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Timestamp:
Mar 28, 2012, 4:14:03 AM (8 years ago)
Author:
julian.reschke@…
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prune change logs

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  • draft-ietf-httpbis/latest/p6-cache.html

    r1604 r1624  
    463463  }
    464464  @bottom-center {
    465        content: "Expires September 22, 2012";
     465       content: "Expires September 29, 2012";
    466466  }
    467467  @bottom-right {
     
    505505      <meta name="dct.creator" content="Reschke, J. F.">
    506506      <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p6-cache-latest">
    507       <meta name="dct.issued" scheme="ISO8601" content="2012-03-21">
     507      <meta name="dct.issued" scheme="ISO8601" content="2012-03-28">
    508508      <meta name="dct.replaces" content="urn:ietf:rfc:2616">
    509509      <meta name="dct.abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypertext information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 6 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 6 defines requirements on HTTP caches and the associated header fields that control cache behavior or indicate cacheable response messages.">
     
    531531            </tr>
    532532            <tr>
    533                <td class="left">Expires: September 22, 2012</td>
     533               <td class="left">Expires: September 29, 2012</td>
    534534               <td class="right">M. Nottingham, Editor</td>
    535535            </tr>
     
    548548            <tr>
    549549               <td class="left"></td>
    550                <td class="right">March 21, 2012</td>
     550               <td class="right">March 28, 2012</td>
    551551            </tr>
    552552         </tbody>
     
    567567      <p>The current issues list is at &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/report/3">http://tools.ietf.org/wg/httpbis/trac/report/3</a>&gt; and related documents (including fancy diffs) can be found at &lt;<a href="http://tools.ietf.org/wg/httpbis/">http://tools.ietf.org/wg/httpbis/</a>&gt;.
    568568      </p> 
    569       <p>The changes in this draft are summarized in <a href="#changes.since.19" title="Since draft-ietf-httpbis-p6-cache-19">Appendix&nbsp;C.21</a>.
     569      <p>The changes in this draft are summarized in <a href="#changes.since.19" title="Since draft-ietf-httpbis-p6-cache-19">Appendix&nbsp;C.1</a>.
    570570      </p>
    571571      <h1><a id="rfc.status" href="#rfc.status">Status of This Memo</a></h1>
     
    578578         in progress”.
    579579      </p>
    580       <p>This Internet-Draft will expire on September 22, 2012.</p>
     580      <p>This Internet-Draft will expire on September 29, 2012.</p>
    581581      <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
    582582      <p>Copyright © 2012 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
     
    673673         <li>B.&nbsp;&nbsp;&nbsp;<a href="#collected.abnf">Collected ABNF</a></li>
    674674         <li>C.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul>
    675                <li>C.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.1">Since RFC 2616</a></li>
    676                <li>C.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.2">Since draft-ietf-httpbis-p6-cache-00</a></li>
    677                <li>C.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.C.3">Since draft-ietf-httpbis-p6-cache-01</a></li>
    678                <li>C.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p6-cache-02</a></li>
    679                <li>C.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p6-cache-03</a></li>
    680                <li>C.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p6-cache-04</a></li>
    681                <li>C.7&nbsp;&nbsp;&nbsp;<a href="#changes.since.05">Since draft-ietf-httpbis-p6-cache-05</a></li>
    682                <li>C.8&nbsp;&nbsp;&nbsp;<a href="#changes.since.06">Since draft-ietf-httpbis-p6-cache-06</a></li>
    683                <li>C.9&nbsp;&nbsp;&nbsp;<a href="#changes.since.07">Since draft-ietf-httpbis-p6-cache-07</a></li>
    684                <li>C.10&nbsp;&nbsp;&nbsp;<a href="#changes.since.08">Since draft-ietf-httpbis-p6-cache-08</a></li>
    685                <li>C.11&nbsp;&nbsp;&nbsp;<a href="#changes.since.09">Since draft-ietf-httpbis-p6-cache-09</a></li>
    686                <li>C.12&nbsp;&nbsp;&nbsp;<a href="#changes.since.10">Since draft-ietf-httpbis-p6-cache-10</a></li>
    687                <li>C.13&nbsp;&nbsp;&nbsp;<a href="#changes.since.11">Since draft-ietf-httpbis-p6-cache-11</a></li>
    688                <li>C.14&nbsp;&nbsp;&nbsp;<a href="#changes.since.12">Since draft-ietf-httpbis-p6-cache-12</a></li>
    689                <li>C.15&nbsp;&nbsp;&nbsp;<a href="#changes.since.13">Since draft-ietf-httpbis-p6-cache-13</a></li>
    690                <li>C.16&nbsp;&nbsp;&nbsp;<a href="#changes.since.14">Since draft-ietf-httpbis-p6-cache-14</a></li>
    691                <li>C.17&nbsp;&nbsp;&nbsp;<a href="#changes.since.15">Since draft-ietf-httpbis-p6-cache-15</a></li>
    692                <li>C.18&nbsp;&nbsp;&nbsp;<a href="#changes.since.16">Since draft-ietf-httpbis-p6-cache-16</a></li>
    693                <li>C.19&nbsp;&nbsp;&nbsp;<a href="#changes.since.17">Since draft-ietf-httpbis-p6-cache-17</a></li>
    694                <li>C.20&nbsp;&nbsp;&nbsp;<a href="#changes.since.18">Since draft-ietf-httpbis-p6-cache-18</a></li>
    695                <li>C.21&nbsp;&nbsp;&nbsp;<a href="#changes.since.19">Since draft-ietf-httpbis-p6-cache-19</a></li>
     675               <li>C.1&nbsp;&nbsp;&nbsp;<a href="#changes.since.19">Since draft-ietf-httpbis-p6-cache-19</a></li>
    696676            </ul>
    697677         </li>
     
    825805      <p id="rfc.section.1.4.2.p.1">The ABNF rules below are defined in other parts:</p>
    826806      <div id="rfc.figure.u.2"></div><pre class="inline">  <a href="#abnf.dependencies" class="smpl">field-name</a>    = &lt;field-name, 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#header.fields" title="Header Fields">Section 3.2</a>&gt;
    827   <a href="#abnf.dependencies" class="smpl">HTTP-date</a>     = &lt;HTTP-date, 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#http.date" title="Date/Time Formats">Section 8</a>&gt;
     807  <a href="#abnf.dependencies" class="smpl">HTTP-date</a>     = &lt;HTTP-date, 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#http.date" title="Date/Time Formats">Section 6.1</a>&gt;
    828808  <a href="#abnf.dependencies" class="smpl">port</a>          = &lt;port, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.7</a>&gt;
    829809  <a href="#abnf.dependencies" class="smpl">pseudonym</a>     = &lt;pseudonym, 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.via" title="Via">Section 6.2</a>&gt;
     
    924904      <p id="rfc.section.2.2.p.3">When a stored response is used to satisfy a request without validation, a cache <em class="bcp14">MUST</em> include a single Age header field (<a href="#header.age" id="rfc.xref.header.age.1" title="Age">Section&nbsp;3.1</a>) in the response with a value equal to the stored response's current_age; see <a href="#age.calculations" title="Calculating Age">Section&nbsp;2.3.2</a>.
    925905      </p>
    926       <p id="rfc.section.2.2.p.4">A cache <em class="bcp14">MUST</em> write through requests with methods that are unsafe (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 6.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) to the origin server; i.e., a cache is not allowed to generate a reply to such a request before having forwarded the request
     906      <p id="rfc.section.2.2.p.4">A cache <em class="bcp14">MUST</em> write through requests with methods that are unsafe (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 2.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.3"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) to the origin server; i.e., a cache is not allowed to generate a reply to such a request before having forwarded the request
    927907         and having received a corresponding response.
    928908      </p>
     
    975955      <h4 id="rfc.section.2.3.1.1"><a href="#rfc.section.2.3.1.1">2.3.1.1</a>&nbsp;<a id="heuristic.freshness" href="#heuristic.freshness">Calculating Heuristic Freshness</a></h4>
    976956      <p id="rfc.section.2.3.1.1.p.1">If no explicit expiration time is present in a stored response that has a status code whose definition allows heuristic freshness
    977          to be used (including the following in <a href="p2-semantics.html#status.codes" title="Status Code Definitions">Section 7</a> of <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>: 200, 203, 206, 300, 301 and 410), a cache <em class="bcp14">MAY</em> calculate a heuristic expiration time. A cache <em class="bcp14">MUST NOT</em> use heuristics to determine freshness for responses with status codes that do not explicitly allow it.
     957         to be used (including the following in <a href="p2-semantics.html#status.codes" title="ERROR: Anchor 'status.codes' not found in p2-semantics.xml.">Appendix ERROR: Anchor 'status.codes' in Part2 not found in source file 'p2-semantics.xml'.</a> of <a href="#Part2" id="rfc.xref.Part2.4"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>: 200, 203, 206, 300, 301 and 410), a cache <em class="bcp14">MAY</em> calculate a heuristic expiration time. A cache <em class="bcp14">MUST NOT</em> use heuristics to determine freshness for responses with status codes that do not explicitly allow it.
    978958      </p>
    979959      <p id="rfc.section.2.3.1.1.p.2">When a heuristic is used to calculate freshness lifetime, a cache <em class="bcp14">SHOULD</em> attach a Warning header field with a 113 warn-code to the response if its current_age is more than 24 hours and such a warning
     
    1007987         <li>HTTP/1.1 requires origin servers to send a Date header field, if possible, with every response, giving the time at which the
    1008988            response was generated. The term "date_value" denotes the value of the Date header field, in a form appropriate for arithmetic
    1009             operations. See <a href="p2-semantics.html#header.date" title="Date">Section 10.2</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a> for the definition of the Date header field, and for requirements regarding responses without it.
     989            operations. See <a href="p2-semantics.html#header.date" title="Date">Section 7.2</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a> for the definition of the Date header field, and for requirements regarding responses without it.
    1010990         </li>
    1011991      </ul>
     
    11541134      </ul>
    11551135      <h2 id="rfc.section.2.6"><a href="#rfc.section.2.6">2.6</a>&nbsp;<a id="invalidation.after.updates.or.deletions" href="#invalidation.after.updates.or.deletions">Request Methods that Invalidate</a></h2>
    1156       <p id="rfc.section.2.6.p.1">Because unsafe request methods (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 6.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) such as PUT, POST or DELETE have the potential for changing state on the origin server, intervening caches can use them
     1136      <p id="rfc.section.2.6.p.1">Because unsafe request methods (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 2.1.1</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>) such as PUT, POST or DELETE have the potential for changing state on the origin server, intervening caches can use them
    11571137         to keep their contents up-to-date.
    11581138      </p>
     
    14691449         that time.
    14701450      </p>
    1471       <p id="rfc.section.3.3.p.3">The field-value is an absolute date and time as defined by HTTP-date in <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 8</a> of <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>; a sender <em class="bcp14">MUST</em> use the rfc1123-date format.
     1451      <p id="rfc.section.3.3.p.3">The field-value is an absolute date and time as defined by HTTP-date in <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 6.1</a> of <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>; a sender <em class="bcp14">MUST</em> use the rfc1123-date format.
    14721452      </p>
    14731453      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.7"></span>  <a href="#header.expires" class="smpl">Expires</a> = <a href="#abnf.dependencies" class="smpl">HTTP-date</a>
     
    20392019; Warning defined but not used
    20402020</pre><h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
    2041       <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a>&nbsp;Since RFC 2616
    2042       </h2>
    2043       <p id="rfc.section.C.1.p.1">Extracted relevant partitions from <a href="#RFC2616" id="rfc.xref.RFC2616.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>.
    2044       </p>
    2045       <h2 id="rfc.section.C.2"><a href="#rfc.section.C.2">C.2</a>&nbsp;Since draft-ietf-httpbis-p6-cache-00
    2046       </h2>
    2047       <p id="rfc.section.C.2.p.1">Closed issues: </p>
    2048       <ul>
    2049          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/9">http://tools.ietf.org/wg/httpbis/trac/ticket/9</a>&gt;: "Trailer" (&lt;<a href="http://purl.org/NET/http-errata#trailer-hop">http://purl.org/NET/http-errata#trailer-hop</a>&gt;)
    2050          </li>
    2051          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/12">http://tools.ietf.org/wg/httpbis/trac/ticket/12</a>&gt;: "Invalidation after Update or Delete" (&lt;<a href="http://purl.org/NET/http-errata#invalidupd">http://purl.org/NET/http-errata#invalidupd</a>&gt;)
    2052          </li>
    2053          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/35">http://tools.ietf.org/wg/httpbis/trac/ticket/35</a>&gt;: "Normative and Informative references"
    2054          </li>
    2055          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/48">http://tools.ietf.org/wg/httpbis/trac/ticket/48</a>&gt;: "Date reference typo"
    2056          </li>
    2057          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/49">http://tools.ietf.org/wg/httpbis/trac/ticket/49</a>&gt;: "Connection header text"
    2058          </li>
    2059          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/65">http://tools.ietf.org/wg/httpbis/trac/ticket/65</a>&gt;: "Informative references"
    2060          </li>
    2061          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/66">http://tools.ietf.org/wg/httpbis/trac/ticket/66</a>&gt;: "ISO-8859-1 Reference"
    2062          </li>
    2063          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/86">http://tools.ietf.org/wg/httpbis/trac/ticket/86</a>&gt;: "Normative up-to-date references"
    2064          </li>
    2065          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/87">http://tools.ietf.org/wg/httpbis/trac/ticket/87</a>&gt;: "typo in 13.2.2"
    2066          </li>
    2067       </ul>
    2068       <p id="rfc.section.C.2.p.2">Other changes: </p>
    2069       <ul>
    2070          <li>Use names of RFC4234 core rules DQUOTE and HTAB (work in progress on &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;)
    2071          </li>
    2072       </ul>
    2073       <h2 id="rfc.section.C.3"><a href="#rfc.section.C.3">C.3</a>&nbsp;Since draft-ietf-httpbis-p6-cache-01
    2074       </h2>
    2075       <p id="rfc.section.C.3.p.1">Closed issues: </p>
    2076       <ul>
    2077          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/82">http://tools.ietf.org/wg/httpbis/trac/ticket/82</a>&gt;: "rel_path not used"
    2078          </li>
    2079       </ul>
    2080       <p id="rfc.section.C.3.p.2">Other changes: </p>
    2081       <ul>
    2082          <li>Get rid of duplicate BNF rule names ("host" -&gt; "uri-host") (work in progress on &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;)
    2083          </li>
    2084          <li>Add explicit references to BNF syntax and rules imported from other parts of the specification.</li>
    2085       </ul>
    2086       <h2 id="rfc.section.C.4"><a href="#rfc.section.C.4">C.4</a>&nbsp;<a id="changes.since.02" href="#changes.since.02">Since draft-ietf-httpbis-p6-cache-02</a></h2>
    2087       <p id="rfc.section.C.4.p.1">Ongoing work on IANA Message Header Field Registration (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/40">http://tools.ietf.org/wg/httpbis/trac/ticket/40</a>&gt;):
    2088       </p>
    2089       <ul>
    2090          <li>Reference RFC 3984, and update header field registrations for header fields defined in this document.</li>
    2091       </ul>
    2092       <h2 id="rfc.section.C.5"><a href="#rfc.section.C.5">C.5</a>&nbsp;<a id="changes.since.03" href="#changes.since.03">Since draft-ietf-httpbis-p6-cache-03</a></h2>
    2093       <p id="rfc.section.C.5.p.1">Closed issues: </p>
    2094       <ul>
    2095          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/106">http://tools.ietf.org/wg/httpbis/trac/ticket/106</a>&gt;: "Vary header classification"
    2096          </li>
    2097       </ul>
    2098       <h2 id="rfc.section.C.6"><a href="#rfc.section.C.6">C.6</a>&nbsp;<a id="changes.since.04" href="#changes.since.04">Since draft-ietf-httpbis-p6-cache-04</a></h2>
    2099       <p id="rfc.section.C.6.p.1">Ongoing work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    2100       </p>
    2101       <ul>
    2102          <li>Use "/" instead of "|" for alternatives.</li>
    2103          <li>Introduce new ABNF rules for "bad" whitespace ("BWS"), optional whitespace ("OWS") and required whitespace ("RWS").</li>
    2104          <li>Rewrite ABNFs to spell out whitespace rules, factor out header field value format definitions.</li>
    2105       </ul>
    2106       <h2 id="rfc.section.C.7"><a href="#rfc.section.C.7">C.7</a>&nbsp;<a id="changes.since.05" href="#changes.since.05">Since draft-ietf-httpbis-p6-cache-05</a></h2>
    2107       <p id="rfc.section.C.7.p.1">This is a total rewrite of this part of the specification.</p>
    2108       <p id="rfc.section.C.7.p.2">Affected issues: </p>
    2109       <ul>
    2110          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/54">http://tools.ietf.org/wg/httpbis/trac/ticket/54</a>&gt;: "Definition of 1xx Warn-Codes"
    2111          </li>
    2112          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/60">http://tools.ietf.org/wg/httpbis/trac/ticket/60</a>&gt;: "Placement of 13.5.1 and 13.5.2"
    2113          </li>
    2114          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/138">http://tools.ietf.org/wg/httpbis/trac/ticket/138</a>&gt;: "The role of Warning and Semantic Transparency in Caching"
    2115          </li>
    2116          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/139">http://tools.ietf.org/wg/httpbis/trac/ticket/139</a>&gt;: "Methods and Caching"
    2117          </li>
    2118       </ul>
    2119       <p id="rfc.section.C.7.p.3">In addition: Final work on ABNF conversion (&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
    2120       </p>
    2121       <ul>
    2122          <li>Add appendix containing collected and expanded ABNF, reorganize ABNF introduction.</li>
    2123       </ul>
    2124       <h2 id="rfc.section.C.8"><a href="#rfc.section.C.8">C.8</a>&nbsp;<a id="changes.since.06" href="#changes.since.06">Since draft-ietf-httpbis-p6-cache-06</a></h2>
    2125       <p id="rfc.section.C.8.p.1">Closed issues: </p>
    2126       <ul>
    2127          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/161">http://tools.ietf.org/wg/httpbis/trac/ticket/161</a>&gt;: "base for numeric protocol elements"
    2128          </li>
    2129       </ul>
    2130       <p id="rfc.section.C.8.p.2">Affected issues: </p>
    2131       <ul>
    2132          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/37">http://tools.ietf.org/wg/httpbis/trac/ticket/37</a>&gt;: "Vary and non-existant headers"
    2133          </li>
    2134       </ul>
    2135       <h2 id="rfc.section.C.9"><a href="#rfc.section.C.9">C.9</a>&nbsp;<a id="changes.since.07" href="#changes.since.07">Since draft-ietf-httpbis-p6-cache-07</a></h2>
    2136       <p id="rfc.section.C.9.p.1">Closed issues: </p>
    2137       <ul>
    2138          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/54">http://tools.ietf.org/wg/httpbis/trac/ticket/54</a>&gt;: "Definition of 1xx Warn-Codes"
    2139          </li>
    2140          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/167">http://tools.ietf.org/wg/httpbis/trac/ticket/167</a>&gt;: "Content-Location on 304 responses"
    2141          </li>
    2142          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/169">http://tools.ietf.org/wg/httpbis/trac/ticket/169</a>&gt;: "private and no-cache CC directives with headers"
    2143          </li>
    2144          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/187">http://tools.ietf.org/wg/httpbis/trac/ticket/187</a>&gt;: "RFC2047 and warn-text"
    2145          </li>
    2146       </ul>
    2147       <h2 id="rfc.section.C.10"><a href="#rfc.section.C.10">C.10</a>&nbsp;<a id="changes.since.08" href="#changes.since.08">Since draft-ietf-httpbis-p6-cache-08</a></h2>
    2148       <p id="rfc.section.C.10.p.1">Closed issues: </p>
    2149       <ul>
    2150          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/147">http://tools.ietf.org/wg/httpbis/trac/ticket/147</a>&gt;: "serving negotiated responses from cache: header-specific canonicalization"
    2151          </li>
    2152          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/197">http://tools.ietf.org/wg/httpbis/trac/ticket/197</a>&gt;: "Effect of CC directives on history lists"
    2153          </li>
    2154          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/291">http://tools.ietf.org/wg/httpbis/trac/ticket/291</a>&gt;: "Cache Extensions can override no-store, etc."
    2155          </li>
    2156       </ul>
    2157       <p id="rfc.section.C.10.p.2">Affected issues: </p>
    2158       <ul>
    2159          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/199">http://tools.ietf.org/wg/httpbis/trac/ticket/199</a>&gt;: Status codes and caching
    2160          </li>
    2161       </ul>
    2162       <p id="rfc.section.C.10.p.3">Partly resolved issues: </p>
    2163       <ul>
    2164          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/60">http://tools.ietf.org/wg/httpbis/trac/ticket/60</a>&gt;: "Placement of 13.5.1 and 13.5.2"
    2165          </li>
    2166       </ul>
    2167       <h2 id="rfc.section.C.11"><a href="#rfc.section.C.11">C.11</a>&nbsp;<a id="changes.since.09" href="#changes.since.09">Since draft-ietf-httpbis-p6-cache-09</a></h2>
    2168       <p id="rfc.section.C.11.p.1">Closed issues: </p>
    2169       <ul>
    2170          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/29">http://tools.ietf.org/wg/httpbis/trac/ticket/29</a>&gt;: "Age calculation"
    2171          </li>
    2172          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/168">http://tools.ietf.org/wg/httpbis/trac/ticket/168</a>&gt;: "Clarify differences between / requirements for request and response CC directives"
    2173          </li>
    2174          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/174">http://tools.ietf.org/wg/httpbis/trac/ticket/174</a>&gt;: "Caching authenticated responses"
    2175          </li>
    2176          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/208">http://tools.ietf.org/wg/httpbis/trac/ticket/208</a>&gt;: "IANA registry for cache-control directives"
    2177          </li>
    2178          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/211">http://tools.ietf.org/wg/httpbis/trac/ticket/211</a>&gt;: "Heuristic caching of URLs with query components"
    2179          </li>
    2180       </ul>
    2181       <p id="rfc.section.C.11.p.2">Partly resolved issues: </p>
    2182       <ul>
    2183          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/196">http://tools.ietf.org/wg/httpbis/trac/ticket/196</a>&gt;: "Term for the requested resource's URI"
    2184          </li>
    2185       </ul>
    2186       <h2 id="rfc.section.C.12"><a href="#rfc.section.C.12">C.12</a>&nbsp;<a id="changes.since.10" href="#changes.since.10">Since draft-ietf-httpbis-p6-cache-10</a></h2>
    2187       <p id="rfc.section.C.12.p.1">Closed issues: </p>
    2188       <ul>
    2189          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/109">http://tools.ietf.org/wg/httpbis/trac/ticket/109</a>&gt;: "Clarify entity / representation / variant terminology"
    2190          </li>
    2191          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/220">http://tools.ietf.org/wg/httpbis/trac/ticket/220</a>&gt;: "consider removing the 'changes from 2068' sections"
    2192          </li>
    2193          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/223">http://tools.ietf.org/wg/httpbis/trac/ticket/223</a>&gt;: "Allowing heuristic caching for new status codes"
    2194          </li>
    2195          <li>Clean up TODOs and prose in "Combining Responses."</li>
    2196       </ul>
    2197       <h2 id="rfc.section.C.13"><a href="#rfc.section.C.13">C.13</a>&nbsp;<a id="changes.since.11" href="#changes.since.11">Since draft-ietf-httpbis-p6-cache-11</a></h2>
    2198       <p id="rfc.section.C.13.p.1">Closed issues: </p>
    2199       <ul>
    2200          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/204">http://tools.ietf.org/wg/httpbis/trac/ticket/204</a>&gt;: "Text about clock requirement for caches belongs in p6"
    2201          </li>
    2202       </ul>
    2203       <h2 id="rfc.section.C.14"><a href="#rfc.section.C.14">C.14</a>&nbsp;<a id="changes.since.12" href="#changes.since.12">Since draft-ietf-httpbis-p6-cache-12</a></h2>
    2204       <p id="rfc.section.C.14.p.1">Closed issues: </p>
    2205       <ul>
    2206          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/224">http://tools.ietf.org/wg/httpbis/trac/ticket/224</a>&gt;: "Header Classification"
    2207          </li>
    2208          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/268">http://tools.ietf.org/wg/httpbis/trac/ticket/268</a>&gt;: "Clarify 'public'"
    2209          </li>
    2210       </ul>
    2211       <h2 id="rfc.section.C.15"><a href="#rfc.section.C.15">C.15</a>&nbsp;<a id="changes.since.13" href="#changes.since.13">Since draft-ietf-httpbis-p6-cache-13</a></h2>
    2212       <p id="rfc.section.C.15.p.1">Closed issues: </p>
    2213       <ul>
    2214          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/276">http://tools.ietf.org/wg/httpbis/trac/ticket/276</a>&gt;: "untangle ABNFs for header fields"
    2215          </li>
    2216       </ul>
    2217       <h2 id="rfc.section.C.16"><a href="#rfc.section.C.16">C.16</a>&nbsp;<a id="changes.since.14" href="#changes.since.14">Since draft-ietf-httpbis-p6-cache-14</a></h2>
    2218       <p id="rfc.section.C.16.p.1">Closed issues: </p>
    2219       <ul>
    2220          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/38">http://tools.ietf.org/wg/httpbis/trac/ticket/38</a>&gt;: "Mismatch Vary"
    2221          </li>
    2222          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/235">http://tools.ietf.org/wg/httpbis/trac/ticket/235</a>&gt;: "Cache Invalidation only happens upon successful responses"
    2223          </li>
    2224          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/282">http://tools.ietf.org/wg/httpbis/trac/ticket/282</a>&gt;: "Recommend minimum sizes for protocol elements"
    2225          </li>
    2226          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/289">http://tools.ietf.org/wg/httpbis/trac/ticket/289</a>&gt;: "Proxies don't 'understand' methods"
    2227          </li>
    2228          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/291">http://tools.ietf.org/wg/httpbis/trac/ticket/291</a>&gt;: "Cache Extensions can override no-store, etc."
    2229          </li>
    2230          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/292">http://tools.ietf.org/wg/httpbis/trac/ticket/292</a>&gt;: "Pragma"
    2231          </li>
    2232       </ul>
    2233       <h2 id="rfc.section.C.17"><a href="#rfc.section.C.17">C.17</a>&nbsp;<a id="changes.since.15" href="#changes.since.15">Since draft-ietf-httpbis-p6-cache-15</a></h2>
    2234       <p id="rfc.section.C.17.p.1">Closed issues: </p>
    2235       <ul>
    2236          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/290">http://tools.ietf.org/wg/httpbis/trac/ticket/290</a>&gt;: "Motivate one-year limit for Expires"
    2237          </li>
    2238       </ul>
    2239       <h2 id="rfc.section.C.18"><a href="#rfc.section.C.18">C.18</a>&nbsp;<a id="changes.since.16" href="#changes.since.16">Since draft-ietf-httpbis-p6-cache-16</a></h2>
    2240       <p id="rfc.section.C.18.p.1">Closed issues: </p>
    2241       <ul>
    2242          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/186">http://tools.ietf.org/wg/httpbis/trac/ticket/186</a>&gt;: "Document HTTP's error-handling philosophy"
    2243          </li>
    2244          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/317">http://tools.ietf.org/wg/httpbis/trac/ticket/317</a>&gt;: "Cache-Control directive case sensitivity"
    2245          </li>
    2246       </ul>
    2247       <h2 id="rfc.section.C.19"><a href="#rfc.section.C.19">C.19</a>&nbsp;<a id="changes.since.17" href="#changes.since.17">Since draft-ietf-httpbis-p6-cache-17</a></h2>
    2248       <p id="rfc.section.C.19.p.1">Closed issues: </p>
    2249       <ul>
    2250          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/293">http://tools.ietf.org/wg/httpbis/trac/ticket/293</a>&gt;: "Interaction of request and response Cache-Control"
    2251          </li>
    2252          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/212">http://tools.ietf.org/wg/httpbis/trac/ticket/212</a>&gt;: "Refining age for 1.1 proxy chains"
    2253          </li>
    2254          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/274">http://tools.ietf.org/wg/httpbis/trac/ticket/274</a>&gt;: "warn-code registry"
    2255          </li>
    2256       </ul>
    2257       <h2 id="rfc.section.C.20"><a href="#rfc.section.C.20">C.20</a>&nbsp;<a id="changes.since.18" href="#changes.since.18">Since draft-ietf-httpbis-p6-cache-18</a></h2>
    2258       <p id="rfc.section.C.20.p.1">Closed issues: </p>
    2259       <ul>
    2260          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/227">http://tools.ietf.org/wg/httpbis/trac/ticket/227</a>&gt;: "Combining HEAD responses"
    2261          </li>
    2262          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/337">http://tools.ietf.org/wg/httpbis/trac/ticket/337</a>&gt;: "Field names in cache-control header arguments"
    2263          </li>
    2264       </ul>
    2265       <h2 id="rfc.section.C.21"><a href="#rfc.section.C.21">C.21</a>&nbsp;<a id="changes.since.19" href="#changes.since.19">Since draft-ietf-httpbis-p6-cache-19</a></h2>
    2266       <p id="rfc.section.C.21.p.1">None yet.</p>
     2021      <p id="rfc.section.C.p.1">Changes up to the first Working Group Last Call draft are summarized in &lt;<a href="http://trac.tools.ietf.org/html/draft-ietf-httpbis-p6-cache-19#appendix-C">http://trac.tools.ietf.org/html/draft-ietf-httpbis-p6-cache-19#appendix-C</a>&gt;.
     2022      </p>
     2023      <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a>&nbsp;<a id="changes.since.19" href="#changes.since.19">Since draft-ietf-httpbis-p6-cache-19</a></h2>
     2024      <p id="rfc.section.C.1.p.1">None yet.</p>
    22672025      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    22682026      <p class="noprint"><a href="#rfc.index.1">1</a> <a href="#rfc.index.2">2</a> <a href="#rfc.index.A">A</a> <a href="#rfc.index.C">C</a> <a href="#rfc.index.E">E</a> <a href="#rfc.index.F">F</a> <a href="#rfc.index.G">G</a> <a href="#rfc.index.H">H</a> <a href="#rfc.index.M">M</a> <a href="#rfc.index.N">N</a> <a href="#rfc.index.O">O</a> <a href="#rfc.index.P">P</a> <a href="#rfc.index.R">R</a> <a href="#rfc.index.S">S</a> <a href="#rfc.index.V">V</a> <a href="#rfc.index.W">W</a>
     
    24242182                  </li>
    24252183                  <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">1.4.2</a>, <a href="#rfc.xref.Part2.2">2</a>, <a href="#rfc.xref.Part2.3">2.2</a>, <a href="#rfc.xref.Part2.4">2.3.1.1</a>, <a href="#rfc.xref.Part2.5">2.3.2</a>, <a href="#rfc.xref.Part2.6">2.6</a>, <a href="#rfc.xref.Part2.7">3.3</a>, <a href="#Part2"><b>8.1</b></a><ul>
    2426                         <li><em>Section 6.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.3">2.2</a>, <a href="#rfc.xref.Part2.6">2.6</a></li>
    2427                         <li><em>Section 7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.4">2.3.1.1</a></li>
    2428                         <li><em>Section 8</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">1.4.2</a>, <a href="#rfc.xref.Part2.7">3.3</a></li>
    2429                         <li><em>Section 10.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.5">2.3.2</a></li>
     2184                        <li><em>Appendix </em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.4">2.3.1.1</a></li>
     2185                        <li><em>Section 2.1.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.3">2.2</a>, <a href="#rfc.xref.Part2.6">2.6</a></li>
     2186                        <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">1.4.2</a>, <a href="#rfc.xref.Part2.7">3.3</a></li>
     2187                        <li><em>Section 7.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.5">2.3.2</a></li>
    24302188                     </ul>
    24312189                  </li>
     
    24672225                  <li><em>RFC1305</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1305.1">2.2</a>, <a href="#rfc.xref.RFC1305.2">2.3.2</a>, <a href="#RFC1305"><b>8.2</b></a></li>
    24682226                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.3</a>, <a href="#RFC2119"><b>8.1</b></a></li>
    2469                   <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">2.3.1.1</a>, <a href="#RFC2616"><b>8.2</b></a>, <a href="#rfc.xref.RFC2616.2">C.1</a><ul>
     2227                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">2.3.1.1</a>, <a href="#RFC2616"><b>8.2</b></a><ul>
    24702228                        <li><em>Section 13.9</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">2.3.1.1</a></li>
    24712229                     </ul>
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