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Timestamp:
01/01/11 17:23:02 (9 years ago)
Author:
julian.reschke@…
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bump up document dates, update to latest version of rfc2629.xslt

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  • draft-ietf-httpbis/00/p4-conditional.html

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    345336      <link rel="Chapter" title="9 Acknowledgments" href="#rfc.section.9">
    346337      <link rel="Chapter" href="#rfc.section.10" title="10 References">
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    349       <meta name="DC.Creator" content="Fielding, R.">
    350       <meta name="DC.Creator" content="Gettys, J.">
    351       <meta name="DC.Creator" content="Mogul, J.">
    352       <meta name="DC.Creator" content="Frystyk, H.">
    353       <meta name="DC.Creator" content="Masinter, L.">
    354       <meta name="DC.Creator" content="Leach, P.">
    355       <meta name="DC.Creator" content="Berners-Lee, T.">
    356       <meta name="DC.Identifier" content="urn:ietf:id:draft-ietf-httpbis-p4-conditional-00">
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    360       <meta name="DC.Description.Abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 4 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 4 defines request header fields for indicating conditional requests and the rules for constructing responses to those requests.">
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     341      <meta name="dct.creator" content="Gettys, J.">
     342      <meta name="dct.creator" content="Mogul, J.">
     343      <meta name="dct.creator" content="Frystyk, H.">
     344      <meta name="dct.creator" content="Masinter, L.">
     345      <meta name="dct.creator" content="Leach, P.">
     346      <meta name="dct.creator" content="Berners-Lee, T.">
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     351      <meta name="dct.abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 4 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 4 defines request header fields for indicating conditional requests and the rules for constructing responses to those requests.">
     352      <meta name="description" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 4 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 4 defines request header fields for indicating conditional requests and the rules for constructing responses to those requests.">
    361353   </head>
    362354   <body>
    363       <table summary="header information" class="header" border="0" cellpadding="1" cellspacing="1">
    364          <tr>
    365             <td class="header left">Network Working Group</td>
    366             <td class="header right">R. Fielding, Editor</td>
    367          </tr>
    368          <tr>
    369             <td class="header left">Internet Draft</td>
    370             <td class="header right">Day Software</td>
    371          </tr>
    372          <tr>
    373             <td class="header left">
    374                &lt;draft-ietf-httpbis-p4-conditional-00&gt;
    375                
    376             </td>
    377             <td class="header right">J. Gettys</td>
    378          </tr>
    379          <tr>
    380             <td class="header left">Obsoletes: <a href="http://tools.ietf.org/html/rfc2068">2068</a>,
    381                <a href="http://tools.ietf.org/html/rfc2616">2616</a> (if approved)
    382             </td>
    383             <td class="header right">One Laptop per Child</td>
    384          </tr>
    385          <tr>
    386             <td class="header left">Intended status: Standards Track</td>
    387             <td class="header right">J. Mogul</td>
    388          </tr>
    389          <tr>
    390             <td class="header left">Expires: June 2008</td>
    391             <td class="header right">HP</td>
    392          </tr>
    393          <tr>
    394             <td class="header left"></td>
    395             <td class="header right">H. Frystyk</td>
    396          </tr>
    397          <tr>
    398             <td class="header left"></td>
    399             <td class="header right">Microsoft</td>
    400          </tr>
    401          <tr>
    402             <td class="header left"></td>
    403             <td class="header right">L. Masinter</td>
    404          </tr>
    405          <tr>
    406             <td class="header left"></td>
    407             <td class="header right">Adobe Systems</td>
    408          </tr>
    409          <tr>
    410             <td class="header left"></td>
    411             <td class="header right">P. Leach</td>
    412          </tr>
    413          <tr>
    414             <td class="header left"></td>
    415             <td class="header right">Microsoft</td>
    416          </tr>
    417          <tr>
    418             <td class="header left"></td>
    419             <td class="header right">T. Berners-Lee</td>
    420          </tr>
    421          <tr>
    422             <td class="header left"></td>
    423             <td class="header right">W3C/MIT</td>
    424          </tr>
    425          <tr>
    426             <td class="header left"></td>
    427             <td class="header right">December 20, 2007</td>
    428          </tr>
     355      <table class="header">
     356         <tbody>
     357            <tr>
     358               <td class="left">Network Working Group</td>
     359               <td class="right">R. Fielding, Editor</td>
     360            </tr>
     361            <tr>
     362               <td class="left">Internet-Draft</td>
     363               <td class="right">Day Software</td>
     364            </tr>
     365            <tr>
     366               <td class="left">Obsoletes: <a href="http://tools.ietf.org/html/rfc2068">2068</a>, <a href="http://tools.ietf.org/html/rfc2616">2616</a> (if approved)
     367               </td>
     368               <td class="right">J. Gettys</td>
     369            </tr>
     370            <tr>
     371               <td class="left">Intended status: Standards Track</td>
     372               <td class="right">One Laptop per Child</td>
     373            </tr>
     374            <tr>
     375               <td class="left">Expires: June 22, 2008</td>
     376               <td class="right">J. Mogul</td>
     377            </tr>
     378            <tr>
     379               <td class="left"></td>
     380               <td class="right">HP</td>
     381            </tr>
     382            <tr>
     383               <td class="left"></td>
     384               <td class="right">H. Frystyk</td>
     385            </tr>
     386            <tr>
     387               <td class="left"></td>
     388               <td class="right">Microsoft</td>
     389            </tr>
     390            <tr>
     391               <td class="left"></td>
     392               <td class="right">L. Masinter</td>
     393            </tr>
     394            <tr>
     395               <td class="left"></td>
     396               <td class="right">Adobe Systems</td>
     397            </tr>
     398            <tr>
     399               <td class="left"></td>
     400               <td class="right">P. Leach</td>
     401            </tr>
     402            <tr>
     403               <td class="left"></td>
     404               <td class="right">Microsoft</td>
     405            </tr>
     406            <tr>
     407               <td class="left"></td>
     408               <td class="right">T. Berners-Lee</td>
     409            </tr>
     410            <tr>
     411               <td class="left"></td>
     412               <td class="right">W3C/MIT</td>
     413            </tr>
     414            <tr>
     415               <td class="left"></td>
     416               <td class="right">December 20, 2007</td>
     417            </tr>
     418         </tbody>
    429419      </table>
    430420      <p class="title">HTTP/1.1, part 4: Conditional Requests<br><span class="filename">draft-ietf-httpbis-p4-conditional-00</span></p>
    … …  
    441431         in progress”.
    442432      </p>
    443       <p>The list of current Internet-Drafts can be accessed at &lt;<a href="http://www.ietf.org/ietf/1id-abstracts.txt">http://www.ietf.org/ietf/1id-abstracts.txt</a>&gt;.
    444       </p>
    445       <p>The list of Internet-Draft Shadow Directories can be accessed at &lt;<a href="http://www.ietf.org/shadow.html">http://www.ietf.org/shadow.html</a>&gt;.
    446       </p>
    447       <p>This Internet-Draft will expire in June 2008.</p>
     433      <p>The list of current Internet-Drafts can be accessed at <a href="http://www.ietf.org/ietf/1id-abstracts.txt">http://www.ietf.org/ietf/1id-abstracts.txt</a>.
     434      </p>
     435      <p>The list of Internet-Draft Shadow Directories can be accessed at <a href="http://www.ietf.org/shadow.html">http://www.ietf.org/shadow.html</a>.
     436      </p>
     437      <p>This Internet-Draft will expire on June 22, 2008.</p>
    448438      <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
    449439      <p>The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
    … …  
    466456      <h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1>
    467457      <ul class="toc">
    468          <li class="tocline0">1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a></li>
    469          <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#entity.tags">Entity Tags</a></li>
    470          <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#rfc.section.3">Status Code Definitions</a><ul class="toc">
    471                <li class="tocline1">3.1&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
    472                <li class="tocline1">3.2&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
     458         <li>1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a></li>
     459         <li>2.&nbsp;&nbsp;&nbsp;<a href="#entity.tags">Entity Tags</a></li>
     460         <li>3.&nbsp;&nbsp;&nbsp;<a href="#rfc.section.3">Status Code Definitions</a><ul>
     461               <li>3.1&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
     462               <li>3.2&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
    473463            </ul>
    474464         </li>
    475          <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#weak.and.strong.validators">Weak and Strong Validators</a></li>
    476          <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#rules.for.when.to.use.entity.tags.and.last-modified.dates">Rules for When to Use Entity Tags and Last-Modified Dates</a></li>
    477          <li class="tocline0">6.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
    478                <li class="tocline1">6.1&nbsp;&nbsp;&nbsp;<a href="#header.etag">ETag</a></li>
    479                <li class="tocline1">6.2&nbsp;&nbsp;&nbsp;<a href="#header.if-match">If-Match</a></li>
    480                <li class="tocline1">6.3&nbsp;&nbsp;&nbsp;<a href="#header.if-modified-since">If-Modified-Since</a></li>
    481                <li class="tocline1">6.4&nbsp;&nbsp;&nbsp;<a href="#header.if-none-match">If-None-Match</a></li>
    482                <li class="tocline1">6.5&nbsp;&nbsp;&nbsp;<a href="#header.if-unmodified-since">If-Unmodified-Since</a></li>
    483                <li class="tocline1">6.6&nbsp;&nbsp;&nbsp;<a href="#header.last-modified">Last-Modified</a></li>
     465         <li>4.&nbsp;&nbsp;&nbsp;<a href="#weak.and.strong.validators">Weak and Strong Validators</a></li>
     466         <li>5.&nbsp;&nbsp;&nbsp;<a href="#rules.for.when.to.use.entity.tags.and.last-modified.dates">Rules for When to Use Entity Tags and Last-Modified Dates</a></li>
     467         <li>6.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul>
     468               <li>6.1&nbsp;&nbsp;&nbsp;<a href="#header.etag">ETag</a></li>
     469               <li>6.2&nbsp;&nbsp;&nbsp;<a href="#header.if-match">If-Match</a></li>
     470               <li>6.3&nbsp;&nbsp;&nbsp;<a href="#header.if-modified-since">If-Modified-Since</a></li>
     471               <li>6.4&nbsp;&nbsp;&nbsp;<a href="#header.if-none-match">If-None-Match</a></li>
     472               <li>6.5&nbsp;&nbsp;&nbsp;<a href="#header.if-unmodified-since">If-Unmodified-Since</a></li>
     473               <li>6.6&nbsp;&nbsp;&nbsp;<a href="#header.last-modified">Last-Modified</a></li>
    484474            </ul>
    485475         </li>
    486          <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a></li>
    487          <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
    488          <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
    489          <li class="tocline0">10.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a></li>
    490          <li class="tocline0"><a href="#rfc.authors">Authors' Addresses</a></li>
    491          <li class="tocline0"><a href="#rfc.ipr">Intellectual Property and Copyright Statements</a></li>
    492          <li class="tocline0"><a href="#rfc.index">Index</a></li>
     476         <li>7.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a></li>
     477         <li>8.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
     478         <li>9.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
     479         <li>10.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a></li>
     480         <li><a href="#rfc.authors">Authors' Addresses</a></li>
     481         <li><a href="#rfc.index">Index</a></li>
     482         <li><a href="#rfc.ipr">Intellectual Property and Copyright Statements</a></li>
    493483      </ul>
    494484      <h1 id="rfc.section.1" class="np"><a href="#rfc.section.1">1.</a>&nbsp;<a id="introduction" href="#introduction">Introduction</a></h1>
    … …  
    559549         entity, while a weak validator is part of an identifier for a set of semantically equivalent entities.
    560550      </p>
    561       <dl class="empty">
    562          <dd> <b>Note:</b> One example of a strong validator is an integer that is incremented in stable storage every time an entity is changed.
    563          </dd>
    564          <dd>An entity's modification time, if represented with one-second resolution, could be a weak validator, since it is possible
     551      <ul class="empty">
     552         <li> <b>Note:</b> One example of a strong validator is an integer that is incremented in stable storage every time an entity is changed.
     553         </li>
     554         <li>An entity's modification time, if represented with one-second resolution, could be a weak validator, since it is possible
    565555            that the resource might be modified twice during a single second.
    566          </dd>
    567          <dd>Support for weak validators is optional. However, weak validators allow for more efficient caching of equivalent objects;
     556         </li>
     557         <li>Support for weak validators is optional. However, weak validators allow for more efficient caching of equivalent objects;
    568558            for example, a hit counter on a site is probably good enough if it is updated every few days or weeks, and any value during
    569559            that period is likely "good enough" to be equivalent.
    570          </dd>
    571       </dl>
     560         </li>
     561      </ul>
    572562      <p id="rfc.section.4.p.4">A "use" of a validator is either when a client generates a request and includes the validator in a validating header field,
    573563         or when a server compares two validators.
    … …  
    646636      <p id="rfc.section.5.p.4">In order to be legal, a strong entity tag <em class="bcp14">MUST</em> change whenever the associated entity value changes in any way. A weak entity tag <em class="bcp14">SHOULD</em> change whenever the associated entity changes in a semantically significant way.
    647637      </p>
    648       <dl class="empty">
    649          <dd> <b>Note:</b> in order to provide semantically transparent caching, an origin server must avoid reusing a specific strong entity tag value
     638      <ul class="empty">
     639         <li> <b>Note:</b> in order to provide semantically transparent caching, an origin server must avoid reusing a specific strong entity tag value
    650640            for two different entities, or reusing a specific weak entity tag value for two semantically different entities. Cache entries
    651641            might persist for arbitrarily long periods, regardless of expiration times, so it might be inappropriate to expect that a
    652642            cache will never again attempt to validate an entry using a validator that it obtained at some point in the past.
    653          </dd>
    654       </dl>
     643         </li>
     644      </ul>
    655645      <p id="rfc.section.5.p.5">HTTP/1.1 clients: </p>
    656646      <ul>
    … …  
    673663         fields in the request.
    674664      </p>
    675       <dl class="empty">
    676          <dd> <b>Note:</b> The general principle behind these rules is that HTTP/1.1 servers and clients should transmit as much non-redundant information
     665      <ul class="empty">
     666         <li> <b>Note:</b> The general principle behind these rules is that HTTP/1.1 servers and clients should transmit as much non-redundant information
    677667            as is available in their responses and requests. HTTP/1.1 systems receiving this information will make the most conservative
    678668            assumptions about the validators they receive.
    679          </dd>
    680          <dd>HTTP/1.0 clients and caches will ignore entity tags. Generally, last-modified values received or used by these systems will
     669         </li>
     670         <li>HTTP/1.0 clients and caches will ignore entity tags. Generally, last-modified values received or used by these systems will
    681671            support transparent and efficient caching, and so HTTP/1.1 origin servers should provide Last-Modified values. In those rare
    682672            cases where the use of a Last-Modified value as a validator by an HTTP/1.0 system could result in a serious problem, then
    683673            HTTP/1.1 origin servers should not provide one.
    684          </dd>
    685       </dl>
     674         </li>
     675      </ul>
    686676      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Field Definitions</a></h1>
    687677      <p id="rfc.section.6.p.1">This section defines the syntax and semantics of all standard HTTP/1.1 header fields. For entity-header fields, both sender
    … …  
    756746      </ol>
    757747      <p id="rfc.section.6.3.p.6">The purpose of this feature is to allow efficient updates of cached information with a minimum amount of transaction overhead. </p>
    758       <dl class="empty">
    759          <dd> <b>Note:</b> The Range request-header field modifies the meaning of If-Modified-Since; see <a href="p5-range.html#header.range" title="Range">Section 5.4</a> of <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> for full details.
    760          </dd>
    761          <dd> <b>Note:</b> If-Modified-Since times are interpreted by the server, whose clock might not be synchronized with the client.
    762          </dd>
    763          <dd> <b>Note:</b> When handling an If-Modified-Since header field, some servers will use an exact date comparison function, rather than a less-than
     748      <ul class="empty">
     749         <li> <b>Note:</b> The Range request-header field modifies the meaning of If-Modified-Since; see <a href="p5-range.html#header.range" title="Range">Section 5.4</a> of <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> for full details.
     750         </li>
     751         <li> <b>Note:</b> If-Modified-Since times are interpreted by the server, whose clock might not be synchronized with the client.
     752         </li>
     753         <li> <b>Note:</b> When handling an If-Modified-Since header field, some servers will use an exact date comparison function, rather than a less-than
    764754            function, for deciding whether to send a 304 (Not Modified) response. To get best results when sending an If-Modified-Since
    765755            header field for cache validation, clients are advised to use the exact date string received in a previous Last-Modified header
    766756            field whenever possible.
    767          </dd>
    768          <dd> <b>Note:</b> If a client uses an arbitrary date in the If-Modified-Since header instead of a date taken from the Last-Modified header for
     757         </li>
     758         <li> <b>Note:</b> If a client uses an arbitrary date in the If-Modified-Since header instead of a date taken from the Last-Modified header for
    769759            the same request, the client should be aware of the fact that this date is interpreted in the server's understanding of time.
    770760            The client should consider unsynchronized clocks and rounding problems due to the different encodings of time between the
    … …  
    773763            If-Modified-Since date is derived from the client's clock without correction to the server's clock. Corrections for different
    774764            time bases between client and server are at best approximate due to network latency.
    775          </dd>
    776       </dl>
     765         </li>
     766      </ul>
    777767      <p id="rfc.section.6.3.p.7">The result of a request having both an If-Modified-Since header field and either an If-Match or an If-Unmodified-Since header
    778768         fields is undefined by this specification.
    … …  
    863853      <h1 id="rfc.references"><a href="#rfc.section.10" id="rfc.section.10">10.</a> References
    864854      </h1>
    865       <table summary="References">         
     855      <table>         
    866856         <tr>
    867857            <td class="reference"><b id="Part1">[Part1]</b></td>
    868             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, and <a title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-00">HTTP/1.1, part 1: URIs, Connections, and Message Parsing</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p1-messaging-00 (work in progress), December&nbsp;2007.
     858            <td class="top"><a href="mailto:fielding@gbiv.com" title="Day Software">Fielding, R., Ed.</a>, <a href="mailto:jg@laptop.org" title="One Laptop per Child">Gettys, J.</a>, <a href="mailto:JeffMogul@acm.org" title="Hewlett-Packard Company">Mogul, J.</a>, <a href="mailto:henrikn@microsoft.com" title="Microsoft Corporation">Frystyk, H.</a>, <a href="mailto:LMM@acm.org" title="Adobe Systems, Incorporated">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-00">HTTP/1.1, part 1: URIs, Connections, and Message Parsing</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p1-messaging-00 (work in progress), December&nbsp;2007.
    869859            </td>
    870860         </tr>
    871861         <tr>
    872862            <td class="reference"><b id="Part5">[Part5]</b></td>
    873             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, and <a title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-00">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-00 (work in progress), December&nbsp;2007.
     863            <td class="top"><a href="mailto:fielding@gbiv.com" title="Day Software">Fielding, R., Ed.</a>, <a href="mailto:jg@laptop.org" title="One Laptop per Child">Gettys, J.</a>, <a href="mailto:JeffMogul@acm.org" title="Hewlett-Packard Company">Mogul, J.</a>, <a href="mailto:henrikn@microsoft.com" title="Microsoft Corporation">Frystyk, H.</a>, <a href="mailto:LMM@acm.org" title="Adobe Systems, Incorporated">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-00">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-00 (work in progress), December&nbsp;2007.
    874864            </td>
    875865         </tr>
    876866         <tr>
    877867            <td class="reference"><b id="Part6">[Part6]</b></td>
    878             <td class="top"><a title="Day Software">Fielding, R., Ed.</a>, <a title="One Laptop per Child">Gettys, J.</a>, <a title="Hewlett-Packard Company">Mogul, J.</a>, <a title="Microsoft Corporation">Frystyk, H.</a>, <a title="Adobe Systems, Incorporated">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, and <a title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-00">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-00 (work in progress), December&nbsp;2007.
     868            <td class="top"><a href="mailto:fielding@gbiv.com" title="Day Software">Fielding, R., Ed.</a>, <a href="mailto:jg@laptop.org" title="One Laptop per Child">Gettys, J.</a>, <a href="mailto:JeffMogul@acm.org" title="Hewlett-Packard Company">Mogul, J.</a>, <a href="mailto:henrikn@microsoft.com" title="Microsoft Corporation">Frystyk, H.</a>, <a href="mailto:LMM@acm.org" title="Adobe Systems, Incorporated">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-00">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-00 (work in progress), December&nbsp;2007.
    879869            </td>
    880870         </tr>
    881871         <tr>
    882872            <td class="reference"><b id="RFC2068">[RFC2068]</b></td>
    883             <td class="top"><a title="University of California, Irvine, Department of Information and Computer Science">Fielding, R.</a>, <a title="MIT Laboratory for Computer Science">Gettys, J.</a>, <a title="Digital Equipment Corporation, Western Research Laboratory">Mogul, J.</a>, <a title="MIT Laboratory for Computer Science">Nielsen, H.</a>, and <a title="MIT Laboratory for Computer Science">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/rfc2068">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2068, January&nbsp;1997.
     873            <td class="top"><a href="mailto:fielding@ics.uci.edu" title="University of California, Irvine, Department of Information and Computer Science">Fielding, R.</a>, <a href="mailto:jg@w3.org" title="MIT Laboratory for Computer Science">Gettys, J.</a>, <a href="mailto:mogul@wrl.dec.com" title="Digital Equipment Corporation, Western Research Laboratory">Mogul, J.</a>, <a href="mailto:frystyk@w3.org" title="MIT Laboratory for Computer Science">Nielsen, H.</a>, and <a href="mailto:timbl@w3.org" title="MIT Laboratory for Computer Science">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/rfc2068">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2068, January&nbsp;1997.
    884874            </td>
    885875         </tr>
    886876         <tr>
    887877            <td class="reference"><b id="RFC2616">[RFC2616]</b></td>
    888             <td class="top"><a title="University of California, Irvine">Fielding, R.</a>, <a title="W3C">Gettys, J.</a>, <a title="Compaq Computer Corporation">Mogul, J.</a>, <a title="MIT Laboratory for Computer Science">Frystyk, H.</a>, <a title="Xerox Corporation">Masinter, L.</a>, <a title="Microsoft Corporation">Leach, P.</a>, and <a title="W3C">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/rfc2616">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2616, June&nbsp;1999.
     878            <td class="top"><a href="mailto:fielding@ics.uci.edu" title="University of California, Irvine">Fielding, R.</a>, <a href="mailto:jg@w3.org" title="W3C">Gettys, J.</a>, <a href="mailto:mogul@wrl.dec.com" title="Compaq Computer Corporation">Mogul, J.</a>, <a href="mailto:frystyk@w3.org" title="MIT Laboratory for Computer Science">Frystyk, H.</a>, <a href="mailto:masinter@parc.xerox.com" title="Xerox Corporation">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="W3C">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/rfc2616">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2616, June&nbsp;1999.
    889879            </td>
    890880         </tr>
    891881      </table>
    892       <h1 id="rfc.authors"><a href="#rfc.authors">Authors' Addresses</a></h1>
    893       <address class="vcard"><span class="vcardline"><span class="fn">Roy T. Fielding</span>
    894             (editor)
    895             <span class="n hidden"><span class="family-name">Fielding</span><span class="given-name">Roy T.</span></span></span><span class="org vcardline">Day Software</span><span class="adr"><span class="street-address vcardline">23 Corporate Plaza DR, Suite 280</span><span class="vcardline"><span class="locality">Newport Beach</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">92660</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline tel">Phone: <a href="tel:+1-949-706-5300"><span class="value">+1-949-706-5300</span></a></span><span class="vcardline tel"><span class="type">Fax</span>: <a href="fax:+1-949-706-5305"><span class="value">+1-949-706-5305</span></a></span><span class="vcardline">EMail: <a><span class="email">fielding@gbiv.com</span></a></span><span class="vcardline">URI: <a href="http://roy.gbiv.com/" class="url">http://roy.gbiv.com/</a></span></address>
    896       <address class="vcard"><span class="vcardline"><span class="fn">Jim Gettys</span><span class="n hidden"><span class="family-name">Gettys</span><span class="given-name">Jim</span></span></span><span class="org vcardline">One Laptop per Child</span><span class="adr"><span class="street-address vcardline">21 Oak Knoll Road</span><span class="vcardline"><span class="locality">Carlisle</span>, <span class="region">MA</span>&nbsp;<span class="postal-code">01741</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a><span class="email">jg@laptop.org</span></a></span><span class="vcardline">URI: <a href="http://www.laptop.org/" class="url">http://www.laptop.org/</a></span></address>
    897       <address class="vcard"><span class="vcardline"><span class="fn">Jeffrey C. Mogul</span><span class="n hidden"><span class="family-name">Mogul</span><span class="given-name">Jeffrey C.</span></span></span><span class="org vcardline">Hewlett-Packard Company</span><span class="adr"><span class="street-address vcardline">HP Labs, Large Scale Systems Group</span><span class="street-address vcardline">1501 Page Mill Road, MS 1177</span><span class="vcardline"><span class="locality">Palo Alto</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">94304</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a><span class="email">JeffMogul@acm.org</span></a></span></address>
    898       <address class="vcard"><span class="vcardline"><span class="fn">Henrik Frystyk Nielsen</span><span class="n hidden"><span class="family-name">Frystyk</span></span></span><span class="org vcardline">Microsoft Corporation</span><span class="adr"><span class="street-address vcardline">1 Microsoft Way</span><span class="vcardline"><span class="locality">Redmond</span>, <span class="region">WA</span>&nbsp;<span class="postal-code">98052</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a><span class="email">henrikn@microsoft.com</span></a></span></address>
    899       <address class="vcard"><span class="vcardline"><span class="fn">Larry Masinter</span><span class="n hidden"><span class="family-name">Masinter</span><span class="given-name">Larry</span></span></span><span class="org vcardline">Adobe Systems, Incorporated</span><span class="adr"><span class="street-address vcardline">345 Park Ave</span><span class="vcardline"><span class="locality">San Jose</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">95110</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a><span class="email">LMM@acm.org</span></a></span><span class="vcardline">URI: <a href="http://larry.masinter.net/" class="url">http://larry.masinter.net/</a></span></address>
    900       <address class="vcard"><span class="vcardline"><span class="fn">Paul J. Leach</span><span class="n hidden"><span class="family-name">Leach</span><span class="given-name">Paul J.</span></span></span><span class="org vcardline">Microsoft Corporation</span><span class="adr"><span class="street-address vcardline">1 Microsoft Way</span><span class="vcardline"><span class="locality">Redmond</span>, <span class="region">WA</span>&nbsp;<span class="postal-code">98052</span></span></span><span class="vcardline">EMail: <a><span class="email">paulle@microsoft.com</span></a></span></address>
    901       <address class="vcard"><span class="vcardline"><span class="fn">Tim Berners-Lee</span><span class="n hidden"><span class="family-name">Berners-Lee</span><span class="given-name">Tim</span></span></span><span class="org vcardline">World Wide Web Consortium</span><span class="adr"><span class="street-address vcardline">MIT Computer Science and Artificial Intelligence Laboratory</span><span class="street-address vcardline">The Stata Center, Building 32</span><span class="street-address vcardline">32 Vassar Street</span><span class="vcardline"><span class="locality">Cambridge</span>, <span class="region">MA</span>&nbsp;<span class="postal-code">02139</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a><span class="email">timbl@w3.org</span></a></span><span class="vcardline">URI: <a href="http://www.w3.org/People/Berners-Lee/" class="url">http://www.w3.org/People/Berners-Lee/</a></span></address>
     882      <div class="avoidbreak">
     883         <h1 id="rfc.authors"><a href="#rfc.authors">Authors' Addresses</a></h1>
     884         <address class="vcard"><span class="vcardline"><span class="fn">Roy T. Fielding</span>
     885               (editor)
     886               <span class="n hidden"><span class="family-name">Fielding</span><span class="given-name">Roy T.</span></span></span><span class="org vcardline">Day Software</span><span class="adr"><span class="street-address vcardline">23 Corporate Plaza DR, Suite 280</span><span class="vcardline"><span class="locality">Newport Beach</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">92660</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline tel">Phone: <a href="tel:+1-949-706-5300"><span class="value">+1-949-706-5300</span></a></span><span class="vcardline tel"><span class="type">Fax</span>: <a href="fax:+1-949-706-5305"><span class="value">+1-949-706-5305</span></a></span><span class="vcardline">EMail: <a href="mailto:fielding@gbiv.com"><span class="email">fielding@gbiv.com</span></a></span><span class="vcardline">URI: <a href="http://roy.gbiv.com/" class="url">http://roy.gbiv.com/</a></span></address>
     887         <address class="vcard"><span class="vcardline"><span class="fn">Jim Gettys</span><span class="n hidden"><span class="family-name">Gettys</span><span class="given-name">Jim</span></span></span><span class="org vcardline">One Laptop per Child</span><span class="adr"><span class="street-address vcardline">21 Oak Knoll Road</span><span class="vcardline"><span class="locality">Carlisle</span>, <span class="region">MA</span>&nbsp;<span class="postal-code">01741</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a href="mailto:jg@laptop.org"><span class="email">jg@laptop.org</span></a></span><span class="vcardline">URI: <a href="http://www.laptop.org/" class="url">http://www.laptop.org/</a></span></address>
     888         <address class="vcard"><span class="vcardline"><span class="fn">Jeffrey C. Mogul</span><span class="n hidden"><span class="family-name">Mogul</span><span class="given-name">Jeffrey C.</span></span></span><span class="org vcardline">Hewlett-Packard Company</span><span class="adr"><span class="street-address vcardline">HP Labs, Large Scale Systems Group</span><span class="street-address vcardline">1501 Page Mill Road, MS 1177</span><span class="vcardline"><span class="locality">Palo Alto</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">94304</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a href="mailto:JeffMogul@acm.org"><span class="email">JeffMogul@acm.org</span></a></span></address>
     889         <address class="vcard"><span class="vcardline"><span class="fn">Henrik Frystyk Nielsen</span><span class="n hidden"><span class="family-name">Frystyk</span></span></span><span class="org vcardline">Microsoft Corporation</span><span class="adr"><span class="street-address vcardline">1 Microsoft Way</span><span class="vcardline"><span class="locality">Redmond</span>, <span class="region">WA</span>&nbsp;<span class="postal-code">98052</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a href="mailto:henrikn@microsoft.com"><span class="email">henrikn@microsoft.com</span></a></span></address>
     890         <address class="vcard"><span class="vcardline"><span class="fn">Larry Masinter</span><span class="n hidden"><span class="family-name">Masinter</span><span class="given-name">Larry</span></span></span><span class="org vcardline">Adobe Systems, Incorporated</span><span class="adr"><span class="street-address vcardline">345 Park Ave</span><span class="vcardline"><span class="locality">San Jose</span>, <span class="region">CA</span>&nbsp;<span class="postal-code">95110</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a href="mailto:LMM@acm.org"><span class="email">LMM@acm.org</span></a></span><span class="vcardline">URI: <a href="http://larry.masinter.net/" class="url">http://larry.masinter.net/</a></span></address>
     891         <address class="vcard"><span class="vcardline"><span class="fn">Paul J. Leach</span><span class="n hidden"><span class="family-name">Leach</span><span class="given-name">Paul J.</span></span></span><span class="org vcardline">Microsoft Corporation</span><span class="adr"><span class="street-address vcardline">1 Microsoft Way</span><span class="vcardline"><span class="locality">Redmond</span>, <span class="region">WA</span>&nbsp;<span class="postal-code">98052</span></span></span><span class="vcardline">EMail: <a href="mailto:paulle@microsoft.com"><span class="email">paulle@microsoft.com</span></a></span></address>
     892         <address class="vcard"><span class="vcardline"><span class="fn">Tim Berners-Lee</span><span class="n hidden"><span class="family-name">Berners-Lee</span><span class="given-name">Tim</span></span></span><span class="org vcardline">World Wide Web Consortium</span><span class="adr"><span class="street-address vcardline">MIT Computer Science and Artificial Intelligence Laboratory</span><span class="street-address vcardline">The Stata Center, Building 32</span><span class="street-address vcardline">32 Vassar Street</span><span class="vcardline"><span class="locality">Cambridge</span>, <span class="region">MA</span>&nbsp;<span class="postal-code">02139</span></span><span class="country-name vcardline">USA</span></span><span class="vcardline">EMail: <a href="mailto:timbl@w3.org"><span class="email">timbl@w3.org</span></a></span><span class="vcardline">URI: <a href="http://www.w3.org/People/Berners-Lee/" class="url">http://www.w3.org/People/Berners-Lee/</a></span></address>
     893      </div>
     894      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
     895      <p class="noprint"><a href="#rfc.index.3">3</a> <a href="#rfc.index.4">4</a> <a href="#rfc.index.E">E</a> <a href="#rfc.index.G">G</a> <a href="#rfc.index.H">H</a> <a href="#rfc.index.I">I</a> <a href="#rfc.index.L">L</a> <a href="#rfc.index.P">P</a> <a href="#rfc.index.R">R</a> <a href="#rfc.index.S">S</a>
     896      </p>
     897      <div class="print2col">
     898         <ul class="ind">
     899            <li><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul>
     900                  <li>304 Not Modified (status code)&nbsp;&nbsp;<a href="#rfc.iref.3"><b>3.1</b></a></li>
     901               </ul>
     902            </li>
     903            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
     904                  <li>412 Precondition Failed (status code)&nbsp;&nbsp;<a href="#rfc.iref.4"><b>3.2</b></a></li>
     905               </ul>
     906            </li>
     907            <li><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul>
     908                  <li>ETag header&nbsp;&nbsp;<a href="#rfc.xref.header.etag.1">2</a>, <a href="#rfc.iref.e.1"><b>6.1</b></a></li>
     909               </ul>
     910            </li>
     911            <li><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul>
     912                  <li><tt>Grammar</tt>&nbsp;&nbsp;
     913                     <ul>
     914                        <li><tt>entity-tag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.1"><b>2</b></a></li>
     915                        <li><tt>ETag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>6.1</b></a></li>
     916                        <li><tt>If-Match</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>6.2</b></a></li>
     917                        <li><tt>If-Modified-Since</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>6.3</b></a></li>
     918                        <li><tt>If-None-Match</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>6.4</b></a></li>
     919                        <li><tt>If-Unmodified-Since</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>6.5</b></a></li>
     920                        <li><tt>Last-Modified</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>6.6</b></a></li>
     921                        <li><tt>opaque-tag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>2</b></a></li>
     922                        <li><tt>weak</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>2</b></a></li>
     923                     </ul>
     924                  </li>
     925               </ul>
     926            </li>
     927            <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul>
     928                  <li>Headers&nbsp;&nbsp;
     929                     <ul>
     930                        <li>ETag&nbsp;&nbsp;<a href="#rfc.xref.header.etag.1">2</a>, <a href="#rfc.iref.h.1"><b>6.1</b></a></li>
     931                        <li>If-Match&nbsp;&nbsp;<a href="#rfc.xref.header.if-match.1">2</a>, <a href="#rfc.xref.header.if-match.2">6.1</a>, <a href="#rfc.iref.h.2"><b>6.2</b></a></li>
     932                        <li>If-Modified-Since&nbsp;&nbsp;<a href="#rfc.iref.h.3"><b>6.3</b></a></li>
     933                        <li>If-None-Match&nbsp;&nbsp;<a href="#rfc.xref.header.if-none-match.1">2</a>, <a href="#rfc.xref.header.if-none-match.2">6.1</a>, <a href="#rfc.iref.h.4"><b>6.4</b></a></li>
     934                        <li>If-Unmodified-Since&nbsp;&nbsp;<a href="#rfc.iref.h.5"><b>6.5</b></a></li>
     935                        <li>Last-Modified&nbsp;&nbsp;<a href="#rfc.iref.h.6"><b>6.6</b></a></li>
     936                     </ul>
     937                  </li>
     938               </ul>
     939            </li>
     940            <li><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul>
     941                  <li>If-Match header&nbsp;&nbsp;<a href="#rfc.xref.header.if-match.1">2</a>, <a href="#rfc.xref.header.if-match.2">6.1</a>, <a href="#rfc.iref.i.1"><b>6.2</b></a></li>
     942                  <li>If-Modified-Since header&nbsp;&nbsp;<a href="#rfc.iref.i.2"><b>6.3</b></a></li>
     943                  <li>If-None-Match header&nbsp;&nbsp;<a href="#rfc.xref.header.if-none-match.1">2</a>, <a href="#rfc.xref.header.if-none-match.2">6.1</a>, <a href="#rfc.iref.i.3"><b>6.4</b></a></li>
     944                  <li>If-Unmodified-Since header&nbsp;&nbsp;<a href="#rfc.iref.i.4"><b>6.5</b></a></li>
     945               </ul>
     946            </li>
     947            <li><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul>
     948                  <li>Last-Modified header&nbsp;&nbsp;<a href="#rfc.iref.l.1"><b>6.6</b></a></li>
     949               </ul>
     950            </li>
     951            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
     952                  <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">3.1</a>, <a href="#rfc.xref.Part1.2">8</a>, <a href="#Part1"><b>10</b></a><ul>
     953                        <li><em>Section 8.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">3.1</a></li>
     954                     </ul>
     955                  </li>
     956                  <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">2</a>, <a href="#rfc.xref.Part5.2">6.1</a>, <a href="#rfc.xref.Part5.3">6.3</a>, <a href="#Part5"><b>10</b></a><ul>
     957                        <li><em>Section 5.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">2</a>, <a href="#rfc.xref.Part5.2">6.1</a></li>
     958                        <li><em>Section 5.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.3">6.3</a></li>
     959                     </ul>
     960                  </li>
     961                  <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">3.1</a>, <a href="#rfc.xref.Part6.2">6.2</a>, <a href="#rfc.xref.Part6.3">6.4</a>, <a href="#Part6"><b>10</b></a><ul>
     962                        <li><em>Section 3.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.2">6.2</a>, <a href="#rfc.xref.Part6.3">6.4</a></li>
     963                     </ul>
     964                  </li>
     965               </ul>
     966            </li>
     967            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
     968                  <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">3.1</a>, <a href="#rfc.xref.RFC2068.2">3.1</a>, <a href="#RFC2068"><b>10</b></a><ul>
     969                        <li><em>Section 14.19</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">3.1</a></li>
     970                     </ul>
     971                  </li>
     972                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">§</a>, <a href="#rfc.xref.RFC2616.2">1</a>, <a href="#RFC2616"><b>10</b></a></li>
     973               </ul>
     974            </li>
     975            <li><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul>
     976                  <li>Status Codes&nbsp;&nbsp;
     977                     <ul>
     978                        <li>304 Not Modified&nbsp;&nbsp;<a href="#rfc.iref.s.1"><b>3.1</b></a></li>
     979                        <li>412 Precondition Failed&nbsp;&nbsp;<a href="#rfc.iref.s.2"><b>3.2</b></a></li>
     980                     </ul>
     981                  </li>
     982               </ul>
     983            </li>
     984         </ul>
     985      </div>
    902986      <h1><a id="rfc.copyright" href="#rfc.copyright">Full Copyright Statement</a></h1>
     987      <p>Copyright © The IETF Trust (2007).</p>
    903988      <p>This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the
    904989         authors retain all their rights.
    … …  
    9181003      <p>Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result
    9191004         of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users
    920          of this specification can be obtained from the IETF on-line IPR repository at &lt;<a href="http://www.ietf.org/ipr">http://www.ietf.org/ipr</a>&gt;.
     1005         of this specification can be obtained from the IETF on-line IPR repository at <a href="http://www.ietf.org/ipr">http://www.ietf.org/ipr</a>.
    9211006      </p>
    9221007      <p>The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary
    … …  
    9241009         at <a href="mailto:ietf-ipr@ietf.org">ietf-ipr@ietf.org</a>.
    9251010      </p>
    926       <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    927       <p class="noprint"><a href="#rfc.index.3">3</a> <a href="#rfc.index.4">4</a> <a href="#rfc.index.E">E</a> <a href="#rfc.index.G">G</a> <a href="#rfc.index.H">H</a> <a href="#rfc.index.I">I</a> <a href="#rfc.index.L">L</a> <a href="#rfc.index.P">P</a> <a href="#rfc.index.R">R</a> <a href="#rfc.index.S">S</a>
    928       </p>
    929       <div class="print2col">
    930          <ul class="ind">
    931             <li class="indline0"><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul class="ind">
    932                   <li class="indline1">304 Not Modified (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.iref.3"><b>3.1</b></a></li>
    933                </ul>
    934             </li>
    935             <li class="indline0"><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul class="ind">
    936                   <li class="indline1">412 Precondition Failed (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.iref.4"><b>3.2</b></a></li>
    937                </ul>
    938             </li>
    939             <li class="indline0"><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul class="ind">
    940                   <li class="indline1">ETag header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.etag.1">2</a>, <a class="iref" href="#rfc.iref.e.1"><b>6.1</b></a></li>
    941                </ul>
    942             </li>
    943             <li class="indline0"><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul class="ind">
    944                   <li class="indline1"><tt>Grammar</tt>&nbsp;&nbsp;
    945                      <ul class="ind">
    946                         <li class="indline1"><tt>entity-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.1"><b>2</b></a></li>
    947                         <li class="indline1"><tt>ETag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>6.1</b></a></li>
    948                         <li class="indline1"><tt>If-Match</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>6.2</b></a></li>
    949                         <li class="indline1"><tt>If-Modified-Since</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>6.3</b></a></li>
    950                         <li class="indline1"><tt>If-None-Match</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>6.4</b></a></li>
    951                         <li class="indline1"><tt>If-Unmodified-Since</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>6.5</b></a></li>
    952                         <li class="indline1"><tt>Last-Modified</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>6.6</b></a></li>
    953                         <li class="indline1"><tt>opaque-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3"><b>2</b></a></li>
    954                         <li class="indline1"><tt>weak</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>2</b></a></li>
    955                      </ul>
    956                   </li>
    957                </ul>
    958             </li>
    959             <li class="indline0"><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul class="ind">
    960                   <li class="indline1">Headers&nbsp;&nbsp;
    961                      <ul class="ind">
    962                         <li class="indline1">ETag&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.etag.1">2</a>, <a class="iref" href="#rfc.iref.h.1"><b>6.1</b></a></li>
    963                         <li class="indline1">If-Match&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-match.1">2</a>, <a class="iref" href="#rfc.xref.header.if-match.2">6.1</a>, <a class="iref" href="#rfc.iref.h.2"><b>6.2</b></a></li>
    964                         <li class="indline1">If-Modified-Since&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.3"><b>6.3</b></a></li>
    965                         <li class="indline1">If-None-Match&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-none-match.1">2</a>, <a class="iref" href="#rfc.xref.header.if-none-match.2">6.1</a>, <a class="iref" href="#rfc.iref.h.4"><b>6.4</b></a></li>
    966                         <li class="indline1">If-Unmodified-Since&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.5"><b>6.5</b></a></li>
    967                         <li class="indline1">Last-Modified&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.6"><b>6.6</b></a></li>
    968                      </ul>
    969                   </li>
    970                </ul>
    971             </li>
    972             <li class="indline0"><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul class="ind">
    973                   <li class="indline1">If-Match header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-match.1">2</a>, <a class="iref" href="#rfc.xref.header.if-match.2">6.1</a>, <a class="iref" href="#rfc.iref.i.1"><b>6.2</b></a></li>
    974                   <li class="indline1">If-Modified-Since header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.2"><b>6.3</b></a></li>
    975                   <li class="indline1">If-None-Match header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-none-match.1">2</a>, <a class="iref" href="#rfc.xref.header.if-none-match.2">6.1</a>, <a class="iref" href="#rfc.iref.i.3"><b>6.4</b></a></li>
    976                   <li class="indline1">If-Unmodified-Since header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.4"><b>6.5</b></a></li>
    977                </ul>
    978             </li>
    979             <li class="indline0"><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul class="ind">
    980                   <li class="indline1">Last-Modified header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.l.1"><b>6.6</b></a></li>
    981                </ul>
    982             </li>
    983             <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind">
    984                   <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">3.1</a>, <a class="iref" href="#rfc.xref.Part1.2">8</a>, <a class="iref" href="#Part1"><b>10</b></a><ul class="ind">
    985                         <li class="indline1"><em>Section 8.3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">3.1</a></li>
    986                      </ul>
    987                   </li>
    988                   <li class="indline1"><em>Part5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">2</a>, <a class="iref" href="#rfc.xref.Part5.2">6.1</a>, <a class="iref" href="#rfc.xref.Part5.3">6.3</a>, <a class="iref" href="#Part5"><b>10</b></a><ul class="ind">
    989                         <li class="indline1"><em>Section 5.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">2</a>, <a class="iref" href="#rfc.xref.Part5.2">6.1</a></li>
    990                         <li class="indline1"><em>Section 5.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.3">6.3</a></li>
    991                      </ul>
    992                   </li>
    993                   <li class="indline1"><em>Part6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">3.1</a>, <a class="iref" href="#rfc.xref.Part6.2">6.2</a>, <a class="iref" href="#rfc.xref.Part6.3">6.4</a>, <a class="iref" href="#Part6"><b>10</b></a><ul class="ind">
    994                         <li class="indline1"><em>Section 3.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.2">6.2</a>, <a class="iref" href="#rfc.xref.Part6.3">6.4</a></li>
    995                      </ul>
    996                   </li>
    997                </ul>
    998             </li>
    999             <li class="indline0"><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul class="ind">
    1000                   <li class="indline1"><em>RFC2068</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.1">3.1</a>, <a class="iref" href="#rfc.xref.RFC2068.2">3.1</a>, <a class="iref" href="#RFC2068"><b>10</b></a><ul class="ind">
    1001                         <li class="indline1"><em>Section 14.19</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.2">3.1</a></li>
    1002                      </ul>
    1003                   </li>
    1004                   <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">§</a>, <a class="iref" href="#rfc.xref.RFC2616.2">1</a>, <a class="iref" href="#RFC2616"><b>10</b></a></li>
    1005                </ul>
    1006             </li>
    1007             <li class="indline0"><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul class="ind">
    1008                   <li class="indline1">Status Codes&nbsp;&nbsp;
    1009                      <ul class="ind">
    1010                         <li class="indline1">304 Not Modified&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.1"><b>3.1</b></a></li>
    1011                         <li class="indline1">412 Precondition Failed&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.2"><b>3.2</b></a></li>
    1012                      </ul>
    1013                   </li>
    1014                </ul>
    1015             </li>
    1016          </ul>
    1017       </div>
    10181011   </body>
    10191012</html>
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