a client and a server; our use of these
    4254       terms refers only to the role being performed by the program for a
    4255       particular connection, rather than to the program's capabilities
    4256       in general. Likewise, any server may act as an origin server,
    4257       proxy, gateway, or tunnel, switching behavior based on the nature
    4258       of each request.
     4257      The basic unit of HTTP communication, consisting of a structured
     4258      sequence of octets matching the syntax defined in <xref target="http.message"/> and
     4259      transmitted via the connection.
    42594260    </t>
    42604261  </list>
     
    42924293</t>
    42934294<t>
    4294   <iref item="gateway"/>
    4295   <x:dfn>gateway</x:dfn>
     4295  <iref item="request"/>
     4296  <x:dfn>request</x:dfn>
    42964297  <list>
    42974298    <t>
    4298       A server which acts as an intermediary for some other server.
    4299       Unlike a proxy, a gateway receives requests as if it were the
    4300       origin server for the requested resource; the requesting client
    4301       may not be aware that it is communicating with a gateway.
     4299      An HTTP request message, as defined in <xref target="request"/>.
     4300    </t>
     4301  </list>
     4302</t>
     4303<t>
     4304  <iref item="resource"/>
     4305  <x:dfn>resource</x:dfn>
     4306  <list>
     4307    <t>
     4308      A network data object or service that can be identified by a URI,
     4309      as defined in <xref target="uri"/>. Resources may be available in multiple
     4310      representations (e.g. multiple languages, data formats, size, and
     4311      resolutions) or vary in other ways.
     4312    </t>
     4313  </list>
     4314</t>
     4315<t>
     4316  <iref item="response"/>
     4317  <x:dfn>response</x:dfn>
     4318  <list>
     4319    <t>
     4320      An HTTP response message, as defined in <xref target="response"/>.
     4321    </t>
     4322  </list>
     4323</t>
     4324<t>
     4325  <iref item="representation"/>
     4326  <x:dfn>representation</x:dfn>
     4327  <list>
     4328    <t>
     4329      An entity included with a response that is subject to content
     4330      negotiation, as described in &content.negotiation;. There may exist multiple
     4331      representations associated with a particular response status.
     4332    </t>
     4333  </list>
     4334</t>
     4335<t>
     4336  <iref item="server"/>
     4337  <x:dfn>server</x:dfn>
     4338  <list>
     4339    <t>
     4340      An application program that accepts connections in order to
     4341      service requests by sending back responses. Any given program may
     4342      be capable of being both a client and a server; our use of these
     4343      terms refers only to the role being performed by the program for a
     4344      particular connection, rather than to the program's capabilities
     4345      in general. Likewise, any server may act as an origin server,
     4346      proxy, gateway, or tunnel, switching behavior based on the nature
     4347      of each request.
    43024348    </t>
    43034349  </list>
     
    43174363</t>
    43184364<t>
    4319   <iref item="cache"/>
    4320   <x:dfn>cache</x:dfn>
    4321   <list>
    4322     <t>
    4323       A program's local store of response messages and the subsystem
    4324       that controls its message storage, retrieval, and deletion. A
    4325       cache stores cacheable responses in order to reduce the response
    4326       time and network bandwidth consumption on future, equivalent
    4327       requests. Any client or server may include a cache, though a cache
    4328       cannot be used by a server that is acting as a tunnel.
    4329     </t>
    4330   </list>
    4331 </t>
    4332 <t>
    4333   <iref item="cacheable"/>
    4334   <x:dfn>cacheable</x:dfn>
    4335   <list>
    4336     <t>
    4337       A response is cacheable if a cache is allowed to store a copy of
    4338       the response message for use in answering subsequent requests. The
    4339       rules for determining the cacheability of HTTP responses are
    4340       defined in &caching;. Even if a resource is cacheable, there may
    4341       be additional constraints on whether a cache can use the cached
    4342       copy for a particular request.
    4343     </t>
    4344   </list>
    4345 </t>
    4346 <t>
    43474365  <iref item="upstream"/>
    43484366  <iref item="downstream"/>
     
    43564374</t>
    43574375<t>
    4358   <iref item="inbound"/>
    4359   <iref item="outbound"/>
    4360   <x:dfn>inbound</x:dfn>/<x:dfn>outbound</x:dfn>
     4376  <iref item="user agent"/>
     4377  <x:dfn>user agent</x:dfn>
    43614378  <list>
    43624379    <t>
    4363       Inbound and outbound refer to the request and response paths for
    4364       messages: "inbound" means "traveling toward the origin server",
    4365       and "outbound" means "traveling toward the user agent"
    4366     </t>
    4367   </list>
    4368 </t>
     4380      The client which initiates a request. These are often browsers,
     4381      editors, spiders (web-traversing robots), or other end user tools.
     4382    </t>
     4383  </list>
     4384</t>
     4385<t>
     4386  <iref item="variant"/>
     4387  <x:dfn>variant</x:dfn>
     4388  <list>
     4389    <t>
     4390      A resource may have one, or more than one, representation(s)
     4391      associated with it at any given instant. Each of these
     4392      representations is termed a `variant'.  Use of the term `variant'
     4393      does not necessarily imply that the resource is subject to content
     4394      negotiation.
     4395    </t>
     4396  </list>
     4397</t>
     4398</section>
     4399
     4400<section xmlns:x="http://purl.org/net/xml2rfc/ext" title="Collected ABNF" anchor="collected.abnf">
     4401<figure>
     4402<artwork type="abnf" name="p1-messaging.parsed-abnf">
     4403<x:ref>BWS</x:ref> = OWS
     4404
     4405<x:ref>Cache-Control</x:ref> = &lt;Cache-Control, defined in [Part6], Section 15.4&gt;
     4406<x:ref>Chunked-Body</x:ref> = *chunk last-chunk trailer-part CRLF
     4407<x:ref>Connection</x:ref> = "Connection:" OWS Connection-v
     4408<x:ref>Connection-v</x:ref> = *( "," OWS ) connection-token *( OWS "," [ OWS
     4409 connection-token ] )
     4410<x:ref>Content-Length</x:ref> = "Content-Length:" OWS 1*Content-Length-v
     4411<x:ref>Content-Length-v</x:ref> = 1*DIGIT
     4412
     4413<x:ref>Date</x:ref> = "Date:" OWS Date-v
     4414<x:ref>Date-v</x:ref> = HTTP-date
     4415
     4416GMT = %x47.4D.54
     4417
     4418<x:ref>HTTP-Prot-Name</x:ref> = %x48.54.54.50
     4419<x:ref>HTTP-Version</x:ref> = HTTP-Prot-Name "/" 1*DIGIT "." 1*DIGIT
     4420<x:ref>HTTP-date</x:ref> = rfc1123-date / obsolete-date
     4421<x:ref>HTTP-message</x:ref> = Request / Response
     4422<x:ref>Host</x:ref> = "Host:" OWS Host-v
     4423<x:ref>Host-v</x:ref> = uri-host [ ":" port ]
     4424
     4425<x:ref>Method</x:ref> = token
     4426
     4427<x:ref>OWS</x:ref> = *( [ obs-fold ] WSP )
     4428
     4429<x:ref>Pragma</x:ref> = &lt;Pragma, defined in [Part6], Section 15.4&gt;
     4430
     4431<x:ref>RWS</x:ref> = 1*( [ obs-fold ] WSP )
     4432<x:ref>Reason-Phrase</x:ref> = *( WSP / VCHAR / obs-text )
     4433<x:ref>Request</x:ref> = Request-Line *( ( general-header / request-header /
     4434 entity-header ) CRLF ) CRLF [ message-body ]
     4435<x:ref>Request-Line</x:ref> = Method SP request-target SP HTTP-Version CRLF
     4436<x:ref>Response</x:ref> = Status-Line *( ( general-header / response-header /
     4437 entity-header ) CRLF ) CRLF [ message-body ]
     4438
     4439<x:ref>Status-Code</x:ref> = 3DIGIT
     4440<x:ref>Status-Line</x:ref> = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
     4441
     4442<x:ref>TE</x:ref> = "TE:" OWS TE-v
     4443<x:ref>TE-v</x:ref> = [ ( "," / t-codings ) *( OWS "," [ OWS t-codings ] ) ]
     4444<x:ref>Trailer</x:ref> = "Trailer:" OWS Trailer-v
     4445<x:ref>Trailer-v</x:ref> = *( "," OWS ) field-name *( OWS "," [ OWS field-name ] )
     4446<x:ref>Transfer-Encoding</x:ref> = "Transfer-Encoding:" OWS Transfer-Encoding-v
     4447<x:ref>Transfer-Encoding-v</x:ref> = *( "," OWS ) transfer-coding *( OWS "," [ OWS
     4448 transfer-coding ] )
     4449
     4450<x:ref>URI</x:ref> = &lt;URI, defined in [RFC3986], Section 3&gt;
     4451<x:ref>URI-reference</x:ref> = &lt;URI-reference, defined in [RFC3986], Section 4.1&gt;
     4452<x:ref>Upgrade</x:ref> = "Upgrade:" OWS Upgrade-v
     4453<x:ref>Upgrade-v</x:ref> = *( "," OWS ) product *( OWS "," [ OWS product ] )
     4454
     4455<x:ref>Via</x:ref> = "Via:" OWS Via-v
     4456<x:ref>Via-v</x:ref> = *( "," OWS ) received-protocol RWS received-by [ RWS comment
     4457 ] *( OWS "," [ OWS received-protocol RWS received-by [ RWS comment ]
     4458 ] )
     4459
     4460<x:ref>Warning</x:ref> = &lt;Warning, defined in [Part6], Section 15.6&gt;
     4461
     4462<x:ref>absolute-URI</x:ref> = &lt;absolute-URI, defined in [RFC3986], Section 4.3&gt;
     4463<x:ref>accept-params</x:ref> = &lt;accept-params, defined in [Part3], Section 5.1&gt;
     4464<x:ref>asctime-date</x:ref> = wkday SP date3 SP time SP 4DIGIT
     4465<x:ref>attribute</x:ref> = token
     4466<x:ref>authority</x:ref> = &lt;authority, defined in [RFC3986], Section 3.2&gt;
     4467
     4468<x:ref>chunk</x:ref> = chunk-size *WSP [ chunk-ext ] CRLF chunk-data CRLF
     4469<x:ref>chunk-data</x:ref> = 1*OCTET
     4470<x:ref>chunk-ext</x:ref> = *( ";" *WSP chunk-ext-name [ "=" chunk-ext-val ] *WSP )
     4471<x:ref>chunk-ext-name</x:ref> = token
     4472<x:ref>chunk-ext-val</x:ref> = token / quoted-string
     4473<x:ref>chunk-size</x:ref> = 1*HEXDIG
     4474<x:ref>comment</x:ref> = "(" *( ctext / quoted-pair / comment ) ")"
     4475<x:ref>connection-token</x:ref> = token
     4476<x:ref>ctext</x:ref> = *( OWS / %x21-27 / %x2A-7E / obs-text )
     4477
     4478<x:ref>date1</x:ref> = 2DIGIT SP month SP 4DIGIT
     4479<x:ref>date2</x:ref> = 2DIGIT "-" month "-" 2DIGIT
     4480<x:ref>date3</x:ref> = month SP ( 2DIGIT / ( SP DIGIT ) )
     4481
     4482<x:ref>entity-body</x:ref> = &lt;entity-body, defined in [Part3], Section 3.2&gt;
     4483<x:ref>entity-header</x:ref> = &lt;entity-header, defined in [Part3], Section 3.1&gt;
     4484
     4485<x:ref>field-content</x:ref> = *( WSP / VCHAR / obs-text )
     4486<x:ref>field-name</x:ref> = token
     4487<x:ref>field-value</x:ref> = *( field-content / OWS )
     4488<x:ref>fragment</x:ref> = &lt;fragment, defined in [RFC3986], Section 3.5&gt;
     4489
     4490<x:ref>general-header</x:ref> = Cache-Control / Connection / Date / Pragma / Trailer
     4491 / Transfer-Encoding / Upgrade / Via / Warning
     4492<x:ref>generic-message</x:ref> = start-line *( message-header CRLF ) CRLF [
     4493 message-body ]
     4494
     4495<x:ref>http-URI</x:ref> = "http://" authority path-abempty [ "?" query ]
     4496
     4497l-Fri = %x46.72.69.64.61.79
     4498l-Mon = %x4D.6F.6E.64.61.79
     4499l-Sat = %x53.61.74.75.72.64.61.79
     4500l-Sun = %x53.75.6E.64.61.79
     4501l-Thu = %x54.68.75.72.73.64.61.79
     4502l-Tue = %x54.75.65.73.64.61.79
     4503l-Wed = %x57.65.64.6E.65.73.64.61.79
     4504<x:ref>last-chunk</x:ref> = 1*"0" *WSP [ chunk-ext ] CRLF
     4505
     4506<x:ref>message-body</x:ref> = entity-body / &lt;entity-body encoded as per
     4507 Transfer-Encoding&gt;
     4508<x:ref>message-header</x:ref> = field-name ":" OWS [ field-value ] OWS
     4509<x:ref>month</x:ref> = s-Jan / s-Feb / s-Mar / s-Apr / s-May / s-Jun / s-Jul / s-Aug
     4510 / s-Sep / s-Oct / s-Nov / s-Dec
     4511
     4512<x:ref>obs-fold</x:ref> = CRLF
     4513<x:ref>obs-text</x:ref> = %x80-FF
     4514<x:ref>obsolete-date</x:ref> = rfc850-date / asctime-date
     4515
     4516<x:ref>parameter</x:ref> = attribute BWS "=" BWS value
     4517<x:ref>partial-URI</x:ref> = relative-part [ "?" query ]
     4518<x:ref>path-abempty</x:ref> = &lt;path-abempty, defined in [RFC3986], Section 3.3&gt;
     4519<x:ref>path-absolute</x:ref> = &lt;path-absolute, defined in [RFC3986], Section 3.3&gt;
     4520<x:ref>port</x:ref> = &lt;port, defined in [RFC3986], Section 3.2.3&gt;
     4521<x:ref>product</x:ref> = token [ "/" product-version ]
     4522<x:ref>product-version</x:ref> = token
     4523<x:ref>protocol-name</x:ref> = token
     4524<x:ref>protocol-version</x:ref> = token
     4525<x:ref>pseudonym</x:ref> = token
     4526
     4527<x:ref>qdtext</x:ref> = *( OWS / "!" / %x23-5B / %x5D-7E / obs-text )
     4528<x:ref>query</x:ref> = &lt;query, defined in [RFC3986], Section 3.4&gt;
     4529<x:ref>quoted-pair</x:ref> = "\" quoted-text
     4530<x:ref>quoted-string</x:ref> = DQUOTE *( qdtext / quoted-pair ) DQUOTE
     4531<x:ref>quoted-text</x:ref> = %x01-09 / %x0B-0C / %x0E-FF
     4532
     4533<x:ref>received-by</x:ref> = ( uri-host [ ":" port ] ) / pseudonym
     4534<x:ref>received-protocol</x:ref> = [ protocol-name "/" ] protocol-version
     4535<x:ref>relative-part</x:ref> = &lt;relative-part, defined in [RFC3986], Section 4.2&gt;
     4536<x:ref>request-header</x:ref> = &lt;request-header, defined in [Part2], Section 3&gt;
     4537<x:ref>request-target</x:ref> = "*" / absolute-URI / ( path-absolute [ "?" query ] )
     4538 / authority
     4539<x:ref>response-header</x:ref> = &lt;response-header, defined in [Part2], Section 5&gt;
     4540<x:ref>rfc1123-date</x:ref> = wkday "," SP date1 SP time SP GMT
     4541<x:ref>rfc850-date</x:ref> = weekday "," SP date2 SP time SP GMT
     4542
     4543s-Apr = %x41.70.72
     4544s-Aug = %x41.75.67
     4545s-Dec = %x44.65.63
     4546s-Feb = %x46.65.62
     4547s-Fri = %x46.72.69
     4548s-Jan = %x4A.61.6E
     4549s-Jul = %x4A.75.6C
     4550s-Jun = %x4A.75.6E
     4551s-Mar = %x4D.61.72
     4552s-May = %x4D.61.79
     4553s-Mon = %x4D.6F.6E
     4554s-Nov = %x4E.6F.76
     4555s-Oct = %x4F.63.74
     4556s-Sat = %x53.61.74
     4557s-Sep = %x53.65.70
     4558s-Sun = %x53.75.6E
     4559s-Thu = %x54.68.75
     4560s-Tue = %x54.75.65
     4561s-Wed = %x57.65.64
     4562<x:ref>start-line</x:ref> = Request-Line / Status-Line
     4563
     4564<x:ref>t-codings</x:ref> = "trailers" / ( transfer-extension [ accept-params ] )
     4565<x:ref>tchar</x:ref> = "!" / "#" / "$" / "%" / "&amp;" / "'" / "*" / "+" / "-" / "." /
     4566 "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
     4567<x:ref>time</x:ref> = 2DIGIT ":" 2DIGIT ":" 2DIGIT
     4568<x:ref>token</x:ref> = 1*tchar
     4569<x:ref>trailer-part</x:ref> = *( entity-header CRLF )
     4570<x:ref>transfer-coding</x:ref> = "chunked" / transfer-extension
     4571<x:ref>transfer-extension</x:ref> = token *( OWS ";" OWS parameter )
     4572
     4573<x:ref>uri-host</x:ref> = &lt;host, defined in [RFC3986], Section 3.2.2&gt;
     4574
     4575<x:ref>value</x:ref> = token / quoted-string
     4576
     4577<x:ref>weekday</x:ref> = l-Mon / l-Tue / l-Wed / l-Thu / l-Fri / l-Sat / l-Sun
     4578<x:ref>wkday</x:ref> = s-Mon / s-Tue / s-Wed / s-Thu / s-Fri / s-Sat / s-Sun
     4579
     4580; Chunked-Body defined but not used
     4581; Content-Length defined but not used
     4582; HTTP-message defined but not used
     4583; Host defined but not used
     4584; TE defined but not used
     4585; URI defined but not used
     4586; URI-reference defined but not used
     4587; fragment defined but not used
     4588; generic-message defined but not used
     4589; http-URI defined but not used
     4590; partial-URI defined but not used
     4591
     4592
     4593</artwork>
     4594</figure>
    43694595</section>
    43704596
     
    44744700    </t>
    44754701    <t>
    4476       Use names of RFC4234 core rules DQUOTE and HTAB,
     4702      Use names of RFC4234 core rules DQUOTE and WSP,
    44774703      fix broken ABNF for chunk-data
    44784704      (work in progress on <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/36"/>)
     
    45214747    </t>
    45224748    <t>
    4523       Synchronize core rules with RFC5234 (this includes a change to CHAR
    4524       which now excludes NUL).
     4749      Synchronize core rules with RFC5234.
    45254750    </t>
    45264751    <t>
     
    46634888  <list style="symbols">
    46644889    <t>
     4890      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/30"/>:
     4891      "Header LWS"
     4892    </t>
     4893    <t>
     4894      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/52"/>:
     4895      "Sort 1.3 Terminology"
     4896    </t>
     4897    <t>
     4898      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/63"/>:
     4899      "RFC2047 encoded words"
     4900    </t>
     4901    <t>
     4902      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/74"/>:
     4903      "Character Encodings in TEXT"
     4904    </t>
     4905    <t>
     4906      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/77"/>:
     4907      "Line Folding"
     4908    </t>
     4909    <t>
     4910      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/83"/>:
     4911      "OPTIONS * and proxies"
     4912    </t>
     4913    <t>
     4914      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/94"/>:
     4915      "Reason-Phrase BNF"
     4916    </t>
     4917    <t>
     4918      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/111"/>:
     4919      "Use of TEXT"
     4920    </t>
     4921    <t>
    46654922      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/118"/>:
    46664923      "Join "Differences Between HTTP Entities and RFC 2045 Entities"?"
     
    46724929  </list>
    46734930</t>
     4931<t>
     4932  Ongoing work on ABNF conversion (<eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/36"/>):
     4933  <list style="symbols">
     4934    <t>
     4935      Rewrite definition of list rules, deprecate empty list elements.
     4936    </t>
     4937    <t>
     4938      Add appendix containing collected and expanded ABNF.
     4939    </t>
     4940  </list>
     4941</t>
     4942<t>
     4943  Other changes:
     4944  <list style="symbols">
     4945    <t>
     4946      Rewrite introduction; add mostly new Architecture Section.
     4947    </t>
     4948  </list>
     4949</t>
    46744950</section>
    46754951
  • draft-ietf-httpbis/latest-roy/p2-semantics.html

    r348 r437  
    333333  }
    334334  @top-right {
    335        content: "November 2008";
     335       content: "December 2008";
    336336  }
    337337  @top-center {
     
    365365      <link rel="Index" href="#rfc.index">
    366366      <link rel="Chapter" title="1 Introduction" href="#rfc.section.1">
    367       <link rel="Chapter" title="2 Notational Conventions and Generic Grammar" href="#rfc.section.2">
    368       <link rel="Chapter" title="3 Method" href="#rfc.section.3">
    369       <link rel="Chapter" title="4 Request Header Fields" href="#rfc.section.4">
    370       <link rel="Chapter" title="5 Status Code and Reason Phrase" href="#rfc.section.5">
    371       <link rel="Chapter" title="6 Response Header Fields" href="#rfc.section.6">
    372       <link rel="Chapter" title="7 Entity" href="#rfc.section.7">
    373       <link rel="Chapter" title="8 Method Definitions" href="#rfc.section.8">
    374       <link rel="Chapter" title="9 Status Code Definitions" href="#rfc.section.9">
    375       <link rel="Chapter" title="10 Header Field Definitions" href="#rfc.section.10">
    376       <link rel="Chapter" title="11 IANA Considerations" href="#rfc.section.11">
    377       <link rel="Chapter" title="12 Security Considerations" href="#rfc.section.12">
    378       <link rel="Chapter" title="13 Acknowledgments" href="#rfc.section.13">
    379       <link rel="Chapter" href="#rfc.section.14" title="14 References">
     367      <link rel="Chapter" title="2 Method" href="#rfc.section.2">
     368      <link rel="Chapter" title="3 Request Header Fields" href="#rfc.section.3">
     369      <link rel="Chapter" title="4 Status Code and Reason Phrase" href="#rfc.section.4">
     370      <link rel="Chapter" title="5 Response Header Fields" href="#rfc.section.5">
     371      <link rel="Chapter" title="6 Entity" href="#rfc.section.6">
     372      <link rel="Chapter" title="7 Method Definitions" href="#rfc.section.7">
     373      <link rel="Chapter" title="8 Status Code Definitions" href="#rfc.section.8">
     374      <link rel="Chapter" title="9 Header Field Definitions" href="#rfc.section.9">
     375      <link rel="Chapter" title="10 IANA Considerations" href="#rfc.section.10">
     376      <link rel="Chapter" title="11 Security Considerations" href="#rfc.section.11">
     377      <link rel="Chapter" title="12 Acknowledgments" href="#rfc.section.12">
     378      <link rel="Chapter" href="#rfc.section.13" title="13 References">
    380379      <link rel="Appendix" title="A Compatibility with Previous Versions" href="#rfc.section.A">
    381       <link rel="Appendix" title="B Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.B">
     380      <link rel="Appendix" title="B Collected ABNF" href="#rfc.section.B">
     381      <link rel="Appendix" title="C Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.C">
    382382      <meta name="generator" content="http://greenbytes.de/tech/webdav/rfc2629.xslt, Revision 1.400, 2008-10-10 14:04:14, XSLT vendor: SAXON 8.9 from Saxonica http://www.saxonica.com/">
    383383      <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/">
     
    392392      <meta name="DC.Creator" content="Reschke, J. F.">
    393393      <meta name="DC.Identifier" content="urn:ietf:id:draft-ietf-httpbis-p2-semantics-latest">
    394       <meta name="DC.Date.Issued" scheme="ISO8601" content="2008-11">
     394      <meta name="DC.Date.Issued" scheme="ISO8601" content="2008-12">
    395395      <meta name="DC.Relation.Replaces" content="urn:ietf:rfc:2616">
    396396      <meta name="DC.Description.Abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 2 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 2 defines the semantics of HTTP messages as expressed by request methods, request-header fields, response status codes, and response-header fields.">
     
    428428         </tr>
    429429         <tr>
    430             <td class="header left">Expires: May 2009</td>
     430            <td class="header left">Expires: June 2009</td>
    431431            <td class="header right">H. Frystyk</td>
    432432         </tr>
     
    477477         <tr>
    478478            <td class="header left"></td>
    479             <td class="header right">November 12, 2008</td>
     479            <td class="header right">December 11, 2008</td>
    480480         </tr>
    481481      </table>
     
    497497      <p>The list of Internet-Draft Shadow Directories can be accessed at &lt;<a href="http://www.ietf.org/shadow.html">http://www.ietf.org/shadow.html</a>&gt;.
    498498      </p>
    499       <p>This Internet-Draft will expire in May 2009.</p>
     499      <p>This Internet-Draft will expire in June 2009.</p>
    500500      <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
    501501      <p>The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
     
    509509         list is at &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/report/11">http://tools.ietf.org/wg/httpbis/trac/report/11</a>&gt; and related documents (including fancy diffs) can be found at &lt;<a href="http://tools.ietf.org/wg/httpbis/">http://tools.ietf.org/wg/httpbis/</a>&gt;.
    510510      </p> 
    511       <p>The changes in this draft are summarized in <a href="#changes.since.04" title="Since draft-ietf-httpbis-p2-semantics-04">Appendix&nbsp;B.6</a>.
     511      <p>The changes in this draft are summarized in <a href="#changes.since.05" title="Since draft-ietf-httpbis-p2-semantics-05">Appendix&nbsp;C.7</a>.
    512512      </p>
    513513      <hr class="noprint">
     
    516516         <li class="tocline0">1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a><ul class="toc">
    517517               <li class="tocline1">1.1&nbsp;&nbsp;&nbsp;<a href="#intro.requirements">Requirements</a></li>
    518             </ul>
    519          </li>
    520          <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#notation">Notational Conventions and Generic Grammar</a></li>
    521          <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#method">Method</a><ul class="toc">
    522                <li class="tocline1">3.1&nbsp;&nbsp;&nbsp;<a href="#method.registry">Method Registry</a></li>
    523             </ul>
    524          </li>
    525          <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#request.header.fields">Request Header Fields</a></li>
    526          <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a><ul class="toc">
    527                <li class="tocline1">5.1&nbsp;&nbsp;&nbsp;<a href="#status.code.registry">Status Code Registry</a></li>
    528             </ul>
    529          </li>
    530          <li class="tocline0">6.&nbsp;&nbsp;&nbsp;<a href="#response.header.fields">Response Header Fields</a></li>
    531          <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#entity">Entity</a></li>
    532          <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#method.definitions">Method Definitions</a><ul class="toc">
    533                <li class="tocline1">8.1&nbsp;&nbsp;&nbsp;<a href="#safe.and.idempotent">Safe and Idempotent Methods</a><ul class="toc">
    534                      <li class="tocline1">8.1.1&nbsp;&nbsp;&nbsp;<a href="#safe.methods">Safe Methods</a></li>
    535                      <li class="tocline1">8.1.2&nbsp;&nbsp;&nbsp;<a href="#idempotent.methods">Idempotent Methods</a></li>
    536                   </ul>
    537                </li>
    538                <li class="tocline1">8.2&nbsp;&nbsp;&nbsp;<a href="#OPTIONS">OPTIONS</a></li>
    539                <li class="tocline1">8.3&nbsp;&nbsp;&nbsp;<a href="#GET">GET</a></li>
    540                <li class="tocline1">8.4&nbsp;&nbsp;&nbsp;<a href="#HEAD">HEAD</a></li>
    541                <li class="tocline1">8.5&nbsp;&nbsp;&nbsp;<a href="#POST">POST</a></li>
    542                <li class="tocline1">8.6&nbsp;&nbsp;&nbsp;<a href="#PUT">PUT</a></li>
    543                <li class="tocline1">8.7&nbsp;&nbsp;&nbsp;<a href="#DELETE">DELETE</a></li>
    544                <li class="tocline1">8.8&nbsp;&nbsp;&nbsp;<a href="#TRACE">TRACE</a></li>
    545                <li class="tocline1">8.9&nbsp;&nbsp;&nbsp;<a href="#CONNECT">CONNECT</a></li>
    546             </ul>
    547          </li>
    548          <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#status.codes">Status Code Definitions</a><ul class="toc">
    549                <li class="tocline1">9.1&nbsp;&nbsp;&nbsp;<a href="#status.1xx">Informational 1xx</a><ul class="toc">
    550                      <li class="tocline1">9.1.1&nbsp;&nbsp;&nbsp;<a href="#status.100">100 Continue</a></li>
    551                      <li class="tocline1">9.1.2&nbsp;&nbsp;&nbsp;<a href="#status.101">101 Switching Protocols</a></li>
    552                   </ul>
    553                </li>
    554                <li class="tocline1">9.2&nbsp;&nbsp;&nbsp;<a href="#status.2xx">Successful 2xx</a><ul class="toc">
    555                      <li class="tocline1">9.2.1&nbsp;&nbsp;&nbsp;<a href="#status.200">200 OK</a></li>
    556                      <li class="tocline1">9.2.2&nbsp;&nbsp;&nbsp;<a href="#status.201">201 Created</a></li>
    557                      <li class="tocline1">9.2.3&nbsp;&nbsp;&nbsp;<a href="#status.202">202 Accepted</a></li>
    558                      <li class="tocline1">9.2.4&nbsp;&nbsp;&nbsp;<a href="#status.203">203 Non-Authoritative Information</a></li>
    559                      <li class="tocline1">9.2.5&nbsp;&nbsp;&nbsp;<a href="#status.204">204 No Content</a></li>
    560                      <li class="tocline1">9.2.6&nbsp;&nbsp;&nbsp;<a href="#status.205">205 Reset Content</a></li>
    561                      <li class="tocline1">9.2.7&nbsp;&nbsp;&nbsp;<a href="#status.206">206 Partial Content</a></li>
    562                   </ul>
    563                </li>
    564                <li class="tocline1">9.3&nbsp;&nbsp;&nbsp;<a href="#status.3xx">Redirection 3xx</a><ul class="toc">
    565                      <li class="tocline1">9.3.1&nbsp;&nbsp;&nbsp;<a href="#status.300">300 Multiple Choices</a></li>
    566                      <li class="tocline1">9.3.2&nbsp;&nbsp;&nbsp;<a href="#status.301">301 Moved Permanently</a></li>
    567                      <li class="tocline1">9.3.3&nbsp;&nbsp;&nbsp;<a href="#status.302">302 Found</a></li>
    568                      <li class="tocline1">9.3.4&nbsp;&nbsp;&nbsp;<a href="#status.303">303 See Other</a></li>
    569                      <li class="tocline1">9.3.5&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
    570                      <li class="tocline1">9.3.6&nbsp;&nbsp;&nbsp;<a href="#status.305">305 Use Proxy</a></li>
    571                      <li class="tocline1">9.3.7&nbsp;&nbsp;&nbsp;<a href="#status.306">306 (Unused)</a></li>
    572                      <li class="tocline1">9.3.8&nbsp;&nbsp;&nbsp;<a href="#status.307">307 Temporary Redirect</a></li>
    573                   </ul>
    574                </li>
    575                <li class="tocline1">9.4&nbsp;&nbsp;&nbsp;<a href="#status.4xx">Client Error 4xx</a><ul class="toc">
    576                      <li class="tocline1">9.4.1&nbsp;&nbsp;&nbsp;<a href="#status.400">400 Bad Request</a></li>
    577                      <li class="tocline1">9.4.2&nbsp;&nbsp;&nbsp;<a href="#status.401">401 Unauthorized</a></li>
    578                      <li class="tocline1">9.4.3&nbsp;&nbsp;&nbsp;<a href="#status.402">402 Payment Required</a></li>
    579                      <li class="tocline1">9.4.4&nbsp;&nbsp;&nbsp;<a href="#status.403">403 Forbidden</a></li>
    580                      <li class="tocline1">9.4.5&nbsp;&nbsp;&nbsp;<a href="#status.404">404 Not Found</a></li>
    581                      <li class="tocline1">9.4.6&nbsp;&nbsp;&nbsp;<a href="#status.405">405 Method Not Allowed</a></li>
    582                      <li class="tocline1">9.4.7&nbsp;&nbsp;&nbsp;<a href="#status.406">406 Not Acceptable</a></li>
    583                      <li class="tocline1">9.4.8&nbsp;&nbsp;&nbsp;<a href="#status.407">407 Proxy Authentication Required</a></li>
    584                      <li class="tocline1">9.4.9&nbsp;&nbsp;&nbsp;<a href="#status.408">408 Request Timeout</a></li>
    585                      <li class="tocline1">9.4.10&nbsp;&nbsp;&nbsp;<a href="#status.409">409 Conflict</a></li>
    586                      <li class="tocline1">9.4.11&nbsp;&nbsp;&nbsp;<a href="#status.410">410 Gone</a></li>
    587                      <li class="tocline1">9.4.12&nbsp;&nbsp;&nbsp;<a href="#status.411">411 Length Required</a></li>
    588                      <li class="tocline1">9.4.13&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
    589                      <li class="tocline1">9.4.14&nbsp;&nbsp;&nbsp;<a href="#status.413">413 Request Entity Too Large</a></li>
    590                      <li class="tocline1">9.4.15&nbsp;&nbsp;&nbsp;<a href="#status.414">414 Request-URI Too Long</a></li>
    591                      <li class="tocline1">9.4.16&nbsp;&nbsp;&nbsp;<a href="#status.415">415 Unsupported Media Type</a></li>
    592                      <li class="tocline1">9.4.17&nbsp;&nbsp;&nbsp;<a href="#status.416">416 Requested Range Not Satisfiable</a></li>
    593                      <li class="tocline1">9.4.18&nbsp;&nbsp;&nbsp;<a href="#status.417">417 Expectation Failed</a></li>
    594                   </ul>
    595                </li>
    596                <li class="tocline1">9.5&nbsp;&nbsp;&nbsp;<a href="#status.5xx">Server Error 5xx</a><ul class="toc">
    597                      <li class="tocline1">9.5.1&nbsp;&nbsp;&nbsp;<a href="#status.500">500 Internal Server Error</a></li>
    598                      <li class="tocline1">9.5.2&nbsp;&nbsp;&nbsp;<a href="#status.501">501 Not Implemented</a></li>
    599                      <li class="tocline1">9.5.3&nbsp;&nbsp;&nbsp;<a href="#status.502">502 Bad Gateway</a></li>
    600                      <li class="tocline1">9.5.4&nbsp;&nbsp;&nbsp;<a href="#status.503">503 Service Unavailable</a></li>
    601                      <li class="tocline1">9.5.5&nbsp;&nbsp;&nbsp;<a href="#status.504">504 Gateway Timeout</a></li>
    602                      <li class="tocline1">9.5.6&nbsp;&nbsp;&nbsp;<a href="#status.505">505 HTTP Version Not Supported</a></li>
     518               <li class="tocline1">1.2&nbsp;&nbsp;&nbsp;<a href="#notation">Syntax Notation</a><ul class="toc">
     519                     <li class="tocline1">1.2.1&nbsp;&nbsp;&nbsp;<a href="#core.rules">Core Rules</a></li>
     520                     <li class="tocline1">1.2.2&nbsp;&nbsp;&nbsp;<a href="#abnf.dependencies">ABNF Rules defined in other Parts of the Specification</a></li>
    603521                  </ul>
    604522               </li>
    605523            </ul>
    606524         </li>
    607          <li class="tocline0">10.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
    608                <li class="tocline1">10.1&nbsp;&nbsp;&nbsp;<a href="#header.allow">Allow</a></li>
    609                <li class="tocline1">10.2&nbsp;&nbsp;&nbsp;<a href="#header.expect">Expect</a></li>
    610                <li class="tocline1">10.3&nbsp;&nbsp;&nbsp;<a href="#header.from">From</a></li>
    611                <li class="tocline1">10.4&nbsp;&nbsp;&nbsp;<a href="#header.location">Location</a></li>
    612                <li class="tocline1">10.5&nbsp;&nbsp;&nbsp;<a href="#header.max-forwards">Max-Forwards</a></li>
    613                <li class="tocline1">10.6&nbsp;&nbsp;&nbsp;<a href="#header.referer">Referer</a></li>
    614                <li class="tocline1">10.7&nbsp;&nbsp;&nbsp;<a href="#header.retry-after">Retry-After</a></li>
    615                <li class="tocline1">10.8&nbsp;&nbsp;&nbsp;<a href="#header.server">Server</a></li>
    616                <li class="tocline1">10.9&nbsp;&nbsp;&nbsp;<a href="#header.user-agent">User-Agent</a></li>
     525         <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#method">Method</a><ul class="toc">
     526               <li class="tocline1">2.1&nbsp;&nbsp;&nbsp;<a href="#method.registry">Method Registry</a></li>
    617527            </ul>
    618528         </li>
    619          <li class="tocline0">11.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul class="toc">
    620                <li class="tocline1">11.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
    621                <li class="tocline1">11.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
    622                <li class="tocline1">11.3&nbsp;&nbsp;&nbsp;<a href="#message.header.registration">Message Header Registration</a></li>
     529         <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#request.header.fields">Request Header Fields</a></li>
     530         <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a><ul class="toc">
     531               <li class="tocline1">4.1&nbsp;&nbsp;&nbsp;<a href="#status.code.registry">Status Code Registry</a></li>
    623532            </ul>
    624533         </li>
    625          <li class="tocline0">12.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul class="toc">
    626                <li class="tocline1">12.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
    627                <li class="tocline1">12.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
    628                <li class="tocline1">12.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing">Location Headers and Spoofing</a></li>
     534         <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#response.header.fields">Response Header Fields</a></li>
     535         <li class="tocline0">6.&nbsp;&nbsp;&nbsp;<a href="#entity">Entity</a></li>
     536         <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#method.definitions">Method Definitions</a><ul class="toc">
     537               <li class="tocline1">7.1&nbsp;&nbsp;&nbsp;<a href="#safe.and.idempotent">Safe and Idempotent Methods</a><ul class="toc">
     538                     <li class="tocline1">7.1.1&nbsp;&nbsp;&nbsp;<a href="#safe.methods">Safe Methods</a></li>
     539                     <li class="tocline1">7.1.2&nbsp;&nbsp;&nbsp;<a href="#idempotent.methods">Idempotent Methods</a></li>
     540                  </ul>
     541               </li>
     542               <li class="tocline1">7.2&nbsp;&nbsp;&nbsp;<a href="#OPTIONS">OPTIONS</a></li>
     543               <li class="tocline1">7.3&nbsp;&nbsp;&nbsp;<a href="#GET">GET</a></li>
     544               <li class="tocline1">7.4&nbsp;&nbsp;&nbsp;<a href="#HEAD">HEAD</a></li>
     545               <li class="tocline1">7.5&nbsp;&nbsp;&nbsp;<a href="#POST">POST</a></li>
     546               <li class="tocline1">7.6&nbsp;&nbsp;&nbsp;<a href="#PUT">PUT</a></li>
     547               <li class="tocline1">7.7&nbsp;&nbsp;&nbsp;<a href="#DELETE">DELETE</a></li>
     548               <li class="tocline1">7.8&nbsp;&nbsp;&nbsp;<a href="#TRACE">TRACE</a></li>
     549               <li class="tocline1">7.9&nbsp;&nbsp;&nbsp;<a href="#CONNECT">CONNECT</a></li>
    629550            </ul>
    630551         </li>
    631          <li class="tocline0">13.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
    632          <li class="tocline0">14.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul class="toc">
    633                <li class="tocline1">14.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    634                <li class="tocline1">14.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     552         <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#status.codes">Status Code Definitions</a><ul class="toc">
     553               <li class="tocline1">8.1&nbsp;&nbsp;&nbsp;<a href="#status.1xx">Informational 1xx</a><ul class="toc">
     554                     <li class="tocline1">8.1.1&nbsp;&nbsp;&nbsp;<a href="#status.100">100 Continue</a></li>
     555                     <li class="tocline1">8.1.2&nbsp;&nbsp;&nbsp;<a href="#status.101">101 Switching Protocols</a></li>
     556                  </ul>
     557               </li>
     558               <li class="tocline1">8.2&nbsp;&nbsp;&nbsp;<a href="#status.2xx">Successful 2xx</a><ul class="toc">
     559                     <li class="tocline1">8.2.1&nbsp;&nbsp;&nbsp;<a href="#status.200">200 OK</a></li>
     560                     <li class="tocline1">8.2.2&nbsp;&nbsp;&nbsp;<a href="#status.201">201 Created</a></li>
     561                     <li class="tocline1">8.2.3&nbsp;&nbsp;&nbsp;<a href="#status.202">202 Accepted</a></li>
     562                     <li class="tocline1">8.2.4&nbsp;&nbsp;&nbsp;<a href="#status.203">203 Non-Authoritative Information</a></li>
     563                     <li class="tocline1">8.2.5&nbsp;&nbsp;&nbsp;<a href="#status.204">204 No Content</a></li>
     564                     <li class="tocline1">8.2.6&nbsp;&nbsp;&nbsp;<a href="#status.205">205 Reset Content</a></li>
     565                     <li class="tocline1">8.2.7&nbsp;&nbsp;&nbsp;<a href="#status.206">206 Partial Content</a></li>
     566                  </ul>
     567               </li>
     568               <li class="tocline1">8.3&nbsp;&nbsp;&nbsp;<a href="#status.3xx">Redirection 3xx</a><ul class="toc">
     569                     <li class="tocline1">8.3.1&nbsp;&nbsp;&nbsp;<a href="#status.300">300 Multiple Choices</a></li>
     570                     <li class="tocline1">8.3.2&nbsp;&nbsp;&nbsp;<a href="#status.301">301 Moved Permanently</a></li>
     571                     <li class="tocline1">8.3.3&nbsp;&nbsp;&nbsp;<a href="#status.302">302 Found</a></li>
     572                     <li class="tocline1">8.3.4&nbsp;&nbsp;&nbsp;<a href="#status.303">303 See Other</a></li>
     573                     <li class="tocline1">8.3.5&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
     574                     <li class="tocline1">8.3.6&nbsp;&nbsp;&nbsp;<a href="#status.305">305 Use Proxy</a></li>
     575                     <li class="tocline1">8.3.7&nbsp;&nbsp;&nbsp;<a href="#status.306">306 (Unused)</a></li>
     576                     <li class="tocline1">8.3.8&nbsp;&nbsp;&nbsp;<a href="#status.307">307 Temporary Redirect</a></li>
     577                  </ul>
     578               </li>
     579               <li class="tocline1">8.4&nbsp;&nbsp;&nbsp;<a href="#status.4xx">Client Error 4xx</a><ul class="toc">
     580                     <li class="tocline1">8.4.1&nbsp;&nbsp;&nbsp;<a href="#status.400">400 Bad Request</a></li>
     581                     <li class="tocline1">8.4.2&nbsp;&nbsp;&nbsp;<a href="#status.401">401 Unauthorized</a></li>
     582                     <li class="tocline1">8.4.3&nbsp;&nbsp;&nbsp;<a href="#status.402">402 Payment Required</a></li>
     583                     <li class="tocline1">8.4.4&nbsp;&nbsp;&nbsp;<a href="#status.403">403 Forbidden</a></li>
     584                     <li class="tocline1">8.4.5&nbsp;&nbsp;&nbsp;<a href="#status.404">404 Not Found</a></li>
     585                     <li class="tocline1">8.4.6&nbsp;&nbsp;&nbsp;<a href="#status.405">405 Method Not Allowed</a></li>
     586                     <li class="tocline1">8.4.7&nbsp;&nbsp;&nbsp;<a href="#status.406">406 Not Acceptable</a></li>
     587                     <li class="tocline1">8.4.8&nbsp;&nbsp;&nbsp;<a href="#status.407">407 Proxy Authentication Required</a></li>
     588                     <li class="tocline1">8.4.9&nbsp;&nbsp;&nbsp;<a href="#status.408">408 Request Timeout</a></li>
     589                     <li class="tocline1">8.4.10&nbsp;&nbsp;&nbsp;<a href="#status.409">409 Conflict</a></li>
     590                     <li class="tocline1">8.4.11&nbsp;&nbsp;&nbsp;<a href="#status.410">410 Gone</a></li>
     591                     <li class="tocline1">8.4.12&nbsp;&nbsp;&nbsp;<a href="#status.411">411 Length Required</a></li>
     592                     <li class="tocline1">8.4.13&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
     593                     <li class="tocline1">8.4.14&nbsp;&nbsp;&nbsp;<a href="#status.413">413 Request Entity Too Large</a></li>
     594                     <li class="tocline1">8.4.15&nbsp;&nbsp;&nbsp;<a href="#status.414">414 Request-target Too Long</a></li>
     595                     <li class="tocline1">8.4.16&nbsp;&nbsp;&nbsp;<a href="#status.415">415 Unsupported Media Type</a></li>
     596                     <li class="tocline1">8.4.17&nbsp;&nbsp;&nbsp;<a href="#status.416">416 Requested Range Not Satisfiable</a></li>
     597                     <li class="tocline1">8.4.18&nbsp;&nbsp;&nbsp;<a href="#status.417">417 Expectation Failed</a></li>
     598                  </ul>
     599               </li>
     600               <li class="tocline1">8.5&nbsp;&nbsp;&nbsp;<a href="#status.5xx">Server Error 5xx</a><ul class="toc">
     601                     <li class="tocline1">8.5.1&nbsp;&nbsp;&nbsp;<a href="#status.500">500 Internal Server Error</a></li>
     602                     <li class="tocline1">8.5.2&nbsp;&nbsp;&nbsp;<a href="#status.501">501 Not Implemented</a></li>
     603                     <li class="tocline1">8.5.3&nbsp;&nbsp;&nbsp;<a href="#status.502">502 Bad Gateway</a></li>
     604                     <li class="tocline1">8.5.4&nbsp;&nbsp;&nbsp;<a href="#status.503">503 Service Unavailable</a></li>
     605                     <li class="tocline1">8.5.5&nbsp;&nbsp;&nbsp;<a href="#status.504">504 Gateway Timeout</a></li>
     606                     <li class="tocline1">8.5.6&nbsp;&nbsp;&nbsp;<a href="#status.505">505 HTTP Version Not Supported</a></li>
     607                  </ul>
     608               </li>
     609            </ul>
     610         </li>
     611         <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
     612               <li class="tocline1">9.1&nbsp;&nbsp;&nbsp;<a href="#header.allow">Allow</a></li>
     613               <li class="tocline1">9.2&nbsp;&nbsp;&nbsp;<a href="#header.expect">Expect</a></li>
     614               <li class="tocline1">9.3&nbsp;&nbsp;&nbsp;<a href="#header.from">From</a></li>
     615               <li class="tocline1">9.4&nbsp;&nbsp;&nbsp;<a href="#header.location">Location</a></li>
     616               <li class="tocline1">9.5&nbsp;&nbsp;&nbsp;<a href="#header.max-forwards">Max-Forwards</a></li>
     617               <li class="tocline1">9.6&nbsp;&nbsp;&nbsp;<a href="#header.referer">Referer</a></li>
     618               <li class="tocline1">9.7&nbsp;&nbsp;&nbsp;<a href="#header.retry-after">Retry-After</a></li>
     619               <li class="tocline1">9.8&nbsp;&nbsp;&nbsp;<a href="#header.server">Server</a></li>
     620               <li class="tocline1">9.9&nbsp;&nbsp;&nbsp;<a href="#header.user-agent">User-Agent</a></li>
     621            </ul>
     622         </li>
     623         <li class="tocline0">10.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul class="toc">
     624               <li class="tocline1">10.1&nbsp;&nbsp;&nbsp;<a href="#method.registration">Method Registry</a></li>
     625               <li class="tocline1">10.2&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registry</a></li>
     626               <li class="tocline1">10.3&nbsp;&nbsp;&nbsp;<a href="#message.header.registration">Message Header Registration</a></li>
     627            </ul>
     628         </li>
     629         <li class="tocline0">11.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul class="toc">
     630               <li class="tocline1">11.1&nbsp;&nbsp;&nbsp;<a href="#security.sensitive">Transfer of Sensitive Information</a></li>
     631               <li class="tocline1">11.2&nbsp;&nbsp;&nbsp;<a href="#encoding.sensitive.information.in.uris">Encoding Sensitive Information in URIs</a></li>
     632               <li class="tocline1">11.3&nbsp;&nbsp;&nbsp;<a href="#location.spoofing">Location Headers and Spoofing</a></li>
     633            </ul>
     634         </li>
     635         <li class="tocline0">12.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
     636         <li class="tocline0">13.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul class="toc">
     637               <li class="tocline1">13.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     638               <li class="tocline1">13.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    635639            </ul>
    636640         </li>
     
    641645            </ul>
    642646         </li>
    643          <li class="tocline0">B.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul class="toc">
    644                <li class="tocline1">B.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.1">Since RFC2616</a></li>
    645                <li class="tocline1">B.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.2">Since draft-ietf-httpbis-p2-semantics-00</a></li>
    646                <li class="tocline1">B.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.3">Since draft-ietf-httpbis-p2-semantics-01</a></li>
    647                <li class="tocline1">B.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p2-semantics-02</a></li>
    648                <li class="tocline1">B.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p2-semantics-03</a></li>
    649                <li class="tocline1">B.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p2-semantics-04</a></li>
     647         <li class="tocline0">B.&nbsp;&nbsp;&nbsp;<a href="#collected.abnf">Collected ABNF</a></li>
     648         <li class="tocline0">C.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul class="toc">
     649               <li class="tocline1">C.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.1">Since RFC2616</a></li>
     650               <li class="tocline1">C.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.2">Since draft-ietf-httpbis-p2-semantics-00</a></li>
     651               <li class="tocline1">C.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.3">Since draft-ietf-httpbis-p2-semantics-01</a></li>
     652               <li class="tocline1">C.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p2-semantics-02</a></li>
     653               <li class="tocline1">C.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p2-semantics-03</a></li>
     654               <li class="tocline1">C.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p2-semantics-04</a></li>
     655               <li class="tocline1">C.7&nbsp;&nbsp;&nbsp;<a href="#changes.since.05">Since draft-ietf-httpbis-p2-semantics-05</a></li>
    650656            </ul>
    651657         </li>
     
    671677      <p id="rfc.section.1.1.p.2">An implementation is not compliant if it fails to satisfy one or more of the <em class="bcp14">MUST</em> or <em class="bcp14">REQUIRED</em> level requirements for the protocols it implements. An implementation that satisfies all the <em class="bcp14">MUST</em> or <em class="bcp14">REQUIRED</em> level and all the <em class="bcp14">SHOULD</em> level requirements for its protocols is said to be "unconditionally compliant"; one that satisfies all the <em class="bcp14">MUST</em> level requirements but not all the <em class="bcp14">SHOULD</em> level requirements for its protocols is said to be "conditionally compliant."
    672678      </p>
    673       <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="notation" href="#notation">Notational Conventions and Generic Grammar</a></h1>
    674       <p id="rfc.section.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation.abnf" title="ABNF Extensions">Section 1.2.1</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> and the core rules defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</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>: <span class="comment">[abnf.dep: ABNF syntax and basic rules will be adopted from RFC 5234, see &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;.]</span>
    675       </p>
    676       <div id="rfc.figure.u.1"></div><pre class="inline">  <a href="#notation" class="smpl">DIGIT</a>         = &lt;DIGIT, 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>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
    677 </pre><div id="rfc.figure.u.2"></div><pre class="inline">  <a href="#notation" class="smpl">comment</a>       = &lt;comment, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
    678   <a href="#notation" class="smpl">quoted-string</a> = &lt;quoted-string, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
    679   <a href="#notation" class="smpl">token</a>         = &lt;token, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
    680 </pre><div id="abnf.dependencies">
    681          <p id="rfc.section.2.p.4">                                                  The ABNF rules below are defined in other parts:</p>
    682       </div>
    683       <div id="rfc.figure.u.3"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">absoluteURI</a>   = &lt;absoluteURI, 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#uri" title="Uniform Resource Identifiers">Section 2.1</a>&gt;
    684   <a href="#abnf.dependencies" class="smpl">fragment</a>      = &lt;fragment, 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#uri" title="Uniform Resource Identifiers">Section 2.1</a>&gt;
    685   <a href="#abnf.dependencies" class="smpl">Host</a>          = &lt;Host, 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#header.host" title="Host">Section 8.4</a>&gt;
    686   <a href="#abnf.dependencies" class="smpl">HTTP-date</a>     = &lt;HTTP-date, 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#full.date" title="Full Date">Section 3.2.1</a>&gt;
    687   <a href="#abnf.dependencies" class="smpl">product</a>       = &lt;product, 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#product.tokens" title="Product Tokens">Section 3.4</a>&gt;
    688   <a href="#abnf.dependencies" class="smpl">relativeURI</a>   = &lt;relativeURI, 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 2.1</a>&gt;
    689   <a href="#abnf.dependencies" class="smpl">TE</a>            = &lt;TE, 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#header.upgrade" title="Upgrade">Section 8.8</a>&gt;
    690 </pre><div id="rfc.figure.u.4"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Accept</a>        = &lt;Accept, defined in <a href="#Part3" id="rfc.xref.Part3.1"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 6.1</a>&gt;
     679      <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>
     680      <p id="rfc.section.1.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation" title="Syntax Notation">Section 1.2</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>. The following core rules are included by reference, as defined in <a href="#RFC5234" id="rfc.xref.RFC5234.1"><cite title="Augmented BNF for Syntax Specifications: ABNF">[RFC5234]</cite></a>, <a href="http://tools.ietf.org/html/rfc5234#section-B.1">Appendix B.1</a>: ALPHA (letters), CR (carriage return), CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote), HEXDIG
     681         (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit sequence of data), SP (space), VCHAR (any visible USASCII character),
     682         and WSP (whitespace).
     683      </p>
     684      <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>
     685      <p id="rfc.section.1.2.1.p.1">The core rules below are defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</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>:
     686      </p>
     687      <div id="rfc.figure.u.1"></div><pre class="inline">  <a href="#core.rules" class="smpl">comment</a>       = &lt;comment, 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>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     688  <a href="#core.rules" class="smpl">quoted-string</a> = &lt;quoted-string, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     689  <a href="#core.rules" class="smpl">token</a>         = &lt;token, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     690  <a href="#core.rules" class="smpl">OWS</a>           = &lt;OWS, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     691  <a href="#core.rules" class="smpl">RWS</a>           = &lt;RWS, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     692  <a href="#core.rules" class="smpl">obs-text</a>      = &lt;obs-text, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>&gt;
     693</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>
     694      <p id="rfc.section.1.2.2.p.1">The ABNF rules below are defined in other parts:</p>
     695      <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.Part1.10"><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 2.1</a>&gt;
     696  <a href="#abnf.dependencies" class="smpl">fragment</a>      = &lt;fragment, 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 2.1</a>&gt;
     697  <a href="#abnf.dependencies" class="smpl">Host</a>          = &lt;Host, 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#uri" title="Uniform Resource Identifiers">Section 2.1</a>&gt;
     698  <a href="#abnf.dependencies" class="smpl">HTTP-date</a>     = &lt;HTTP-date, 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#full.date" title="Full Date">Section 3.2.1</a>&gt;
     699  <a href="#abnf.dependencies" class="smpl">partial-URI</a>   = &lt;partial-URI, 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#uri" title="Uniform Resource Identifiers">Section 2.1</a>&gt;
     700  <a href="#abnf.dependencies" class="smpl">product</a>       = &lt;product, 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#product.tokens" title="Product Tokens">Section 3.4</a>&gt;
     701  <a href="#abnf.dependencies" class="smpl">TE</a>            = &lt;TE, defined in <a href="#Part1" id="rfc.xref.Part1.16"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>&gt;
     702</pre><div id="rfc.figure.u.3"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Accept</a>        = &lt;Accept, defined in <a href="#Part3" id="rfc.xref.Part3.1"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 5.1</a>&gt;
    691703  <a href="#abnf.dependencies" class="smpl">Accept-Charset</a> =
    692              &lt;Accept-Charset, defined in <a href="#Part3" id="rfc.xref.Part3.2"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-charset" title="Accept-Charset">Section 6.2</a>&gt;
     704             &lt;Accept-Charset, defined in <a href="#Part3" id="rfc.xref.Part3.2"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-charset" title="Accept-Charset">Section 5.2</a>&gt;
    693705  <a href="#abnf.dependencies" class="smpl">Accept-Encoding</a> =
    694              &lt;Accept-Encoding, defined in <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-encoding" title="Accept-Encoding">Section 6.3</a>&gt;
     706             &lt;Accept-Encoding, defined in <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-encoding" title="Accept-Encoding">Section 5.3</a>&gt;
    695707  <a href="#abnf.dependencies" class="smpl">Accept-Language</a> =
    696              &lt;Accept-Language, defined in <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-language" title="Accept-Language">Section 6.4</a>&gt;
    697 </pre><div id="rfc.figure.u.5"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">ETag</a>          = &lt;ETag, defined in <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 7.1</a>&gt;
    698   <a href="#abnf.dependencies" class="smpl">If-Match</a>      = &lt;If-Match, defined in <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 7.2</a>&gt;
     708             &lt;Accept-Language, defined in <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-language" title="Accept-Language">Section 5.4</a>&gt;
     709</pre><div id="rfc.figure.u.4"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">ETag</a>          = &lt;ETag, defined in <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a>&gt;
     710  <a href="#abnf.dependencies" class="smpl">If-Match</a>      = &lt;If-Match, defined in <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 6.2</a>&gt;
    699711  <a href="#abnf.dependencies" class="smpl">If-Modified-Since</a> =
    700              &lt;If-Modified-Since, defined in <a href="#Part4" id="rfc.xref.Part4.3"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 7.3</a>&gt;
    701   <a href="#abnf.dependencies" class="smpl">If-None-Match</a> = &lt;If-None-Match, defined in <a href="#Part4" id="rfc.xref.Part4.4"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 7.4</a>&gt;
     712             &lt;If-Modified-Since, defined in <a href="#Part4" id="rfc.xref.Part4.3"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 6.3</a>&gt;
     713  <a href="#abnf.dependencies" class="smpl">If-None-Match</a> = &lt;If-None-Match, defined in <a href="#Part4" id="rfc.xref.Part4.4"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 6.4</a>&gt;
    702714  <a href="#abnf.dependencies" class="smpl">If-Unmodified-Since</a> =
    703              &lt;If-Unmodified-Since, defined in <a href="#Part4" id="rfc.xref.Part4.5"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 7.5</a>&gt;
    704 </pre><div id="rfc.figure.u.6"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Accept-Ranges</a> = &lt;Accept-Ranges, defined in <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.accept-ranges" title="Accept-Ranges">Section 6.1</a>&gt;
    705   <a href="#abnf.dependencies" class="smpl">If-Range</a>      = &lt;If-Range, defined in <a href="#Part5" id="rfc.xref.Part5.2"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.if-range" title="If-Range">Section 6.3</a>&gt;
    706   <a href="#abnf.dependencies" class="smpl">Range</a>         = &lt;Range, defined in <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.range" title="Range">Section 6.4</a>&gt;
    707 </pre><div id="rfc.figure.u.7"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Age</a>           = &lt;Age, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 16.1</a>&gt;
    708   <a href="#abnf.dependencies" class="smpl">Vary</a>          = &lt;Vary, defined in <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 16.5</a>&gt;
    709 </pre><div id="rfc.figure.u.8"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Authorization</a> = &lt;Authorization, defined in <a href="#Part7" id="rfc.xref.Part7.1"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.authorization" title="Authorization">Section 4.1</a>&gt;
     715             &lt;If-Unmodified-Since, defined in <a href="#Part4" id="rfc.xref.Part4.5"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 6.5</a>&gt;
     716</pre><div id="rfc.figure.u.5"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Accept-Ranges</a> = &lt;Accept-Ranges, defined in <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.accept-ranges" title="Accept-Ranges">Section 5.1</a>&gt;
     717  <a href="#abnf.dependencies" class="smpl">If-Range</a>      = &lt;If-Range, defined in <a href="#Part5" id="rfc.xref.Part5.2"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.if-range" title="If-Range">Section 5.3</a>&gt;
     718  <a href="#abnf.dependencies" class="smpl">Range</a>         = &lt;Range, defined in <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.range" title="Range">Section 5.4</a>&gt;
     719</pre><div id="rfc.figure.u.6"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Age</a>           = &lt;Age, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 4.1</a>&gt;
     720  <a href="#abnf.dependencies" class="smpl">Vary</a>          = &lt;Vary, defined in <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 4.5</a>&gt;
     721</pre><div id="rfc.figure.u.7"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Authorization</a> = &lt;Authorization, defined in <a href="#Part7" id="rfc.xref.Part7.1"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.authorization" title="Authorization">Section 3.1</a>&gt;
    710722  <a href="#abnf.dependencies" class="smpl">Proxy-Authenticate</a> =
    711              &lt;Proxy-Authenticate, defined in <a href="#Part7" id="rfc.xref.Part7.2"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authenticate" title="Proxy-Authenticate">Section 4.2</a>&gt;
     723             &lt;Proxy-Authenticate, defined in <a href="#Part7" id="rfc.xref.Part7.2"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authenticate" title="Proxy-Authenticate">Section 3.2</a>&gt;
    712724  <a href="#abnf.dependencies" class="smpl">Proxy-Authorization</a> =
    713              &lt;Proxy-Authorization, defined in <a href="#Part7" id="rfc.xref.Part7.3"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authorization" title="Proxy-Authorization">Section 4.3</a>&gt;
     725             &lt;Proxy-Authorization, defined in <a href="#Part7" id="rfc.xref.Part7.3"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authorization" title="Proxy-Authorization">Section 3.3</a>&gt;
    714726  <a href="#abnf.dependencies" class="smpl">WWW-Authenticate</a> =
    715              &lt;WWW-Authenticate, defined in <a href="#Part7" id="rfc.xref.Part7.4"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.www-authenticate" title="WWW-Authenticate">Section 4.4</a>&gt;
    716 </pre><h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="method" href="#method">Method</a></h1>
    717       <p id="rfc.section.3.p.1">The Method token indicates the method to be performed on the resource identified by the Request-URI. The method is case-sensitive.</p>
    718       <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.1"></span><span id="rfc.iref.g.2"></span>  <a href="#method" class="smpl">Method</a>         = %x4F.50.54.49.4F.4E.53   ; "OPTIONS", <a href="#OPTIONS" id="rfc.xref.OPTIONS.1" title="OPTIONS">Section&nbsp;8.2</a>
    719                  / %x47.45.54               ; "GET", <a href="#GET" id="rfc.xref.GET.1" title="GET">Section&nbsp;8.3</a>
    720                  / %x48.45.41.44            ; "HEAD", <a href="#HEAD" id="rfc.xref.HEAD.1" title="HEAD">Section&nbsp;8.4</a>
    721                  / %x50.4F.53.54            ; "POST", <a href="#POST" id="rfc.xref.POST.1" title="POST">Section&nbsp;8.5</a>
    722                  / %x50.55.54               ; "PUT", <a href="#PUT" id="rfc.xref.PUT.1" title="PUT">Section&nbsp;8.6</a>
    723                  / %x44.45.4C.45.54.45      ; "DELETE", <a href="#DELETE" id="rfc.xref.DELETE.1" title="DELETE">Section&nbsp;8.7</a>
    724                  / %x54.52.41.43.45         ; "TRACE", <a href="#TRACE" id="rfc.xref.TRACE.1" title="TRACE">Section&nbsp;8.8</a>
    725                  / %x43.4F.4E.4E.45.43.54   ; "CONNECT", <a href="#CONNECT" id="rfc.xref.CONNECT.1" title="CONNECT">Section&nbsp;8.9</a>
     727             &lt;WWW-Authenticate, defined in <a href="#Part7" id="rfc.xref.Part7.4"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.www-authenticate" title="WWW-Authenticate">Section 3.4</a>&gt;
     728</pre><h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="method" href="#method">Method</a></h1>
     729      <p id="rfc.section.2.p.1">The Method token indicates the method to be performed on the resource identified by the request-target. The method is case-sensitive.</p>
     730      <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.1"></span><span id="rfc.iref.g.2"></span>  <a href="#method" class="smpl">Method</a>         = %x4F.50.54.49.4F.4E.53   ; "OPTIONS", <a href="#OPTIONS" id="rfc.xref.OPTIONS.1" title="OPTIONS">Section&nbsp;7.2</a>
     731                 / %x47.45.54               ; "GET", <a href="#GET" id="rfc.xref.GET.1" title="GET">Section&nbsp;7.3</a>
     732                 / %x48.45.41.44            ; "HEAD", <a href="#HEAD" id="rfc.xref.HEAD.1" title="HEAD">Section&nbsp;7.4</a>
     733                 / %x50.4F.53.54            ; "POST", <a href="#POST" id="rfc.xref.POST.1" title="POST">Section&nbsp;7.5</a>
     734                 / %x50.55.54               ; "PUT", <a href="#PUT" id="rfc.xref.PUT.1" title="PUT">Section&nbsp;7.6</a>
     735                 / %x44.45.4C.45.54.45      ; "DELETE", <a href="#DELETE" id="rfc.xref.DELETE.1" title="DELETE">Section&nbsp;7.7</a>
     736                 / %x54.52.41.43.45         ; "TRACE", <a href="#TRACE" id="rfc.xref.TRACE.1" title="TRACE">Section&nbsp;7.8</a>
     737                 / %x43.4F.4E.4E.45.43.54   ; "CONNECT", <a href="#CONNECT" id="rfc.xref.CONNECT.1" title="CONNECT">Section&nbsp;7.9</a>
    726738                 / <a href="#method" class="smpl">extension-method</a>
    727   <a href="#method" class="smpl">extension-method</a> = <a href="#notation" class="smpl">token</a>
    728 </pre><p id="rfc.section.3.p.3">The list of methods allowed by a resource can be specified in an Allow header field (<a href="#header.allow" id="rfc.xref.header.allow.1" title="Allow">Section&nbsp;10.1</a>). The return code of the response always notifies the client whether a method is currently allowed on a resource, since the
     739  <a href="#method" class="smpl">extension-method</a> = <a href="#core.rules" class="smpl">token</a>
     740</pre><p id="rfc.section.2.p.3">The list of methods allowed by a resource can be specified in an Allow header field (<a href="#header.allow" id="rfc.xref.header.allow.1" title="Allow">Section&nbsp;9.1</a>). The return code of the response always notifies the client whether a method is currently allowed on a resource, since the
    729741         set of allowed methods can change dynamically. An origin server <em class="bcp14">SHOULD</em> return the status code 405 (Method Not Allowed) if the method is known by the origin server but not allowed for the requested
    730742         resource, and 501 (Not Implemented) if the method is unrecognized or not implemented by the origin server. The methods GET
    731          and HEAD <em class="bcp14">MUST</em> be supported by all general-purpose servers. All other methods are <em class="bcp14">OPTIONAL</em>; however, if the above methods are implemented, they <em class="bcp14">MUST</em> be implemented with the same semantics as those specified in <a href="#method.definitions" title="Method Definitions">Section&nbsp;8</a>.
    732       </p>
    733       <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="method.registry" href="#method.registry">Method Registry</a></h2>
    734       <p id="rfc.section.3.1.p.1">The HTTP Method Registry defines the name space for the Method token in the Request line of an HTTP request.</p>
    735       <p id="rfc.section.3.1.p.2">Registrations <em class="bcp14">MUST</em> include the following fields:
     743         and HEAD <em class="bcp14">MUST</em> be supported by all general-purpose servers. All other methods are <em class="bcp14">OPTIONAL</em>; however, if the above methods are implemented, they <em class="bcp14">MUST</em> be implemented with the same semantics as those specified in <a href="#method.definitions" title="Method Definitions">Section&nbsp;7</a>.
     744      </p>
     745      <h2 id="rfc.section.2.1"><a href="#rfc.section.2.1">2.1</a>&nbsp;<a id="method.registry" href="#method.registry">Method Registry</a></h2>
     746      <p id="rfc.section.2.1.p.1">The HTTP Method Registry defines the name space for the Method token in the Request line of an HTTP request.</p>
     747      <p id="rfc.section.2.1.p.2">Registrations <em class="bcp14">MUST</em> include the following fields:
    736748      </p>
    737749      <ul>
    738          <li>Method Name (see <a href="#method" title="Method">Section&nbsp;3</a>)
    739          </li>
    740          <li>Safe ("yes" or "no", see <a href="#safe.methods" title="Safe Methods">Section&nbsp;8.1.1</a>)
     750         <li>Method Name (see <a href="#method" title="Method">Section&nbsp;2</a>)
     751         </li>
     752         <li>Safe ("yes" or "no", see <a href="#safe.methods" title="Safe Methods">Section&nbsp;7.1.1</a>)
    741753         </li>
    742754         <li>Pointer to specification text</li>
    743755      </ul>
    744       <p id="rfc.section.3.1.p.3">Values to be added to this name space are subject to IETF review (<a href="#RFC5226" id="rfc.xref.RFC5226.1"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>). Any document registering new method names should be traceable through statuses of either 'Obsoletes' or 'Updates' to this
     756      <p id="rfc.section.2.1.p.3">Values to be added to this name space are subject to IETF review (<a href="#RFC5226" id="rfc.xref.RFC5226.1"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>). Any document registering new method names should be traceable through statuses of either 'Obsoletes' or 'Updates' to this
    745757         document.
    746758      </p>
    747       <p id="rfc.section.3.1.p.4">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt;.
    748       </p>
    749       <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="request.header.fields" href="#request.header.fields">Request Header Fields</a></h1>
    750       <p id="rfc.section.4.p.1">The request-header fields allow the client to pass additional information about the request, and about the client itself,
     759      <p id="rfc.section.2.1.p.4">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>&gt;.
     760      </p>
     761      <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="request.header.fields" href="#request.header.fields">Request Header Fields</a></h1>
     762      <p id="rfc.section.3.p.1">The request-header fields allow the client to pass additional information about the request, and about the client itself,
    751763         to the server. These fields act as request modifiers, with semantics equivalent to the parameters on a programming language
    752764         method invocation.
    753765      </p>
    754       <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.3"></span>  <a href="#request.header.fields" class="smpl">request-header</a> = <a href="#abnf.dependencies" class="smpl">Accept</a>                   ; <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 6.1</a>
    755                  / <a href="#abnf.dependencies" class="smpl">Accept-Charset</a>           ; <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-charset" title="Accept-Charset">Section 6.2</a>
    756                  / <a href="#abnf.dependencies" class="smpl">Accept-Encoding</a>          ; <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-encoding" title="Accept-Encoding">Section 6.3</a>
    757                  / <a href="#abnf.dependencies" class="smpl">Accept-Language</a>          ; <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-language" title="Accept-Language">Section 6.4</a>
    758                  / <a href="#abnf.dependencies" class="smpl">Authorization</a>            ; <a href="#Part7" id="rfc.xref.Part7.5"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.authorization" title="Authorization">Section 4.1</a>
    759                  / <a href="#header.expect" class="smpl">Expect</a>                   ; <a href="#header.expect" id="rfc.xref.header.expect.1" title="Expect">Section&nbsp;10.2</a>
    760                  / <a href="#header.from" class="smpl">From</a>                     ; <a href="#header.from" id="rfc.xref.header.from.1" title="From">Section&nbsp;10.3</a>
    761                  / <a href="#abnf.dependencies" class="smpl">Host</a>                     ; <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#header.host" title="Host">Section 8.4</a>
    762                  / <a href="#abnf.dependencies" class="smpl">If-Match</a>                 ; <a href="#Part4" id="rfc.xref.Part4.6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 7.2</a>
    763                  / <a href="#abnf.dependencies" class="smpl">If-Modified-Since</a>        ; <a href="#Part4" id="rfc.xref.Part4.7"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 7.3</a>
    764                  / <a href="#abnf.dependencies" class="smpl">If-None-Match</a>            ; <a href="#Part4" id="rfc.xref.Part4.8"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 7.4</a>
    765                  / <a href="#abnf.dependencies" class="smpl">If-Range</a>                 ; <a href="#Part5" id="rfc.xref.Part5.4"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.if-range" title="If-Range">Section 6.3</a>
    766                  / <a href="#abnf.dependencies" class="smpl">If-Unmodified-Since</a>      ; <a href="#Part4" id="rfc.xref.Part4.9"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 7.5</a>
    767                  / <a href="#header.max-forwards" class="smpl">Max-Forwards</a>             ; <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.1" title="Max-Forwards">Section&nbsp;10.5</a>
    768                  / <a href="#abnf.dependencies" class="smpl">Proxy-Authorization</a>      ; <a href="#Part7" id="rfc.xref.Part7.6"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authorization" title="Proxy-Authorization">Section 4.3</a>
    769                  / <a href="#abnf.dependencies" class="smpl">Range</a>                    ; <a href="#Part5" id="rfc.xref.Part5.5"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.range" title="Range">Section 6.4</a>
    770                  / <a href="#header.referer" class="smpl">Referer</a>                  ; <a href="#header.referer" id="rfc.xref.header.referer.1" title="Referer">Section&nbsp;10.6</a>
    771                  / <a href="#abnf.dependencies" class="smpl">TE</a>                       ; <a href="#Part1" id="rfc.xref.Part1.16"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>
    772                  / <a href="#header.user-agent" class="smpl">User-Agent</a>               ; <a href="#header.user-agent" id="rfc.xref.header.user-agent.1" title="User-Agent">Section&nbsp;10.9</a>
    773 </pre><p id="rfc.section.4.p.3">Request-header field names can be extended reliably only in combination with a change in the protocol version. However, new
     766      <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.3"></span>  <a href="#request.header.fields" class="smpl">request-header</a> = <a href="#abnf.dependencies" class="smpl">Accept</a>                   ; <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 5.1</a>
     767                 / <a href="#abnf.dependencies" class="smpl">Accept-Charset</a>           ; <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-charset" title="Accept-Charset">Section 5.2</a>
     768                 / <a href="#abnf.dependencies" class="smpl">Accept-Encoding</a>          ; <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-encoding" title="Accept-Encoding">Section 5.3</a>
     769                 / <a href="#abnf.dependencies" class="smpl">Accept-Language</a>          ; <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept-language" title="Accept-Language">Section 5.4</a>
     770                 / <a href="#abnf.dependencies" class="smpl">Authorization</a>            ; <a href="#Part7" id="rfc.xref.Part7.5"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.authorization" title="Authorization">Section 3.1</a>
     771                 / <a href="#header.expect" class="smpl">Expect</a>                   ; <a href="#header.expect" id="rfc.xref.header.expect.1" title="Expect">Section&nbsp;9.2</a>
     772                 / <a href="#header.from" class="smpl">From</a>                     ; <a href="#header.from" id="rfc.xref.header.from.1" title="From">Section&nbsp;9.3</a>
     773                 / <a href="#abnf.dependencies" class="smpl">Host</a>                     ; <a href="#Part1" id="rfc.xref.Part1.17"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.host" title="Host">Section 8.4</a>
     774                 / <a href="#abnf.dependencies" class="smpl">If-Match</a>                 ; <a href="#Part4" id="rfc.xref.Part4.6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 6.2</a>
     775                 / <a href="#abnf.dependencies" class="smpl">If-Modified-Since</a>        ; <a href="#Part4" id="rfc.xref.Part4.7"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 6.3</a>
     776                 / <a href="#abnf.dependencies" class="smpl">If-None-Match</a>            ; <a href="#Part4" id="rfc.xref.Part4.8"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 6.4</a>
     777                 / <a href="#abnf.dependencies" class="smpl">If-Range</a>                 ; <a href="#Part5" id="rfc.xref.Part5.4"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.if-range" title="If-Range">Section 5.3</a>
     778                 / <a href="#abnf.dependencies" class="smpl">If-Unmodified-Since</a>      ; <a href="#Part4" id="rfc.xref.Part4.9"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 6.5</a>
     779                 / <a href="#header.max-forwards" class="smpl">Max-Forwards</a>             ; <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.1" title="Max-Forwards">Section&nbsp;9.5</a>
     780                 / <a href="#abnf.dependencies" class="smpl">Proxy-Authorization</a>      ; <a href="#Part7" id="rfc.xref.Part7.6"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authorization" title="Proxy-Authorization">Section 3.3</a>
     781                 / <a href="#abnf.dependencies" class="smpl">Range</a>                    ; <a href="#Part5" id="rfc.xref.Part5.5"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.range" title="Range">Section 5.4</a>
     782                 / <a href="#header.referer" class="smpl">Referer</a>                  ; <a href="#header.referer" id="rfc.xref.header.referer.1" title="Referer">Section&nbsp;9.6</a>
     783                 / <a href="#abnf.dependencies" class="smpl">TE</a>                       ; <a href="#Part1" id="rfc.xref.Part1.18"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>
     784                 / <a href="#header.user-agent" class="smpl">User-Agent</a>               ; <a href="#header.user-agent" id="rfc.xref.header.user-agent.1" title="User-Agent">Section&nbsp;9.9</a>
     785</pre><p id="rfc.section.3.p.3">Request-header field names can be extended reliably only in combination with a change in the protocol version. However, new
    774786         or experimental header fields <em class="bcp14">MAY</em> be given the semantics of request-header fields if all parties in the communication recognize them to be request-header fields.
    775787         Unrecognized header fields are treated as entity-header fields.
    776788      </p>
    777       <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h1>
    778       <p id="rfc.section.5.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. The status
    779          codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;9</a>. The Reason-Phrase is intended to give a short textual description of the Status-Code. The Status-Code is intended for use
     789      <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h1>
     790      <p id="rfc.section.4.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. The status
     791         codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section&nbsp;8</a>. The Reason-Phrase is intended to give a short textual description of the Status-Code. The Status-Code is intended for use
    780792         by automata and the Reason-Phrase is intended for the human user. The client is not required to examine or display the Reason-Phrase.
    781793      </p>
    782       <p id="rfc.section.5.p.2">The individual values of the numeric status codes defined for HTTP/1.1, and an example set of corresponding Reason-Phrase's,
     794      <p id="rfc.section.4.p.2">The individual values of the numeric status codes defined for HTTP/1.1, and an example set of corresponding Reason-Phrase's,
    783795         are presented below. The reason phrases listed here are only recommendations -- they <em class="bcp14">MAY</em> be replaced by local equivalents without affecting the protocol.
    784796      </p>
    785       <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>  <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a>    =
    786          "100"  ; <a href="#status.100" id="rfc.xref.status.100.1" title="100 Continue">Section&nbsp;9.1.1</a>: Continue
    787        / "101"  ; <a href="#status.101" id="rfc.xref.status.101.1" title="101 Switching Protocols">Section&nbsp;9.1.2</a>: Switching Protocols
    788        / "200"  ; <a href="#status.200" id="rfc.xref.status.200.1" title="200 OK">Section&nbsp;9.2.1</a>: OK
    789        / "201"  ; <a href="#status.201" id="rfc.xref.status.201.1" title="201 Created">Section&nbsp;9.2.2</a>: Created
    790        / "202"  ; <a href="#status.202" id="rfc.xref.status.202.1" title="202 Accepted">Section&nbsp;9.2.3</a>: Accepted
    791        / "203"  ; <a href="#status.203" id="rfc.xref.status.203.1" title="203 Non-Authoritative Information">Section&nbsp;9.2.4</a>: Non-Authoritative Information
    792        / "204"  ; <a href="#status.204" id="rfc.xref.status.204.1" title="204 No Content">Section&nbsp;9.2.5</a>: No Content
    793        / "205"  ; <a href="#status.205" id="rfc.xref.status.205.1" title="205 Reset Content">Section&nbsp;9.2.6</a>: Reset Content
    794        / "206"  ; <a href="#status.206" id="rfc.xref.status.206.1" title="206 Partial Content">Section&nbsp;9.2.7</a>: Partial Content
    795        / "300"  ; <a href="#status.300" id="rfc.xref.status.300.1" title="300 Multiple Choices">Section&nbsp;9.3.1</a>: Multiple Choices
    796        / "301"  ; <a href="#status.301" id="rfc.xref.status.301.1" title="301 Moved Permanently">Section&nbsp;9.3.2</a>: Moved Permanently
    797        / "302"  ; <a href="#status.302" id="rfc.xref.status.302.1" title="302 Found">Section&nbsp;9.3.3</a>: Found
    798        / "303"  ; <a href="#status.303" id="rfc.xref.status.303.1" title="303 See Other">Section&nbsp;9.3.4</a>: See Other
    799        / "304"  ; <a href="#status.304" id="rfc.xref.status.304.1" title="304 Not Modified">Section&nbsp;9.3.5</a>: Not Modified
    800        / "305"  ; <a href="#status.305" id="rfc.xref.status.305.1" title="305 Use Proxy">Section&nbsp;9.3.6</a>: Use Proxy
    801        / "307"  ; <a href="#status.307" id="rfc.xref.status.307.1" title="307 Temporary Redirect">Section&nbsp;9.3.8</a>: Temporary Redirect
    802        / "400"  ; <a href="#status.400" id="rfc.xref.status.400.1" title="400 Bad Request">Section&nbsp;9.4.1</a>: Bad Request
    803        / "401"  ; <a href="#status.401" id="rfc.xref.status.401.1" title="401 Unauthorized">Section&nbsp;9.4.2</a>: Unauthorized
    804        / "402"  ; <a href="#status.402" id="rfc.xref.status.402.1" title="402 Payment Required">Section&nbsp;9.4.3</a>: Payment Required
    805        / "403"  ; <a href="#status.403" id="rfc.xref.status.403.1" title="403 Forbidden">Section&nbsp;9.4.4</a>: Forbidden
    806        / "404"  ; <a href="#status.404" id="rfc.xref.status.404.1" title="404 Not Found">Section&nbsp;9.4.5</a>: Not Found
    807        / "405"  ; <a href="#status.405" id="rfc.xref.status.405.1" title="405 Method Not Allowed">Section&nbsp;9.4.6</a>: Method Not Allowed
    808        / "406"  ; <a href="#status.406" id="rfc.xref.status.406.1" title="406 Not Acceptable">Section&nbsp;9.4.7</a>: Not Acceptable
    809        / "407"  ; <a href="#status.407" id="rfc.xref.status.407.1" title="407 Proxy Authentication Required">Section&nbsp;9.4.8</a>: Proxy Authentication Required
    810        / "408"  ; <a href="#status.408" id="rfc.xref.status.408.1" title="408 Request Timeout">Section&nbsp;9.4.9</a>: Request Time-out
    811        / "409"  ; <a href="#status.409" id="rfc.xref.status.409.1" title="409 Conflict">Section&nbsp;9.4.10</a>: Conflict
    812        / "410"  ; <a href="#status.410" id="rfc.xref.status.410.1" title="410 Gone">Section&nbsp;9.4.11</a>: Gone
    813        / "411"  ; <a href="#status.411" id="rfc.xref.status.411.1" title="411 Length Required">Section&nbsp;9.4.12</a>: Length Required
    814        / "412"  ; <a href="#status.412" id="rfc.xref.status.412.1" title="412 Precondition Failed">Section&nbsp;9.4.13</a>: Precondition Failed
    815        / "413"  ; <a href="#status.413" id="rfc.xref.status.413.1" title="413 Request Entity Too Large">Section&nbsp;9.4.14</a>: Request Entity Too Large
    816        / "414"  ; <a href="#status.414" id="rfc.xref.status.414.1" title="414 Request-URI Too Long">Section&nbsp;9.4.15</a>: Request-URI Too Large
    817        / "415"  ; <a href="#status.415" id="rfc.xref.status.415.1" title="415 Unsupported Media Type">Section&nbsp;9.4.16</a>: Unsupported Media Type
    818        / "416"  ; <a href="#status.416" id="rfc.xref.status.416.1" title="416 Requested Range Not Satisfiable">Section&nbsp;9.4.17</a>: Requested range not satisfiable
    819        / "417"  ; <a href="#status.417" id="rfc.xref.status.417.1" title="417 Expectation Failed">Section&nbsp;9.4.18</a>: Expectation Failed
    820        / "500"  ; <a href="#status.500" id="rfc.xref.status.500.1" title="500 Internal Server Error">Section&nbsp;9.5.1</a>: Internal Server Error
    821        / "501"  ; <a href="#status.501" id="rfc.xref.status.501.1" title="501 Not Implemented">Section&nbsp;9.5.2</a>: Not Implemented
    822        / "502"  ; <a href="#status.502" id="rfc.xref.status.502.1" title="502 Bad Gateway">Section&nbsp;9.5.3</a>: Bad Gateway
    823        / "503"  ; <a href="#status.503" id="rfc.xref.status.503.1" title="503 Service Unavailable">Section&nbsp;9.5.4</a>: Service Unavailable
    824        / "504"  ; <a href="#status.504" id="rfc.xref.status.504.1" title="504 Gateway Timeout">Section&nbsp;9.5.5</a>: Gateway Time-out
    825        / "505"  ; <a href="#status.505" id="rfc.xref.status.505.1" title="505 HTTP Version Not Supported">Section&nbsp;9.5.6</a>: HTTP Version not supported
    826        / <a href="#request.header.fields" class="smpl">extension-code</a>
    827 
    828   <a href="#request.header.fields" class="smpl">extension-code</a> = 3<a href="#notation" class="smpl">DIGIT</a>
    829   <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a>  = *&lt;TEXT, excluding CR, LF&gt;
    830 </pre><p id="rfc.section.5.p.4">HTTP status codes are extensible. HTTP applications are not required to understand the meaning of all registered status codes,
     797      <div id="rfc.figure.u.10"></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>  <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a>    =
     798         "100"  ; <a href="#status.100" id="rfc.xref.status.100.1" title="100 Continue">Section&nbsp;8.1.1</a>: Continue
     799       / "101"  ; <a href="#status.101" id="rfc.xref.status.101.1" title="101 Switching Protocols">Section&nbsp;8.1.2</a>: Switching Protocols
     800       / "200"  ; <a href="#status.200" id="rfc.xref.status.200.1" title="200 OK">Section&nbsp;8.2.1</a>: OK
     801       / "201"  ; <a href="#status.201" id="rfc.xref.status.201.1" title="201 Created">Section&nbsp;8.2.2</a>: Created
     802       / "202"  ; <a href="#status.202" id="rfc.xref.status.202.1" title="202 Accepted">Section&nbsp;8.2.3</a>: Accepted
     803       / "203"  ; <a href="#status.203" id="rfc.xref.status.203.1" title="203 Non-Authoritative Information">Section&nbsp;8.2.4</a>: Non-Authoritative Information
     804       / "204"  ; <a href="#status.204" id="rfc.xref.status.204.1" title="204 No Content">Section&nbsp;8.2.5</a>: No Content
     805       / "205"  ; <a href="#status.205" id="rfc.xref.status.205.1" title="205 Reset Content">Section&nbsp;8.2.6</a>: Reset Content
     806       / "206"  ; <a href="#status.206" id="rfc.xref.status.206.1" title="206 Partial Content">Section&nbsp;8.2.7</a>: Partial Content
     807       / "300"  ; <a href="#status.300" id="rfc.xref.status.300.1" title="300 Multiple Choices">Section&nbsp;8.3.1</a>: Multiple Choices
     808       / "301"  ; <a href="#status.301" id="rfc.xref.status.301.1" title="301 Moved Permanently">Section&nbsp;8.3.2</a>: Moved Permanently
     809       / "302"  ; <a href="#status.302" id="rfc.xref.status.302.1" title="302 Found">Section&nbsp;8.3.3</a>: Found
     810       / "303"  ; <a href="#status.303" id="rfc.xref.status.303.1" title="303 See Other">Section&nbsp;8.3.4</a>: See Other
     811       / "304"  ; <a href="#status.304" id="rfc.xref.status.304.1" title="304 Not Modified">Section&nbsp;8.3.5</a>: Not Modified
     812       / "305"  ; <a href="#status.305" id="rfc.xref.status.305.1" title="305 Use Proxy">Section&nbsp;8.3.6</a>: Use Proxy
     813       / "307"  ; <a href="#status.307" id="rfc.xref.status.307.1" title="307 Temporary Redirect">Section&nbsp;8.3.8</a>: Temporary Redirect
     814       / "400"  ; <a href="#status.400" id="rfc.xref.status.400.1" title="400 Bad Request">Section&nbsp;8.4.1</a>: Bad Request
     815       / "401"  ; <a href="#status.401" id="rfc.xref.status.401.1" title="401 Unauthorized">Section&nbsp;8.4.2</a>: Unauthorized
     816       / "402"  ; <a href="#status.402" id="rfc.xref.status.402.1" title="402 Payment Required">Section&nbsp;8.4.3</a>: Payment Required
     817       / "403"  ; <a href="#status.403" id="rfc.xref.status.403.1" title="403 Forbidden">Section&nbsp;8.4.4</a>: Forbidden
     818       / "404"  ; <a href="#status.404" id="rfc.xref.status.404.1" title="404 Not Found">Section&nbsp;8.4.5</a>: Not Found
     819       / "405"  ; <a href="#status.405" id="rfc.xref.status.405.1" title="405 Method Not Allowed">Section&nbsp;8.4.6</a>: Method Not Allowed
     820       / "406"  ; <a href="#status.406" id="rfc.xref.status.406.1" title="406 Not Acceptable">Section&nbsp;8.4.7</a>: Not Acceptable
     821       / "407"  ; <a href="#status.407" id="rfc.xref.status.407.1" title="407 Proxy Authentication Required">Section&nbsp;8.4.8</a>: Proxy Authentication Required
     822       / "408"  ; <a href="#status.408" id="rfc.xref.status.408.1" title="408 Request Timeout">Section&nbsp;8.4.9</a>: Request Time-out
     823       / "409"  ; <a href="#status.409" id="rfc.xref.status.409.1" title="409 Conflict">Section&nbsp;8.4.10</a>: Conflict
     824       / "410"  ; <a href="#status.410" id="rfc.xref.status.410.1" title="410 Gone">Section&nbsp;8.4.11</a>: Gone
     825       / "411"  ; <a href="#status.411" id="rfc.xref.status.411.1" title="411 Length Required">Section&nbsp;8.4.12</a>: Length Required
     826       / "412"  ; <a href="#status.412" id="rfc.xref.status.412.1" title="412 Precondition Failed">Section&nbsp;8.4.13</a>: Precondition Failed
     827       / "413"  ; <a href="#status.413" id="rfc.xref.status.413.1" title="413 Request Entity Too Large">Section&nbsp;8.4.14</a>: Request Entity Too Large
     828       / "414"  ; <a href="#status.414" id="rfc.xref.status.414.1" title="414 Request-target Too Long">Section&nbsp;8.4.15</a>: Request-target Too Long
     829       / "415"  ; <a href="#status.415" id="rfc.xref.status.415.1" title="415 Unsupported Media Type">Section&nbsp;8.4.16</a>: Unsupported Media Type
     830       / "416"  ; <a href="#status.416" id="rfc.xref.status.416.1" title="416 Requested Range Not Satisfiable">Section&nbsp;8.4.17</a>: Requested range not satisfiable
     831       / "417"  ; <a href="#status.417" id="rfc.xref.status.417.1" title="417 Expectation Failed">Section&nbsp;8.4.18</a>: Expectation Failed
     832       / "500"  ; <a href="#status.500" id="rfc.xref.status.500.1" title="500 Internal Server Error">Section&nbsp;8.5.1</a>: Internal Server Error
     833       / "501"  ; <a href="#status.501" id="rfc.xref.status.501.1" title="501 Not Implemented">Section&nbsp;8.5.2</a>: Not Implemented
     834       / "502"  ; <a href="#status.502" id="rfc.xref.status.502.1" title="502 Bad Gateway">Section&nbsp;8.5.3</a>: Bad Gateway
     835       / "503"  ; <a href="#status.503" id="rfc.xref.status.503.1" title="503 Service Unavailable">Section&nbsp;8.5.4</a>: Service Unavailable
     836       / "504"  ; <a href="#status.504" id="rfc.xref.status.504.1" title="504 Gateway Timeout">Section&nbsp;8.5.5</a>: Gateway Time-out
     837       / "505"  ; <a href="#status.505" id="rfc.xref.status.505.1" title="505 HTTP Version Not Supported">Section&nbsp;8.5.6</a>: HTTP Version not supported
     838       / <a href="#status.code.and.reason.phrase" class="smpl">extension-code</a>
     839
     840  <a href="#status.code.and.reason.phrase" class="smpl">extension-code</a> = 3<a href="#notation" class="smpl">DIGIT</a>
     841  <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a>  = *( <a href="#notation" class="smpl">WSP</a> / <a href="#notation" class="smpl">VCHAR</a> / <a href="#core.rules" class="smpl">obs-text</a> )
     842</pre><p id="rfc.section.4.p.4">HTTP status codes are extensible. HTTP applications are not required to understand the meaning of all registered status codes,
    831843         though such understanding is obviously desirable. However, applications <em class="bcp14">MUST</em> understand the class of any status code, as indicated by the first digit, and treat any unrecognized response as being equivalent
    832844         to the x00 status code of that class, with the exception that an unrecognized response <em class="bcp14">MUST NOT</em> be cached. For example, if an unrecognized status code of 431 is received by the client, it can safely assume that there was
     
    834846         which will explain the unusual status.
    835847      </p>
    836       <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="status.code.registry" href="#status.code.registry">Status Code Registry</a></h2>
    837       <p id="rfc.section.5.1.p.1">The HTTP Status Code Registry defines the name space for the Status-Code token in the Status line of an HTTP response.</p>
    838       <p id="rfc.section.5.1.p.2">Values to be added to this name space are subject to IETF review (<a href="#RFC5226" id="rfc.xref.RFC5226.2"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>). Any document registering new status codes should be traceable through statuses of either 'Obsoletes' or 'Updates' to this
     848      <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="status.code.registry" href="#status.code.registry">Status Code Registry</a></h2>
     849      <p id="rfc.section.4.1.p.1">The HTTP Status Code Registry defines the name space for the Status-Code token in the Status line of an HTTP response.</p>
     850      <p id="rfc.section.4.1.p.2">Values to be added to this name space are subject to IETF review (<a href="#RFC5226" id="rfc.xref.RFC5226.2"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>). Any document registering new status codes should be traceable through statuses of either 'Obsoletes' or 'Updates' to this
    839851         document.
    840852      </p>
    841       <p id="rfc.section.5.1.p.3">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt;.
    842       </p>
    843       <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="response.header.fields" href="#response.header.fields">Response Header Fields</a></h1>
    844       <p id="rfc.section.6.p.1">The response-header fields allow the server to pass additional information about the response which cannot be placed in the
     853      <p id="rfc.section.4.1.p.3">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt;.
     854      </p>
     855      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="response.header.fields" href="#response.header.fields">Response Header Fields</a></h1>
     856      <p id="rfc.section.5.p.1">The response-header fields allow the server to pass additional information about the response which cannot be placed in the
    845857         Status-Line. These header fields give information about the server and about further access to the resource identified by
    846          the Request-URI.
    847       </p>
    848       <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.7"></span>  <a href="#response.header.fields" class="smpl">response-header</a> = <a href="#abnf.dependencies" class="smpl">Accept-Ranges</a>           ; <a href="#Part5" id="rfc.xref.Part5.6"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.accept-ranges" title="Accept-Ranges">Section 6.1</a>
    849                   / <a href="#abnf.dependencies" class="smpl">Age</a>                     ; <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 16.1</a>
    850                   / <a href="#header.allow" class="smpl">Allow</a>                   ; <a href="#header.allow" id="rfc.xref.header.allow.2" title="Allow">Section&nbsp;10.1</a>
    851                   / <a href="#abnf.dependencies" class="smpl">ETag</a>                    ; <a href="#Part4" id="rfc.xref.Part4.10"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 7.1</a>
    852                   / <a href="#header.location" class="smpl">Location</a>                ; <a href="#header.location" id="rfc.xref.header.location.1" title="Location">Section&nbsp;10.4</a>
    853                   / <a href="#abnf.dependencies" class="smpl">Proxy-Authenticate</a>      ; <a href="#Part7" id="rfc.xref.Part7.7"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authenticate" title="Proxy-Authenticate">Section 4.2</a>
    854                   / <a href="#header.retry-after" class="smpl">Retry-After</a>             ; <a href="#header.retry-after" id="rfc.xref.header.retry-after.1" title="Retry-After">Section&nbsp;10.7</a>
    855                   / <a href="#header.server" class="smpl">Server</a>                  ; <a href="#header.server" id="rfc.xref.header.server.1" title="Server">Section&nbsp;10.8</a>
    856                   / <a href="#abnf.dependencies" class="smpl">Vary</a>                    ; <a href="#Part6" id="rfc.xref.Part6.4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 16.5</a>
    857                   / <a href="#abnf.dependencies" class="smpl">WWW-Authenticate</a>        ; <a href="#Part7" id="rfc.xref.Part7.8"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.www-authenticate" title="WWW-Authenticate">Section 4.4</a>
    858 </pre><p id="rfc.section.6.p.3">Response-header field names can be extended reliably only in combination with a change in the protocol version. However, new
     858         the request-target.
     859      </p>
     860      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.7"></span>  <a href="#response.header.fields" class="smpl">response-header</a> = <a href="#abnf.dependencies" class="smpl">Accept-Ranges</a>           ; <a href="#Part5" id="rfc.xref.Part5.6"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.accept-ranges" title="Accept-Ranges">Section 5.1</a>
     861                  / <a href="#abnf.dependencies" class="smpl">Age</a>                     ; <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 4.1</a>
     862                  / <a href="#header.allow" class="smpl">Allow</a>                   ; <a href="#header.allow" id="rfc.xref.header.allow.2" title="Allow">Section&nbsp;9.1</a>
     863                  / <a href="#abnf.dependencies" class="smpl">ETag</a>                    ; <a href="#Part4" id="rfc.xref.Part4.10"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a>
     864                  / <a href="#header.location" class="smpl">Location</a>                ; <a href="#header.location" id="rfc.xref.header.location.1" title="Location">Section&nbsp;9.4</a>
     865                  / <a href="#abnf.dependencies" class="smpl">Proxy-Authenticate</a>      ; <a href="#Part7" id="rfc.xref.Part7.7"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authenticate" title="Proxy-Authenticate">Section 3.2</a>
     866                  / <a href="#header.retry-after" class="smpl">Retry-After</a>             ; <a href="#header.retry-after" id="rfc.xref.header.retry-after.1" title="Retry-After">Section&nbsp;9.7</a>
     867                  / <a href="#header.server" class="smpl">Server</a>                  ; <a href="#header.server" id="rfc.xref.header.server.1" title="Server">Section&nbsp;9.8</a>
     868                  / <a href="#abnf.dependencies" class="smpl">Vary</a>                    ; <a href="#Part6" id="rfc.xref.Part6.4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 4.5</a>
     869                  / <a href="#abnf.dependencies" class="smpl">WWW-Authenticate</a>        ; <a href="#Part7" id="rfc.xref.Part7.8"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.www-authenticate" title="WWW-Authenticate">Section 3.4</a>
     870</pre><p id="rfc.section.5.p.3">Response-header field names can be extended reliably only in combination with a change in the protocol version. However, new
    859871         or experimental header fields <em class="bcp14">MAY</em> be given the semantics of response-header fields if all parties in the communication recognize them to be response-header
    860872         fields. Unrecognized header fields are treated as entity-header fields.
    861873      </p>
    862       <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="entity" href="#entity">Entity</a></h1>
    863       <p id="rfc.section.7.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer an entity if not otherwise restricted by the request method or response status code. An entity consists of entity-header
     874      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="entity" href="#entity">Entity</a></h1>
     875      <p id="rfc.section.6.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer an entity if not otherwise restricted by the request method or response status code. An entity consists of entity-header
    864876         fields and an entity-body, although some responses will only include the entity-headers. HTTP entity-body and entity-header
    865877         fields are defined in <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    866878      </p>
    867       <p id="rfc.section.7.p.2">An entity-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 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>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure
     879      <p id="rfc.section.6.p.2">An entity-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 4.3</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>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure
    868880         safe and proper transfer of the message.
    869881      </p>
    870       <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="method.definitions" href="#method.definitions">Method Definitions</a></h1>
    871       <p id="rfc.section.8.p.1">The set of common methods for HTTP/1.1 is defined below. Although this set can be expanded, additional methods cannot be assumed
     882      <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="method.definitions" href="#method.definitions">Method Definitions</a></h1>
     883      <p id="rfc.section.7.p.1">The set of common methods for HTTP/1.1 is defined below. Although this set can be expanded, additional methods cannot be assumed
    872884         to share the same semantics for separately extended clients and servers.
    873885      </p>
    874       <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="safe.and.idempotent" href="#safe.and.idempotent">Safe and Idempotent Methods</a></h2>
     886      <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="safe.and.idempotent" href="#safe.and.idempotent">Safe and Idempotent Methods</a></h2>
    875887      <div id="rfc.iref.s.1"></div>
    876       <h3 id="rfc.section.8.1.1"><a href="#rfc.section.8.1.1">8.1.1</a>&nbsp;<a id="safe.methods" href="#safe.methods">Safe Methods</a></h3>
    877       <p id="rfc.section.8.1.1.p.1">Implementors should be aware that the software represents the user in their interactions over the Internet, and should be
     888      <h3 id="rfc.section.7.1.1"><a href="#rfc.section.7.1.1">7.1.1</a>&nbsp;<a id="safe.methods" href="#safe.methods">Safe Methods</a></h3>
     889      <p id="rfc.section.7.1.1.p.1">Implementors should be aware that the software represents the user in their interactions over the Internet, and should be
    878890         careful to allow the user to be aware of any actions they might take which may have an unexpected significance to themselves
    879891         or others.
    880892      </p>
    881       <p id="rfc.section.8.1.1.p.2">In particular, the convention has been established that the GET and HEAD methods <em class="bcp14">SHOULD NOT</em> have the significance of taking an action other than retrieval. These methods ought to be considered "<dfn id="safe">safe</dfn>". This allows user agents to represent other methods, such as POST, PUT and DELETE, in a special way, so that the user is
     893      <p id="rfc.section.7.1.1.p.2">In particular, the convention has been established that the GET and HEAD methods <em class="bcp14">SHOULD NOT</em> have the significance of taking an action other than retrieval. These methods ought to be considered "<dfn id="safe">safe</dfn>". This allows user agents to represent other methods, such as POST, PUT and DELETE, in a special way, so that the user is
    882894         made aware of the fact that a possibly unsafe action is being requested.
    883895      </p>
    884       <p id="rfc.section.8.1.1.p.3">Naturally, it is not possible to ensure that the server does not generate side-effects as a result of performing a GET request;
     896      <p id="rfc.section.7.1.1.p.3">Naturally, it is not possible to ensure that the server does not generate side-effects as a result of performing a GET request;
    885897         in fact, some dynamic resources consider that a feature. The important distinction here is that the user did not request the
    886898         side-effects, so therefore cannot be held accountable for them.
    887899      </p>
    888900      <div id="rfc.iref.i.1"></div>
    889       <h3 id="rfc.section.8.1.2"><a href="#rfc.section.8.1.2">8.1.2</a>&nbsp;<a id="idempotent.methods" href="#idempotent.methods">Idempotent Methods</a></h3>
    890       <p id="rfc.section.8.1.2.p.1">Methods can also have the property of "idempotence" in that (aside from error or expiration issues) the side-effects of N
     901      <h3 id="rfc.section.7.1.2"><a href="#rfc.section.7.1.2">7.1.2</a>&nbsp;<a id="idempotent.methods" href="#idempotent.methods">Idempotent Methods</a></h3>
     902      <p id="rfc.section.7.1.2.p.1">Methods can also have the property of "idempotence" in that (aside from error or expiration issues) the side-effects of N
    891903         &gt; 0 identical requests is the same as for a single request. The methods GET, HEAD, PUT and DELETE share this property. Also,
    892904         the methods OPTIONS and TRACE <em class="bcp14">SHOULD NOT</em> have side effects, and so are inherently idempotent.
    893905      </p>
    894       <p id="rfc.section.8.1.2.p.2">However, it is possible that a sequence of several requests is non-idempotent, even if all of the methods executed in that
     906      <p id="rfc.section.7.1.2.p.2">However, it is possible that a sequence of several requests is non-idempotent, even if all of the methods executed in that
    895907         sequence are idempotent. (A sequence is idempotent if a single execution of the entire sequence always yields a result that
    896908         is not changed by a reexecution of all, or part, of that sequence.) For example, a sequence is non-idempotent if its result
    897909         depends on a value that is later modified in the same sequence.
    898910      </p>
    899       <p id="rfc.section.8.1.2.p.3">A sequence that never has side effects is idempotent, by definition (provided that no concurrent operations are being executed
     911      <p id="rfc.section.7.1.2.p.3">A sequence that never has side effects is idempotent, by definition (provided that no concurrent operations are being executed
    900912         on the same set of resources).
    901913      </p>
    902       <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a id="OPTIONS" href="#OPTIONS">OPTIONS</a></h2>
     914      <h2 id="rfc.section.7.2"><a href="#rfc.section.7.2">7.2</a>&nbsp;<a id="OPTIONS" href="#OPTIONS">OPTIONS</a></h2>
    903915      <div id="rfc.iref.o.1"></div>
    904916      <div id="rfc.iref.m.1"></div>
    905       <p id="rfc.section.8.2.p.1">The OPTIONS method represents a request for information about the communication options available on the request/response
    906          chain identified by the Request-URI. This method allows the client to determine the options and/or requirements associated
     917      <p id="rfc.section.7.2.p.1">The OPTIONS method represents a request for information about the communication options available on the request/response
     918         chain identified by the request-target. This method allows the client to determine the options and/or requirements associated
    907919         with a resource, or the capabilities of a server, without implying a resource action or initiating a resource retrieval.
    908920      </p>
    909       <p id="rfc.section.8.2.p.2">Responses to this method are not cacheable.</p>
    910       <p id="rfc.section.8.2.p.3">If the OPTIONS request includes an entity-body (as indicated by the presence of Content-Length or Transfer-Encoding), then
     921      <p id="rfc.section.7.2.p.2">Responses to this method are not cacheable.</p>
     922      <p id="rfc.section.7.2.p.3">If the OPTIONS request includes an entity-body (as indicated by the presence of Content-Length or Transfer-Encoding), then
    911923         the media type <em class="bcp14">MUST</em> be indicated by a Content-Type field. Although this specification does not define any use for such a body, future extensions
    912924    &