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

    r923 r939  
    859859  <a href="#abnf.dependencies" class="smpl">response-header</a> = &lt;response-header, defined in <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 5</a>&gt;
    860860</pre><div id="rfc.figure.u.13"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">entity-header</a>   = &lt;entity-header, defined in <a href="#Part3" id="rfc.xref.Part3.2"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>&gt;
     861  <a href="#abnf.dependencies" class="smpl">MIME-Version</a>    = &lt;MIME-Version, defined in <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#mime-version" title="MIME-Version">Appendix A.1</a>&gt;
    861862</pre><div id="rfc.figure.u.14"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">Cache-Control</a>   = &lt;Cache-Control, defined in <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 3.4</a>&gt;
    862863  <a href="#abnf.dependencies" class="smpl">Pragma</a>          = &lt;Pragma, defined in <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.pragma" title="Pragma">Section 3.4</a>&gt;
     
    13011302                 / <a href="#header.via" class="smpl">Via</a>                      ; <a href="#header.via" id="rfc.xref.header.via.1" title="Via">Section&nbsp;9.9</a>
    13021303                 / <a href="#abnf.dependencies" class="smpl">Warning</a>                  ; <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.warning" title="Warning">Section 3.6</a>
     1304                 / <a href="#abnf.dependencies" class="smpl">MIME-Version</a>             ; <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#mime-version" title="MIME-Version">Appendix A.1</a>
    13031305</pre><p id="rfc.section.3.4.p.3">General-header field names can be extended reliably only in combination with a change in the protocol version. However, new
    13041306         or experimental header fields might be given the semantics of general header fields if all parties in the communication recognize
     
    13121314                  *(( <a href="#general.header.fields" class="smpl">general-header</a>        ; <a href="#general.header.fields" title="General Header Fields">Section&nbsp;3.4</a>
    13131315                   / <a href="#abnf.dependencies" class="smpl">request-header</a>         ; <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#request.header.fields" title="Request Header Fields">Section 3</a>
    1314                    / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> ) ; <a href="#Part3" id="rfc.xref.Part3.3"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
     1316                   / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> ) ; <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
    13151317                  <a href="#core.rules" class="smpl">CRLF</a>
    13161318                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;3.3</a>
     
    14421444                  *(( <a href="#general.header.fields" class="smpl">general-header</a>        ; <a href="#general.header.fields" title="General Header Fields">Section&nbsp;3.4</a>
    14431445                   / <a href="#abnf.dependencies" class="smpl">response-header</a>        ; <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#response.header.fields" title="Response Header Fields">Section 5</a>
    1444                    / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> ) ; <a href="#Part3" id="rfc.xref.Part3.4"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
     1446                   / <a href="#abnf.dependencies" class="smpl">entity-header</a> ) <a href="#core.rules" class="smpl">CRLF</a> ) ; <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#entity.header.fields" title="Entity Header Fields">Section 3.1</a>
    14451447                  <a href="#core.rules" class="smpl">CRLF</a>
    14461448                  [ <a href="#message.body" class="smpl">message-body</a> ]          ; <a href="#message.body" title="Message Body">Section&nbsp;3.3</a>
     
    16901692         <li>Pointer to specification text</li>
    16911693      </ul>
    1692       <p id="rfc.section.6.2.3.p.3">Names of transfer codings <em class="bcp14">MUST NOT</em> overlap with names of content codings (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.5"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>), unless the encoding transformation is identical (as it is the case for the compression codings defined in <a href="#compression.codings" title="Compression Codings">Section&nbsp;6.2.2</a>).
     1694      <p id="rfc.section.6.2.3.p.3">Names of transfer codings <em class="bcp14">MUST NOT</em> overlap with names of content codings (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>), unless the encoding transformation is identical (as it is the case for the compression codings defined in <a href="#compression.codings" title="Compression Codings">Section&nbsp;6.2.2</a>).
    16931695      </p>
    16941696      <p id="rfc.section.6.2.3.p.4">Values to be added to this name space require expert review and a specification (see "Expert Review" and "Specification Required"
     
    17101712      </p>
    17111713      <h2 id="rfc.section.6.4"><a href="#rfc.section.6.4">6.4</a>&nbsp;<a id="quality.values" href="#quality.values">Quality Values</a></h2>
    1712       <p id="rfc.section.6.4.p.1">Both transfer codings (TE request header, <a href="#header.te" id="rfc.xref.header.te.3" title="TE">Section&nbsp;9.5</a>) and content negotiation (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 4</a> of <a href="#Part3" id="rfc.xref.Part3.6"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) use short "floating point" numbers to indicate the relative importance ("weight") of various negotiable parameters. A weight
     1714      <p id="rfc.section.6.4.p.1">Both transfer codings (TE request header, <a href="#header.te" id="rfc.xref.header.te.3" title="TE">Section&nbsp;9.5</a>) and content negotiation (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 4</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) use short "floating point" numbers to indicate the relative importance ("weight") of various negotiable parameters. A weight
    17131715         is normalized to a real number in the range 0 through 1, where 0 is the minimum and 1 the maximum value. If a parameter has
    17141716         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.
     
    18421844         </p>
    18431845      </div>
    1844       <p id="rfc.section.7.1.3.2.p.8">A transparent proxy <em class="bcp14">MUST</em> preserve the message payload (<a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>), though it <em class="bcp14">MAY</em> change the message-body through application or removal of a transfer-coding (<a href="#transfer.codings" title="Transfer Codings">Section&nbsp;6.2</a>).
     1846      <p id="rfc.section.7.1.3.2.p.8">A transparent proxy <em class="bcp14">MUST</em> preserve the message payload (<a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>), though it <em class="bcp14">MAY</em> change the message-body through application or removal of a transfer-coding (<a href="#transfer.codings" title="Transfer Codings">Section&nbsp;6.2</a>).
    18451847      </p>
    18461848      <h3 id="rfc.section.7.1.4"><a href="#rfc.section.7.1.4">7.1.4</a>&nbsp;<a id="persistent.practical" href="#persistent.practical">Practical Considerations</a></h3>
     
    21702172      <h2 id="rfc.section.9.7"><a href="#rfc.section.9.7">9.7</a>&nbsp;<a id="header.transfer-encoding" href="#header.transfer-encoding">Transfer-Encoding</a></h2>
    21712173      <p id="rfc.section.9.7.p.1">The "Transfer-Encoding" general-header field indicates what transfer-codings (if any) have been applied to the message body.
    2172          It differs from Content-Encoding (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) in that transfer-codings are a property of the message (and therefore are removed by intermediaries), whereas content-codings
     2174         It differs from Content-Encoding (<a href="p3-payload.html#content.codings" title="Content Codings">Section 2.2</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) in that transfer-codings are a property of the message (and therefore are removed by intermediaries), whereas content-codings
    21732175         are not.
    21742176      </p>
     
    28622864      </p>
    28632865      <p id="rfc.section.A.p.4">The character set of a representation <em class="bcp14">SHOULD</em> be labeled as the lowest common denominator of the character codes used within that representation, with the exception that
    2864          not labeling the representation is preferred over labeling the representation with the labels US-ASCII or ISO-8859-1. See <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
     2866         not labeling the representation is preferred over labeling the representation with the labels US-ASCII or ISO-8859-1. See <a href="#Part3" id="rfc.xref.Part3.11"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>.
    28652867      </p>
    28662868      <p id="rfc.section.A.p.5">Additional rules for requirements on parsing and encoding of dates and other potential problems with date encodings include:</p>
     
    29952997<a href="#header.host" class="smpl">Host-v</a> = uri-host [ ":" port ]
    29962998
     2999<a href="#abnf.dependencies" class="smpl">MIME-Version</a> = &lt;MIME-Version, defined in [Part3], Appendix A.1&gt;
    29973000<a href="#method" class="smpl">Method</a> = token
    29983001
     
    30753078
    30763079<a href="#general.header.fields" class="smpl">general-header</a> = Cache-Control / Connection / Date / Pragma / Trailer
    3077  / Transfer-Encoding / Upgrade / Via / Warning
     3080 / Transfer-Encoding / Upgrade / Via / Warning / MIME-Version
    30783081
    30793082<a href="#header.fields" class="smpl">header-field</a> = field-name ":" OWS [ field-value ] OWS
     
    34113414         </li>
    34123415         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/83">http://tools.ietf.org/wg/httpbis/trac/ticket/83</a>&gt;: "OPTIONS * and proxies"
     3416         </li>
     3417         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/122">http://tools.ietf.org/wg/httpbis/trac/ticket/122</a>&gt;: "MIME-Version not listed in P1, general header fields"
    34133418         </li>
    34143419         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/143">http://tools.ietf.org/wg/httpbis/trac/ticket/143</a>&gt;: "IANA registry for content/transfer encodings"
     
    36723677                     </ul>
    36733678                  </li>
    3674                   <li class="indline1"><em>Part3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a>, <a class="iref" href="#rfc.xref.Part3.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.3">4</a>, <a class="iref" href="#rfc.xref.Part3.4">5</a>, <a class="iref" href="#rfc.xref.Part3.5">6.2.3</a>, <a class="iref" href="#rfc.xref.Part3.6">6.4</a>, <a class="iref" href="#rfc.xref.Part3.7">7.1.3.2</a>, <a class="iref" href="#rfc.xref.Part3.8">9.7</a>, <a class="iref" href="#Part3"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part3.9">A</a><ul class="ind">
    3675                         <li class="indline1"><em>Section 2.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.5">6.2.3</a>, <a class="iref" href="#rfc.xref.Part3.8">9.7</a></li>
    3676                         <li class="indline1"><em>Section 3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.3">4</a>, <a class="iref" href="#rfc.xref.Part3.4">5</a></li>
    3677                         <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.6">6.4</a></li>
     3679                  <li class="indline1"><em>Part3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a>, <a class="iref" href="#rfc.xref.Part3.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.4">3.4</a>, <a class="iref" href="#rfc.xref.Part3.5">4</a>, <a class="iref" href="#rfc.xref.Part3.6">5</a>, <a class="iref" href="#rfc.xref.Part3.7">6.2.3</a>, <a class="iref" href="#rfc.xref.Part3.8">6.4</a>, <a class="iref" href="#rfc.xref.Part3.9">7.1.3.2</a>, <a class="iref" href="#rfc.xref.Part3.10">9.7</a>, <a class="iref" href="#Part3"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part3.11">A</a><ul class="ind">
     3680                        <li class="indline1"><em>Section 2.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.7">6.2.3</a>, <a class="iref" href="#rfc.xref.Part3.10">9.7</a></li>
     3681                        <li class="indline1"><em>Section 3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.2">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.5">4</a>, <a class="iref" href="#rfc.xref.Part3.6">5</a></li>
     3682                        <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.8">6.4</a></li>
    36783683                        <li class="indline1"><em>Appendix A</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.1">1</a></li>
     3684                        <li class="indline1"><em>Appendix A.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part3.3">1.2.3</a>, <a class="iref" href="#rfc.xref.Part3.4">3.4</a></li>
    36793685                     </ul>
    36803686                  </li>
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