Ignore:
Timestamp:
20/01/13 14:57:02 (10 years ago)
Author:
fielding@…
Message:

(editorial) move status codes to where they are used; no text changes

File:
1 edited

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  • draft-ietf-httpbis/latest/p5-range.html

    r2142 r2143  
    474474      <link rel="Chapter" title="2 Range Units" href="#rfc.section.2">
    475475      <link rel="Chapter" title="3 Range Requests" href="#rfc.section.3">
    476       <link rel="Chapter" title="4 Status Code Definitions" href="#rfc.section.4">
    477       <link rel="Chapter" title="5 Responses to a Range Request" href="#rfc.section.5">
    478       <link rel="Chapter" title="6 IANA Considerations" href="#rfc.section.6">
    479       <link rel="Chapter" title="7 Security Considerations" href="#rfc.section.7">
    480       <link rel="Chapter" title="8 Acknowledgments" href="#rfc.section.8">
    481       <link rel="Chapter" href="#rfc.section.9" title="9 References">
     476      <link rel="Chapter" title="4 Responses to a Range Request" href="#rfc.section.4">
     477      <link rel="Chapter" title="5 IANA Considerations" href="#rfc.section.5">
     478      <link rel="Chapter" title="6 Security Considerations" href="#rfc.section.6">
     479      <link rel="Chapter" title="7 Acknowledgments" href="#rfc.section.7">
     480      <link rel="Chapter" href="#rfc.section.8" title="8 References">
    482481      <link rel="Appendix" title="A Internet Media Type multipart/byteranges" href="#rfc.section.A">
    483482      <link rel="Appendix" title="B Changes from RFC 2616" href="#rfc.section.B">
    … …  
    587586            </ul>
    588587         </li>
    589          <li><a href="#rfc.section.4">4.</a>&nbsp;&nbsp;&nbsp;<a href="#status.code.definitions">Status Code Definitions</a><ul>
    590                <li><a href="#rfc.section.4.1">4.1</a>&nbsp;&nbsp;&nbsp;<a href="#status.206">206 Partial Content</a></li>
    591                <li><a href="#rfc.section.4.2">4.2</a>&nbsp;&nbsp;&nbsp;<a href="#status.416">416 Range Not Satisfiable</a></li>
     588         <li><a href="#rfc.section.4">4.</a>&nbsp;&nbsp;&nbsp;<a href="#range.response">Responses to a Range Request</a><ul>
     589               <li><a href="#rfc.section.4.1">4.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.4.1">Response to a Single and Multiple Ranges Request</a></li>
     590               <li><a href="#rfc.section.4.2">4.2</a>&nbsp;&nbsp;&nbsp;<a href="#status.206">206 Partial Content</a></li>
     591               <li><a href="#rfc.section.4.3">4.3</a>&nbsp;&nbsp;&nbsp;<a href="#status.416">416 Range Not Satisfiable</a></li>
     592               <li><a href="#rfc.section.4.4">4.4</a>&nbsp;&nbsp;&nbsp;<a href="#header.content-range">Content-Range</a></li>
     593               <li><a href="#rfc.section.4.5">4.5</a>&nbsp;&nbsp;&nbsp;<a href="#combining.byte.ranges">Combining Ranges</a></li>
    592594            </ul>
    593595         </li>
    594          <li><a href="#rfc.section.5">5.</a>&nbsp;&nbsp;&nbsp;<a href="#range.response">Responses to a Range Request</a><ul>
    595                <li><a href="#rfc.section.5.1">5.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.5.1">Response to a Single and Multiple Ranges Request</a></li>
    596                <li><a href="#rfc.section.5.2">5.2</a>&nbsp;&nbsp;&nbsp;<a href="#header.content-range">Content-Range</a></li>
    597                <li><a href="#rfc.section.5.3">5.3</a>&nbsp;&nbsp;&nbsp;<a href="#combining.byte.ranges">Combining Ranges</a></li>
    598             </ul>
    599          </li>
    600          <li><a href="#rfc.section.6">6.</a>&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
    601                <li><a href="#rfc.section.6.1">6.1</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registry">Range Unit Registry</a><ul>
    602                      <li><a href="#rfc.section.6.1.1">6.1.1</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registry.procedure">Procedure</a></li>
    603                      <li><a href="#rfc.section.6.1.2">6.1.2</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registration">Registrations</a></li>
     596         <li><a href="#rfc.section.5">5.</a>&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
     597               <li><a href="#rfc.section.5.1">5.1</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registry">Range Unit Registry</a><ul>
     598                     <li><a href="#rfc.section.5.1.1">5.1.1</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registry.procedure">Procedure</a></li>
     599                     <li><a href="#rfc.section.5.1.2">5.1.2</a>&nbsp;&nbsp;&nbsp;<a href="#range.unit.registration">Registrations</a></li>
    604600                  </ul>
    605601               </li>
    606                <li><a href="#rfc.section.6.2">6.2</a>&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registration</a></li>
    607                <li><a href="#rfc.section.6.3">6.3</a>&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
     602               <li><a href="#rfc.section.5.2">5.2</a>&nbsp;&nbsp;&nbsp;<a href="#status.code.registration">Status Code Registration</a></li>
     603               <li><a href="#rfc.section.5.3">5.3</a>&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
    608604            </ul>
    609605         </li>
    610          <li><a href="#rfc.section.7">7.</a>&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
    611                <li><a href="#rfc.section.7.1">7.1</a>&nbsp;&nbsp;&nbsp;<a href="#overlapping.ranges">Overlapping Ranges</a></li>
     606         <li><a href="#rfc.section.6">6.</a>&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul>
     607               <li><a href="#rfc.section.6.1">6.1</a>&nbsp;&nbsp;&nbsp;<a href="#overlapping.ranges">Overlapping Ranges</a></li>
    612608            </ul>
    613609         </li>
    614          <li><a href="#rfc.section.8">8.</a>&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
    615          <li><a href="#rfc.section.9">9.</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
    616                <li><a href="#rfc.section.9.1">9.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    617                <li><a href="#rfc.section.9.2">9.2</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     610         <li><a href="#rfc.section.7">7.</a>&nbsp;&nbsp;&nbsp;<a href="#acks">Acknowledgments</a></li>
     611         <li><a href="#rfc.section.8">8.</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
     612               <li><a href="#rfc.section.8.1">8.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     613               <li><a href="#rfc.section.8.2">8.2</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    618614            </ul>
    619615         </li>
    … …  
    657653      <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="range.units" href="#range.units">Range Units</a></h1>
    658654      <p id="rfc.section.2.p.1">A representation can be partitioned into subranges according to various structural units, depending on the structure inherent
    659          in the representation's media type. Such a <dfn>range unit</dfn> can be used in the <a href="#header.range" class="smpl">Range</a> (<a href="#header.range" id="rfc.xref.header.range.1" title="Range">Section&nbsp;3.1</a>) and <a href="#header.content-range" class="smpl">Content-Range</a> (<a href="#header.content-range" id="rfc.xref.header.content-range.1" title="Content-Range">Section&nbsp;5.2</a>) header fields to delineate the parts of a representation that are either requested or transferred, respectively.
     655         in the representation's media type. Such a <dfn>range unit</dfn> can be used in the <a href="#header.range" class="smpl">Range</a> (<a href="#header.range" id="rfc.xref.header.range.1" title="Range">Section&nbsp;3.1</a>) and <a href="#header.content-range" class="smpl">Content-Range</a> (<a href="#header.content-range" id="rfc.xref.header.content-range.1" title="Content-Range">Section&nbsp;4.4</a>) header fields to delineate the parts of a representation that are either requested or transferred, respectively.
    660656      </p>
    661657      <div id="rfc.figure.u.1"></div><pre class="inline"><span id="rfc.iref.g.1"></span><span id="rfc.iref.g.2"></span><span id="rfc.iref.g.3"></span>  <a href="#range.units" class="smpl">range-unit</a>       = <a href="#range.units" class="smpl">bytes-unit</a> / <a href="#range.units" class="smpl">other-range-unit</a>
    … …  
    722718      </ul>
    723719      <h2 id="rfc.section.2.2"><a href="#rfc.section.2.2">2.2</a>&nbsp;<a id="range.units.other" href="#range.units.other">Other Range Units</a></h2>
    724       <p id="rfc.section.2.2.p.1">The only range unit defined by HTTP/1.1 is "bytes" (<a href="#byte.ranges" title="Byte Ranges">Section&nbsp;2.1</a>). Additional units can be defined as described in <a href="#range.unit.registry" title="Range Unit Registry">Section&nbsp;6.1</a>.
     720      <p id="rfc.section.2.2.p.1">The only range unit defined by HTTP/1.1 is "bytes" (<a href="#byte.ranges" title="Byte Ranges">Section&nbsp;2.1</a>). Additional units can be defined as described in <a href="#range.unit.registry" title="Range Unit Registry">Section&nbsp;5.1</a>.
    725721      </p>
    726722      <div id="rfc.iref.a.1"></div>
    … …  
    758754      </p>
    759755      <p id="rfc.section.3.1.p.7">If all of the preconditions are true, the server supports the Range header field for the target resource, the specified range(s)
    760          are syntactically correct (as defined in <a href="#byte.ranges" title="Byte Ranges">Section&nbsp;2.1</a>), and at least one of the ranges has a non-empty intersection with the current selected representation extent, then the server <em class="bcp14">MAY</em> respond with a status code of <a href="#status.206" class="smpl">206 (Partial Content)</a> and a payload containing one or more partial representations that correspond to those requested, as defined in <a href="#range.response" title="Responses to a Range Request">Section&nbsp;5</a>.
     756         are syntactically correct (as defined in <a href="#byte.ranges" title="Byte Ranges">Section&nbsp;2.1</a>), and at least one of the ranges has a non-empty intersection with the current selected representation extent, then the server <em class="bcp14">MAY</em> respond with a status code of <a href="#status.206" class="smpl">206 (Partial Content)</a> and a payload containing one or more partial representations that correspond to those requested, as defined in <a href="#range.response" title="Responses to a Range Request">Section&nbsp;4</a>.
    761757      </p>
    762758      <div id="rfc.iref.i.1"></div>
    … …  
    781777         resource, then the server <em class="bcp14">SHOULD</em> send the specified sub-range of the representation using a <a href="#status.206" class="smpl">206 (Partial Content)</a> response. If the validator does not match, then the server <em class="bcp14">SHOULD</em> send the entire representation using a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response.
    782778      </p>
    783       <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="status.code.definitions" href="#status.code.definitions">Status Code Definitions</a></h1>
    784       <div id="rfc.iref.18"></div>
    785       <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="status.206" href="#status.206">206 Partial Content</a></h2>
    786       <p id="rfc.section.4.1.p.1">The <dfn>206 (Partial Content)</dfn> status code indicates that the server has fulfilled the partial GET request for the resource. The request <em class="bcp14">MUST</em> have included a <a href="#header.range" class="smpl">Range</a> header field (<a href="#header.range" id="rfc.xref.header.range.2" title="Range">Section&nbsp;3.1</a>) indicating the desired range, and <em class="bcp14">MAY</em> have included an <a href="#header.if-range" class="smpl">If-Range</a> header field (<a href="#header.if-range" id="rfc.xref.header.if-range.2" title="If-Range">Section&nbsp;3.2</a>) to make the request conditional.
    787       </p>
    788       <p id="rfc.section.4.1.p.2">When a 206 response is generated, the sender <em class="bcp14">MUST</em> generate the following header fields:
    789       </p>
    790       <ul>
    791          <li>Either a <a href="#header.content-range" class="smpl">Content-Range</a> header field (<a href="#header.content-range" id="rfc.xref.header.content-range.2" title="Content-Range">Section&nbsp;5.2</a>) indicating the range included with this response, or a multipart/byteranges <a href="p2-semantics.html#header.content-type" class="smpl">Content-Type</a> including Content-Range fields for each part. If a <a href="p1-messaging.html#header.content-length" class="smpl">Content-Length</a> header field is present in the response, its value <em class="bcp14">MUST</em> match the actual number of octets transmitted in the message body.
    792          </li>
    793          <li>Date</li>
    794          <li> <a href="p6-cache.html#header.cache-control" class="smpl">Cache-Control</a>, <a href="p4-conditional.html#header.etag" class="smpl">ETag</a>, <a href="p6-cache.html#header.expires" class="smpl">Expires</a>, <a href="p2-semantics.html#header.content-location" class="smpl">Content-Location</a> and/or <a href="p2-semantics.html#header.vary" class="smpl">Vary</a>, if the header field would have been sent in a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response to the same request
    795          </li>
    796       </ul>
    797       <p id="rfc.section.4.1.p.3">If a 206 is generated in response to a request with an <a href="#header.if-range" class="smpl">If-Range</a> header field, the sender <em class="bcp14">SHOULD NOT</em> generate other representation header fields beyond those described above. Otherwise, the sender <em class="bcp14">MUST</em> generate all of the same representation header fields that would have been sent in a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response to the same request.
    798       </p>
    799       <p id="rfc.section.4.1.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 4.1.2</a> of <a href="#Part6" id="rfc.xref.Part6.1"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Caching">[Part6]</cite></a>) to determine freshness for 206 responses.
    800       </p>
    801       <div id="rfc.iref.18"></div>
    802       <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="status.416" href="#status.416">416 Range Not Satisfiable</a></h2>
    803       <p id="rfc.section.4.2.p.1">The <dfn>416 (Range Not Satisfiable)</dfn> status code indicates that none of the ranges-specifier values in the request's <a href="#header.range" class="smpl">Range</a> header field (<a href="#header.range" id="rfc.xref.header.range.3" title="Range">Section&nbsp;3.1</a>) overlap the current extent of the selected resource and the request did not include an <a href="#header.if-range" class="smpl">If-Range</a> header field (<a href="#header.if-range" id="rfc.xref.header.if-range.3" title="If-Range">Section&nbsp;3.2</a>). (For byte-ranges, this means that the first-byte-pos of all of the byte-range-spec values were greater than the current
    804          length of the selected representation.)
    805       </p>
    806       <p id="rfc.section.4.2.p.2">When this status code is sent in response to a byte-range request, the sender <em class="bcp14">SHOULD</em> generate a <a href="#header.content-range" class="smpl">Content-Range</a> header field specifying the current length of the selected representation (see <a href="#header.content-range" id="rfc.xref.header.content-range.3" title="Content-Range">Section&nbsp;5.2</a>).
    807       </p>
    808       <div id="rfc.figure.u.15"></div>
    809       <p>For example:</p>  <pre class="text">HTTP/1.1 416 Range Not Satisfiable
    810 Date: Mon, 20 Jan 2012 15:41:54 GMT
    811 Content-Range: bytes */47022
    812 Content-Type: image/gif
    813 </pre><div class="note" id="rfc.section.4.2.p.4">
    814          <p> <b>Note:</b> Clients cannot depend on servers to send a <a href="#status.416" class="smpl">416 (Range Not
    815                Satisfiable)</a> response instead of a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response for an unsatisfiable <a href="#header.range" class="smpl">Range</a> header field, since not all servers implement this header field.
    816          </p>
    817       </div>
    818       <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="range.response" href="#range.response">Responses to a Range Request</a></h1>
    819       <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;Response to a Single and Multiple Ranges Request
     779      <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="range.response" href="#range.response">Responses to a Range Request</a></h1>
     780      <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;Response to a Single and Multiple Ranges Request
    820781      </h2>
    821       <p id="rfc.section.5.1.p.1">When an HTTP message includes the content of a single range (for example, a response to a request for a single range, or to
     782      <p id="rfc.section.4.1.p.1">When an HTTP message includes the content of a single range (for example, a response to a request for a single range, or to
    822783         a request for a set of ranges that overlap without any holes), this content is transmitted with a <a href="#header.content-range" class="smpl">Content-Range</a> header field, and a <a href="p1-messaging.html#header.content-length" class="smpl">Content-Length</a> header field showing the number of bytes actually transferred. For example,
    823784      </p>
    824       <div id="rfc.figure.u.16"></div><pre class="text">HTTP/1.1 206 Partial Content
     785      <div id="rfc.figure.u.15"></div><pre class="text">HTTP/1.1 206 Partial Content
    825786Date: Wed, 15 Nov 1995 06:25:24 GMT
    826787Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT
    … …  
    828789Content-Length: 26012
    829790Content-Type: image/gif
    830 </pre><p id="rfc.section.5.1.p.3">When an HTTP message includes the content of multiple ranges (for example, a response to a request for multiple non-overlapping
     791</pre><p id="rfc.section.4.1.p.3">When an HTTP message includes the content of multiple ranges (for example, a response to a request for multiple non-overlapping
    831792         ranges), these are transmitted as a multipart message. The multipart media type used for this purpose is "multipart/byteranges"
    832793         as defined in <a href="#internet.media.type.multipart.byteranges" title="Internet Media Type multipart/byteranges">Appendix&nbsp;A</a>.
    833794      </p>
    834       <p id="rfc.section.5.1.p.4">A server <em class="bcp14">MAY</em> combine requested ranges when those ranges are overlapping (see <a href="#overlapping.ranges" title="Overlapping Ranges">Section&nbsp;7.1</a>).
    835       </p>
    836       <p id="rfc.section.5.1.p.5">A response to a request for a single range <em class="bcp14">MUST NOT</em> be sent using the multipart/byteranges media type. A response to a request for multiple ranges, whose result is a single range, <em class="bcp14">MAY</em> be sent as a multipart/byteranges media type with one part. A client that cannot decode a multipart/byteranges message <em class="bcp14">MUST NOT</em> ask for multiple ranges in a single request.
    837       </p>
    838       <p id="rfc.section.5.1.p.6">When a client asks for multiple ranges in one request, the server <em class="bcp14">SHOULD</em> send them in the order that they appeared in the request.
    839       </p>
     795      <p id="rfc.section.4.1.p.4">A server <em class="bcp14">MAY</em> combine requested ranges when those ranges are overlapping (see <a href="#overlapping.ranges" title="Overlapping Ranges">Section&nbsp;6.1</a>).
     796      </p>
     797      <p id="rfc.section.4.1.p.5">A response to a request for a single range <em class="bcp14">MUST NOT</em> be sent using the multipart/byteranges media type. A response to a request for multiple ranges, whose result is a single range, <em class="bcp14">MAY</em> be sent as a multipart/byteranges media type with one part. A client that cannot decode a multipart/byteranges message <em class="bcp14">MUST NOT</em> ask for multiple ranges in a single request.
     798      </p>
     799      <p id="rfc.section.4.1.p.6">When a client asks for multiple ranges in one request, the server <em class="bcp14">SHOULD</em> send them in the order that they appeared in the request.
     800      </p>
     801      <div id="rfc.iref.18"></div>
     802      <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="status.206" href="#status.206">206 Partial Content</a></h2>
     803      <p id="rfc.section.4.2.p.1">The <dfn>206 (Partial Content)</dfn> status code indicates that the server has fulfilled the partial GET request for the resource. The request <em class="bcp14">MUST</em> have included a <a href="#header.range" class="smpl">Range</a> header field (<a href="#header.range" id="rfc.xref.header.range.2" title="Range">Section&nbsp;3.1</a>) indicating the desired range, and <em class="bcp14">MAY</em> have included an <a href="#header.if-range" class="smpl">If-Range</a> header field (<a href="#header.if-range" id="rfc.xref.header.if-range.2" title="If-Range">Section&nbsp;3.2</a>) to make the request conditional.
     804      </p>
     805      <p id="rfc.section.4.2.p.2">When a 206 response is generated, the sender <em class="bcp14">MUST</em> generate the following header fields:
     806      </p>
     807      <ul>
     808         <li>Either a <a href="#header.content-range" class="smpl">Content-Range</a> header field (<a href="#header.content-range" id="rfc.xref.header.content-range.2" title="Content-Range">Section&nbsp;4.4</a>) indicating the range included with this response, or a multipart/byteranges <a href="p2-semantics.html#header.content-type" class="smpl">Content-Type</a> including Content-Range fields for each part. If a <a href="p1-messaging.html#header.content-length" class="smpl">Content-Length</a> header field is present in the response, its value <em class="bcp14">MUST</em> match the actual number of octets transmitted in the message body.
     809         </li>
     810         <li>Date</li>
     811         <li> <a href="p6-cache.html#header.cache-control" class="smpl">Cache-Control</a>, <a href="p4-conditional.html#header.etag" class="smpl">ETag</a>, <a href="p6-cache.html#header.expires" class="smpl">Expires</a>, <a href="p2-semantics.html#header.content-location" class="smpl">Content-Location</a> and/or <a href="p2-semantics.html#header.vary" class="smpl">Vary</a>, if the header field would have been sent in a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response to the same request
     812         </li>
     813      </ul>
     814      <p id="rfc.section.4.2.p.3">If a 206 is generated in response to a request with an <a href="#header.if-range" class="smpl">If-Range</a> header field, the sender <em class="bcp14">SHOULD NOT</em> generate other representation header fields beyond those described above. Otherwise, the sender <em class="bcp14">MUST</em> generate all of the same representation header fields that would have been sent in a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response to the same request.
     815      </p>
     816      <p id="rfc.section.4.2.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 4.1.2</a> of <a href="#Part6" id="rfc.xref.Part6.1"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Caching">[Part6]</cite></a>) to determine freshness for 206 responses.
     817      </p>
     818      <div id="rfc.iref.18"></div>
     819      <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="status.416" href="#status.416">416 Range Not Satisfiable</a></h2>
     820      <p id="rfc.section.4.3.p.1">The <dfn>416 (Range Not Satisfiable)</dfn> status code indicates that none of the ranges-specifier values in the request's <a href="#header.range" class="smpl">Range</a> header field (<a href="#header.range" id="rfc.xref.header.range.3" title="Range">Section&nbsp;3.1</a>) overlap the current extent of the selected resource and the request did not include an <a href="#header.if-range" class="smpl">If-Range</a> header field (<a href="#header.if-range" id="rfc.xref.header.if-range.3" title="If-Range">Section&nbsp;3.2</a>). (For byte-ranges, this means that the first-byte-pos of all of the byte-range-spec values were greater than the current
     821         length of the selected representation.)
     822      </p>
     823      <p id="rfc.section.4.3.p.2">When this status code is sent in response to a byte-range request, the sender <em class="bcp14">SHOULD</em> generate a <a href="#header.content-range" class="smpl">Content-Range</a> header field specifying the current length of the selected representation (see <a href="#header.content-range" id="rfc.xref.header.content-range.3" title="Content-Range">Section&nbsp;4.4</a>).
     824      </p>
     825      <div id="rfc.figure.u.16"></div>
     826      <p>For example:</p>  <pre class="text">HTTP/1.1 416 Range Not Satisfiable
     827Date: Mon, 20 Jan 2012 15:41:54 GMT
     828Content-Range: bytes */47022
     829Content-Type: image/gif
     830</pre><div class="note" id="rfc.section.4.3.p.4">
     831         <p> <b>Note:</b> Clients cannot depend on servers to send a <a href="#status.416" class="smpl">416 (Range Not
     832               Satisfiable)</a> response instead of a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response for an unsatisfiable <a href="#header.range" class="smpl">Range</a> header field, since not all servers implement this header field.
     833         </p>
     834      </div>
    840835      <div id="rfc.iref.c.1"></div>
    841       <h2 id="rfc.section.5.2"><a href="#rfc.section.5.2">5.2</a>&nbsp;<a id="header.content-range" href="#header.content-range">Content-Range</a></h2>
    842       <p id="rfc.section.5.2.p.1">The "Content-Range" header field is sent with a partial representation to specify where in the full representation the payload
     836      <h2 id="rfc.section.4.4"><a href="#rfc.section.4.4">4.4</a>&nbsp;<a id="header.content-range" href="#header.content-range">Content-Range</a></h2>
     837      <p id="rfc.section.4.4.p.1">The "Content-Range" header field is sent with a partial representation to specify where in the full representation the payload
    843838         body is intended to be applied.
    844839      </p>
    … …  
    857852  <a href="#header.content-range" class="smpl">other-content-range</a> = <a href="#range.units" class="smpl">other-range-unit</a> <a href="#imported.abnf" class="smpl">SP</a> <a href="#header.content-range" class="smpl">other-range-resp</a>
    858853  <a href="#header.content-range" class="smpl">other-range-resp</a>    = *<a href="#imported.abnf" class="smpl">CHAR</a>
    859 </pre><p id="rfc.section.5.2.p.3">Range units are defined in <a href="#range.units" title="Range Units">Section&nbsp;2</a>. A recipient of a <a href="#status.206" class="smpl">206 (Partial Content)</a> response containing a <a href="#header.content-range" class="smpl">Content-Range</a> header field with a <a href="#range.units" class="smpl">range unit</a> that the recipient does not understand <em class="bcp14">MUST NOT</em> attempt to recombine it with a stored representation. A proxy that receives such a message <em class="bcp14">SHOULD</em> forward it downstream.
    860       </p>
    861       <p id="rfc.section.5.2.p.4">For byte ranges, a sender <em class="bcp14">SHOULD</em> indicate the complete length of the representation from which the range has been extracted unless the complete length is unknown
     854</pre><p id="rfc.section.4.4.p.3">Range units are defined in <a href="#range.units" title="Range Units">Section&nbsp;2</a>. A recipient of a <a href="#status.206" class="smpl">206 (Partial Content)</a> response containing a <a href="#header.content-range" class="smpl">Content-Range</a> header field with a <a href="#range.units" class="smpl">range unit</a> that the recipient does not understand <em class="bcp14">MUST NOT</em> attempt to recombine it with a stored representation. A proxy that receives such a message <em class="bcp14">SHOULD</em> forward it downstream.
     855      </p>
     856      <p id="rfc.section.4.4.p.4">For byte ranges, a sender <em class="bcp14">SHOULD</em> indicate the complete length of the representation from which the range has been extracted unless the complete length is unknown
    862857         or difficult to determine. An asterisk character ("*") in place of the complete-length indicates that the representation length
    863858         was unknown when the header field was generated.
    864859      </p>
    865       <p id="rfc.section.5.2.p.5">A Content-Range field value with a <a href="#header.content-range" class="smpl">byte-range-resp</a> that has a <a href="#rule.ranges-specifier" class="smpl">last-byte-pos</a> value less than its <a href="#rule.ranges-specifier" class="smpl">first-byte-pos</a> value, or a <a href="#header.content-range" class="smpl">complete-length</a> value less than or equal to its <a href="#rule.ranges-specifier" class="smpl">last-byte-pos</a> value, is invalid. The recipient of an invalid <a href="#header.content-range" class="smpl">Content-Range</a>  <em class="bcp14">MUST NOT</em> attempt to recombine the received content with a stored representation.
    866       </p>
    867       <p id="rfc.section.5.2.p.6">A server generating a <a href="#status.206" class="smpl">206 (Partial Content)</a> response to a byte range request <em class="bcp14">MUST</em> send, in each body-part of a multipart response or in the header block of a single part response, a Content-Range header field
     860      <p id="rfc.section.4.4.p.5">A Content-Range field value with a <a href="#header.content-range" class="smpl">byte-range-resp</a> that has a <a href="#rule.ranges-specifier" class="smpl">last-byte-pos</a> value less than its <a href="#rule.ranges-specifier" class="smpl">first-byte-pos</a> value, or a <a href="#header.content-range" class="smpl">complete-length</a> value less than or equal to its <a href="#rule.ranges-specifier" class="smpl">last-byte-pos</a> value, is invalid. The recipient of an invalid <a href="#header.content-range" class="smpl">Content-Range</a>  <em class="bcp14">MUST NOT</em> attempt to recombine the received content with a stored representation.
     861      </p>
     862      <p id="rfc.section.4.4.p.6">A server generating a <a href="#status.206" class="smpl">206 (Partial Content)</a> response to a byte range request <em class="bcp14">MUST</em> send, in each body-part of a multipart response or in the header block of a single part response, a Content-Range header field
    868863         containing a <a href="#header.content-range" class="smpl">byte-range-resp</a> value that reflects the corresponding range being sent. The following example would apply when the complete length of the
    869864         selected representation is known by the sender to be 1234 bytes:
    870865      </p>
    871866      <div id="rfc.figure.u.18"></div><pre class="text">  Content-Range: bytes 42-1233/1234
    872 </pre><p id="rfc.section.5.2.p.8">or this second example would apply when the complete length is unknown:</p>
     867</pre><p id="rfc.section.4.4.p.8">or this second example would apply when the complete length is unknown:</p>
    873868      <div id="rfc.figure.u.19"></div><pre class="text">  Content-Range: bytes 42-1233/*
    874 </pre><p id="rfc.section.5.2.p.10">A server generating a <a href="#status.416" class="smpl">416 (Range Not Satisfiable)</a> response to a byte range request <em class="bcp14">SHOULD</em> send a Content-Range header field with an <a href="#header.content-range" class="smpl">unsatisfied-range</a> value, as in the following example:
     869</pre><p id="rfc.section.4.4.p.10">A server generating a <a href="#status.416" class="smpl">416 (Range Not Satisfiable)</a> response to a byte range request <em class="bcp14">SHOULD</em> send a Content-Range header field with an <a href="#header.content-range" class="smpl">unsatisfied-range</a> value, as in the following example:
    875870      </p>
    876871      <div id="rfc.figure.u.20"></div><pre class="text">  Content-Range: bytes */1234
    877 </pre><p id="rfc.section.5.2.p.12">The complete-length in a 416 response indicates the current length of the selected representation, which will be known by
     872</pre><p id="rfc.section.4.4.p.12">The complete-length in a 416 response indicates the current length of the selected representation, which will be known by
    878873         the server generating the response because that is how it determined the range to be unsatisfiable.
    879874      </p>
    880       <p id="rfc.section.5.2.p.13">The "Content-Range" header field has no meaning for status codes that do not explicitly describe its semantic. For this specification,
     875      <p id="rfc.section.4.4.p.13">The "Content-Range" header field has no meaning for status codes that do not explicitly describe its semantic. For this specification,
    881876         only the <a href="#status.206" class="smpl">206 (Partial Content)</a> and <a href="#status.416" class="smpl">416 (Range Not Satisfiable)</a> status codes describe a meaning for Content-Range.
    882877      </p>
    883       <p id="rfc.section.5.2.p.14">More examples of Content-Range values, assuming that the representation contains a total of 1234 bytes: </p>
     878      <p id="rfc.section.4.4.p.14">More examples of Content-Range values, assuming that the representation contains a total of 1234 bytes: </p>
    884879      <ul>
    885880         <li>The first 500 bytes:
    … …  
    896891</pre> </li>
    897892      </ul>
    898       <h2 id="rfc.section.5.3"><a href="#rfc.section.5.3">5.3</a>&nbsp;<a id="combining.byte.ranges" href="#combining.byte.ranges">Combining Ranges</a></h2>
    899       <p id="rfc.section.5.3.p.1">A response might transfer only a subrange of a representation if the connection closed prematurely or if the request used
     893      <h2 id="rfc.section.4.5"><a href="#rfc.section.4.5">4.5</a>&nbsp;<a id="combining.byte.ranges" href="#combining.byte.ranges">Combining Ranges</a></h2>
     894      <p id="rfc.section.4.5.p.1">A response might transfer only a subrange of a representation if the connection closed prematurely or if the request used
    900895         one or more Range specifications. After several such transfers, a client might have received several ranges of the same representation.
    901896         These ranges can only be safely combined if they all have in common the same strong validator, where "strong validator" is
    902897         defined to be either an entity-tag that is not marked as weak (<a href="p4-conditional.html#header.etag" title="ETag">Section 2.3</a> of <a href="#Part4" id="rfc.xref.Part4.4"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests">[Part4]</cite></a>) or, if no entity-tag is provided, a <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> value that is strong in the sense defined by <a href="p4-conditional.html#lastmod.comparison" title="Comparison">Section 2.2.2</a> of <a href="#Part4" id="rfc.xref.Part4.5"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests">[Part4]</cite></a>.
    903898      </p>
    904       <p id="rfc.section.5.3.p.2">When a client receives an incomplete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response or a <a href="#status.206" class="smpl">206 (Partial Content)</a> response, and already has one or more partial responses for the same method and effective request URI that have the same strong
     899      <p id="rfc.section.4.5.p.2">When a client receives an incomplete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response or a <a href="#status.206" class="smpl">206 (Partial Content)</a> response, and already has one or more partial responses for the same method and effective request URI that have the same strong
    905900         validator as present in the new response, the recipient <em class="bcp14">MAY</em> combine some or all of those responses into a set of continuous ranges. A client <em class="bcp14">MUST NOT</em> combine responses that differ in the strong validator or that do not have a strong validator.
    906901      </p>
    907       <p id="rfc.section.5.3.p.3">If the new response is an incomplete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response, then the header fields of that new response are used for any combined response and replace those of the matching
     902      <p id="rfc.section.4.5.p.3">If the new response is an incomplete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response, then the header fields of that new response are used for any combined response and replace those of the matching
    908903         stored responses.
    909904      </p>
    910       <p id="rfc.section.5.3.p.4">If the new response is a <a href="#status.206" class="smpl">206 (Partial Content)</a> response and at least one of the matching stored responses is a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a>, then the combined response header fields consist of the most recent 200 response's header fields. If all of the matching
     905      <p id="rfc.section.4.5.p.4">If the new response is a <a href="#status.206" class="smpl">206 (Partial Content)</a> response and at least one of the matching stored responses is a <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a>, then the combined response header fields consist of the most recent 200 response's header fields. If all of the matching
    911906         stored responses are 206 responses, then the stored response with the most recent header fields is used as the source of header
    912907         fields for the combined response, except that the client <em class="bcp14">MUST</em> use other header fields provided in the new response, aside from <a href="#header.content-range" class="smpl">Content-Range</a>, to replace all instances of the corresponding header fields in the stored response.
    913908      </p>
    914       <p id="rfc.section.5.3.p.5">The combined response message body consists of the union of partial content ranges in the new response and each of the selected
     909      <p id="rfc.section.4.5.p.5">The combined response message body consists of the union of partial content ranges in the new response and each of the selected
    915910         responses. If the union consists of the entire range of the representation, then the client <em class="bcp14">MUST</em> record the combined response as if it were a complete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response, including a <a href="p1-messaging.html#header.content-length" class="smpl">Content-Length</a> header field that reflects the complete length. Otherwise, the client <em class="bcp14">MUST</em> record the set of continuous ranges as one of the following: an incomplete <a href="p2-semantics.html#status.200" class="smpl">200 (OK)</a> response if the combined response is a prefix of the representation, a single <a href="#status.206" class="smpl">206 (Partial Content)</a> response containing a multipart/byteranges body, or multiple <a href="#status.206" class="smpl">206 (Partial Content)</a> responses, each with one continuous range that is indicated by a <a href="#header.content-range" class="smpl">Content-Range</a> header field.
    916911      </p>
    917       <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
    918       <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="range.unit.registry" href="#range.unit.registry">Range Unit Registry</a></h2>
    919       <p id="rfc.section.6.1.p.1">The HTTP Range Unit Registry defines the name space for the range unit names and refers to their corresponding specifications.
     912      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
     913      <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="range.unit.registry" href="#range.unit.registry">Range Unit Registry</a></h2>
     914      <p id="rfc.section.5.1.p.1">The HTTP Range Unit Registry defines the name space for the range unit names and refers to their corresponding specifications.
    920915         The registry is maintained at &lt;<a href="http://www.iana.org/assignments/http-range-specifiers">http://www.iana.org/assignments/http-range-specifiers</a>&gt;.
    921916      </p>
    922       <h3 id="rfc.section.6.1.1"><a href="#rfc.section.6.1.1">6.1.1</a>&nbsp;<a id="range.unit.registry.procedure" href="#range.unit.registry.procedure">Procedure</a></h3>
    923       <p id="rfc.section.6.1.1.p.1">Registration of an HTTP Range Unit <em class="bcp14">MUST</em> include the following fields:
     917      <h3 id="rfc.section.5.1.1"><a href="#rfc.section.5.1.1">5.1.1</a>&nbsp;<a id="range.unit.registry.procedure" href="#range.unit.registry.procedure">Procedure</a></h3>
     918      <p id="rfc.section.5.1.1.p.1">Registration of an HTTP Range Unit <em class="bcp14">MUST</em> include the following fields:
    924919      </p>
    925920      <ul>
    … …  
    928923         <li>Pointer to specification text</li>
    929924      </ul>
    930       <p id="rfc.section.6.1.1.p.2">Values to be added to this name space require IETF Review (see <a href="#RFC5226" id="rfc.xref.RFC5226.1"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>).
    931       </p>
    932       <h3 id="rfc.section.6.1.2"><a href="#rfc.section.6.1.2">6.1.2</a>&nbsp;<a id="range.unit.registration" href="#range.unit.registration">Registrations</a></h3>
    933       <p id="rfc.section.6.1.2.p.1">The initial HTTP Range Unit Registry shall contain the registrations below:</p>
     925      <p id="rfc.section.5.1.1.p.2">Values to be added to this name space require IETF Review (see <a href="#RFC5226" id="rfc.xref.RFC5226.1"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>).
     926      </p>
     927      <h3 id="rfc.section.5.1.2"><a href="#rfc.section.5.1.2">5.1.2</a>&nbsp;<a id="range.unit.registration" href="#range.unit.registration">Registrations</a></h3>
     928      <p id="rfc.section.5.1.2.p.1">The initial HTTP Range Unit Registry shall contain the registrations below:</p>
    934929      <div id="rfc.table.1">
    935930         <div id="iana.range.units.table"></div>
    … …  
    956951         </table>
    957952      </div>
    958       <p id="rfc.section.6.1.2.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
    959       <h2 id="rfc.section.6.2"><a href="#rfc.section.6.2">6.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registration</a></h2>
    960       <p id="rfc.section.6.2.p.1">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
     953      <p id="rfc.section.5.1.2.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
     954      <h2 id="rfc.section.5.2"><a href="#rfc.section.5.2">5.2</a>&nbsp;<a id="status.code.registration" href="#status.code.registration">Status Code Registration</a></h2>
     955      <p id="rfc.section.5.2.p.1">The HTTP Status Code Registry located at &lt;<a href="http://www.iana.org/assignments/http-status-codes">http://www.iana.org/assignments/http-status-codes</a>&gt; shall be updated with the registrations below:
    961956      </p>
    962957      <div id="rfc.table.2">
    … …  
    974969                  <td class="left">206</td>
    975970                  <td class="left">Partial Content</td>
    976                   <td class="left"> <a href="#status.206" id="rfc.xref.status.206.1" title="206 Partial Content">Section&nbsp;4.1</a>
     971                  <td class="left"> <a href="#status.206" id="rfc.xref.status.206.1" title="206 Partial Content">Section&nbsp;4.2</a>
    977972                  </td>
    978973               </tr>
    … …  
    980975                  <td class="left">416</td>
    981976                  <td class="left">Range Not Satisfiable</td>
    982                   <td class="left"> <a href="#status.416" id="rfc.xref.status.416.1" title="416 Range Not Satisfiable">Section&nbsp;4.2</a>
     977                  <td class="left"> <a href="#status.416" id="rfc.xref.status.416.1" title="416 Range Not Satisfiable">Section&nbsp;4.3</a>
    983978                  </td>
    984979               </tr>
    … …  
    986981         </table>
    987982      </div>
    988       <h2 id="rfc.section.6.3"><a href="#rfc.section.6.3">6.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
    989       <p id="rfc.section.6.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#BCP90" id="rfc.xref.BCP90.1"><cite title="Registration Procedures for Message Header Fields">[BCP90]</cite></a>):
     983      <h2 id="rfc.section.5.3"><a href="#rfc.section.5.3">5.3</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
     984      <p id="rfc.section.5.3.p.1">The Message Header Field Registry located at &lt;<a href="http://www.iana.org/assignments/message-headers/message-header-index.html">http://www.iana.org/assignments/message-headers/message-header-index.html</a>&gt; shall be updated with the permanent registrations below (see <a href="#BCP90" id="rfc.xref.BCP90.1"><cite title="Registration Procedures for Message Header Fields">[BCP90]</cite></a>):
    990985      </p>
    991986      <div id="rfc.table.3">
    … …  
    10121007                  <td class="left">http</td>
    10131008                  <td class="left">standard</td>
    1014                   <td class="left"> <a href="#header.content-range" id="rfc.xref.header.content-range.4" title="Content-Range">Section&nbsp;5.2</a>
     1009                  <td class="left"> <a href="#header.content-range" id="rfc.xref.header.content-range.4" title="Content-Range">Section&nbsp;4.4</a>
    10151010                  </td>
    10161011               </tr>
    … …  
    10321027         </table>
    10331028      </div>
    1034       <p id="rfc.section.6.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
    1035       <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
    1036       <p id="rfc.section.7.p.1">This section is meant to inform developers, information providers, and users of known security concerns specific to the HTTP/1.1
     1029      <p id="rfc.section.5.3.p.2">The change controller is: "IETF (iesg@ietf.org) - Internet Engineering Task Force".</p>
     1030      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
     1031      <p id="rfc.section.6.p.1">This section is meant to inform developers, information providers, and users of known security concerns specific to the HTTP/1.1
    10371032         range request mechanisms. More general security considerations are addressed in HTTP messaging <a href="#Part1" id="rfc.xref.Part1.3"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing">[Part1]</cite></a> and semantics <a href="#Part2" id="rfc.xref.Part2.1"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content">[Part2]</cite></a>.
    10381033      </p>
    1039       <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="overlapping.ranges" href="#overlapping.ranges">Overlapping Ranges</a></h2>
    1040       <p id="rfc.section.7.1.p.1">Range requests containing overlapping ranges can lead to a situation where the server is sending far more data than the size
     1034      <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="overlapping.ranges" href="#overlapping.ranges">Overlapping Ranges</a></h2>
     1035      <p id="rfc.section.6.1.p.1">Range requests containing overlapping ranges can lead to a situation where the server is sending far more data than the size
    10411036         of the complete resource representation.
    10421037      </p>
    1043       <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
    1044       <p id="rfc.section.8.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.4"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing">[Part1]</cite></a>.
    1045       </p>
    1046       <h1 id="rfc.references"><a id="rfc.section.9" href="#rfc.section.9">9.</a> References
     1038      <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="acks" href="#acks">Acknowledgments</a></h1>
     1039      <p id="rfc.section.7.p.1">See <a href="p1-messaging.html#acks" title="Acknowledgments">Section 9</a> of <a href="#Part1" id="rfc.xref.Part1.4"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing">[Part1]</cite></a>.
     1040      </p>
     1041      <h1 id="rfc.references"><a id="rfc.section.8" href="#rfc.section.8">8.</a> References
    10471042      </h1>
    1048       <h2 id="rfc.references.1"><a href="#rfc.section.9.1" id="rfc.section.9.1">9.1</a> Normative References
     1043      <h2 id="rfc.references.1"><a href="#rfc.section.8.1" id="rfc.section.8.1">8.1</a> Normative References
    10491044      </h2>
    10501045      <table>             
    … …  
    10851080         </tr>
    10861081      </table>
    1087       <h2 id="rfc.references.2"><a href="#rfc.section.9.2" id="rfc.section.9.2">9.2</a> Informative References
     1082      <h2 id="rfc.references.2"><a href="#rfc.section.8.2" id="rfc.section.8.2">8.2</a> Informative References
    10881083      </h2>
    10891084      <table>       
    … …  
    12201215      </ol>
    12211216      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="changes.from.rfc.2616" href="#changes.from.rfc.2616">Changes from RFC 2616</a></h1>
    1222       <p id="rfc.section.B.p.1">A weak validator cannot be used in a <a href="#status.206" class="smpl">206</a> response. (<a href="#status.206" id="rfc.xref.status.206.2" title="206 Partial Content">Section&nbsp;4.1</a>)
    1223       </p>
    1224       <p id="rfc.section.B.p.2">The Content-Range header field only has meaning when the status code explicitly defines its use. (<a href="#header.content-range" id="rfc.xref.header.content-range.5" title="Content-Range">Section&nbsp;5.2</a>)
     1217      <p id="rfc.section.B.p.1">A weak validator cannot be used in a <a href="#status.206" class="smpl">206</a> response. (<a href="#status.206" id="rfc.xref.status.206.2" title="206 Partial Content">Section&nbsp;4.2</a>)
     1218      </p>
     1219      <p id="rfc.section.B.p.2">The Content-Range header field only has meaning when the status code explicitly defines its use. (<a href="#header.content-range" id="rfc.xref.header.content-range.5" title="Content-Range">Section&nbsp;4.4</a>)
    12251220      </p>
    12261221      <p id="rfc.section.B.p.3">Servers are given more leeway in how they respond to a range request, in order to mitigate abuse by malicious (or just greedy)
    … …  
    12291224      <p id="rfc.section.B.p.4">multipart/byteranges can consist of a single part. (<a href="#internet.media.type.multipart.byteranges" title="Internet Media Type multipart/byteranges">Appendix&nbsp;A</a>)
    12301225      </p>
    1231       <p id="rfc.section.B.p.5">This specification introduces a Range Specifier Registry. (<a href="#range.unit.registry" title="Range Unit Registry">Section&nbsp;6.1</a>)
     1226      <p id="rfc.section.B.p.5">This specification introduces a Range Specifier Registry. (<a href="#range.unit.registry" title="Range Unit Registry">Section&nbsp;5.1</a>)
    12321227      </p>
    12331228      <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="imported.abnf" href="#imported.abnf">Imported ABNF</a></h1>
    … …  
    13241319         <ul class="ind">
    13251320            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    1326                   <li>206 Partial Content (status code)&nbsp;&nbsp;<a href="#rfc.iref.18"><b>4.1</b></a>, <a href="#rfc.xref.status.206.1">6.2</a>, <a href="#rfc.xref.status.206.2">B</a></li>
     1321                  <li>206 Partial Content (status code)&nbsp;&nbsp;<a href="#rfc.iref.18"><b>4.2</b></a>, <a href="#rfc.xref.status.206.1">5.2</a>, <a href="#rfc.xref.status.206.2">B</a></li>
    13271322               </ul>
    13281323            </li>
    13291324            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
    1330                   <li>416 Range Not Satisfiable (status code)&nbsp;&nbsp;<a href="#rfc.iref.18"><b>4.2</b></a>, <a href="#rfc.xref.status.416.1">6.2</a></li>
     1325                  <li>416 Range Not Satisfiable (status code)&nbsp;&nbsp;<a href="#rfc.iref.18"><b>4.3</b></a>, <a href="#rfc.xref.status.416.1">5.2</a></li>
    13311326               </ul>
    13321327            </li>
    13331328            <li><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul>
    1334                   <li>Accept-Ranges header field&nbsp;&nbsp;<a href="#rfc.iref.a.1"><b>2.3</b></a>, <a href="#rfc.xref.header.accept-ranges.1">6.1.2</a>, <a href="#rfc.xref.header.accept-ranges.2">6.3</a></li>
     1329                  <li>Accept-Ranges header field&nbsp;&nbsp;<a href="#rfc.iref.a.1"><b>2.3</b></a>, <a href="#rfc.xref.header.accept-ranges.1">5.1.2</a>, <a href="#rfc.xref.header.accept-ranges.2">5.3</a></li>
    13351330               </ul>
    13361331            </li>
    13371332            <li><a id="rfc.index.B" href="#rfc.index.B"><b>B</b></a><ul>
    1338                   <li><em>BCP13</em>&nbsp;&nbsp;<a href="#BCP13"><b>9.2</b></a>, <a href="#rfc.xref.BCP13.1">A</a></li>
    1339                   <li><em>BCP90</em>&nbsp;&nbsp;<a href="#rfc.xref.BCP90.1">6.3</a>, <a href="#BCP90"><b>9.2</b></a></li>
     1333                  <li><em>BCP13</em>&nbsp;&nbsp;<a href="#BCP13"><b>8.2</b></a>, <a href="#rfc.xref.BCP13.1">A</a></li>
     1334                  <li><em>BCP90</em>&nbsp;&nbsp;<a href="#rfc.xref.BCP90.1">5.3</a>, <a href="#BCP90"><b>8.2</b></a></li>
    13401335               </ul>
    13411336            </li>
    13421337            <li><a id="rfc.index.C" href="#rfc.index.C"><b>C</b></a><ul>
    1343                   <li>Content-Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-range.1">2</a>, <a href="#rfc.xref.header.content-range.2">4.1</a>, <a href="#rfc.xref.header.content-range.3">4.2</a>, <a href="#rfc.iref.c.1"><b>5.2</b></a>, <a href="#rfc.xref.header.content-range.4">6.3</a>, <a href="#rfc.xref.header.content-range.5">B</a></li>
     1338                  <li>Content-Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.content-range.1">2</a>, <a href="#rfc.xref.header.content-range.2">4.2</a>, <a href="#rfc.xref.header.content-range.3">4.3</a>, <a href="#rfc.iref.c.1"><b>4.4</b></a>, <a href="#rfc.xref.header.content-range.4">5.3</a>, <a href="#rfc.xref.header.content-range.5">B</a></li>
    13441339               </ul>
    13451340            </li>
    … …  
    13491344                        <li><tt>Accept-Ranges</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>2.3</b></a></li>
    13501345                        <li><tt>acceptable-ranges</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>2.3</b></a></li>
    1351                         <li><tt>byte-content-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>5.2</b></a></li>
    1352                         <li><tt>byte-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>5.2</b></a></li>
    1353                         <li><tt>byte-range-resp</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>5.2</b></a></li>
     1346                        <li><tt>byte-content-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>4.4</b></a></li>
     1347                        <li><tt>byte-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>4.4</b></a></li>
     1348                        <li><tt>byte-range-resp</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>4.4</b></a></li>
    13541349                        <li><tt>byte-range-set</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>2.1</b></a></li>
    13551350                        <li><tt>byte-range-spec</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>2.1</b></a></li>
    13561351                        <li><tt>byte-ranges-specifier</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>2.1</b></a></li>
    13571352                        <li><tt>bytes-unit</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>2</b></a></li>
    1358                         <li><tt>complete-length</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>5.2</b></a></li>
    1359                         <li><tt>Content-Range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>5.2</b></a></li>
     1353                        <li><tt>complete-length</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>4.4</b></a></li>
     1354                        <li><tt>Content-Range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>4.4</b></a></li>
    13601355                        <li><tt>first-byte-pos</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>2.1</b></a></li>
    13611356                        <li><tt>If-Range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>3.2</b></a></li>
    13621357                        <li><tt>last-byte-pos</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>2.1</b></a></li>
    1363                         <li><tt>other-content-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>5.2</b></a></li>
    1364                         <li><tt>other-range-resp</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>5.2</b></a></li>
     1358                        <li><tt>other-content-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>4.4</b></a></li>
     1359                        <li><tt>other-range-resp</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>4.4</b></a></li>
    13651360                        <li><tt>other-range-unit</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>2</b></a></li>
    13661361                        <li><tt>Range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>3.1</b></a></li>
    … …  
    13691364                        <li><tt>suffix-byte-range-spec</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>2.1</b></a></li>
    13701365                        <li><tt>suffix-length</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>2.1</b></a></li>
    1371                         <li><tt>unsatisfied-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>5.2</b></a></li>
     1366                        <li><tt>unsatisfied-range</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>4.4</b></a></li>
    13721367                     </ul>
    13731368                  </li>
    … …  
    13751370            </li>
    13761371            <li><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul>
    1377                   <li>If-Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.if-range.1">3.1</a>, <a href="#rfc.iref.i.1"><b>3.2</b></a>, <a href="#rfc.xref.header.if-range.2">4.1</a>, <a href="#rfc.xref.header.if-range.3">4.2</a>, <a href="#rfc.xref.header.if-range.4">6.3</a></li>
     1372                  <li>If-Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.if-range.1">3.1</a>, <a href="#rfc.iref.i.1"><b>3.2</b></a>, <a href="#rfc.xref.header.if-range.2">4.2</a>, <a href="#rfc.xref.header.if-range.3">4.3</a>, <a href="#rfc.xref.header.if-range.4">5.3</a></li>
    13781373               </ul>
    13791374            </li>
    … …  
    13901385            </li>
    13911386            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
    1392                   <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1.1</a>, <a href="#rfc.xref.Part1.2">1.2</a>, <a href="#rfc.xref.Part1.3">7</a>, <a href="#rfc.xref.Part1.4">8</a>, <a href="#Part1"><b>9.1</b></a>, <a href="#rfc.xref.Part1.5">C</a>, <a href="#rfc.xref.Part1.6">C</a>, <a href="#rfc.xref.Part1.7">C</a><ul>
     1387                  <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1.1</a>, <a href="#rfc.xref.Part1.2">1.2</a>, <a href="#rfc.xref.Part1.3">6</a>, <a href="#rfc.xref.Part1.4">7</a>, <a href="#Part1"><b>8.1</b></a>, <a href="#rfc.xref.Part1.5">C</a>, <a href="#rfc.xref.Part1.6">C</a>, <a href="#rfc.xref.Part1.7">C</a><ul>
    13931388                        <li><em>Section 1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.2">1.2</a></li>
    13941389                        <li><em>Section 2.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">1.1</a></li>
    13951390                        <li><em>Section 3.2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.6">C</a></li>
    13961391                        <li><em>Section 3.2.6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.7">C</a></li>
    1397                         <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.4">8</a></li>
     1392                        <li><em>Section 9</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.4">7</a></li>
    13981393                     </ul>
    13991394                  </li>
    1400                   <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">7</a>, <a href="#Part2"><b>9.1</b></a>, <a href="#rfc.xref.Part2.2">C</a><ul>
     1395                  <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">6</a>, <a href="#Part2"><b>8.1</b></a>, <a href="#rfc.xref.Part2.2">C</a><ul>
    14011396                        <li><em>Section 7.1.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.2">C</a></li>
    14021397                     </ul>
    14031398                  </li>
    1404                   <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">3.1</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">5.3</a>, <a href="#rfc.xref.Part4.5">5.3</a>, <a href="#Part4"><b>9.1</b></a>, <a href="#rfc.xref.Part4.6">C</a><ul>
    1405                         <li><em>Section 2.2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.5">5.3</a></li>
    1406                         <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.4">5.3</a>, <a href="#rfc.xref.Part4.6">C</a></li>
     1399                  <li><em>Part4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.1">3.1</a>, <a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.4">4.5</a>, <a href="#rfc.xref.Part4.5">4.5</a>, <a href="#Part4"><b>8.1</b></a>, <a href="#rfc.xref.Part4.6">C</a><ul>
     1400                        <li><em>Section 2.2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.2">3.2</a>, <a href="#rfc.xref.Part4.3">3.2</a>, <a href="#rfc.xref.Part4.5">4.5</a></li>
     1401                        <li><em>Section 2.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part4.4">4.5</a>, <a href="#rfc.xref.Part4.6">C</a></li>
    14071402                     </ul>
    14081403                  </li>
    1409                   <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">4.1</a>, <a href="#Part6"><b>9.1</b></a><ul>
    1410                         <li><em>Section 4.1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">4.1</a></li>
     1404                  <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">4.2</a>, <a href="#Part6"><b>8.1</b></a><ul>
     1405                        <li><em>Section 4.1.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">4.2</a></li>
    14111406                     </ul>
    14121407                  </li>
    … …  
    14141409            </li>
    14151410            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
    1416                   <li>Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.range.1">2</a>, <a href="#rfc.iref.r.1"><b>3.1</b></a>, <a href="#rfc.xref.header.range.2">4.1</a>, <a href="#rfc.xref.header.range.3">4.2</a>, <a href="#rfc.xref.header.range.4">6.3</a></li>
    1417                   <li><em>RFC2046</em>&nbsp;&nbsp;<a href="#RFC2046"><b>9.1</b></a>, <a href="#rfc.xref.RFC2046.1">A</a>, <a href="#rfc.xref.RFC2046.2">A</a><ul>
     1411                  <li>Range header field&nbsp;&nbsp;<a href="#rfc.xref.header.range.1">2</a>, <a href="#rfc.iref.r.1"><b>3.1</b></a>, <a href="#rfc.xref.header.range.2">4.2</a>, <a href="#rfc.xref.header.range.3">4.3</a>, <a href="#rfc.xref.header.range.4">5.3</a></li>
     1412                  <li><em>RFC2046</em>&nbsp;&nbsp;<a href="#RFC2046"><b>8.1</b></a>, <a href="#rfc.xref.RFC2046.1">A</a>, <a href="#rfc.xref.RFC2046.2">A</a><ul>
    14181413                        <li><em>Section 5.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2046.1">A</a></li>
    14191414                     </ul>
    14201415                  </li>
    1421                   <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>9.1</b></a></li>
    1422                   <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#RFC2616"><b>9.2</b></a></li>
    1423                   <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">6.1.1</a>, <a href="#RFC5226"><b>9.2</b></a><ul>
    1424                         <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">6.1.1</a></li>
     1416                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>8.1</b></a></li>
     1417                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#RFC2616"><b>8.2</b></a></li>
     1418                  <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">5.1.1</a>, <a href="#RFC5226"><b>8.2</b></a><ul>
     1419                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">5.1.1</a></li>
    14251420                     </ul>
    14261421                  </li>
    1427                   <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">1.2</a>, <a href="#RFC5234"><b>9.1</b></a>, <a href="#rfc.xref.RFC5234.2">C</a><ul>
     1422                  <li><em>RFC5234</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.1">1.2</a>, <a href="#RFC5234"><b>8.1</b></a>, <a href="#rfc.xref.RFC5234.2">C</a><ul>
    14281423                        <li><em>Appendix B.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5234.2">C</a></li>
    14291424                     </ul>
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