Ignore:
Timestamp:
02/09/11 01:20:56 (11 years ago)
Author:
fielding@…
Message:

(editorial) Move syntax requirements for the start-line into the section
on message parsing, including subsections for Request-Line and Status-Line,
but leaving the long description of request-target as a later
section that will eventually be renamed.

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

Legend:

Unmodified
Added
Removed

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

    r1431 r1432  
    570570         </li>
    571571         <li>3.&nbsp;&nbsp;&nbsp;<a href="#http.message">Message Format</a><ul>
    572                <li>3.1&nbsp;&nbsp;&nbsp;<a href="#start.line">Start Line</a></li>
     572               <li>3.1&nbsp;&nbsp;&nbsp;<a href="#start.line">Start Line</a><ul>
     573                     <li>3.1.1&nbsp;&nbsp;&nbsp;<a href="#request-line">Request-Line</a><ul>
     574                           <li>3.1.1.1&nbsp;&nbsp;&nbsp;<a href="#method">Method</a></li>
     575                           <li>3.1.1.2&nbsp;&nbsp;&nbsp;<a href="#request-target">request-target</a></li>
     576                        </ul>
     577                     </li>
     578                     <li>3.1.2&nbsp;&nbsp;&nbsp;<a href="#status-line">Status-Line</a><ul>
     579                           <li>3.1.2.1&nbsp;&nbsp;&nbsp;<a href="#status.code">Status Code</a></li>
     580                           <li>3.1.2.2&nbsp;&nbsp;&nbsp;<a href="#reason.phrase">Reason Phrase</a></li>
     581                        </ul>
     582                     </li>
     583                  </ul>
     584               </li>
    573585               <li>3.2&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Fields</a><ul>
    574586                     <li>3.2.1&nbsp;&nbsp;&nbsp;<a href="#field.parsing">Field Parsing</a></li>
    … …  
    583595         </li>
    584596         <li>4.&nbsp;&nbsp;&nbsp;<a href="#request">Request</a><ul>
    585                <li>4.1&nbsp;&nbsp;&nbsp;<a href="#request-line">Request-Line</a><ul>
    586                      <li>4.1.1&nbsp;&nbsp;&nbsp;<a href="#method">Method</a></li>
    587                      <li>4.1.2&nbsp;&nbsp;&nbsp;<a href="#request-target">request-target</a></li>
    588                   </ul>
    589                </li>
     597               <li>4.1&nbsp;&nbsp;&nbsp;<a href="#request-target-types">Types of Request Target</a></li>
    590598               <li>4.2&nbsp;&nbsp;&nbsp;<a href="#the.resource.identified.by.a.request">The Resource Identified by a Request</a></li>
    591599               <li>4.3&nbsp;&nbsp;&nbsp;<a href="#effective.request.uri">Effective Request URI</a></li>
    592600            </ul>
    593601         </li>
    594          <li>5.&nbsp;&nbsp;&nbsp;<a href="#response">Response</a><ul>
    595                <li>5.1&nbsp;&nbsp;&nbsp;<a href="#status-line">Status-Line</a><ul>
    596                      <li>5.1.1&nbsp;&nbsp;&nbsp;<a href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></li>
    597                   </ul>
    598                </li>
    599             </ul>
    600          </li>
     602         <li>5.&nbsp;&nbsp;&nbsp;<a href="#response">Response</a></li>
    601603         <li>6.&nbsp;&nbsp;&nbsp;<a href="#protocol.parameters">Protocol Parameters</a><ul>
    602604               <li>6.1&nbsp;&nbsp;&nbsp;<a href="#date.time.formats.full.date">Date/Time Formats: Full Date</a></li>
    … …  
    11991201         Likewise, the presence of such whitespace in a response might be ignored by some clients or cause others to cease parsing.
    12001202      </p>
    1201       <h2 id="rfc.section.3.2"><a href="#rfc.section.3.2">3.2</a>&nbsp;<a id="header.fields" href="#header.fields">Header Fields</a></h2>
     1203      <h3 id="rfc.section.3.1.1"><a href="#rfc.section.3.1.1">3.1.1</a>&nbsp;<a id="request-line" href="#request-line">Request-Line</a></h3>
     1204      <p id="rfc.section.3.1.1.p.1">The Request-Line begins with a method token, followed by a single space (SP), the request-target, another single space (SP),
     1205         the protocol version, and ending with CRLF.
     1206      </p>
     1207      <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.30"></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>
     1208</pre><h4 id="rfc.section.3.1.1.1"><a href="#rfc.section.3.1.1.1">3.1.1.1</a>&nbsp;<a id="method" href="#method">Method</a></h4>
     1209      <p id="rfc.section.3.1.1.1.p.1">The Method token indicates the request method to be performed on the target resource. The request method is case-sensitive.</p>
     1210      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  <a href="#method" class="smpl">Method</a>         = <a href="#rule.token.separators" class="smpl">token</a>
     1211</pre><p id="rfc.section.3.1.1.1.p.3">See <a href="p2-semantics.html#method" title="Method">Section 2</a> of <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a> for further information, such as the list of methods defined by this specification, the IANA registry, and considerations
     1212         for new methods.
     1213      </p>
     1214      <h4 id="rfc.section.3.1.1.2"><a href="#rfc.section.3.1.1.2">3.1.1.2</a>&nbsp;<a id="request-target" href="#request-target">request-target</a></h4>
     1215      <p id="rfc.section.3.1.1.2.p.1">The request-target identifies the target resource upon which to apply the request. The four options for request-target are
     1216         described in <a href="#request-target-types" title="Types of Request Target">Section&nbsp;4.1</a>.
     1217      </p>
     1218      <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  <a href="#request-target" class="smpl">request-target</a> = "*"
     1219                 / <a href="#uri" class="smpl">absolute-URI</a>
     1220                 / ( <a href="#uri" class="smpl">path-absolute</a> [ "?" <a href="#uri" class="smpl">query</a> ] )
     1221                 / <a href="#uri" class="smpl">authority</a>
     1222</pre><p id="rfc.section.3.1.1.2.p.3">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 code if the received request-target
     1223         would be longer than the server wishes to handle (see <a href="p2-semantics.html#status.414" title="414 URI Too Long">Section 7.4.15</a> of <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
     1224      </p>
     1225      <p id="rfc.section.3.1.1.2.p.4">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.
     1226      </p>
     1227      <div class="note" id="rfc.section.3.1.1.2.p.5">
     1228         <p> <b>Note:</b> Fragments (<a href="#RFC3986" id="rfc.xref.RFC3986.18"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-3.5">Section 3.5</a>) are not part of the request-target and thus will not be transmitted in an HTTP request.
     1229         </p>
     1230      </div>
     1231      <h3 id="rfc.section.3.1.2"><a href="#rfc.section.3.1.2">3.1.2</a>&nbsp;<a id="status-line" href="#status-line">Status-Line</a></h3>
     1232      <p id="rfc.section.3.1.2.p.1">The first line of a Response message is the Status-Line, consisting of the protocol version, a space (SP), the status code,
     1233         another space, a possibly-empty textual phrase describing the status code, and ending with CRLF.
     1234      </p>
     1235      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.33"></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" class="smpl">Status-Code</a> <a href="#core.rules" class="smpl">SP</a> <a href="#reason.phrase" class="smpl">Reason-Phrase</a> <a href="#core.rules" class="smpl">CRLF</a>
     1236</pre><h4 id="rfc.section.3.1.2.1"><a href="#rfc.section.3.1.2.1">3.1.2.1</a>&nbsp;<a id="status.code" href="#status.code">Status Code</a></h4>
     1237      <p id="rfc.section.3.1.2.1.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. See <a href="p2-semantics.html#status.code.and.reason.phrase" title="Status Code and Reason Phrase">Section 4</a> of <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a> for further information, such as the list of status codes defined by this specification, the IANA registry, and considerations
     1238         for new status codes.
     1239      </p>
     1240      <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.34"></span>  <a href="#status.code" class="smpl">Status-Code</a>    = 3<a href="#core.rules" class="smpl">DIGIT</a>
     1241</pre><p id="rfc.section.3.1.2.1.p.3">The first digit of the Status-Code defines the class of response. The last two digits do not have any categorization role.
     1242         There are 5 values for the first digit:
     1243      </p>
     1244      <ul>
     1245         <li>1xx: Informational - Request received, continuing process</li>
     1246         <li>2xx: Success - The action was successfully received, understood, and accepted</li>
     1247         <li>3xx: Redirection - Further action must be taken in order to complete the request</li>
     1248         <li>4xx: Client Error - The request contains bad syntax or cannot be fulfilled</li>
     1249         <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
     1250      </ul>
     1251      <h4 id="rfc.section.3.1.2.2"><a href="#rfc.section.3.1.2.2">3.1.2.2</a>&nbsp;<a id="reason.phrase" href="#reason.phrase">Reason Phrase</a></h4>
     1252      <p id="rfc.section.3.1.2.2.p.1">The Reason Phrase exists for the sole purpose of providing a textual description associated with the numeric status code,
     1253         out of deference to earlier Internet application protocols that were more frequently used with interactive text clients. A
     1254         client <em class="bcp14">SHOULD</em> ignore the content of the Reason Phrase.
     1255      </p>
     1256      <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.35"></span>  <a href="#reason.phrase" class="smpl">Reason-Phrase</a>  = *( <a href="#core.rules" class="smpl">HTAB</a> / <a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     1257</pre><h2 id="rfc.section.3.2"><a href="#rfc.section.3.2">3.2</a>&nbsp;<a id="header.fields" href="#header.fields">Header Fields</a></h2>
    12021258      <p id="rfc.section.3.2.p.1">Each HTTP header field consists of a case-insensitive field name followed by a colon (":"), optional whitespace, and the field
    12031259         value.
    12041260      </p>
    1205       <div id="rfc.figure.u.21"></div><pre class="inline"><span id="rfc.iref.g.30"></span><span id="rfc.iref.g.31"></span><span id="rfc.iref.g.32"></span><span id="rfc.iref.g.33"></span>  <a href="#header.fields" class="smpl">header-field</a>   = <a href="#header.fields" class="smpl">field-name</a> ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.fields" class="smpl">field-value</a> <a href="#rule.whitespace" class="smpl">BWS</a>
     1261      <div id="rfc.figure.u.27"></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>  <a href="#header.fields" class="smpl">header-field</a>   = <a href="#header.fields" class="smpl">field-name</a> ":" <a href="#rule.whitespace" class="smpl">OWS</a> <a href="#header.fields" class="smpl">field-value</a> <a href="#rule.whitespace" class="smpl">BWS</a>
    12061262  <a href="#header.fields" class="smpl">field-name</a>     = <a href="#rule.token.separators" class="smpl">token</a>
    12071263  <a href="#header.fields" class="smpl">field-value</a>    = *( <a href="#header.fields" class="smpl">field-content</a> / <a href="#rule.whitespace" class="smpl">obs-fold</a> )
    … …  
    12161272         them.
    12171273      </p>
    1218       <p id="rfc.section.3.2.p.5">New HTTP header fields <em class="bcp14">SHOULD</em> be registered with IANA according to the procedures in <a href="p2-semantics.html#considerations.for.creating.header.fields" title="Considerations for Creating Header Fields">Section 3.1</a> of <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>. Unrecognized header fields <em class="bcp14">MUST</em> be forwarded by a proxy unless the field-name is listed in the Connection header field (<a href="#header.connection" id="rfc.xref.header.connection.3" title="Connection">Section&nbsp;9.1</a>) or the proxy is specifically configured to block or otherwise transform such fields. Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored by other recipients.
     1274      <p id="rfc.section.3.2.p.5">New HTTP header fields <em class="bcp14">SHOULD</em> be registered with IANA according to the procedures in <a href="p2-semantics.html#considerations.for.creating.header.fields" title="Considerations for Creating Header Fields">Section 3.1</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>. Unrecognized header fields <em class="bcp14">MUST</em> be forwarded by a proxy unless the field-name is listed in the Connection header field (<a href="#header.connection" id="rfc.xref.header.connection.3" title="Connection">Section&nbsp;9.1</a>) or the proxy is specifically configured to block or otherwise transform such fields. Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored by other recipients.
    12191275      </p>
    12201276      <p id="rfc.section.3.2.p.6">The order in which header fields with differing field names are received is not significant. However, it is "good practice"
    … …  
    12641320         </p>
    12651321      </div>
    1266       <div id="rfc.figure.u.22"></div><pre class="inline"><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>  <a href="#rule.token.separators" class="smpl">word</a>           = <a href="#rule.token.separators" class="smpl">token</a> / <a href="#rule.quoted-string" class="smpl">quoted-string</a>
     1322      <div id="rfc.figure.u.28"></div><pre class="inline"><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>  <a href="#rule.token.separators" class="smpl">word</a>           = <a href="#rule.token.separators" class="smpl">token</a> / <a href="#rule.quoted-string" class="smpl">quoted-string</a>
    12671323
    12681324  <a href="#rule.token.separators" class="smpl">token</a>          = 1*<a href="#rule.token.separators" class="smpl">tchar</a>
    … …  
    12791335         <p id="rfc.section.3.2.3.p.3">      A string of text is parsed as a single word if it is quoted using double-quote marks.</p>
    12801336      </div>
    1281       <div id="rfc.figure.u.23"></div><pre class="inline"><span id="rfc.iref.g.38"></span><span id="rfc.iref.g.39"></span><span id="rfc.iref.g.40"></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>
     1337      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.44"></span><span id="rfc.iref.g.45"></span><span id="rfc.iref.g.46"></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>
    12821338  <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>
    12831339  <a href="#rule.quoted-string" class="smpl">obs-text</a>       = %x80-FF
    … …  
    12851341         <p id="rfc.section.3.2.3.p.5">  The backslash octet ("\") can be used as a single-octet quoting mechanism within quoted-string constructs:</p>
    12861342      </div>
    1287       <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.41"></span>  <a href="#rule.quoted-pair" class="smpl">quoted-pair</a>    = "\" ( <a href="#core.rules" class="smpl">HTAB</a> /<a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     1343      <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.47"></span>  <a href="#rule.quoted-pair" class="smpl">quoted-pair</a>    = "\" ( <a href="#core.rules" class="smpl">HTAB</a> /<a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
    12881344</pre><p id="rfc.section.3.2.3.p.7">Recipients that process the value of the quoted-string <em class="bcp14">MUST</em> handle a quoted-pair as if it were replaced by the octet following the backslash.
    12891345      </p>
    … …  
    12951351         </p>
    12961352      </div>
    1297       <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.42"></span><span id="rfc.iref.g.43"></span>  <a href="#rule.comment" class="smpl">comment</a>        = "(" *( <a href="#rule.comment" class="smpl">ctext</a> / <a href="#rule.quoted-cpair" class="smpl">quoted-cpair</a> / <a href="#rule.comment" class="smpl">comment</a> ) ")"
     1353      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.48"></span><span id="rfc.iref.g.49"></span>  <a href="#rule.comment" class="smpl">comment</a>        = "(" *( <a href="#rule.comment" class="smpl">ctext</a> / <a href="#rule.quoted-cpair" class="smpl">quoted-cpair</a> / <a href="#rule.comment" class="smpl">comment</a> ) ")"
    12981354  <a href="#rule.comment" class="smpl">ctext</a>          = <a href="#rule.whitespace" class="smpl">OWS</a> / %x21-27 / %x2A-5B / %x5D-7E / <a href="#rule.quoted-string" class="smpl">obs-text</a>
    12991355</pre><div id="rule.quoted-cpair">
    13001356         <p id="rfc.section.3.2.3.p.11">  The backslash octet ("\") can be used as a single-octet quoting mechanism within comment constructs:</p>
    13011357      </div>
    1302       <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.44"></span>  <a href="#rule.quoted-cpair" class="smpl">quoted-cpair</a>    = "\" ( <a href="#core.rules" class="smpl">HTAB</a> /<a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
     1358      <div id="rfc.figure.u.32"></div><pre class="inline"><span id="rfc.iref.g.50"></span>  <a href="#rule.quoted-cpair" class="smpl">quoted-cpair</a>    = "\" ( <a href="#core.rules" class="smpl">HTAB</a> /<a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
    13031359</pre><p id="rfc.section.3.2.3.p.13">Senders <em class="bcp14">SHOULD NOT</em> escape octets in comments that do not require escaping (i.e., other than the backslash octet "\" and the parentheses "(" and
    13041360         ")").
    … …  
    13061362      <h2 id="rfc.section.3.3"><a href="#rfc.section.3.3">3.3</a>&nbsp;<a id="message.body" href="#message.body">Message Body</a></h2>
    13071363      <p id="rfc.section.3.3.p.1">The message-body (if any) of an HTTP message is used to carry the payload body associated with the request or response.</p>
    1308       <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.45"></span>  <a href="#message.body" class="smpl">message-body</a> = *OCTET
     1364      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.51"></span>  <a href="#message.body" class="smpl">message-body</a> = *OCTET
    13091365</pre><p id="rfc.section.3.3.p.3">The message-body differs from the payload body only when a transfer-coding has been applied, as indicated by the Transfer-Encoding
    13101366         header field (<a href="#header.transfer-encoding" id="rfc.xref.header.transfer-encoding.1" title="Transfer-Encoding">Section&nbsp;9.7</a>). If more than one Transfer-Encoding header field is present in a message, the multiple field-values <em class="bcp14">MUST</em> be combined into one field-value, according to the algorithm defined in <a href="#header.fields" title="Header Fields">Section&nbsp;3.2</a>, before determining the message-body length.
    … …  
    13241380      </p>
    13251381      <p id="rfc.section.3.3.p.8">For response messages, whether or not a message-body is included with a message is dependent on both the request method and
    1326          the response status code (<a href="#status.code.and.reason.phrase" title="Status Code and Reason Phrase">Section&nbsp;5.1.1</a>). Responses to the HEAD request method never include a message-body because the associated response header fields (e.g.,
     1382         the response status code (<a href="#status.code" title="Status Code">Section&nbsp;3.1.2.1</a>). Responses to the HEAD request method never include a message-body because the associated response header fields (e.g.,
    13271383         Transfer-Encoding, Content-Length, etc.) only indicate what their values would have been if the request method had been GET.
    13281384         All 1xx (Informational), 204 (No Content), and 304 (Not Modified) responses <em class="bcp14">MUST NOT</em> include a message-body. All other responses do include a message-body, although the body <em class="bcp14">MAY</em> be of zero length.
    … …  
    14251481         signifying the end of the header block, and an optional message body.
    14261482      </p>
    1427       <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.46"></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;4.1</a>
     1483      <div id="rfc.figure.u.34"></div><pre class="inline"><span id="rfc.iref.g.52"></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;3.1.1</a>
    14281484                  *( <a href="#header.fields" class="smpl">header-field</a> <a href="#core.rules" class="smpl">CRLF</a> )    ; <a href="#header.fields" title="Header Fields">Section&nbsp;3.2</a>
    14291485                  <a href="#core.rules" class="smpl">CRLF</a>
    14301486                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;3.3</a>
    1431 </pre><h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="request-line" href="#request-line">Request-Line</a></h2>
    1432       <p id="rfc.section.4.1.p.1">The Request-Line begins with a method token, followed by a single space (SP), the request-target, another single space (SP),
    1433          the protocol version, and ending with CRLF.
    1434       </p>
    1435       <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.47"></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>
    1436 </pre><h3 id="rfc.section.4.1.1"><a href="#rfc.section.4.1.1">4.1.1</a>&nbsp;<a id="method" href="#method">Method</a></h3>
    1437       <p id="rfc.section.4.1.1.p.1">The Method token indicates the request method to be performed on the target resource. The request method is case-sensitive.</p>
    1438       <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.48"></span>  <a href="#method" class="smpl">Method</a>         = <a href="#rule.token.separators" class="smpl">token</a>
    1439 </pre><p id="rfc.section.4.1.1.p.3">See <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> for further information, such as the list of methods defined by this specification, the IANA registry, and considerations
    1440          for new methods.
    1441       </p>
    1442       <h3 id="rfc.section.4.1.2"><a href="#rfc.section.4.1.2">4.1.2</a>&nbsp;<a id="request-target" href="#request-target">request-target</a></h3>
    1443       <p id="rfc.section.4.1.2.p.1">The request-target identifies the target resource upon which to apply the request. In most cases, the user agent is provided
    1444          a URI reference from which it determines an absolute URI for identifying the target resource. When a request to the resource
    1445          is initiated, all or part of that URI is used to construct the HTTP request-target.
    1446       </p>
    1447       <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.49"></span>  <a href="#request-target" class="smpl">request-target</a> = "*"
    1448                  / <a href="#uri" class="smpl">absolute-URI</a>
    1449                  / ( <a href="#uri" class="smpl">path-absolute</a> [ "?" <a href="#uri" class="smpl">query</a> ] )
    1450                  / <a href="#uri" class="smpl">authority</a>
    1451 </pre><p id="rfc.section.4.1.2.p.3">The four options for request-target are dependent on the nature of the request.</p>
    1452       <p id="rfc.section.4.1.2.p.4"><span id="rfc.iref.a.2"></span> The asterisk "*" form of request-target, which <em class="bcp14">MUST NOT</em> be used with any request method other than OPTIONS, means that the request applies to the server as a whole (the listening
     1487</pre><h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="request-target-types" href="#request-target-types">Types of Request Target</a></h2>
     1488      <p id="rfc.section.4.1.p.1">In most cases, the user agent is provided a URI reference from which it determines an absolute URI for identifying the target
     1489         resource. When a request to the resource is initiated, all or part of that URI is used to construct the HTTP request-target.
     1490      </p>
     1491      <p id="rfc.section.4.1.p.2">The four options for request-target are dependent on the nature of the request.</p>
     1492      <p id="rfc.section.4.1.p.3"><span id="rfc.iref.a.2"></span> The asterisk "*" form of request-target, which <em class="bcp14">MUST NOT</em> be used with any request method other than OPTIONS, means that the request applies to the server as a whole (the listening
    14531493         process) rather than to a specific named resource at that server. For example,
    14541494      </p>
    1455       <div id="rfc.figure.u.32"></div><pre class="text2">OPTIONS * HTTP/1.1
    1456 </pre><p id="rfc.section.4.1.2.p.6"><span id="rfc.iref.a.3"></span> The "absolute-URI" form is <em class="bcp14">REQUIRED</em> when the request is being made to a proxy. The proxy is requested to either forward the request or service it from a valid
     1495      <div id="rfc.figure.u.35"></div><pre class="text2">OPTIONS * HTTP/1.1
     1496</pre><p id="rfc.section.4.1.p.5"><span id="rfc.iref.a.3"></span> The "absolute-URI" form is <em class="bcp14">REQUIRED</em> when the request is being made to a proxy. The proxy is requested to either forward the request or service it from a valid
    14571497         cache, and then 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
    14581498         loops, a proxy that forwards requests to other proxies <em class="bcp14">MUST</em> be able to recognize and exclude all of its own server names, including any aliases, local variations, and the numeric IP
    14591499         address. An example Request-Line would be:
    14601500      </p>
    1461       <div id="rfc.figure.u.33"></div><pre class="text2">GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
    1462 </pre><p id="rfc.section.4.1.2.p.8">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.
    1463       </p>
    1464       <p id="rfc.section.4.1.2.p.9">If a proxy receives a host name that 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.
    1465       </p>
    1466       <p id="rfc.section.4.1.2.p.10"><span id="rfc.iref.a.4"></span> The "authority form" is only used by the CONNECT request method (<a href="p2-semantics.html#CONNECT" title="CONNECT">Section 6.9</a> of <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    1467       </p>
    1468       <p id="rfc.section.4.1.2.p.11"><span id="rfc.iref.o.3"></span> The most common form of request-target is that used when making a request to an origin server ("origin form"). In this case,
     1501      <div id="rfc.figure.u.36"></div><pre class="text2">GET http://www.example.org/pub/WWW/TheProject.html HTTP/1.1
     1502</pre><p id="rfc.section.4.1.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.
     1503      </p>
     1504      <p id="rfc.section.4.1.p.8">If a proxy receives a host name that 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.
     1505      </p>
     1506      <p id="rfc.section.4.1.p.9"><span id="rfc.iref.a.4"></span> The "authority form" is only used by the CONNECT request method (<a href="p2-semantics.html#CONNECT" title="CONNECT">Section 6.9</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
     1507      </p>
     1508      <p id="rfc.section.4.1.p.10"><span id="rfc.iref.o.3"></span> The most common form of request-target is that used when making a request to an origin server ("origin form"). In this case,
    14691509         the absolute path and query components of the URI <em class="bcp14">MUST</em> be transmitted as the request-target, and the authority component <em class="bcp14">MUST</em> be transmitted in a Host header field. For example, a client wishing to retrieve a representation of the resource, as identified
    14701510         above, directly from the origin server would open (or reuse) a TCP connection to port 80 of the host "www.example.org" and
    14711511         send the lines:
    14721512      </p>
    1473       <div id="rfc.figure.u.34"></div><pre class="text2">GET /pub/WWW/TheProject.html HTTP/1.1
     1513      <div id="rfc.figure.u.37"></div><pre class="text2">GET /pub/WWW/TheProject.html HTTP/1.1
    14741514Host: www.example.org
    1475 </pre><p id="rfc.section.4.1.2.p.13">followed by the remainder of the Request. Note that the origin form of request-target always starts with an absolute path;
     1515</pre><p id="rfc.section.4.1.p.12">followed by the remainder of the Request. Note that the origin form of request-target always starts with an absolute path;
    14761516         if the target resource's URI path is empty, then an absolute path of "/" <em class="bcp14">MUST</em> be provided in the request-target.
    14771517      </p>
    1478       <p id="rfc.section.4.1.2.p.14">If a proxy receives an OPTIONS request with an absolute-URI form of request-target in which the URI has an empty path and
     1518      <p id="rfc.section.4.1.p.13">If a proxy receives an OPTIONS request with an absolute-URI form of request-target in which the URI has an empty path and
    14791519         no query component, then the last proxy on the request chain <em class="bcp14">MUST</em> use a request-target of "*" when it forwards the request to the indicated origin server.
    14801520      </p>
    1481       <div id="rfc.figure.u.35"></div>
     1521      <div id="rfc.figure.u.38"></div>
    14821522      <p>For example, the request</p><pre class="text2">OPTIONS http://www.example.org:8001 HTTP/1.1
    1483 </pre><div id="rfc.figure.u.36"></div>
     1523</pre><div id="rfc.figure.u.39"></div>
    14841524      <p>would be forwarded by the final proxy as</p><pre class="text2">OPTIONS * HTTP/1.1
    14851525Host: www.example.org:8001
    14861526</pre>  <p>after connecting to port 8001 of host "www.example.org".</p>
    1487       <p id="rfc.section.4.1.2.p.17">The request-target is transmitted in the format specified in <a href="#http.uri" title="http URI scheme">Section&nbsp;2.7.1</a>. If the request-target is percent-encoded (<a href="#RFC3986" id="rfc.xref.RFC3986.18"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-2.1">Section 2.1</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.
    1488       </p>
    1489       <p id="rfc.section.4.1.2.p.18">A non-transforming 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
     1527      <p id="rfc.section.4.1.p.16">The request-target is transmitted in the format specified in <a href="#http.uri" title="http URI scheme">Section&nbsp;2.7.1</a>. If the request-target is percent-encoded (<a href="#RFC3986" id="rfc.xref.RFC3986.19"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-2.1">Section 2.1</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.
     1528      </p>
     1529      <p id="rfc.section.4.1.p.17">A non-transforming 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
    14901530         above to replace a null path-absolute with "/" or "*".
    14911531      </p>
    1492       <div class="note" id="rfc.section.4.1.2.p.19">
     1532      <div class="note" id="rfc.section.4.1.p.18">
    14931533         <p> <b>Note:</b> The "no rewrite" rule prevents the proxy from changing the meaning of the request when the origin server is improperly using
    14941534            a non-reserved URI character for a reserved purpose. Implementors need to be aware that some pre-HTTP/1.1 proxies have been
    14951535            known to rewrite the request-target.
    1496          </p>
    1497       </div>
    1498       <p id="rfc.section.4.1.2.p.20">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 code if the received request-target
    1499          would be longer than the server wishes to handle (see <a href="p2-semantics.html#status.414" title="414 URI Too Long">Section 7.4.15</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>).
    1500       </p>
    1501       <p id="rfc.section.4.1.2.p.21">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.
    1502       </p>
    1503       <div class="note" id="rfc.section.4.1.2.p.22">
    1504          <p> <b>Note:</b> Fragments (<a href="#RFC3986" id="rfc.xref.RFC3986.19"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-3.5">Section 3.5</a>) are not part of the request-target and thus will not be transmitted in an HTTP request.
    15051536         </p>
    15061537      </div>
    … …  
    15511582      </p>
    15521583      <p id="rfc.section.4.3.p.6">Otherwise, when request-target uses the authority form, the effective request URI is undefined.</p>
    1553       <div id="rfc.figure.u.37"></div>
     1584      <div id="rfc.figure.u.40"></div>
    15541585      <p>Example 1: the effective request URI for the message</p>  <pre class="text">GET /pub/WWW/TheProject.html HTTP/1.1
    15551586Host: www.example.org:8080
    … …  
    15571588         the request-target "/pub/WWW/TheProject.html", thus "http://www.example.org:8080/pub/WWW/TheProject.html".
    15581589      </p>
    1559       <div id="rfc.figure.u.38"></div>
     1590      <div id="rfc.figure.u.41"></div>
    15601591      <p>Example 2: the effective request URI for the message</p>  <pre class="text">OPTIONS * HTTP/1.1
    15611592Host: www.example.org
    … …  
    15671598      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="response" href="#response">Response</a></h1>
    15681599      <p id="rfc.section.5.p.1">After receiving and interpreting a request message, a server responds with an HTTP response message.</p>
    1569       <div id="rfc.figure.u.39"></div><pre class="inline"><span id="rfc.iref.g.50"></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;5.1</a>
     1600      <div id="rfc.figure.u.42"></div><pre class="inline"><span id="rfc.iref.g.53"></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;3.1.2</a>
    15701601                  *( <a href="#header.fields" class="smpl">header-field</a> <a href="#core.rules" class="smpl">CRLF</a> )    ; <a href="#header.fields" title="Header Fields">Section&nbsp;3.2</a>
    15711602                  <a href="#core.rules" class="smpl">CRLF</a>
    15721603                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;3.3</a>
    1573 </pre><h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="status-line" href="#status-line">Status-Line</a></h2>
    1574       <p id="rfc.section.5.1.p.1">The first line of a Response message is the Status-Line, consisting of the protocol version, a space (SP), the status code,
    1575          another space, a possibly-empty textual phrase describing the status code, and ending with CRLF.
    1576       </p>
    1577       <div id="rfc.figure.u.40"></div><pre class="inline"><span id="rfc.iref.g.51"></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>
    1578 </pre><h3 id="rfc.section.5.1.1"><a href="#rfc.section.5.1.1">5.1.1</a>&nbsp;<a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h3>
    1579       <p id="rfc.section.5.1.1.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. See <a href="p2-semantics.html#status.code.and.reason.phrase" title="Status Code and Reason Phrase">Section 4</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a> for further information, such as the list of status codes defined by this specification, the IANA registry, and considerations
    1580          for new status codes.
    1581       </p>
    1582       <p id="rfc.section.5.1.1.p.2">The Reason Phrase exists for the sole purpose of providing a textual description associated with the numeric status code,
    1583          out of deference to earlier Internet application protocols that were more frequently used with interactive text clients. A
    1584          client <em class="bcp14">SHOULD</em> ignore the content of the Reason Phrase.
    1585       </p>
    1586       <p id="rfc.section.5.1.1.p.3">The first digit of the Status-Code defines the class of response. The last two digits do not have any categorization role.
    1587          There are 5 values for the first digit:
    1588       </p>
    1589       <ul>
    1590          <li>1xx: Informational - Request received, continuing process</li>
    1591          <li>2xx: Success - The action was successfully received, understood, and accepted</li>
    1592          <li>3xx: Redirection - Further action must be taken in order to complete the request</li>
    1593          <li>4xx: Client Error - The request contains bad syntax or cannot be fulfilled</li>
    1594          <li>5xx: Server Error - The server failed to fulfill an apparently valid request</li>
    1595       </ul>
    1596       <div id="rfc.figure.u.41"></div><pre class="inline"><span id="rfc.iref.g.52"></span><span id="rfc.iref.g.53"></span>  <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a>    = 3<a href="#core.rules" class="smpl">DIGIT</a>
    1597   <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a>  = *( <a href="#core.rules" class="smpl">HTAB</a> / <a href="#core.rules" class="smpl">SP</a> / <a href="#core.rules" class="smpl">VCHAR</a> / <a href="#rule.quoted-string" class="smpl">obs-text</a> )
    15981604</pre><h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
    15991605      <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="date.time.formats.full.date" href="#date.time.formats.full.date">Date/Time Formats: Full Date</a></h2>
    … …  
    16011607         a fixed-length subset of that defined by <a href="#RFC1123" id="rfc.xref.RFC1123.1"><cite title="Requirements for Internet Hosts - Application and Support">[RFC1123]</cite></a>:
    16021608      </p>
    1603       <div id="rfc.figure.u.42"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
     1609      <div id="rfc.figure.u.43"></div><pre class="text">Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 1123
    16041610</pre><p id="rfc.section.6.1.p.3">The other formats are described here only for compatibility with obsolete implementations.</p>
    1605       <div id="rfc.figure.u.43"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
     1611      <div id="rfc.figure.u.44"></div><pre class="text">Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
    16061612Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
    16071613</pre><p id="rfc.section.6.1.p.5">HTTP/1.1 clients and servers that parse a date value <em class="bcp14">MUST</em> accept all three formats (for compatibility with HTTP/1.0), though they <em class="bcp14">MUST</em> only generate the RFC 1123 format for representing HTTP-date values in header fields.
    … …  
    16111617         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.
    16121618      </p>
    1613       <div id="rfc.figure.u.44"></div><pre class="inline"><span id="rfc.iref.g.54"></span>  <a href="#date.time.formats.full.date" class="smpl">HTTP-date</a>    = <a href="#preferred.date.format" class="smpl">rfc1123-date</a> / <a href="#obsolete.date.formats" class="smpl">obs-date</a>
     1619      <div id="rfc.figure.u.45"></div><pre class="inline"><span id="rfc.iref.g.54"></span>  <a href="#date.time.formats.full.date" class="smpl">HTTP-date</a>    = <a href="#preferred.date.format" class="smpl">rfc1123-date</a> / <a href="#obsolete.date.formats" class="smpl">obs-date</a>
    16141620</pre><div id="preferred.date.format">
    16151621         <p id="rfc.section.6.1.p.8">                    Preferred format:</p>
    16161622      </div>
    1617       <div id="rfc.figure.u.45"></div><pre class="inline"><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><span id="rfc.iref.g.62"></span><span id="rfc.iref.g.63"></span><span id="rfc.iref.g.64"></span><span id="rfc.iref.g.65"></span><span id="rfc.iref.g.66"></span>  <a href="#preferred.date.format" class="smpl">rfc1123-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> "," <a href="#core.rules" class="smpl">SP</a> date1 <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
     1623      <div id="rfc.figure.u.46"></div><pre class="inline"><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><span id="rfc.iref.g.62"></span><span id="rfc.iref.g.63"></span><span id="rfc.iref.g.64"></span><span id="rfc.iref.g.65"></span><span id="rfc.iref.g.66"></span>  <a href="#preferred.date.format" class="smpl">rfc1123-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> "," <a href="#core.rules" class="smpl">SP</a> date1 <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
    16181624  ; fixed length subset of the format defined in
    16191625  ; <a href="http://tools.ietf.org/html/rfc1123#section-5.2.14">Section 5.2.14</a> of <a href="#RFC1123" id="rfc.xref.RFC1123.2"><cite title="Requirements for Internet Hosts - Application and Support">[RFC1123]</cite></a>
    … …  
    16581664         <p id="rfc.section.6.1.p.11">                Obsolete formats:</p>
    16591665      </div>
    1660       <div id="rfc.figure.u.46"></div><pre class="inline"><span id="rfc.iref.g.67"></span>  <a href="#obsolete.date.formats" class="smpl">obs-date</a>     = <a href="#obsolete.date.formats" class="smpl">rfc850-date</a> / <a href="#obsolete.date.formats" class="smpl">asctime-date</a>
    1661 </pre><div id="rfc.figure.u.47"></div><pre class="inline"><span id="rfc.iref.g.68"></span>  <a href="#obsolete.date.formats" class="smpl">rfc850-date</a>  = <a href="#obsolete.date.formats" class="smpl">day-name-l</a> "," <a href="#core.rules" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date2</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
     1666      <div id="rfc.figure.u.47"></div><pre class="inline"><span id="rfc.iref.g.67"></span>  <a href="#obsolete.date.formats" class="smpl">obs-date</a>     = <a href="#obsolete.date.formats" class="smpl">rfc850-date</a> / <a href="#obsolete.date.formats" class="smpl">asctime-date</a>
     1667</pre><div id="rfc.figure.u.48"></div><pre class="inline"><span id="rfc.iref.g.68"></span>  <a href="#obsolete.date.formats" class="smpl">rfc850-date</a>  = <a href="#obsolete.date.formats" class="smpl">day-name-l</a> "," <a href="#core.rules" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date2</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">GMT</a>
    16621668  <a href="#obsolete.date.formats" class="smpl">date2</a>        = <a href="#preferred.date.format" class="smpl">day</a> "-" <a href="#preferred.date.format" class="smpl">month</a> "-" 2<a href="#core.rules" class="smpl">DIGIT</a>
    16631669                 ; day-month-year (e.g., 02-Jun-82)
    … …  
    16701676         / %x53.61.74.75.72.64.61.79 ; "Saturday", case-sensitive
    16711677         / %x53.75.6E.64.61.79 ; "Sunday", case-sensitive
    1672 </pre><div id="rfc.figure.u.48"></div><pre class="inline"><span id="rfc.iref.g.69"></span>  <a href="#obsolete.date.formats" class="smpl">asctime-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> <a href="#core.rules" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date3</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">year</a>
     1678</pre><div id="rfc.figure.u.49"></div><pre class="inline"><span id="rfc.iref.g.69"></span>  <a href="#obsolete.date.formats" class="smpl">asctime-date</a> = <a href="#preferred.date.format" class="smpl">day-name</a> <a href="#core.rules" class="smpl">SP</a> <a href="#obsolete.date.formats" class="smpl">date3</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">time-of-day</a> <a href="#core.rules" class="smpl">SP</a> <a href="#preferred.date.format" class="smpl">year</a>
    16731679  <a href="#obsolete.date.formats" class="smpl">date3</a>        = <a href="#preferred.date.format" class="smpl">month</a> <a href="#core.rules" class="smpl">SP</a> ( 2<a href="#core.rules" class="smpl">DIGIT</a> / ( <a href="#core.rules" class="smpl">SP</a> 1<a href="#core.rules" class="smpl">DIGIT</a> ))
    16741680                 ; month day (e.g., Jun  2)
    … …  
    16881694         transfer-coding is a property of the message rather than a property of the representation that is being transferred.
    16891695      </p>
    1690       <div id="rfc.figure.u.49"></div><pre class="inline"><span id="rfc.iref.g.70"></span><span id="rfc.iref.g.71"></span>  <a href="#transfer.codings" class="smpl">transfer-coding</a>         = "chunked" ; <a href="#chunked.encoding" title="Chunked Transfer Coding">Section&nbsp;6.2.1</a>
     1696      <div id="rfc.figure.u.50"></div><pre class="inline"><span id="rfc.iref.g.70"></span><span id="rfc.iref.g.71"></span>  <a href="#transfer.codings" class="smpl">transfer-coding</a>         = "chunked" ; <a href="#chunked.encoding" title="Chunked Transfer Coding">Section&nbsp;6.2.1</a>
    16911697                          / "compress" ; <a href="#compress.coding" title="Compress Coding">Section&nbsp;6.2.2.1</a>
    16921698                          / "deflate" ; <a href="#deflate.coding" title="Deflate Coding">Section&nbsp;6.2.2.2</a>
    … …  
    16971703         <p id="rfc.section.6.2.p.3">      Parameters are in the form of attribute/value pairs.</p>
    16981704      </div>
    1699       <div id="rfc.figure.u.50"></div><pre class="inline"><span id="rfc.iref.g.72"></span><span id="rfc.iref.g.73"></span><span id="rfc.iref.g.74"></span><span id="rfc.iref.g.75"></span><span id="rfc.iref.g.76"></span>  <a href="#rule.parameter" class="smpl">transfer-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>
     1705      <div id="rfc.figure.u.51"></div><pre class="inline"><span id="rfc.iref.g.72"></span><span id="rfc.iref.g.73"></span><span id="rfc.iref.g.74"></span><span id="rfc.iref.g.75"></span><span id="rfc.iref.g.76"></span>  <a href="#rule.parameter" class="smpl">transfer-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>
    17001706  <a href="#rule.parameter" class="smpl">attribute</a>               = <a href="#rule.token.separators" class="smpl">token</a>
    17011707  <a href="#rule.parameter" class="smpl">value</a>                   = <a href="#rule.token.separators" class="smpl">word</a>
    … …  
    17151721         for the recipient to verify that it has received the full message.
    17161722      </p>
    1717       <div id="rfc.figure.u.51"></div><pre class="inline"><span id="rfc.iref.g.77"></span><span id="rfc.iref.g.78"></span><span id="rfc.iref.g.79"></span><span id="rfc.iref.g.80"></span><span id="rfc.iref.g.81"></span><span id="rfc.iref.g.82"></span><span id="rfc.iref.g.83"></span><span id="rfc.iref.g.84"></span><span id="rfc.iref.g.85"></span><span id="rfc.iref.g.86"></span><span id="rfc.iref.g.87"></span>  <a href="#chunked.encoding" class="smpl">Chunked-Body</a>   = *<a href="#chunked.encoding" class="smpl">chunk</a>
     1723      <div id="rfc.figure.u.52"></div><pre class="inline"><span id="rfc.iref.g.77"></span><span id="rfc.iref.g.78"></span><span id="rfc.iref.g.79"></span><span id="rfc.iref.g.80"></span><span id="rfc.iref.g.81"></span><span id="rfc.iref.g.82"></span><span id="rfc.iref.g.83"></span><span id="rfc.iref.g.84"></span><span id="rfc.iref.g.85"></span><span id="rfc.iref.g.86"></span><span id="rfc.iref.g.87"></span>  <a href="#chunked.encoding" class="smpl">Chunked-Body</a>   = *<a href="#chunked.encoding" class="smpl">chunk</a>
    17181724                   <a href="#chunked.encoding" class="smpl">last-chunk</a>
    17191725                   <a href="#chunked.encoding" class="smpl">trailer-part</a>
    … …  
    17581764      </p>
    17591765      <p id="rfc.section.6.2.1.p.7">A process for decoding the "chunked" transfer-coding can be represented in pseudo-code as:</p>
    1760       <div id="rfc.figure.u.52"></div><pre class="text">  length := 0
     1766      <div id="rfc.figure.u.53"></div><pre class="text">  length := 0
    17611767  read chunk-size, chunk-ext (if any) and CRLF
    17621768  while (chunk-size &gt; 0) {
    … …  
    18301836         By convention, the products are listed in order of their significance for identifying the application.
    18311837      </p>
    1832       <div id="rfc.figure.u.53"></div><pre class="inline"><span id="rfc.iref.g.89"></span><span id="rfc.iref.g.90"></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>]
     1838      <div id="rfc.figure.u.54"></div><pre class="inline"><span id="rfc.iref.g.89"></span><span id="rfc.iref.g.90"></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>]
    18331839  <a href="#product.tokens" class="smpl">product-version</a> = <a href="#rule.token.separators" class="smpl">token</a>
    18341840</pre><p id="rfc.section.6.3.p.3">Examples:</p>
    1835       <div id="rfc.figure.u.54"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     1841      <div id="rfc.figure.u.55"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    18361842  Server: Apache/0.8.4
    18371843</pre><p id="rfc.section.6.3.p.5">Product tokens <em class="bcp14">SHOULD</em> be short and to the point. They <em class="bcp14">MUST NOT</em> be used for advertising or other non-essential information. Although any token octet <em class="bcp14">MAY</em> appear in a product-version, this token <em class="bcp14">SHOULD</em> only be used for a version identifier (i.e., successive versions of the same product <em class="bcp14">SHOULD</em> only differ in the product-version portion of the product value).
    … …  
    18421848         a quality value of 0, then content with this parameter is "not acceptable" for the client. HTTP/1.1 applications <em class="bcp14">MUST NOT</em> generate more than three digits after the decimal point. User configuration of these values <em class="bcp14">SHOULD</em> also be limited in this fashion.
    18431849      </p>
    1844       <div id="rfc.figure.u.55"></div><pre class="inline"><span id="rfc.iref.g.91"></span>  <a href="#quality.values" class="smpl">qvalue</a>         = ( "0" [ "." 0*3<a href="#core.rules" class="smpl">DIGIT</a> ] )
     1850      <div id="rfc.figure.u.56"></div><pre class="inline"><span id="rfc.iref.g.91"></span>  <a href="#quality.values" class="smpl">qvalue</a>         = ( "0" [ "." 0*3<a href="#core.rules" class="smpl">DIGIT</a> ] )
    18451851                 / ( "1" [ "." 0*3("0") ] )
    18461852</pre><div class="note" id="rfc.section.6.4.p.3">
    … …  
    21732179      </p>
    21742180      <p id="rfc.section.9.1.p.2">The Connection header field's value has the following grammar:</p>
    2175       <div id="rfc.figure.u.56"></div><pre class="inline"><span id="rfc.iref.g.92"></span><span id="rfc.iref.g.93"></span>  <a href="#header.connection" class="smpl">Connection</a>       = 1#<a href="#header.connection" class="smpl">connection-token</a>
     2181      <div id="rfc.figure.u.57"></div><pre class="inline"><span id="rfc.iref.g.92"></span><span id="rfc.iref.g.93"></span>  <a href="#header.connection" class="smpl">Connection</a>       = 1#<a href="#header.connection" class="smpl">connection-token</a>
    21762182  <a href="#header.connection" class="smpl">connection-token</a> = <a href="#rule.token.separators" class="smpl">token</a>
    21772183</pre><p id="rfc.section.9.1.p.4">A proxy or gateway <em class="bcp14">MUST</em> parse a received Connection header field before a message is forwarded and, for each connection-token in this field, remove
    … …  
    21962202         of the response. For example,
    21972203      </p>
    2198       <div id="rfc.figure.u.57"></div><pre class="text">  Connection: close
     2204      <div id="rfc.figure.u.58"></div><pre class="text">  Connection: close
    21992205</pre><p id="rfc.section.9.1.p.10">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.
    22002206      </p>
    … …  
    22122218         body (not including any potential transfer-coding) that would have been sent in a 200 (OK) response.
    22132219      </p>
    2214       <div id="rfc.figure.u.58"></div><pre class="inline"><span id="rfc.iref.g.94"></span>  <a href="#header.content-length" class="smpl">Content-Length</a> = 1*<a href="#core.rules" class="smpl">DIGIT</a>
     2220      <div id="rfc.figure.u.59"></div><pre class="inline"><span id="rfc.iref.g.94"></span>  <a href="#header.content-length" class="smpl">Content-Length</a> = 1*<a href="#core.rules" class="smpl">DIGIT</a>
    22152221</pre><p id="rfc.section.9.2.p.3">An example is</p>
    2216       <div id="rfc.figure.u.59"></div><pre class="text">  Content-Length: 3495
     2222      <div id="rfc.figure.u.60"></div><pre class="text">  Content-Length: 3495
    22172223</pre><p id="rfc.section.9.2.p.5">Implementations <em class="bcp14">SHOULD</em> use this field to indicate the message-body length when no transfer-coding is being applied and the payload's body length
    22182224         can be determined prior to being transferred. <a href="#message.body" title="Message Body">Section&nbsp;3.3</a> describes how recipients determine the length of a message-body.
    … …  
    22282234         Origination Date Field (orig-date) defined in <a href="http://tools.ietf.org/html/rfc5322#section-3.6.1">Section 3.6.1</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.4"><cite title="Internet Message Format">[RFC5322]</cite></a>. The field value is an HTTP-date, as described in <a href="#date.time.formats.full.date" title="Date/Time Formats: Full Date">Section&nbsp;6.1</a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.
    22292235      </p>
    2230       <div id="rfc.figure.u.60"></div><pre class="inline"><span id="rfc.iref.g.95"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#date.time.formats.full.date" class="smpl">HTTP-date</a>
     2236      <div id="rfc.figure.u.61"></div><pre class="inline"><span id="rfc.iref.g.95"></span>  <a href="#header.date" class="smpl">Date</a> = <a href="#date.time.formats.full.date" class="smpl">HTTP-date</a>
    22312237</pre><p id="rfc.section.9.3.p.3">An example is</p>
    2232       <div id="rfc.figure.u.61"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
     2238      <div id="rfc.figure.u.62"></div><pre class="text">  Date: Tue, 15 Nov 1994 08:12:31 GMT
    22332239</pre><p id="rfc.section.9.3.p.5">Origin servers <em class="bcp14">MUST</em> include a Date header field in all responses, except in these cases:
    22342240      </p>
    … …  
    22642270         Host field-value is critical information for handling a request, it <em class="bcp14">SHOULD</em> be sent as the first header field following the Request-Line.
    22652271      </p>
    2266       <div id="rfc.figure.u.62"></div><pre class="inline"><span id="rfc.iref.g.96"></span>  <a href="#header.host" class="smpl">Host</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;2.7.1</a>
     2272      <div id="rfc.figure.u.63"></div><pre class="inline"><span id="rfc.iref.g.96"></span>  <a href="#header.host" class="smpl">Host</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;2.7.1</a>
    22672273</pre><p id="rfc.section.9.4.p.3">A client <em class="bcp14">MUST</em> send a Host header field in all HTTP/1.1 request messages. If the target resource's URI includes an authority component, then
    22682274         the Host field-value <em class="bcp14">MUST</em> be identical to that authority component after excluding any userinfo (<a href="#http.uri" title="http URI scheme">Section&nbsp;2.7.1</a>). If the authority component is missing or undefined for the target resource's URI, then the Host header field <em class="bcp14">MUST</em> be sent with an empty field-value.
    22692275      </p>
    22702276      <p id="rfc.section.9.4.p.4">For example, a GET request to the origin server for &lt;http://www.example.org/pub/WWW/&gt; would begin with:</p>
    2271       <div id="rfc.figure.u.63"></div><pre class="text2">GET /pub/WWW/ HTTP/1.1
     2277      <div id="rfc.figure.u.64"></div><pre class="text2">GET /pub/WWW/ HTTP/1.1
    22722278Host: www.example.org
    22732279</pre><p id="rfc.section.9.4.p.6">The Host header field <em class="bcp14">MUST</em> be sent in an HTTP/1.1 request even if the request-target is in the form of an absolute-URI, since this allows the Host information
    … …  
    22962302         accept parameters (as described in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;6.2</a>).
    22972303      </p>
    2298       <div id="rfc.figure.u.64"></div><pre class="inline"><span id="rfc.iref.g.97"></span><span id="rfc.iref.g.98"></span><span id="rfc.iref.g.99"></span><span id="rfc.iref.g.100"></span>  <a href="#header.te" class="smpl">TE</a>        = #<a href="#header.te" class="smpl">t-codings</a>
     2304      <div id="rfc.figure.u.65"></div><pre class="inline"><span id="rfc.iref.g.97"></span><span id="rfc.iref.g.98"></span><span id="rfc.iref.g.99"></span><span id="rfc.iref.g.100"></span>  <a href="#header.te" class="smpl">TE</a>        = #<a href="#header.te" class="smpl">t-codings</a>
    22992305  <a href="#header.te" class="smpl">t-codings</a> = "trailers" / ( <a href="#transfer.codings" class="smpl">transfer-extension</a> [ <a href="#header.te" class="smpl">te-params</a> ] )
    23002306  <a href="#header.te" class="smpl">te-params</a> = <a href="#rule.whitespace" class="smpl">OWS</a> ";" <a href="#rule.whitespace" class="smpl">OWS</a> "q=" <a href="#quality.values" class="smpl">qvalue</a> *( <a href="#header.te" class="smpl">te-ext</a> )
    … …  
    23042310      </p>
    23052311      <p id="rfc.section.9.5.p.5">Examples of its use are:</p>
    2306       <div id="rfc.figure.u.65"></div><pre class="text">  TE: deflate
     2312      <div id="rfc.figure.u.66"></div><pre class="text">  TE: deflate
    23072313  TE:
    23082314  TE: trailers, deflate;q=0.5
    … …  
    23412347         chunked transfer-coding.
    23422348      </p>
    2343       <div id="rfc.figure.u.66"></div><pre class="inline"><span id="rfc.iref.g.101"></span>  <a href="#header.trailer" class="smpl">Trailer</a> = 1#<a href="#header.fields" class="smpl">field-name</a>
     2349      <div id="rfc.figure.u.67"></div><pre class="inline"><span id="rfc.iref.g.101"></span>  <a href="#header.trailer" class="smpl">Trailer</a> = 1#<a href="#header.fields" class="smpl">field-name</a>
    23442350</pre><p id="rfc.section.9.6.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
    23452351         to know which header fields to expect in the trailer.
    … …  
    23612367         are not.
    23622368      </p>
    2363       <div id="rfc.figure.u.67"></div><pre class="inline"><span id="rfc.iref.g.102"></span>  <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a> = 1#<a href="#transfer.codings" class="smpl">transfer-coding</a>
     2369      <div id="rfc.figure.u.68"></div><pre class="inline"><span id="rfc.iref.g.102"></span>  <a href="#header.transfer-encoding" class="smpl">Transfer-Encoding</a> = 1#<a href="#transfer.codings" class="smpl">transfer-coding</a>
    23642370</pre><p id="rfc.section.9.7.p.3">Transfer-codings are defined in <a href="#transfer.codings" title="Transfer Codings">Section&nbsp;6.2</a>. An example is:
    23652371      </p>
    2366       <div id="rfc.figure.u.68"></div><pre class="text">  Transfer-Encoding: chunked
     2372      <div id="rfc.figure.u.69"></div><pre class="text">  Transfer-Encoding: chunked
    23672373</pre><p id="rfc.section.9.7.p.5">If multiple encodings have been applied to a representation, 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 header fields not defined by this specification.
    23682374      </p>
    … …  
    23742380         server chooses to switch protocols. Servers can use it to indicate what protocols they are willing to switch to.
    23752381      </p>
    2376       <div id="rfc.figure.u.69"></div><pre class="inline"><span id="rfc.iref.g.103"></span>  <a href="#header.upgrade" class="smpl">Upgrade</a> = 1#<a href="#product.tokens" class="smpl">product</a>
     2382      <div id="rfc.figure.u.70"></div><pre class="inline"><span id="rfc.iref.g.103"></span>  <a href="#header.upgrade" class="smpl">Upgrade</a> = 1#<a href="#product.tokens" class="smpl">product</a>
    23772383</pre><p id="rfc.section.9.8.p.3">For example,</p>
    2378       <div id="rfc.figure.u.70"></div><pre class="text">  Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
     2384      <div id="rfc.figure.u.71"></div><pre class="text">  Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
    23792385</pre><p id="rfc.section.9.8.p.5">The Upgrade header field is intended to provide a simple mechanism for transition from HTTP/1.1 to some other, incompatible
    23802386         protocol. It does so by allowing the client to advertise its desire to use another protocol, such as a later version of HTTP
    … …  
    24312437         of all senders along the request/response chain.
    24322438      </p>
    2433       <div id="rfc.figure.u.71"></div><pre class="inline"><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><span id="rfc.iref.g.108"></span><span id="rfc.iref.g.109"></span>  <a href="#header.via" class="smpl">Via</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>
     2439      <div id="rfc.figure.u.72"></div><pre class="inline"><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><span id="rfc.iref.g.108"></span><span id="rfc.iref.g.109"></span>  <a href="#header.via" class="smpl">Via</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>
    24342440                          [ <a href="#rule.whitespace" class="smpl">RWS</a> <a href="#rule.comment" class="smpl">comment</a> ] )
    24352441  <a href="#header.via" class="smpl">received-protocol</a> = [ <a href="#header.via" class="smpl">protocol-name</a> "/" ] <a href="#header.via" class="smpl">protocol-version</a>
    … …  
    24552461         server at www.example.com. The request received by www.example.com would then have the following Via header field:
    24562462      </p>
    2457       <div id="rfc.figure.u.72"></div><pre class="text">  Via: 1.0 fred, 1.1 p.example.net (Apache/1.1)
     2463      <div id="rfc.figure.u.73"></div><pre class="text">  Via: 1.0 fred, 1.1 p.example.net (Apache/1.1)
    24582464</pre><p id="rfc.section.9.9.p.9">A proxy or gateway used as a portal through a network firewall <em class="bcp14">SHOULD NOT</em> forward the names and ports of hosts within the firewall region unless it is explicitly enabled to do so. If not enabled,
    24592465         the received-by host of any host behind the firewall <em class="bcp14">SHOULD</em> be replaced by an appropriate pseudonym for that host.
    … …  
    24622468         For example,
    24632469      </p>
    2464       <div id="rfc.figure.u.73"></div><pre class="text">  Via: 1.0 ricky, 1.1 ethel, 1.1 fred, 1.0 lucy
     2470      <div id="rfc.figure.u.74"></div><pre class="text">  Via: 1.0 ricky, 1.1 ethel, 1.1 fred, 1.0 lucy
    24652471</pre><p id="rfc.section.9.9.p.12">could be collapsed to</p>
    2466       <div id="rfc.figure.u.74"></div><pre class="text">  Via: 1.0 ricky, 1.1 mertz, 1.0 lucy
     2472      <div id="rfc.figure.u.75"></div><pre class="text">  Via: 1.0 ricky, 1.1 mertz, 1.0 lucy
    24672473</pre><p id="rfc.section.9.9.p.14">Senders <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
    24682474         by pseudonyms. Senders <em class="bcp14">MUST NOT</em> combine entries which have different received-protocol values.
    … …  
    28172823         a Denial of Service against implementations that accept fields with unlimited lengths.
    28182824      </p>
    2819       <p id="rfc.section.11.6.p.2">To promote interoperability, this specification makes specific recommendations for size limits on request-targets (<a href="#request-target" title="request-target">Section&nbsp;4.1.2</a>) and blocks of header fields (<a href="#header.fields" title="Header Fields">Section&nbsp;3.2</a>). These are minimum recommendations, chosen to be supportable even by implementations with limited resources; it is expected
     2825      <p id="rfc.section.11.6.p.2">To promote interoperability, this specification makes specific recommendations for size limits on request-targets (<a href="#request-target" title="request-target">Section&nbsp;3.1.1.2</a>) and blocks of header fields (<a href="#header.fields" title="Header Fields">Section&nbsp;3.2</a>). These are minimum recommendations, chosen to be supportable even by implementations with limited resources; it is expected
    28202826         that most implementations will choose substantially higher limits.
    28212827      </p>
    … …  
    30743080      <p id="rfc.section.A.1.p.1">This section summarizes major differences between versions HTTP/1.0 and HTTP/1.1.</p>
    30753081      <h3 id="rfc.section.A.1.1"><a href="#rfc.section.A.1.1">A.1.1</a>&nbsp;<a id="changes.to.simplify.multi-homed.web.servers.and.conserve.ip.addresses" href="#changes.to.simplify.multi-homed.web.servers.and.conserve.ip.addresses">Multi-homed Web Servers</a></h3>
    3076       <p id="rfc.section.A.1.1.p.1">The requirements that clients and servers support the Host header field (<a href="#header.host" id="rfc.xref.header.host.4" title="Host">Section&nbsp;9.4</a>), report an error if it is missing from an HTTP/1.1 request, and accept absolute URIs (<a href="#request-target" title="request-target">Section&nbsp;4.1.2</a>) are among the most important changes defined by HTTP/1.1.
     3082      <p id="rfc.section.A.1.1.p.1">The requirements that clients and servers support the Host header field (<a href="#header.host" id="rfc.xref.header.host.4" title="Host">Section&nbsp;9.4</a>), report an error if it is missing from an HTTP/1.1 request, and accept absolute URIs (<a href="#request-target" title="request-target">Section&nbsp;3.1.1.2</a>) are among the most important changes defined by HTTP/1.1.
    30773083      </p>
    30783084      <p id="rfc.section.A.1.1.p.2">Older HTTP/1.0 clients assumed a one-to-one relationship of IP addresses and servers; there was no other established mechanism
    … …  
    31203126      </p>
    31213127      <p id="rfc.section.A.2.p.8">Update use of abs_path production from RFC 1808 to the path-absolute + query components of RFC 3986. State that the asterisk
    3122          form is allowed for the OPTIONS request method only. (<a href="#request-target" title="request-target">Section&nbsp;4.1.2</a>)
     3128         form is allowed for the OPTIONS request method only. (<a href="#request-target" title="request-target">Section&nbsp;3.1.1.2</a>)
    31233129      </p>
    31243130      <p id="rfc.section.A.2.p.9">Clarification that the chunk length does not include the count of the octets in the chunk header and trailer. Furthermore
    … …  
    31343140      </p>
    31353141      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    3136       <div id="rfc.figure.u.75"></div> <pre class="inline"><a href="#rule.whitespace" class="smpl">BWS</a> = OWS
     3142      <div id="rfc.figure.u.76"></div> <pre class="inline"><a href="#rule.whitespace" class="smpl">BWS</a> = OWS
    31373143
    31383144<a href="#chunked.encoding" class="smpl">Chunked-Body</a> = *chunk last-chunk trailer-part CRLF
    … …  
    31573163
    31583164<a href="#rule.whitespace" class="smpl">RWS</a> = 1*( SP / HTAB / obs-fold )
    3159 <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> = *( HTAB / SP / VCHAR / obs-text )
     3165<a href="#reason.phrase" class="smpl">Reason-Phrase</a> = *( HTAB / SP / VCHAR / obs-text )
    31603166<a href="#request" class="smpl">Request</a> = Request-Line *( header-field CRLF ) CRLF [ message-body ]
    31613167<a href="#request-line" class="smpl">Request-Line</a> = Method SP request-target SP HTTP-Version CRLF
    31623168<a href="#response" class="smpl">Response</a> = Status-Line *( header-field CRLF ) CRLF [ message-body ]
    31633169
    3164 <a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a> = 3DIGIT
     3170<a href="#status.code" class="smpl">Status-Code</a> = 3DIGIT
    31653171<a href="#status-line" class="smpl">Status-Line</a> = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
    31663172
    … …  
    33003306
    33013307<a href="#preferred.date.format" class="smpl">year</a> = 4DIGIT
    3302 </pre> <div id="rfc.figure.u.76"></div>
     3308</pre> <div id="rfc.figure.u.77"></div>
    33033309      <p>ABNF diagnostics:</p><pre class="inline">; Chunked-Body defined but not used
    33043310; Connection defined but not used
    … …  
    36773683         <ul class="ind">
    36783684            <li><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul>
    3679                   <li>absolute-URI form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.3">4.1.2</a></li>
     3685                  <li>absolute-URI form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.3">4.1</a></li>
    36803686                  <li>accelerator&nbsp;&nbsp;<a href="#rfc.iref.a.1"><b>2.4</b></a></li>
    36813687                  <li>application/http Media Type&nbsp;&nbsp;<a href="#rfc.iref.a.5"><b>10.3.2</b></a></li>
    3682                   <li>asterisk form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.2">4.1.2</a></li>
    3683                   <li>authority form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.4">4.1.2</a></li>
     3688                  <li>asterisk form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.2">4.1</a></li>
     3689                  <li>authority form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.a.4">4.1</a></li>
    36843690               </ul>
    36853691            </li>
    … …  
    37363742                        <li><tt>chunk-size</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.79"><b>6.2.1</b></a></li>
    37373743                        <li><tt>Chunked-Body</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.77"><b>6.2.1</b></a></li>
    3738                         <li><tt>comment</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.42"><b>3.2.3</b></a></li>
     3744                        <li><tt>comment</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.48"><b>3.2.3</b></a></li>
    37393745                        <li><tt>Connection</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.92"><b>9.1</b></a></li>
    37403746                        <li><tt>connection-token</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.93"><b>9.1</b></a></li>
    … …  
    37423748                        <li>CR&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>1.2</b></a></li>
    37433749                        <li>CRLF&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>1.2</b></a></li>
    3744                         <li><tt>ctext</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.43"><b>3.2.3</b></a></li>
     3750                        <li><tt>ctext</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.49"><b>3.2.3</b></a></li>
    37453751                        <li>CTL&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>1.2</b></a></li>
    37463752                        <li><tt>Date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.95"><b>9.3</b></a></li>
    … …  
    37533759                        <li>DIGIT&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>1.2</b></a></li>
    37543760                        <li>DQUOTE&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>1.2</b></a></li>
    3755                         <li><tt>field-content</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>3.2</b></a></li>
    3756                         <li><tt>field-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>3.2</b></a></li>
    3757                         <li><tt>field-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>3.2</b></a></li>
     3761                        <li><tt>field-content</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.39"><b>3.2</b></a></li>
     3762                        <li><tt>field-name</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.37"><b>3.2</b></a></li>
     3763                        <li><tt>field-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.38"><b>3.2</b></a></li>
    37583764                        <li><tt>GMT</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.66"><b>6.1</b></a></li>
    3759                         <li><tt>header-field</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>3.2</b></a></li>
     3765                        <li><tt>header-field</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.36"><b>3.2</b></a></li>
    37603766                        <li>HEXDIG&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>1.2</b></a></li>
    37613767                        <li><tt>Host</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.96"><b>9.4</b></a></li>
    … …  
    37703776                        <li><tt>last-chunk</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.80"><b>6.2.1</b></a></li>
    37713777                        <li>LF&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>1.2</b></a></li>
    3772                         <li><tt>message-body</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.45"><b>3.3</b></a></li>
    3773                         <li><tt>Method</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.48"><b>4.1.1</b></a></li>
     3778                        <li><tt>message-body</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.51"><b>3.3</b></a></li>
     3779                        <li><tt>Method</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.31"><b>3.1.1.1</b></a></li>
    37743780                        <li><tt>minute</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.59"><b>6.1</b></a></li>
    37753781                        <li><tt>month</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.64"><b>6.1</b></a></li>
    37763782                        <li><tt>obs-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.67"><b>6.1</b></a></li>
    3777                         <li><tt>obs-text</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.40"><b>3.2.3</b></a></li>
     3783                        <li><tt>obs-text</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.46"><b>3.2.3</b></a></li>
    37783784                        <li>OCTET&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>1.2</b></a></li>
    37793785                        <li><tt>OWS</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>1.2.2</b></a></li>
    … …  
    37853791                        <li><tt>protocol-version</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.107"><b>9.9</b></a></li>
    37863792                        <li><tt>pseudonym</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.109"><b>9.9</b></a></li>
    3787                         <li><tt>qdtext</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.39"><b>3.2.3</b></a></li>
     3793                        <li><tt>qdtext</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.45"><b>3.2.3</b></a></li>
    37883794                        <li><tt>qdtext-nf</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.87"><b>6.2.1</b></a></li>
    37893795                        <li><tt>query</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>2.7</b></a></li>
    3790                         <li><tt>quoted-cpair</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.44"><b>3.2.3</b></a></li>
    3791                         <li><tt>quoted-pair</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.41"><b>3.2.3</b></a></li>
     3796                        <li><tt>quoted-cpair</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.50"><b>3.2.3</b></a></li>
     3797                        <li><tt>quoted-pair</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.47"><b>3.2.3</b></a></li>
    37923798                        <li><tt>quoted-str-nf</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.86"><b>6.2.1</b></a></li>
    3793                         <li><tt>quoted-string</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.38"><b>3.2.3</b></a></li>
     3799                        <li><tt>quoted-string</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.44"><b>3.2.3</b></a></li>
    37943800                        <li><tt>qvalue</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.91"><b>6.4</b></a></li>
    3795                         <li><tt>Reason-Phrase</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.53"><b>5.1.1</b></a></li>
     3801                        <li><tt>Reason-Phrase</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>3.1.2.2</b></a></li>
    37963802                        <li><tt>received-by</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.108"><b>9.9</b></a></li>
    37973803                        <li><tt>received-protocol</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.105"><b>9.9</b></a></li>
    3798                         <li><tt>Request</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.46"><b>4</b></a></li>
    3799                         <li><tt>Request-Line</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.47"><b>4.1</b></a></li>
    3800                         <li><tt>request-target</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.49"><b>4.1.2</b></a></li>
    3801                         <li><tt>Response</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.50"><b>5</b></a></li>
     3804                        <li><tt>Request</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.52"><b>4</b></a></li>
     3805                        <li><tt>Request-Line</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.30"><b>3.1.1</b></a></li>
     3806                        <li><tt>request-target</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.32"><b>3.1.1.2</b></a></li>
     3807                        <li><tt>Response</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.53"><b>5</b></a></li>
    38023808                        <li><tt>rfc1123-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.55"><b>6.1</b></a></li>
    38033809                        <li><tt>rfc850-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.68"><b>6.1</b></a></li>
    … …  
    38053811                        <li><tt>second</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.60"><b>6.1</b></a></li>
    38063812                        <li>SP&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>1.2</b></a></li>
    3807                         <li><tt>special</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.37"><b>3.2.3</b></a></li>
     3813                        <li><tt>special</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.43"><b>3.2.3</b></a></li>
    38083814                        <li><tt>start-line</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.29"><b>3.1</b></a></li>
    3809                         <li><tt>Status-Code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.52"><b>5.1.1</b></a></li>
    3810                         <li><tt>Status-Line</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.51"><b>5.1</b></a></li>
     3815                        <li><tt>Status-Code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>3.1.2.1</b></a></li>
     3816                        <li><tt>Status-Line</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.33"><b>3.1.2</b></a></li>
    38113817                        <li><tt>t-codings</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.98"><b>9.5</b></a></li>
    3812                         <li><tt>tchar</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.36"><b>3.2.3</b></a></li>
     3818                        <li><tt>tchar</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.42"><b>3.2.3</b></a></li>
    38133819                        <li><tt>TE</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.97"><b>9.5</b></a></li>
    38143820                        <li><tt>te-ext</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.100"><b>9.5</b></a></li>
    38153821                        <li><tt>te-params</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.99"><b>9.5</b></a></li>
    38163822                        <li><tt>time-of-day</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.57"><b>6.1</b></a></li>
    3817                         <li><tt>token</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.35"><b>3.2.3</b></a></li>
     3823                        <li><tt>token</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.41"><b>3.2.3</b></a></li>
    38183824                        <li><tt>Trailer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.101"><b>9.6</b></a></li>
    38193825                        <li><tt>trailer-part</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.85"><b>6.2.1</b></a></li>
    … …  
    38283834                        <li>VCHAR&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>1.2</b></a></li>
    38293835                        <li><tt>Via</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.104"><b>9.9</b></a></li>
    3830                         <li><tt>word</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.34"><b>3.2.3</b></a></li>
     3836                        <li><tt>word</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.40"><b>3.2.3</b></a></li>
    38313837                        <li><tt>year</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.65"><b>6.1</b></a></li>
    38323838                     </ul>
    … …  
    38853891            </li>
    38863892            <li><a id="rfc.index.O" href="#rfc.index.O"><b>O</b></a><ul>
    3887                   <li>origin form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.o.3">4.1.2</a></li>
     3893                  <li>origin form (of request-target)&nbsp;&nbsp;<a href="#rfc.iref.o.3">4.1</a></li>
    38883894                  <li>origin server&nbsp;&nbsp;<a href="#rfc.iref.o.1"><b>2.1</b></a></li>
    38893895                  <li>outbound&nbsp;&nbsp;<a href="#rfc.iref.o.2"><b>2.4</b></a></li>
    … …  
    38923898            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
    38933899                  <li><em>Pad1995</em>&nbsp;&nbsp;<a href="#rfc.xref.Pad1995.1">7.1.1</a>, <a href="#Pad1995"><b>13.2</b></a></li>
    3894                   <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">2.4</a>, <a href="#rfc.xref.Part2.2">3.2</a>, <a href="#rfc.xref.Part2.3">4.1.1</a>, <a href="#rfc.xref.Part2.4">4.1.2</a>, <a href="#rfc.xref.Part2.5">4.1.2</a>, <a href="#rfc.xref.Part2.6">5.1.1</a>, <a href="#rfc.xref.Part2.7">7.1.2.2</a>, <a href="#rfc.xref.Part2.8">7.1.4</a>, <a href="#rfc.xref.Part2.9">7.2.3</a>, <a href="#rfc.xref.Part2.10">7.2.3</a>, <a href="#rfc.xref.Part2.11">7.2.3</a>, <a href="#rfc.xref.Part2.12">7.2.3</a>, <a href="#rfc.xref.Part2.13">9.8</a>, <a href="#rfc.xref.Part2.14">11.6</a>, <a href="#rfc.xref.Part2.15">11.6</a>, <a href="#Part2"><b>13.1</b></a><ul>
    3895                         <li><em>Section 2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.3">4.1.1</a></li>
    3896                         <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.2">3.2</a></li>
    3897                         <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.6">5.1.1</a></li>
     3900                  <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">2.4</a>, <a href="#rfc.xref.Part2.2">3.1.1.1</a>, <a href="#rfc.xref.Part2.3">3.1.1.2</a>, <a href="#rfc.xref.Part2.4">3.1.2.1</a>, <a href="#rfc.xref.Part2.5">3.2</a>, <a href="#rfc.xref.Part2.6">4.1</a>, <a href="#rfc.xref.Part2.7">7.1.2.2</a>, <a href="#rfc.xref.Part2.8">7.1.4</a>, <a href="#rfc.xref.Part2.9">7.2.3</a>, <a href="#rfc.xref.Part2.10">7.2.3</a>, <a href="#rfc.xref.Part2.11">7.2.3</a>, <a href="#rfc.xref.Part2.12">7.2.3</a>, <a href="#rfc.xref.Part2.13">9.8</a>, <a href="#rfc.xref.Part2.14">11.6</a>, <a href="#rfc.xref.Part2.15">11.6</a>, <a href="#Part2"><b>13.1</b></a><ul>
     3901                        <li><em>Section 2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.2">3.1.1.1</a></li>
     3902                        <li><em>Section 3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.5">3.2</a></li>
     3903                        <li><em>Section 4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.4">3.1.2.1</a></li>
    38983904                        <li><em>Section 6.1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.7">7.1.2.2</a>, <a href="#rfc.xref.Part2.8">7.1.4</a></li>
    3899                         <li><em>Section 6.9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.4">4.1.2</a></li>
     3905                        <li><em>Section 6.9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.6">4.1</a></li>
    39003906                        <li><em>Section 7.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.9">7.2.3</a></li>
    39013907                        <li><em>Section 7.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.12">7.2.3</a></li>
    … …  
    39033909                        <li><em>Section 7.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.13">9.8</a></li>
    39043910                        <li><em>Section 7.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.15">11.6</a></li>
    3905                         <li><em>Section 7.4.15</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.5">4.1.2</a>, <a href="#rfc.xref.Part2.14">11.6</a></li>
     3911                        <li><em>Section 7.4.15</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.3">3.1.1.2</a>, <a href="#rfc.xref.Part2.14">11.6</a></li>
    39063912                        <li><em>Section 8.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.10">7.2.3</a>, <a href="#rfc.xref.Part2.11">7.2.3</a></li>
    39073913                     </ul>
    … …  
    39613967                  <li><em>RFC3040</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3040.1">2.4</a>, <a href="#RFC3040"><b>13.2</b></a></li>
    39623968                  <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">10.1</a>, <a href="#RFC3864"><b>13.2</b></a></li>
    3963                   <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">1</a>, <a href="#rfc.xref.RFC3986.2">2.7</a>, <a href="#rfc.xref.RFC3986.3">2.7</a>, <a href="#rfc.xref.RFC3986.4">2.7</a>, <a href="#rfc.xref.RFC3986.5">2.7</a>, <a href="#rfc.xref.RFC3986.6">2.7</a>, <a href="#rfc.xref.RFC3986.7">2.7</a>, <a href="#rfc.xref.RFC3986.8">2.7</a>, <a href="#rfc.xref.RFC3986.9">2.7</a>, <a href="#rfc.xref.RFC3986.10">2.7</a>, <a href="#rfc.xref.RFC3986.11">2.7</a>, <a href="#rfc.xref.RFC3986.12">2.7</a>, <a href="#rfc.xref.RFC3986.13">2.7</a>, <a href="#rfc.xref.RFC3986.14">2.7.1</a>, <a href="#rfc.xref.RFC3986.15">2.7.1</a>, <a href="#rfc.xref.RFC3986.16">2.7.3</a>, <a href="#rfc.xref.RFC3986.17">2.7.3</a>, <a href="#rfc.xref.RFC3986.18">4.1.2</a>, <a href="#rfc.xref.RFC3986.19">4.1.2</a>, <a href="#rfc.xref.RFC3986.20">4.3</a>, <a href="#RFC3986"><b>13.1</b></a><ul>
    3964                         <li><em>Section 2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.17">2.7.3</a>, <a href="#rfc.xref.RFC3986.18">4.1.2</a></li>
     3969                  <li><em>RFC3986</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.1">1</a>, <a href="#rfc.xref.RFC3986.2">2.7</a>, <a href="#rfc.xref.RFC3986.3">2.7</a>, <a href="#rfc.xref.RFC3986.4">2.7</a>, <a href="#rfc.xref.RFC3986.5">2.7</a>, <a href="#rfc.xref.RFC3986.6">2.7</a>, <a href="#rfc.xref.RFC3986.7">2.7</a>, <a href="#rfc.xref.RFC3986.8">2.7</a>, <a href="#rfc.xref.RFC3986.9">2.7</a>, <a href="#rfc.xref.RFC3986.10">2.7</a>, <a href="#rfc.xref.RFC3986.11">2.7</a>, <a href="#rfc.xref.RFC3986.12">2.7</a>, <a href="#rfc.xref.RFC3986.13">2.7</a>, <a href="#rfc.xref.RFC3986.14">2.7.1</a>, <a href="#rfc.xref.RFC3986.15">2.7.1</a>, <a href="#rfc.xref.RFC3986.16">2.7.3</a>, <a href="#rfc.xref.RFC3986.17">2.7.3</a>, <a href="#rfc.xref.RFC3986.18">3.1.1.2</a>, <a href="#rfc.xref.RFC3986.19">4.1</a>, <a href="#rfc.xref.RFC3986.20">4.3</a>, <a href="#RFC3986"><b>13.1</b></a><ul>
     3970                        <li><em>Section 2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.17">2.7.3</a>, <a href="#rfc.xref.RFC3986.19">4.1</a></li>
    39653971                        <li><em>Section 3.2</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.8">2.7</a></li>
    39663972                        <li><em>Section 3.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.15">2.7.1</a></li>
    … …  
    39693975                        <li><em>Section 3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.9">2.7</a>, <a href="#rfc.xref.RFC3986.10">2.7</a></li>
    39703976                        <li><em>Section 3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.12">2.7</a></li>
    3971                         <li><em>Section 3.5</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.19">4.1.2</a></li>
     3977                        <li><em>Section 3.5</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.18">3.1.1.2</a></li>
    39723978                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.5">2.7</a></li>
    39733979                        <li><em>Section 4.2</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3986.7">2.7</a></li>

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

    r1431 r1432  
    11901190   ignored by some clients or cause others to cease parsing.
    11911191</t>
     1192
     1193<section title="Request-Line" anchor="request-line">
     1194  <x:anchor-alias value="Request-Line"/>
     1195<t>
     1196   The Request-Line begins with a method token, followed by a single
     1197   space (SP), the request-target, another single space (SP), the
     1198   protocol version, and ending with CRLF.
     1199</t>
     1200<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Request-Line"/>
     1201  <x:ref>Request-Line</x:ref>   = <x:ref>Method</x:ref> <x:ref>SP</x:ref> <x:ref>request-target</x:ref> <x:ref>SP</x:ref> <x:ref>HTTP-Version</x:ref> <x:ref>CRLF</x:ref>
     1202</artwork></figure>
     1203
     1204<section title="Method" anchor="method">
     1205  <x:anchor-alias value="Method"/>
     1206<t>
     1207   The Method token indicates the request method to be performed on the
     1208   target resource. The request method is case-sensitive.
     1209</t>
     1210<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Method"/>
     1211  <x:ref>Method</x:ref>         = <x:ref>token</x:ref>
     1212</artwork></figure>
     1213<t>
     1214   See &method; for further information, such as the list of methods defined
     1215   by this specification, the IANA registry, and considerations for new methods.
     1216</t>
     1217</section>
     1218
     1219<section title="request-target" anchor="request-target">
     1220  <x:anchor-alias value="request-target"/>
     1221<t>
     1222   The request-target identifies the target resource upon which to apply
     1223   the request.  The four options for request-target are described in
     1224   <xref target="request-target-types"/>.
     1225</t>
     1226<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="request-target"/>
     1227  <x:ref>request-target</x:ref> = "*"
     1228                 / <x:ref>absolute-URI</x:ref>
     1229                 / ( <x:ref>path-absolute</x:ref> [ "?" <x:ref>query</x:ref> ] )
     1230                 / <x:ref>authority</x:ref>
     1231</artwork></figure>
     1232<t>
     1233   HTTP does not place a pre-defined limit on the length of a request-target.
     1234   A server &MUST; be prepared to receive URIs of unbounded length and
     1235   respond with the 414 (URI Too Long) status code if the received
     1236   request-target would be longer than the server wishes to handle
     1237   (see &status-414;).
     1238</t>
     1239<t>
     1240   Various ad-hoc limitations on request-target length are found in practice.
     1241   It is &RECOMMENDED; that all HTTP senders and recipients support
     1242   request-target lengths of 8000 or more octets.
     1243</t>
     1244<x:note>
     1245  <t>
     1246    <x:h>Note:</x:h> Fragments (<xref target="RFC3986" x:fmt="," x:sec="3.5"/>)
     1247    are not part of the request-target and thus will not be transmitted
     1248    in an HTTP request.
     1249  </t>
     1250</x:note>
     1251</section>
     1252</section>
     1253
     1254<section title="Status-Line" anchor="status-line">
     1255  <x:anchor-alias value="Status-Line"/>
     1256<t>
     1257   The first line of a Response message is the Status-Line, consisting
     1258   of the protocol version, a space (SP), the status code, another space,
     1259   a possibly-empty textual phrase describing the status code, and
     1260   ending with CRLF.
     1261</t>
     1262<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Status-Line"/>
     1263  <x:ref>Status-Line</x:ref> = <x:ref>HTTP-Version</x:ref> <x:ref>SP</x:ref> <x:ref>Status-Code</x:ref> <x:ref>SP</x:ref> <x:ref>Reason-Phrase</x:ref> <x:ref>CRLF</x:ref>
     1264</artwork></figure>
     1265
     1266<section title="Status Code" anchor="status.code">
     1267  <x:anchor-alias value="Status-Code"/>
     1268<t>
     1269   The Status-Code element is a 3-digit integer result code of the attempt to
     1270   understand and satisfy the request. See &status-code-reasonphr; for
     1271   further information, such as the list of status codes defined by this
     1272   specification, the IANA registry, and considerations for new status codes.
     1273</t>
     1274<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Status-Code"/>
     1275  <x:ref>Status-Code</x:ref>    = 3<x:ref>DIGIT</x:ref>
     1276</artwork></figure>
     1277<t>
     1278   The first digit of the Status-Code defines the class of response. The
     1279   last two digits do not have any categorization role. There are 5
     1280   values for the first digit:
     1281  <list style="symbols">
     1282    <t>
     1283      1xx: Informational - Request received, continuing process
     1284    </t>
     1285    <t>
     1286      2xx: Success - The action was successfully received,
     1287        understood, and accepted
     1288    </t>
     1289    <t>
     1290      3xx: Redirection - Further action must be taken in order to
     1291        complete the request
     1292    </t>
     1293    <t>
     1294      4xx: Client Error - The request contains bad syntax or cannot
     1295        be fulfilled
     1296    </t>
     1297    <t>
     1298      5xx: Server Error - The server failed to fulfill an apparently
     1299        valid request
     1300    </t>
     1301  </list>
     1302</t>
     1303</section>
     1304
     1305<section title="Reason Phrase" anchor="reason.phrase">
     1306  <x:anchor-alias value="Reason-Phrase"/>
     1307<t>   
     1308   The Reason Phrase exists for the sole purpose of providing a textual
     1309   description associated with the numeric status code, out of deference to
     1310   earlier Internet application protocols that were more frequently used with
     1311   interactive text clients. A client &SHOULD; ignore the content of the Reason
     1312   Phrase.
     1313</t>
     1314<figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Reason-Phrase"/>
     1315  <x:ref>Reason-Phrase</x:ref>  = *( <x:ref>HTAB</x:ref> / <x:ref>SP</x:ref> / <x:ref>VCHAR</x:ref> / <x:ref>obs-text</x:ref> )
     1316</artwork></figure>
     1317</section>
     1318</section>
     1319
    11921320</section>
    11931321
    … …  
    14631591   For response messages, whether or not a message-body is included with
    14641592   a message is dependent on both the request method and the response
    1465    status code (<xref target="status.code.and.reason.phrase"/>).
     1593   status code (<xref target="status.code"/>).
    14661594   Responses to the HEAD request method never include a message-body
    14671595   because the associated response header fields (e.g., Transfer-Encoding,
    … …  
    16711799</artwork></figure>
    16721800
    1673 <section title="Request-Line" anchor="request-line">
    1674   <x:anchor-alias value="Request-Line"/>
    1675 <t>
    1676    The Request-Line begins with a method token, followed by a single
    1677    space (SP), the request-target, another single space (SP), the
    1678    protocol version, and ending with CRLF.
    1679 </t>
    1680 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Request-Line"/>
    1681   <x:ref>Request-Line</x:ref>   = <x:ref>Method</x:ref> <x:ref>SP</x:ref> <x:ref>request-target</x:ref> <x:ref>SP</x:ref> <x:ref>HTTP-Version</x:ref> <x:ref>CRLF</x:ref>
    1682 </artwork></figure>
    1683 
    1684 <section title="Method" anchor="method">
    1685   <x:anchor-alias value="Method"/>
    1686 <t>
    1687    The Method token indicates the request method to be performed on the
    1688    target resource. The request method is case-sensitive.
    1689 </t>
    1690 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Method"/>
    1691   <x:ref>Method</x:ref>         = <x:ref>token</x:ref>
    1692 </artwork></figure>
    1693 <t>
    1694    See &method; for further information, such as the list of methods defined
    1695    by this specification, the IANA registry, and considerations for new methods.
    1696 </t>
    1697 </section>
    1698 
    1699 <section title="request-target" anchor="request-target">
    1700   <x:anchor-alias value="request-target"/>
    1701 <t>
    1702    The request-target identifies the target resource upon which to apply
    1703    the request.  In most cases, the user agent is provided a URI reference
     1801<section title="Types of Request Target" anchor="request-target-types">
     1802<t>
     1803   In most cases, the user agent is provided a URI reference
    17041804   from which it determines an absolute URI for identifying the target
    17051805   resource.  When a request to the resource is initiated, all or part
    17061806   of that URI is used to construct the HTTP request-target.
    17071807</t>
    1708 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="request-target"/>
    1709   <x:ref>request-target</x:ref> = "*"
    1710                  / <x:ref>absolute-URI</x:ref>
    1711                  / ( <x:ref>path-absolute</x:ref> [ "?" <x:ref>query</x:ref> ] )
    1712                  / <x:ref>authority</x:ref>
    1713 </artwork></figure>
    17141808<t>
    17151809   The four options for request-target are dependent on the nature of the
    … …  
    18171911  </t>
    18181912</x:note>
    1819 <t>
    1820    HTTP does not place a pre-defined limit on the length of a request-target.
    1821    A server &MUST; be prepared to receive URIs of unbounded length and
    1822    respond with the 414 (URI Too Long) status code if the received
    1823    request-target would be longer than the server wishes to handle
    1824    (see &status-414;).
    1825 </t>
    1826 <t>
    1827    Various ad-hoc limitations on request-target length are found in practice.
    1828    It is &RECOMMENDED; that all HTTP senders and recipients support
    1829    request-target lengths of 8000 or more octets.
    1830 </t>
    1831 <x:note>
    1832   <t>
    1833     <x:h>Note:</x:h> Fragments (<xref target="RFC3986" x:fmt="," x:sec="3.5"/>)
    1834     are not part of the request-target and thus will not be transmitted
    1835     in an HTTP request.
    1836   </t>
    1837 </x:note>
    1838 </section>
    18391913</section>
    18401914
    … …  
    19732047                  [ <x:ref>message-body</x:ref> ]          ; <xref target="message.body"/>
    19742048</artwork></figure>
    1975 
    1976 <section title="Status-Line" anchor="status-line">
    1977   <x:anchor-alias value="Status-Line"/>
    1978 <t>
    1979    The first line of a Response message is the Status-Line, consisting
    1980    of the protocol version, a space (SP), the status code, another space,
    1981    a possibly-empty textual phrase describing the status code, and
    1982    ending with CRLF.
    1983 </t>
    1984 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Status-Line"/>
    1985   <x:ref>Status-Line</x:ref> = <x:ref>HTTP-Version</x:ref> <x:ref>SP</x:ref> <x:ref>Status-Code</x:ref> <x:ref>SP</x:ref> <x:ref>Reason-Phrase</x:ref> <x:ref>CRLF</x:ref>
    1986 </artwork></figure>
    1987 
    1988 <section title="Status Code and Reason Phrase" anchor="status.code.and.reason.phrase">
    1989   <x:anchor-alias value="Reason-Phrase"/>
    1990   <x:anchor-alias value="Status-Code"/>
    1991 <t>
    1992    The Status-Code element is a 3-digit integer result code of the attempt to
    1993    understand and satisfy the request. See &status-code-reasonphr; for
    1994    further information, such as the list of status codes defined by this
    1995    specification, the IANA registry, and considerations for new status codes.
    1996 </t>
    1997 <t>   
    1998    The Reason Phrase exists for the sole purpose of providing a textual
    1999    description associated with the numeric status code, out of deference to
    2000    earlier Internet application protocols that were more frequently used with
    2001    interactive text clients. A client &SHOULD; ignore the content of the Reason
    2002    Phrase.
    2003 </t>
    2004 <t>
    2005    The first digit of the Status-Code defines the class of response. The
    2006    last two digits do not have any categorization role. There are 5
    2007    values for the first digit:
    2008   <list style="symbols">
    2009     <t>
    2010       1xx: Informational - Request received, continuing process
    2011     </t>
    2012     <t>
    2013       2xx: Success - The action was successfully received,
    2014         understood, and accepted
    2015     </t>
    2016     <t>
    2017       3xx: Redirection - Further action must be taken in order to
    2018         complete the request
    2019     </t>
    2020     <t>
    2021       4xx: Client Error - The request contains bad syntax or cannot
    2022         be fulfilled
    2023     </t>
    2024     <t>
    2025       5xx: Server Error - The server failed to fulfill an apparently
    2026         valid request
    2027     </t>
    2028   </list>
    2029 </t>
    2030 <figure><artwork type="abnf2616"><iref primary="true" item="Grammar" subitem="Status-Code"/><iref primary="true" item="Grammar" subitem="Reason-Phrase"/>
    2031   <x:ref>Status-Code</x:ref>    = 3<x:ref>DIGIT</x:ref>
    2032   <x:ref>Reason-Phrase</x:ref>  = *( <x:ref>HTAB</x:ref> / <x:ref>SP</x:ref> / <x:ref>VCHAR</x:ref> / <x:ref>obs-text</x:ref> )
    2033 </artwork></figure>
    2034 </section>
    2035 </section>
    20362049
    20372050</section>
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