Ignore:
Timestamp:
02/03/08 17:21:57 (14 years ago)
Author:
julian.reschke@…
Message:

add linking between ABNF rules (does not affect TXT version), relates to #36.

File:
1 edited

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  • draft-ietf-httpbis/latest/p3-payload.html

    r228 r229  
    591591      <p id="rfc.section.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation.abnf" title="Augmented BNF">Section 2.1</a> of <a href="#Part1" id="rfc.xref.Part1.1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> and the core rules defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>: <span class="comment">[abnf.dep: ABNF syntax and basic rules will be adopted from RFC 5234, see &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;.]</span>
    592592      </p>
    593       <div id="rfc.figure.u.1"></div><pre class="inline">  ALPHA          = &lt;ALPHA, defined in <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
    594   DIGIT          = &lt;DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
    595   OCTET          = &lt;OCTET, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
    596 </pre><div id="rfc.figure.u.2"></div><pre class="inline">  quoted-string  = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
    597   token          = &lt;token, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     593      <div id="rfc.figure.u.1"></div><pre class="inline">  <a href="#notation" class="smpl">ALPHA</a>          = &lt;ALPHA, defined in <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     594  <a href="#notation" class="smpl">DIGIT</a>          = &lt;DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     595  <a href="#notation" class="smpl">OCTET</a>          = &lt;OCTET, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     596</pre><div id="rfc.figure.u.2"></div><pre class="inline">  <a href="#notation" class="smpl">quoted-string</a>  = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     597  <a href="#notation" class="smpl">token</a>          = &lt;token, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
    598598</pre><div id="abnf.dependencies">
    599          <p id="rfc.section.2.p.4">The ABNF rules below are defined in other parts:</p>
     599         <p id="rfc.section.2.p.4">                The ABNF rules below are defined in other parts:</p>
    600600      </div>
    601       <div id="rfc.figure.u.3"></div><pre class="inline">  absoluteURI    = &lt;absoluteURI, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#general.syntax" title="General Syntax">Section 3.2.1</a>&gt;
    602   Content-Length = &lt;Content-Length, defined in <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>&gt;
    603   relativeURI    = &lt;relativeURI, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#general.syntax" title="General Syntax">Section 3.2.1</a>&gt;
    604   message-header = &lt;message-header, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#message.headers" title="Message Headers">Section 4.2</a>&gt;
    605 </pre><div id="rfc.figure.u.4"></div><pre class="inline">  Allow          = &lt;Allow, defined in <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 10.1</a>&gt;
    606 </pre><div id="rfc.figure.u.5"></div><pre class="inline">  Last-Modified  = &lt;Last-Modified, defined in <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 7.6</a>&gt;
    607 </pre><div id="rfc.figure.u.6"></div><pre class="inline">  Content-Range  = &lt;Content-Range, defined in <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 6.2</a>&gt;
    608 </pre><div id="rfc.figure.u.7"></div><pre class="inline">  Expires        = &lt;Expires, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 16.3</a>&gt;
     601      <div id="rfc.figure.u.3"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">absoluteURI</a>    = &lt;absoluteURI, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#general.syntax" title="General Syntax">Section 3.2.1</a>&gt;
     602  <a href="#abnf.dependencies" class="smpl">Content-Length</a> = &lt;Content-Length, defined in <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>&gt;
     603  <a href="#abnf.dependencies" class="smpl">relativeURI</a>    = &lt;relativeURI, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#general.syntax" title="General Syntax">Section 3.2.1</a>&gt;
     604  <a href="#abnf.dependencies" class="smpl">message-header</a> = &lt;message-header, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#message.headers" title="Message Headers">Section 4.2</a>&gt;
     605</pre><div id="rfc.figure.u.4"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Allow</a>          = &lt;Allow, defined in <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 10.1</a>&gt;
     606</pre><div id="rfc.figure.u.5"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Last-Modified</a>  = &lt;Last-Modified, defined in <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 7.6</a>&gt;
     607</pre><div id="rfc.figure.u.6"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Content-Range</a>  = &lt;Content-Range, defined in <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 6.2</a>&gt;
     608</pre><div id="rfc.figure.u.7"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Expires</a>        = &lt;Expires, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 16.3</a>&gt;
    609609</pre><h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
    610610      <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="character.sets" href="#character.sets">Character Sets</a></h2>
    … …  
    623623         </dd>
    624624      </dl>
    625       <p id="rfc.section.3.1.p.4">HTTP character sets are identified by case-insensitive tokens. The complete set of tokens is defined by the IANA Character
    626          Set registry (&lt;<a href="http://www.iana.org/assignments/character-sets">http://www.iana.org/assignments/character-sets</a>&gt;).
    627       </p>
    628       <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  charset = token
     625      <div id="rule.charset">
     626         <p id="rfc.section.3.1.p.4">  HTTP character sets are identified by case-insensitive tokens. The complete set of tokens is defined by the IANA Character
     627            Set registry (&lt;<a href="http://www.iana.org/assignments/character-sets">http://www.iana.org/assignments/character-sets</a>&gt;).
     628         </p>
     629      </div>
     630      <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  <a href="#rule.charset" class="smpl">charset</a> = <a href="#notation" class="smpl">token</a>
    629631</pre><p id="rfc.section.3.1.p.6">Although HTTP allows an arbitrary token to be used as a charset value, any token that has a predefined value within the IANA
    630632         Character Set registry <em class="bcp14">MUST</em> represent the character set defined by that registry. Applications <em class="bcp14">SHOULD</em> limit their use of character sets to those defined by the IANA registry.
    … …  
    649651         decoded by the recipient.
    650652      </p>
    651       <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.2"></span>  content-coding   = token
     653      <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.2"></span>  <a href="#content.codings" class="smpl">content-coding</a>   = <a href="#notation" class="smpl">token</a>
    652654</pre><p id="rfc.section.3.2.p.3">All content-coding values are case-insensitive. HTTP/1.1 uses content-coding values in the Accept-Encoding (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.1" title="Accept-Encoding">Section&nbsp;6.3</a>) and Content-Encoding (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.1" title="Content-Encoding">Section&nbsp;6.5</a>) header fields. Although the value describes the content-coding, what is more important is that it indicates what decoding
    653655         mechanism will be required to remove the encoding.
    … …  
    693695      <p id="rfc.section.3.3.p.1">HTTP uses Internet Media Types <a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> in the Content-Type (<a href="#header.content-type" id="rfc.xref.header.content-type.1" title="Content-Type">Section&nbsp;6.9</a>) and Accept (<a href="#header.accept" id="rfc.xref.header.accept.1" title="Accept">Section&nbsp;6.1</a>) header fields in order to provide open and extensible data typing and type negotiation.
    694696      </p>
    695       <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span><span id="rfc.iref.g.6"></span>  media-type     = type "/" subtype *( ";" parameter )
    696   type           = token
    697   subtype        = token
    698 </pre><p id="rfc.section.3.3.p.3">Parameters <em class="bcp14">MAY</em> follow the type/subtype in the form of attribute/value pairs.
    699       </p>
    700       <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span>  parameter               = attribute "=" value
    701   attribute               = token
    702   value                   = token | quoted-string
     697      <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span><span id="rfc.iref.g.6"></span>  <a href="#media.types" class="smpl">media-type</a>     = <a href="#media.types" class="smpl">type</a> "/" <a href="#media.types" class="smpl">subtype</a> *( ";" <a href="#rule.parameter" class="smpl">parameter</a> )
     698  <a href="#media.types" class="smpl">type</a>           = <a href="#notation" class="smpl">token</a>
     699  <a href="#media.types" class="smpl">subtype</a>        = <a href="#notation" class="smpl">token</a>
     700</pre><div id="rule.parameter">
     701         <p id="rfc.section.3.3.p.3">      Parameters <em class="bcp14">MAY</em> follow the type/subtype in the form of attribute/value pairs.
     702         </p>
     703      </div>
     704      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span>  <a href="#rule.parameter" class="smpl">parameter</a>               = <a href="#rule.parameter" class="smpl">attribute</a> "=" <a href="#rule.parameter" class="smpl">value</a>
     705  <a href="#rule.parameter" class="smpl">attribute</a>               = <a href="#notation" class="smpl">token</a>
     706  <a href="#rule.parameter" class="smpl">value</a>                   = <a href="#notation" class="smpl">token</a> | <a href="#notation" class="smpl">quoted-string</a>
    703707</pre><p id="rfc.section.3.3.p.5">The type, subtype, and parameter attribute names are case-insensitive. Parameter values might or might not be case-sensitive,
    704708         depending on the semantics of the parameter name. Linear white space (LWS) <em class="bcp14">MUST NOT</em> be used between the type and subtype, nor between an attribute and its value. The presence or absence of a parameter might
    … …  
    751755         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.
    752756      </p>
    753       <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.10"></span>  qvalue         = ( "0" [ "." 0*3DIGIT ] )
     757      <div id="rfc.figure.u.12"></div><pre class="inline"><span id="rfc.iref.g.10"></span>  <a href="#quality.values" class="smpl">qvalue</a>         = ( "0" [ "." 0*3<a href="#notation" class="smpl">DIGIT</a> ] )
    754758                 | ( "1" [ "." 0*3("0") ] )
    755759</pre><p id="rfc.section.3.4.p.3">"Quality values" is a misnomer, since these values merely represent relative degradation in desired quality.</p>
    … …  
    761765      <p id="rfc.section.3.5.p.2">The syntax and registry of HTTP language tags is the same as that defined by <a href="#RFC1766" id="rfc.xref.RFC1766.1"><cite title="Tags for the Identification of Languages">[RFC1766]</cite></a>. In summary, a language tag is composed of 1 or more parts: A primary language tag and a possibly empty series of subtags:
    762766      </p>
    763       <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span>  language-tag  = primary-tag *( "-" subtag )
    764   primary-tag   = 1*8ALPHA
    765   subtag        = 1*8ALPHA
     767      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span>  <a href="#language.tags" class="smpl">language-tag</a>  = <a href="#language.tags" class="smpl">primary-tag</a> *( "-" <a href="#language.tags" class="smpl">subtag</a> )
     768  <a href="#language.tags" class="smpl">primary-tag</a>   = 1*8<a href="#notation" class="smpl">ALPHA</a>
     769  <a href="#language.tags" class="smpl">subtag</a>        = 1*8<a href="#notation" class="smpl">ALPHA</a>
    766770</pre><p id="rfc.section.3.5.p.4">White space is not allowed within the tag and all tags are case-insensitive. The name space of language tags is administered
    767771         by the IANA. Example tags include:
    … …  
    783787         by the request.
    784788      </p>
    785       <div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  entity-header  = Allow                    ; <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 10.1</a>
    786                  | Content-Encoding         ; <a href="#header.content-encoding" id="rfc.xref.header.content-encoding.2" title="Content-Encoding">Section&nbsp;6.5</a>
    787                  | Content-Language         ; <a href="#header.content-language" id="rfc.xref.header.content-language.1" title="Content-Language">Section&nbsp;6.6</a>
    788                  | Content-Length           ; <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>
    789                  | Content-Location         ; <a href="#header.content-location" id="rfc.xref.header.content-location.1" title="Content-Location">Section&nbsp;6.7</a>
    790                  | Content-MD5              ; <a href="#header.content-md5" id="rfc.xref.header.content-md5.1" title="Content-MD5">Section&nbsp;6.8</a>
    791                  | Content-Range            ; <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 6.2</a>
    792                  | Content-Type             ; <a href="#header.content-type" id="rfc.xref.header.content-type.2" title="Content-Type">Section&nbsp;6.9</a>
    793                  | Expires                  ; <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 16.3</a>
    794                  | Last-Modified            ; <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 7.6</a>
    795                  | extension-header
     789      <div id="rfc.figure.u.15"></div><pre class="inline"><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  <a href="#entity.header.fields" class="smpl">entity-header</a>  = <a href="#abnf.dependencies" class="smpl">Allow</a>                    ; <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 10.1</a>
     790                 | <a href="#header.content-encoding" class="smpl">Content-Encoding</a>         ; <a href="#header.content-encoding" id="rfc.xref.header.content-encoding.2" title="Content-Encoding">Section&nbsp;6.5</a>
     791                 | <a href="#header.content-language" class="smpl">Content-Language</a>         ; <a href="#header.content-language" id="rfc.xref.header.content-language.1" title="Content-Language">Section&nbsp;6.6</a>
     792                 | <a href="#abnf.dependencies" class="smpl">Content-Length</a>           ; <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>
     793                 | <a href="#header.content-location" class="smpl">Content-Location</a>         ; <a href="#header.content-location" id="rfc.xref.header.content-location.1" title="Content-Location">Section&nbsp;6.7</a>
     794                 | <a href="#header.content-md5" class="smpl">Content-MD5</a>              ; <a href="#header.content-md5" id="rfc.xref.header.content-md5.1" title="Content-MD5">Section&nbsp;6.8</a>
     795                 | <a href="#abnf.dependencies" class="smpl">Content-Range</a>            ; <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 6.2</a>
     796                 | <a href="#header.content-type" class="smpl">Content-Type</a>             ; <a href="#header.content-type" id="rfc.xref.header.content-type.2" title="Content-Type">Section&nbsp;6.9</a>
     797                 | <a href="#abnf.dependencies" class="smpl">Expires</a>                  ; <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 16.3</a>
     798                 | <a href="#abnf.dependencies" class="smpl">Last-Modified</a>            ; <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 7.6</a>
     799                 | <a href="#entity.header.fields" class="smpl">extension-header</a>
    796800 
    797   extension-header = message-header
     801  <a href="#entity.header.fields" class="smpl">extension-header</a> = <a href="#abnf.dependencies" class="smpl">message-header</a>
    798802</pre><p id="rfc.section.4.1.p.3">The extension-header mechanism allows additional entity-header fields to be defined without changing the protocol, but these
    799803         fields cannot be assumed to be recognizable by the recipient. Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored by the recipient and <em class="bcp14">MUST</em> be forwarded by transparent proxies.
    … …  
    801805      <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="entity.body" href="#entity.body">Entity Body</a></h2>
    802806      <p id="rfc.section.4.2.p.1">The entity-body (if any) sent with an HTTP request or response is in a format and encoding defined by the entity-header fields.</p>
    803       <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.16"></span>  entity-body    = *OCTET
     807      <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.16"></span>  <a href="#entity.body" class="smpl">entity-body</a>    = *<a href="#notation" class="smpl">OCTET</a>
    804808</pre><p id="rfc.section.4.2.p.3">An entity-body is only present in a message when a message-body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.13"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure
    805809         safe and proper transfer of the message.
    … …  
    913917         for an in-line image.
    914918      </p>
    915       <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  Accept         = "Accept" ":"
    916                    #( media-range [ accept-params ] )
     919      <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  <a href="#header.accept" class="smpl">Accept</a>         = "Accept" ":"
     920                   #( <a href="#header.accept" class="smpl">media-range</a> [ <a href="#header.accept" class="smpl">accept-params</a> ] )
    917921 
    918   media-range    = ( "*/*"
    919                    | ( type "/" "*" )
    920                    | ( type "/" subtype )
    921                    ) *( ";" parameter )
    922   accept-params  = ";" "q" "=" qvalue *( accept-extension )
    923   accept-extension = ";" token [ "=" ( token | quoted-string ) ]
     922  <a href="#header.accept" class="smpl">media-range</a>    = ( "*/*"
     923                   | ( <a href="#media.types" class="smpl">type</a> "/" "*" )
     924                   | ( <a href="#media.types" class="smpl">type</a> "/" <a href="#media.types" class="smpl">subtype</a> )
     925                   ) *( ";" <a href="#rule.parameter" class="smpl">parameter</a> )
     926  <a href="#header.accept" class="smpl">accept-params</a>  = ";" "q" "=" <a href="#quality.values" class="smpl">qvalue</a> *( <a href="#header.accept" class="smpl">accept-extension</a> )
     927  <a href="#header.accept" class="smpl">accept-extension</a> = ";" <a href="#notation" class="smpl">token</a> [ "=" ( <a href="#notation" class="smpl">token</a> | <a href="#notation" class="smpl">quoted-string</a> ) ]
    924928</pre><p id="rfc.section.6.1.p.3">The asterisk "*" character is used to group media types into ranges, with "*/*" indicating all media types and "type/*" indicating
    925929         all subtypes of that type. The media-range <em class="bcp14">MAY</em> include media type parameters that are applicable to that range.
    … …  
    982986         to a server which is capable of representing documents in those character sets.
    983987      </p>
    984       <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  Accept-Charset = "Accept-Charset" ":"
    985           1#( ( charset | "*" ) [ ";" "q" "=" qvalue ] )
     988      <div id="rfc.figure.u.25"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  <a href="#header.accept-charset" class="smpl">Accept-Charset</a> = "Accept-Charset" ":"
     989          1#( ( <a href="#rule.charset" class="smpl">charset</a> | "*" ) [ ";" "q" "=" <a href="#quality.values" class="smpl">qvalue</a> ] )
    986990</pre><p id="rfc.section.6.2.p.3">Character set values are described in <a href="#character.sets" title="Character Sets">Section&nbsp;3.1</a>. Each charset <em class="bcp14">MAY</em> be given an associated quality value which represents the user's preference for that charset. The default value is q=1. An
    987991         example is
    … …  
    10011005      <p id="rfc.section.6.3.p.1">The Accept-Encoding request-header field is similar to Accept, but restricts the content-codings (<a href="#content.codings" title="Content Codings">Section&nbsp;3.2</a>) that are acceptable in the response.
    10021006      </p>
    1003       <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  Accept-Encoding  = "Accept-Encoding" ":"
    1004                      #( codings [ ";" "q" "=" qvalue ] )
    1005   codings          = ( content-coding | "*" )
     1007      <div id="rfc.figure.u.27"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  <a href="#header.accept-encoding" class="smpl">Accept-Encoding</a>  = "Accept-Encoding" ":"
     1008                     #( <a href="#header.accept-encoding" class="smpl">codings</a> [ ";" "q" "=" <a href="#quality.values" class="smpl">qvalue</a> ] )
     1009  <a href="#header.accept-encoding" class="smpl">codings</a>          = ( <a href="#content.codings" class="smpl">content-coding</a> | "*" )
    10061010</pre><p id="rfc.section.6.3.p.3">Examples of its use are:</p>
    10071011      <div id="rfc.figure.u.28"></div><pre class="text">    Accept-Encoding: compress, gzip
    … …  
    10471051         as a response to the request. Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;3.5</a>.
    10481052      </p>
    1049       <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  Accept-Language = "Accept-Language" ":"
    1050                     1#( language-range [ ";" "q" "=" qvalue ] )
    1051   language-range  = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
     1053      <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  <a href="#header.accept-language" class="smpl">Accept-Language</a> = "Accept-Language" ":"
     1054                    1#( <a href="#header.accept-language" class="smpl">language-range</a> [ ";" "q" "=" <a href="#quality.values" class="smpl">qvalue</a> ] )
     1055  <a href="#header.accept-language" class="smpl">language-range</a>  = ( ( 1*8<a href="#notation" class="smpl">ALPHA</a> *( "-" 1*8<a href="#notation" class="smpl">ALPHA</a> ) ) | "*" )
    10521056</pre><p id="rfc.section.6.4.p.3">Each language-range <em class="bcp14">MAY</em> be given an associated quality value which represents an estimate of the user's preference for the languages specified by
    10531057         that range. The quality value defaults to "q=1". For example,
    … …  
    10911095         without losing the identity of its underlying media type.
    10921096      </p>
    1093       <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  Content-Encoding  = "Content-Encoding" ":" 1#content-coding
     1097      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  <a href="#header.content-encoding" class="smpl">Content-Encoding</a>  = "Content-Encoding" ":" 1#<a href="#content.codings" class="smpl">content-coding</a>
    10941098</pre><p id="rfc.section.6.5.p.3">Content codings are defined in <a href="#content.codings" title="Content Codings">Section&nbsp;3.2</a>. An example of its use is
    10951099      </p>
    … …  
    11111115         Note that this might not be equivalent to all the languages used within the entity-body.
    11121116      </p>
    1113       <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.27"></span>  Content-Language  = "Content-Language" ":" 1#language-tag
     1117      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.27"></span>  <a href="#header.content-language" class="smpl">Content-Language</a>  = "Content-Language" ":" 1#<a href="#language.tags" class="smpl">language-tag</a>
    11141118</pre><p id="rfc.section.6.6.p.3">Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;3.5</a>. The primary purpose of Content-Language is to allow a user to identify and differentiate entities according to the user's
    11151119         own preferred language. Thus, if the body content is intended only for a Danish-literate audience, the appropriate field is
    … …  
    11381142         accessed, the server <em class="bcp14">SHOULD</em> provide a Content-Location for the particular variant which is returned.
    11391143      </p>
    1140       <div id="rfc.figure.u.36"></div><pre class="inline"><span id="rfc.iref.g.28"></span>  Content-Location = "Content-Location" ":"
    1141                     ( absoluteURI | relativeURI )
     1144      <div id="rfc.figure.u.36"></div><pre class="inline"><span id="rfc.iref.g.28"></span>  <a href="#header.content-location" class="smpl">Content-Location</a> = "Content-Location" ":"
     1145                    ( <a href="#abnf.dependencies" class="smpl">absoluteURI</a> | <a href="#abnf.dependencies" class="smpl">relativeURI</a> )
    11421146</pre><p id="rfc.section.6.7.p.3">The value of Content-Location also defines the base URI for the entity.</p>
    11431147      <p id="rfc.section.6.7.p.4">The Content-Location value is not a replacement for the original requested URI; it is only a statement of the location of
    … …  
    11571161         attacks.)
    11581162      </p>
    1159       <div id="rfc.figure.u.37"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  Content-MD5   = "Content-MD5" ":" md5-digest
    1160   md5-digest    = &lt;base64 of 128 bit MD5 digest as per <a href="#RFC1864" id="rfc.xref.RFC1864.2"><cite title="The Content-MD5 Header Field">[RFC1864]</cite></a>&gt;
     1163      <div id="rfc.figure.u.37"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  <a href="#header.content-md5" class="smpl">Content-MD5</a>   = "Content-MD5" ":" <a href="#header.content-md5" class="smpl">md5-digest</a>
     1164  <a href="#header.content-md5" class="smpl">md5-digest</a>    = &lt;base64 of 128 bit MD5 digest as per <a href="#RFC1864" id="rfc.xref.RFC1864.2"><cite title="The Content-MD5 Header Field">[RFC1864]</cite></a>&gt;
    11611165</pre><p id="rfc.section.6.8.p.3">The Content-MD5 header field <em class="bcp14">MAY</em> be generated by an origin server or client to function as an integrity check of the entity-body. Only origin servers or clients <em class="bcp14">MAY</em> generate the Content-MD5 header field; proxies and gateways <em class="bcp14">MUST NOT</em> generate it, as this would defeat its value as an end-to-end integrity check. Any recipient of the entity-body, including
    11621166         gateways and proxies, <em class="bcp14">MAY</em> check that the digest value in this header field matches that of the entity-body as received.
    … …  
    11941198         the HEAD method, the media type that would have been sent had the request been a GET.
    11951199      </p>
    1196       <div id="rfc.figure.u.38"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  Content-Type   = "Content-Type" ":" media-type
     1200      <div id="rfc.figure.u.38"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  <a href="#header.content-type" class="smpl">Content-Type</a>   = "Content-Type" ":" <a href="#media.types" class="smpl">media-type</a>
    11971201</pre><p id="rfc.section.6.9.p.3">Media types are defined in <a href="#media.types" title="Media Types">Section&nbsp;3.3</a>. An example of the field is
    11981202      </p>
    … …  
    14131417         environments.
    14141418      </p>
    1415       <div id="rfc.figure.u.40"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  MIME-Version   = "MIME-Version" ":" 1*DIGIT "." 1*DIGIT
     1419      <div id="rfc.figure.u.40"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  <a href="#mime-version" class="smpl">MIME-Version</a>   = "MIME-Version" ":" 1*<a href="#notation" class="smpl">DIGIT</a> "." 1*<a href="#notation" class="smpl">DIGIT</a>
    14161420</pre><p id="rfc.section.A.1.p.3">MIME version "1.0" is the default for use in HTTP/1.1. However, HTTP/1.1 message parsing and semantics are defined by this
    14171421         document and not the MIME specification.
    … …  
    14671471         in <a href="#RFC1806" id="rfc.xref.RFC1806.3"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header">[RFC1806]</cite></a>.
    14681472      </p>
    1469       <div id="rfc.figure.u.41"></div><pre class="inline"><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span>  content-disposition = "Content-Disposition" ":"
    1470                         disposition-type *( ";" disposition-parm )
    1471   disposition-type = "attachment" | disp-extension-token
    1472   disposition-parm = filename-parm | disp-extension-parm
    1473   filename-parm = "filename" "=" quoted-string
    1474   disp-extension-token = token
    1475   disp-extension-parm = token "=" ( token | quoted-string )
     1473      <div id="rfc.figure.u.41"></div><pre class="inline"><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span>  <a href="#content-disposition" class="smpl">content-disposition</a> = "Content-Disposition" ":"
     1474                        <a href="#content-disposition" class="smpl">disposition-type</a> *( ";" <a href="#content-disposition" class="smpl">disposition-parm</a> )
     1475  <a href="#content-disposition" class="smpl">disposition-type</a> = "attachment" | <a href="#content-disposition" class="smpl">disp-extension-token</a>
     1476  <a href="#content-disposition" class="smpl">disposition-parm</a> = <a href="#content-disposition" class="smpl">filename-parm</a> | <a href="#content-disposition" class="smpl">disp-extension-parm</a>
     1477  <a href="#content-disposition" class="smpl">filename-parm</a> = "filename" "=" <a href="#notation" class="smpl">quoted-string</a>
     1478  <a href="#content-disposition" class="smpl">disp-extension-token</a> = <a href="#notation" class="smpl">token</a>
     1479  <a href="#content-disposition" class="smpl">disp-extension-parm</a> = <a href="#notation" class="smpl">token</a> "=" ( <a href="#notation" class="smpl">token</a> | <a href="#notation" class="smpl">quoted-string</a> )
    14761480</pre><p id="rfc.section.B.1.p.3">An example is</p>
    14771481      <div id="rfc.figure.u.42"></div><pre class="text">     Content-Disposition: attachment; filename="fname.ext"
    … …  
    15891593                  <li class="indline1">compress&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.1">3.2</a></li>
    15901594                  <li class="indline1">Content-Base header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.9"><b>C.1</b></a></li>
    1591                   <li class="indline1">Content-Disposition header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.c.7"><b>B.1</b></a></li>
     1595                  <li class="indline1">Content-Disposition header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.c.7"><b>B.1</b></a>, <a class="iref" href="#rfc.extref.c.22">B.1</a></li>
    15921596                  <li class="indline1">Content-Encoding header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.c.2"><b>6.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">6.5</a></li>
    15931597                  <li class="indline1">Content-Language header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">4.1</a>, <a class="iref" href="#rfc.iref.c.3"><b>6.6</b></a></li>
    … …  
    16571661                        <li class="indline1">Alternate&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.11"><b>C.1</b></a></li>
    16581662                        <li class="indline1">Content-Base&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.17"><b>C.1</b></a></li>
    1659                         <li class="indline1">Content-Disposition&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.h.10"><b>B.1</b></a></li>
     1663                        <li class="indline1">Content-Disposition&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.h.10"><b>B.1</b></a>, <a class="iref" href="#rfc.extref.c.22">B.1</a></li>
    16601664                        <li class="indline1">Content-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.h.5"><b>6.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">6.5</a></li>
    16611665                        <li class="indline1">Content-Language&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">4.1</a>, <a class="iref" href="#rfc.iref.h.6"><b>6.6</b></a></li>
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