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Changeset 391 for draft-ietf-httpbis/latest/p6-cache.html
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- 15/11/08 00:44:55 (14 years ago)
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draft-ietf-httpbis/latest/p6-cache.html (modified) (8 diffs)
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draft-ietf-httpbis/latest/p6-cache.html
r382 r391 485 485 <tr> 486 486 <td class="header left"></td> 487 <td class="header right">November 1 4, 2008</td>487 <td class="header right">November 15, 2008</td> 488 488 </tr> 489 489 </table> … … 718 718 </p> 719 719 <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a> <a id="notation" href="#notation">Notational Conventions and Generic Grammar</a></h1> 720 <p id="rfc.section.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation.abnf" title="ABNF Extension: #rule">Section 2.1</a> of <a href="#Part1" id="rfc.xref.Part1.1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> and the core rules defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section2.2</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>:721 </p> 722 <div id="rfc.figure.u.1"></div><pre class="inline"> <a href="#notation" class="smpl">DIGIT</a> = <DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>>723 <a href="#notation" class="smpl">DQUOTE</a> = <DQUOTE, defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>>724 <a href="#notation" class="smpl">SP</a> = <SP, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>>725 </pre><div id="rfc.figure.u.2"></div><pre class="inline"> <a href="#notation" class="smpl">quoted-string</a> = <quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>>726 <a href="#notation" class="smpl">token</a> = <token, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>>727 <a href="#notation" class="smpl">OWS</a> = <OWS, 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#basic.rules" title="Basic Rules">Section 2.2</a>>720 <p id="rfc.section.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation.abnf" title="ABNF Extension: #rule">Section 1.2.1</a> of <a href="#Part1" id="rfc.xref.Part1.1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> and the core rules defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>: 721 </p> 722 <div id="rfc.figure.u.1"></div><pre class="inline"> <a href="#notation" class="smpl">DIGIT</a> = <DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 723 <a href="#notation" class="smpl">DQUOTE</a> = <DQUOTE, defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 724 <a href="#notation" class="smpl">SP</a> = <SP, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 725 </pre><div id="rfc.figure.u.2"></div><pre class="inline"> <a href="#notation" class="smpl">quoted-string</a> = <quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 726 <a href="#notation" class="smpl">token</a> = <token, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 727 <a href="#notation" class="smpl">OWS</a> = <OWS, 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#basic.rules" title="Basic Rules">Section 1.2.2</a>> 728 728 </pre><div id="abnf.dependencies"> 729 729 <p id="rfc.section.2.p.4"> The ABNF rules below are defined in other parts:</p> 730 730 </div> 731 731 <div id="rfc.figure.u.3"></div><pre class="inline"> <a href="#abnf.dependencies" class="smpl">field-name</a> = <field-name, 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#message.headers" title="Message Headers">Section 4.2</a>> 732 <a href="#abnf.dependencies" class="smpl">HTTP-date</a> = <HTTP-date, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#full.date" title="Full Date">Section 3. 3.1</a>>733 <a href="#abnf.dependencies" class="smpl">port</a> = <port, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 3.2</a>>732 <a href="#abnf.dependencies" class="smpl">HTTP-date</a> = <HTTP-date, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#full.date" title="Full Date">Section 3.2.1</a>> 733 <a href="#abnf.dependencies" class="smpl">port</a> = <port, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>> 734 734 <a href="#abnf.dependencies" class="smpl">pseudonym</a> = <pseudonym, defined in <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.via" title="Via">Section 8.9</a>> 735 <a href="#abnf.dependencies" class="smpl">uri-host</a> = <uri-host, defined in <a href="#Part1" id="rfc.xref.Part1.13"><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 3.2</a>>735 <a href="#abnf.dependencies" class="smpl">uri-host</a> = <uri-host, defined in <a href="#Part1" id="rfc.xref.Part1.13"><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 2.1</a>> 736 736 </pre><h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a> <a id="caching.overview" href="#caching.overview">Overview</a></h1> 737 737 <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a> <a id="cache.correctness" href="#cache.correctness">Cache Correctness</a></h2> … … 1122 1122 as the "selecting" request-headers. 1123 1123 </p> 1124 <p id="rfc.section.8.p.3">When the cache receives a subsequent request whose Request-URIspecifies one or more cache entries including a Vary header1124 <p id="rfc.section.8.p.3">When the cache receives a subsequent request whose request-target specifies one or more cache entries including a Vary header 1125 1125 field, the cache <em class="bcp14">MUST NOT</em> use such a cache entry to construct a response to the new request unless all of the selecting request-headers present in the 1126 1126 new request match the corresponding stored request-headers in the original request. … … 1147 1147 </p> 1148 1148 <p id="rfc.section.8.p.9">If a cache receives a successful response whose Content-Location field matches that of an existing cache entry for the same 1149 Request-URI, whose entity-tag differs from that of the existing entry, and whose Date is more recent than that of the existing1149 request-target, whose entity-tag differs from that of the existing entry, and whose Date is more recent than that of the existing 1150 1150 entry, the existing entry <em class="bcp14">SHOULD NOT</em> be returned in response to future requests and <em class="bcp14">SHOULD</em> be deleted from the cache. 1151 1151 </p> … … 1183 1183 to a subsequent request. 1184 1184 </p> 1185 <p id="rfc.section.12.p.4">Some HTTP methods <em class="bcp14">MUST</em> cause a cache to invalidate an entity. This is either the entity referred to by the Request-URI, or by the Location or Content-Location1186 headers (if present). These methods are:1185 <p id="rfc.section.12.p.4">Some HTTP methods <em class="bcp14">MUST</em> cause a cache to invalidate an entity. This is either the entity referred to by the request-target, or by the Location or 1186 Content-Location headers (if present). These methods are: 1187 1187 </p> 1188 1188 <ul> … … 1191 1191 <li>POST</li> 1192 1192 </ul> 1193 <p id="rfc.section.12.p.5">An invalidation based on the URI in a Location or Content-Location header <em class="bcp14">MUST NOT</em> be performed if the host part of that URI differs from the host part in the Request-URI. This helps prevent denial of service1193 <p id="rfc.section.12.p.5">An invalidation based on the URI in a Location or Content-Location header <em class="bcp14">MUST NOT</em> be performed if the host part of that URI differs from the host part in the request-target. This helps prevent denial of service 1194 1194 attacks. 1195 1195 </p> 1196 <p id="rfc.section.12.p.6">A cache that passes through requests for methods it does not understand <em class="bcp14">SHOULD</em> invalidate any entities referred to by the Request-URI.1196 <p id="rfc.section.12.p.6">A cache that passes through requests for methods it does not understand <em class="bcp14">SHOULD</em> invalidate any entities referred to by the request-target. 1197 1197 </p> 1198 1198 <h1 id="rfc.section.13"><a href="#rfc.section.13">13.</a> <a id="write-through.mandatory" href="#write-through.mandatory">Write-Through Mandatory</a></h1> … … 1572 1572 that time. 1573 1573 </p> 1574 <p id="rfc.section.16.3.p.3">The format is an absolute date and time as defined by HTTP-date in <a href="p1-messaging.html#full.date" title="Full Date">Section 3. 3.1</a> of <a href="#Part1" id="rfc.xref.Part1.19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format.1574 <p id="rfc.section.16.3.p.3">The format is an absolute date and time as defined by HTTP-date in <a href="p1-messaging.html#full.date" title="Full Date">Section 3.2.1</a> of <a href="#Part1" id="rfc.xref.Part1.19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>; it <em class="bcp14">MUST</em> be sent in rfc1123-date format. 1575 1575 </p> 1576 1576 <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.10"></span><span id="rfc.iref.g.11"></span> <a href="#header.expires" class="smpl">Expires</a> = "Expires" ":" <a href="#notation" class="smpl">OWS</a> <a href="#header.expires" class="smpl">Expires-v</a> … … 2155 2155 <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind"> 2156 2156 <li class="indline1"><em>Part1</em> <a class="iref" href="#rfc.xref.Part1.1">2</a>, <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a>, <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.12">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a>, <a class="iref" href="#rfc.xref.Part1.14">4.3</a>, <a class="iref" href="#rfc.xref.Part1.15">7.1</a>, <a class="iref" href="#rfc.xref.Part1.16">7.2</a>, <a class="iref" href="#rfc.xref.Part1.17">7.2</a>, <a class="iref" href="#rfc.xref.Part1.18">8</a>, <a class="iref" href="#rfc.xref.Part1.19">16.3</a>, <a class="iref" href="#Part1"><b>20.1</b></a>, <a class="iref" href="#rfc.xref.Part1.20">A.1</a><ul class="ind"> 2157 <li class="indline1"><em>Section 2.1</em> <a class="iref" href="#rfc.xref.Part1.1">2</a></li>2158 <li class="indline1"><em>Section 2.2</em> <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a></li>2159 <li class="indline1"><em>Section 3.2</em> <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a></li>2160 <li class="indline1"><em>Section 3. 3.1</em> <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.19">16.3</a></li>2157 <li class="indline1"><em>Section 1.2.1</em> <a class="iref" href="#rfc.xref.Part1.1">2</a></li> 2158 <li class="indline1"><em>Section 1.2.2</em> <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a></li> 2159 <li class="indline1"><em>Section 2.1</em> <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a></li> 2160 <li class="indline1"><em>Section 3.2.1</em> <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.19">16.3</a></li> 2161 2161 <li class="indline1"><em>Section 4.2</em> <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.18">8</a></li> 2162 2162 <li class="indline1"><em>Section 4.4</em> <a class="iref" href="#rfc.xref.Part1.16">7.2</a>, <a class="iref" href="#rfc.xref.Part1.17">7.2</a></li>
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