Ignore:
Timestamp:
01/01/11 17:23:02 (9 years ago)
Author:
julian.reschke@…
Message:

bump up document dates, update to latest version of rfc2629.xslt

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1 edited

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  • draft-ietf-httpbis/05/p4-conditional.html

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    377385      <link rel="Appendix" title="A Compatibility with Previous Versions" href="#rfc.section.A">
    378386      <link rel="Appendix" title="B Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.B">
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    380       <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/">
    381       <meta name="DC.Creator" content="Fielding, R.">
    382       <meta name="DC.Creator" content="Gettys, J.">
    383       <meta name="DC.Creator" content="Mogul, J.">
    384       <meta name="DC.Creator" content="Frystyk, H.">
    385       <meta name="DC.Creator" content="Masinter, L.">
    386       <meta name="DC.Creator" content="Leach, P.">
    387       <meta name="DC.Creator" content="Berners-Lee, T.">
    388       <meta name="DC.Creator" content="Lafon, Y.">
    389       <meta name="DC.Creator" content="Reschke, J. F.">
    390       <meta name="DC.Identifier" content="urn:ietf:id:draft-ietf-httpbis-p4-conditional-05">
    391       <meta name="DC.Date.Issued" scheme="ISO8601" content="2008-11">
    392       <meta name="DC.Relation.Replaces" content="urn:ietf:rfc:2616">
    393       <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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     388      <link rel="schema.dct" href="http://purl.org/dc/terms/">
     389      <meta name="dct.creator" content="Fielding, R.">
     390      <meta name="dct.creator" content="Gettys, J.">
     391      <meta name="dct.creator" content="Mogul, J.">
     392      <meta name="dct.creator" content="Frystyk, H.">
     393      <meta name="dct.creator" content="Masinter, L.">
     394      <meta name="dct.creator" content="Leach, P.">
     395      <meta name="dct.creator" content="Berners-Lee, T.">
     396      <meta name="dct.creator" content="Lafon, Y.">
     397      <meta name="dct.creator" content="Reschke, J. F.">
     398      <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p4-conditional-05">
     399      <meta name="dct.issued" scheme="ISO8601" content="2008-11-16">
     400      <meta name="dct.replaces" content="urn:ietf:rfc:2616">
     401      <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.">
     402      <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.">
    394403   </head>
    395404   <body>
    396       <table summary="header information" class="header" border="0" cellpadding="1" cellspacing="1">
    397          <tr>
    398             <td class="header left">Network Working Group</td>
    399             <td class="header right">R. Fielding, Editor</td>
    400          </tr>
    401          <tr>
    402             <td class="header left">Internet Draft</td>
    403             <td class="header right">Day Software</td>
    404          </tr>
    405          <tr>
    406             <td class="header left">
    407                &lt;draft-ietf-httpbis-p4-conditional-05&gt;
    408                
    409             </td>
    410             <td class="header right">J. Gettys</td>
    411          </tr>
    412          <tr>
    413             <td class="header left">Obsoletes: <a href="http://tools.ietf.org/html/rfc2616">2616</a> (if approved)
    414             </td>
    415             <td class="header right">One Laptop per Child</td>
    416          </tr>
    417          <tr>
    418             <td class="header left">Intended status: Standards Track</td>
    419             <td class="header right">J. Mogul</td>
    420          </tr>
    421          <tr>
    422             <td class="header left">Expires: May 2009</td>
    423             <td class="header right">HP</td>
    424          </tr>
    425          <tr>
    426             <td class="header left"></td>
    427             <td class="header right">H. Frystyk</td>
    428          </tr>
    429          <tr>
    430             <td class="header left"></td>
    431             <td class="header right">Microsoft</td>
    432          </tr>
    433          <tr>
    434             <td class="header left"></td>
    435             <td class="header right">L. Masinter</td>
    436          </tr>
    437          <tr>
    438             <td class="header left"></td>
    439             <td class="header right">Adobe Systems</td>
    440          </tr>
    441          <tr>
    442             <td class="header left"></td>
    443             <td class="header right">P. Leach</td>
    444          </tr>
    445          <tr>
    446             <td class="header left"></td>
    447             <td class="header right">Microsoft</td>
    448          </tr>
    449          <tr>
    450             <td class="header left"></td>
    451             <td class="header right">T. Berners-Lee</td>
    452          </tr>
    453          <tr>
    454             <td class="header left"></td>
    455             <td class="header right">W3C/MIT</td>
    456          </tr>
    457          <tr>
    458             <td class="header left"></td>
    459             <td class="header right">Y. Lafon, Editor</td>
    460          </tr>
    461          <tr>
    462             <td class="header left"></td>
    463             <td class="header right">W3C</td>
    464          </tr>
    465          <tr>
    466             <td class="header left"></td>
    467             <td class="header right">J. F. Reschke, Editor</td>
    468          </tr>
    469          <tr>
    470             <td class="header left"></td>
    471             <td class="header right">greenbytes</td>
    472          </tr>
    473          <tr>
    474             <td class="header left"></td>
    475             <td class="header right">November 16, 2008</td>
    476          </tr>
     405      <table class="header">
     406         <tbody>
     407            <tr>
     408               <td class="left">Network Working Group</td>
     409               <td class="right">R. Fielding, Editor</td>
     410            </tr>
     411            <tr>
     412               <td class="left">Internet-Draft</td>
     413               <td class="right">Day Software</td>
     414            </tr>
     415            <tr>
     416               <td class="left">Obsoletes: <a href="http://tools.ietf.org/html/rfc2616">2616</a> (if approved)
     417               </td>
     418               <td class="right">J. Gettys</td>
     419            </tr>
     420            <tr>
     421               <td class="left">Intended status: Standards Track</td>
     422               <td class="right">One Laptop per Child</td>
     423            </tr>
     424            <tr>
     425               <td class="left">Expires: May 20, 2009</td>
     426               <td class="right">J. Mogul</td>
     427            </tr>
     428            <tr>
     429               <td class="left"></td>
     430               <td class="right">HP</td>
     431            </tr>
     432            <tr>
     433               <td class="left"></td>
     434               <td class="right">H. Frystyk</td>
     435            </tr>
     436            <tr>
     437               <td class="left"></td>
     438               <td class="right">Microsoft</td>
     439            </tr>
     440            <tr>
     441               <td class="left"></td>
     442               <td class="right">L. Masinter</td>
     443            </tr>
     444            <tr>
     445               <td class="left"></td>
     446               <td class="right">Adobe Systems</td>
     447            </tr>
     448            <tr>
     449               <td class="left"></td>
     450               <td class="right">P. Leach</td>
     451            </tr>
     452            <tr>
     453               <td class="left"></td>
     454               <td class="right">Microsoft</td>
     455            </tr>
     456            <tr>
     457               <td class="left"></td>
     458               <td class="right">T. Berners-Lee</td>
     459            </tr>
     460            <tr>
     461               <td class="left"></td>
     462               <td class="right">W3C/MIT</td>
     463            </tr>
     464            <tr>
     465               <td class="left"></td>
     466               <td class="right">Y. Lafon, Editor</td>
     467            </tr>
     468            <tr>
     469               <td class="left"></td>
     470               <td class="right">W3C</td>
     471            </tr>
     472            <tr>
     473               <td class="left"></td>
     474               <td class="right">J. Reschke, Editor</td>
     475            </tr>
     476            <tr>
     477               <td class="left"></td>
     478               <td class="right">greenbytes</td>
     479            </tr>
     480            <tr>
     481               <td class="left"></td>
     482               <td class="right">November 16, 2008</td>
     483            </tr>
     484         </tbody>
    477485      </table>
    478486      <p class="title">HTTP/1.1, part 4: Conditional Requests<br><span class="filename">draft-ietf-httpbis-p4-conditional-05</span></p>
     
    489497         in progress”.
    490498      </p>
    491       <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;.
    492       </p>
    493       <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;.
    494       </p>
    495       <p>This Internet-Draft will expire in May 2009.</p>
     499      <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>.
     500      </p>
     501      <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>.
     502      </p>
     503      <p>This Internet-Draft will expire on May 20, 2009.</p>
    496504      <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
    497505      <p>The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
     
    509517      <h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1>
    510518      <ul class="toc">
    511          <li class="tocline0">1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a><ul class="toc">
    512                <li class="tocline1">1.1&nbsp;&nbsp;&nbsp;<a href="#intro.requirements">Requirements</a></li>
     519         <li>1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a><ul>
     520               <li>1.1&nbsp;&nbsp;&nbsp;<a href="#intro.requirements">Requirements</a></li>
    513521            </ul>
    514522         </li>
    515          <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#notation">Notational Conventions and Generic Grammar</a></li>
    516          <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#entity.tags">Entity Tags</a></li>
    517          <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#rfc.section.4">Status Code Definitions</a><ul class="toc">
    518                <li class="tocline1">4.1&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
    519                <li class="tocline1">4.2&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
     523         <li>2.&nbsp;&nbsp;&nbsp;<a href="#notation">Notational Conventions and Generic Grammar</a></li>
     524         <li>3.&nbsp;&nbsp;&nbsp;<a href="#entity.tags">Entity Tags</a></li>
     525         <li>4.&nbsp;&nbsp;&nbsp;<a href="#rfc.section.4">Status Code Definitions</a><ul>
     526               <li>4.1&nbsp;&nbsp;&nbsp;<a href="#status.304">304 Not Modified</a></li>
     527               <li>4.2&nbsp;&nbsp;&nbsp;<a href="#status.412">412 Precondition Failed</a></li>
    520528            </ul>
    521529         </li>
    522          <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#weak.and.strong.validators">Weak and Strong Validators</a></li>
    523          <li class="tocline0">6.&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>
    524          <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
    525                <li class="tocline1">7.1&nbsp;&nbsp;&nbsp;<a href="#header.etag">ETag</a></li>
    526                <li class="tocline1">7.2&nbsp;&nbsp;&nbsp;<a href="#header.if-match">If-Match</a></li>
    527                <li class="tocline1">7.3&nbsp;&nbsp;&nbsp;<a href="#header.if-modified-since">If-Modified-Since</a></li>
    528                <li class="tocline1">7.4&nbsp;&nbsp;&nbsp;<a href="#header.if-none-match">If-None-Match</a></li>
    529                <li class="tocline1">7.5&nbsp;&nbsp;&nbsp;<a href="#header.if-unmodified-since">If-Unmodified-Since</a></li>
    530                <li class="tocline1">7.6&nbsp;&nbsp;&nbsp;<a href="#header.last-modified">Last-Modified</a></li>
     530         <li>5.&nbsp;&nbsp;&nbsp;<a href="#weak.and.strong.validators">Weak and Strong Validators</a></li>
     531         <li>6.&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>
     532         <li>7.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul>
     533               <li>7.1&nbsp;&nbsp;&nbsp;<a href="#header.etag">ETag</a></li>
     534               <li>7.2&nbsp;&nbsp;&nbsp;<a href="#header.if-match">If-Match</a></li>
     535               <li>7.3&nbsp;&nbsp;&nbsp;<a href="#header.if-modified-since">If-Modified-Since</a></li>
     536               <li>7.4&nbsp;&nbsp;&nbsp;<a href="#header.if-none-match">If-None-Match</a></li>
     537               <li>7.5&nbsp;&nbsp;&nbsp;<a href="#header.if-unmodified-since">If-Unmodified-Since</a></li>
     538               <li>7.6&nbsp;&nbsp;&nbsp;<a href="#header.last-modified">Last-Modified</a></li>
    531539            </ul>
    532540         </li>
    533          <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul class="toc">
    534                <li class="tocline1">8.1&nbsp;&nbsp;&nbsp;<a href="#message.header.registration">Message Header Registration</a></li>
     541         <li>8.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a><ul>
     542               <li>8.1&nbsp;&nbsp;&nbsp;<a href="#message.header.registration">Message Header Registration</a></li>
    535543            </ul>
    536544         </li>
    537          <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
    538          <li class="tocline0">10.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
    539          <li class="tocline0">11.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul class="toc">
    540                <li class="tocline1">11.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    541                <li class="tocline1">11.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     545         <li>9.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
     546         <li>10.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
     547         <li>11.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
     548               <li>11.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     549               <li>11.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    542550            </ul>
    543551         </li>
    544          <li class="tocline0"><a href="#rfc.authors">Authors' Addresses</a></li>
    545          <li class="tocline0">A.&nbsp;&nbsp;&nbsp;<a href="#compatibility">Compatibility with Previous Versions</a><ul class="toc">
    546                <li class="tocline1">A.1&nbsp;&nbsp;&nbsp;<a href="#changes.from.rfc.2616">Changes from RFC 2616</a></li>
     552         <li><a href="#rfc.authors">Authors' Addresses</a></li>
     553         <li>A.&nbsp;&nbsp;&nbsp;<a href="#compatibility">Compatibility with Previous Versions</a><ul>
     554               <li>A.1&nbsp;&nbsp;&nbsp;<a href="#changes.from.rfc.2616">Changes from RFC 2616</a></li>
    547555            </ul>
    548556         </li>
    549          <li class="tocline0">B.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul class="toc">
    550                <li class="tocline1">B.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.1">Since RFC2616</a></li>
    551                <li class="tocline1">B.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.2">Since draft-ietf-httpbis-p4-conditional-00</a></li>
    552                <li class="tocline1">B.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.3">Since draft-ietf-httpbis-p4-conditional-01</a></li>
    553                <li class="tocline1">B.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p4-conditional-02</a></li>
    554                <li class="tocline1">B.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p4-conditional-03</a></li>
    555                <li class="tocline1">B.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p4-conditional-04</a></li>
     557         <li>B.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul>
     558               <li>B.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.1">Since RFC2616</a></li>
     559               <li>B.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.2">Since draft-ietf-httpbis-p4-conditional-00</a></li>
     560               <li>B.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.B.3">Since draft-ietf-httpbis-p4-conditional-01</a></li>
     561               <li>B.4&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-p4-conditional-02</a></li>
     562               <li>B.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-p4-conditional-03</a></li>
     563               <li>B.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-p4-conditional-04</a></li>
    556564            </ul>
    557565         </li>
    558          <li class="tocline0"><a href="#rfc.ipr">Intellectual Property and Copyright Statements</a></li>
    559          <li class="tocline0"><a href="#rfc.index">Index</a></li>
     566         <li><a href="#rfc.index">Index</a></li>
     567         <li><a href="#rfc.ipr">Intellectual Property and Copyright Statements</a></li>
    560568      </ul>
    561569      <h1 id="rfc.section.1" class="np"><a href="#rfc.section.1">1.</a>&nbsp;<a id="introduction" href="#introduction">Introduction</a></h1>
     
    656664         entity, while a weak validator is part of an identifier for a set of semantically equivalent entities.
    657665      </p>
    658       <dl class="empty">
    659          <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.
    660          </dd>
    661          <dd>An entity's modification time, if represented with one-second resolution, could be a weak validator, since it is possible
     666      <ul class="empty">
     667         <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.
     668         </li>
     669         <li>An entity's modification time, if represented with one-second resolution, could be a weak validator, since it is possible
    662670            that the resource might be modified twice during a single second.
    663          </dd>
    664          <dd>Support for weak validators is optional. However, weak validators allow for more efficient caching of equivalent objects;
     671         </li>
     672         <li>Support for weak validators is optional. However, weak validators allow for more efficient caching of equivalent objects;
    665673            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
    666674            that period is likely "good enough" to be equivalent.
    667          </dd>
    668       </dl>
     675         </li>
     676      </ul>
    669677      <p id="rfc.section.5.p.4">A "use" of a validator is either when a client generates a request and includes the validator in a validating header field,
    670678         or when a server compares two validators.
     
    687695      <p id="rfc.section.5.p.8">The example below shows the results for a set of entity tag pairs, and both the weak and strong comparison function results:</p>
    688696      <div id="rfc.table.u.1">
    689          <table summary="" class="tt full" cellpadding="3" cellspacing="0">
     697         <table class="tt full left" cellpadding="3" cellspacing="0">
    690698            <thead>
    691699               <tr>
     
    698706            <tbody>
    699707               <tr>
    700                   <td>W/"1"</td>
    701                   <td>W/"1"</td>
    702                   <td>no match</td>
    703                   <td>match</td>
     708                  <td class="left">W/"1"</td>
     709                  <td class="left">W/"1"</td>
     710                  <td class="left">no match</td>
     711                  <td class="left">match</td>
    704712               </tr>
    705713               <tr>
    706                   <td>W/"1"</td>
    707                   <td>W/"2"</td>
    708                   <td>no match</td>
    709                   <td>no match</td>
     714                  <td class="left">W/"1"</td>
     715                  <td class="left">W/"2"</td>
     716                  <td class="left">no match</td>
     717                  <td class="left">no match</td>
    710718               </tr>
    711719               <tr>
    712                   <td>W/"1"</td>
    713                   <td>"1"</td>
    714                   <td>no match</td>
    715                   <td>match</td>
     720                  <td class="left">W/"1"</td>
     721                  <td class="left">"1"</td>
     722                  <td class="left">no match</td>
     723                  <td class="left">match</td>
    716724               </tr>
    717725               <tr>
    718                   <td>"1"</td>
    719                   <td>"1"</td>
    720                   <td>match</td>
    721                   <td>match</td>
     726                  <td class="left">"1"</td>
     727                  <td class="left">"1"</td>
     728                  <td class="left">match</td>
     729                  <td class="left">match</td>
    722730               </tr>
    723731            </tbody>
     
    782790      <p id="rfc.section.6.p.4">In order to be legal, a strong entity tag <em class="bcp14">MUST</em> change whenever the associated entity changes in any way. A weak entity tag <em class="bcp14">SHOULD</em> change whenever the associated entity changes in a semantically significant way.
    783791      </p>
    784       <dl class="empty">
    785          <dd> <b>Note:</b> in order to provide semantically transparent caching, an origin server must avoid reusing a specific strong entity tag value
     792      <ul class="empty">
     793         <li> <b>Note:</b> in order to provide semantically transparent caching, an origin server must avoid reusing a specific strong entity tag value
    786794            for two different entities, or reusing a specific weak entity tag value for two semantically different entities. Cache entries
    787795            might persist for arbitrarily long periods, regardless of expiration times, so it might be inappropriate to expect that a
    788796            cache will never again attempt to validate an entry using a validator that it obtained at some point in the past.
    789          </dd>
    790       </dl>
     797         </li>
     798      </ul>
    791799      <p id="rfc.section.6.p.5">HTTP/1.1 clients: </p>
    792800      <ul>
     
    809817         fields in the request.
    810818      </p>
    811       <dl class="empty">
    812          <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
     819      <ul class="empty">
     820         <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
    813821            as is available in their responses and requests. HTTP/1.1 systems receiving this information will make the most conservative
    814822            assumptions about the validators they receive.
    815          </dd>
    816          <dd>HTTP/1.0 clients and caches will ignore entity tags. Generally, last-modified values received or used by these systems will
     823         </li>
     824         <li>HTTP/1.0 clients and caches will ignore entity tags. Generally, last-modified values received or used by these systems will
    817825            support transparent and efficient caching, and so HTTP/1.1 origin servers should provide Last-Modified values. In those rare
    818826            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
    819827            HTTP/1.1 origin servers should not provide one.
    820          </dd>
    821       </dl>
     828         </li>
     829      </ul>
    822830      <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Field Definitions</a></h1>
    823831      <p id="rfc.section.7.p.1">This section defines the syntax and semantics of HTTP/1.1 header fields related to conditional requests.</p>
     
    906914      </ol>
    907915      <p id="rfc.section.7.3.p.6">The purpose of this feature is to allow efficient updates of cached information with a minimum amount of transaction overhead. </p>
    908       <dl class="empty">
    909          <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 6.4</a> of <a href="#Part5" id="rfc.xref.Part5.5"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> for full details.
    910          </dd>
    911          <dd> <b>Note:</b> If-Modified-Since times are interpreted by the server, whose clock might not be synchronized with the client.
    912          </dd>
    913          <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
     916      <ul class="empty">
     917         <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 6.4</a> of <a href="#Part5" id="rfc.xref.Part5.5"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> for full details.
     918         </li>
     919         <li> <b>Note:</b> If-Modified-Since times are interpreted by the server, whose clock might not be synchronized with the client.
     920         </li>
     921         <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
    914922            function, for deciding whether to send a 304 (Not Modified) response. To get best results when sending an If-Modified-Since
    915923            header field for cache validation, clients are advised to use the exact date string received in a previous Last-Modified header
    916924            field whenever possible.
    917          </dd>
    918          <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
     925         </li>
     926         <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
    919927            the same request, the client should be aware of the fact that this date is interpreted in the server's understanding of time.
    920928            The client should consider unsynchronized clocks and rounding problems due to the different encodings of time between the
     
    923931            If-Modified-Since date is derived from the client's clock without correction to the server's clock. Corrections for different
    924932            time bases between client and server are at best approximate due to network latency.
    925          </dd>
    926       </dl>
     933         </li>
     934      </ul>
    927935      <p id="rfc.section.7.3.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
    928936         fields is undefined by this specification.
     
    10171025      <div id="rfc.table.1">
    10181026         <div id="iana.header.registration.table"></div>
    1019          <table summary="" class="tt full" cellpadding="3" cellspacing="0">
     1027         <table class="tt full left" cellpadding="3" cellspacing="0">
    10201028            <thead>
    10211029               <tr>
     
    10281036            <tbody>
    10291037               <tr>
    1030                   <td>ETag</td>
    1031                   <td>http</td>
    1032                   <td>standard</td>
    1033                   <td> <a href="#header.etag" id="rfc.xref.header.etag.2" title="ETag">Section&nbsp;7.1</a>
     1038                  <td class="left">ETag</td>
     1039                  <td class="left">http</td>
     1040                  <td class="left">standard</td>
     1041                  <td class="left"> <a href="#header.etag" id="rfc.xref.header.etag.2" title="ETag">Section&nbsp;7.1</a>
    10341042                  </td>
    10351043               </tr>
    10361044               <tr>
    1037                   <td>If-Match</td>
    1038                   <td>http</td>
    1039                   <td>standard</td>
    1040                   <td> <a href="#header.if-match" id="rfc.xref.header.if-match.3" title="If-Match">Section&nbsp;7.2</a>
     1045                  <td class="left">If-Match</td>
     1046                  <td class="left">http</td>
     1047                  <td class="left">standard</td>
     1048                  <td class="left"> <a href="#header.if-match" id="rfc.xref.header.if-match.3" title="If-Match">Section&nbsp;7.2</a>
    10411049                  </td>
    10421050               </tr>
    10431051               <tr>
    1044                   <td>If-Modified-Since</td>
    1045                   <td>http</td>
    1046                   <td>standard</td>
    1047                   <td> <a href="#header.if-modified-since" id="rfc.xref.header.if-modified-since.1" title="If-Modified-Since">Section&nbsp;7.3</a>
     1052                  <td class="left">If-Modified-Since</td>
     1053                  <td class="left">http</td>
     1054                  <td class="left">standard</td>
     1055                  <td class="left"> <a href="#header.if-modified-since" id="rfc.xref.header.if-modified-since.1" title="If-Modified-Since">Section&nbsp;7.3</a>
    10481056                  </td>
    10491057               </tr>
    10501058               <tr>
    1051                   <td>If-None-Match</td>
    1052                   <td>http</td>
    1053                   <td>standard</td>
    1054                   <td> <a href="#header.if-none-match" id="rfc.xref.header.if-none-match.3" title="If-None-Match">Section&nbsp;7.4</a>
     1059                  <td class="left">If-None-Match</td>
     1060                  <td class="left">http</td>
     1061                  <td class="left">standard</td>
     1062                  <td class="left"> <a href="#header.if-none-match" id="rfc.xref.header.if-none-match.3" title="If-None-Match">Section&nbsp;7.4</a>
    10551063                  </td>
    10561064               </tr>
    10571065               <tr>
    1058                   <td>If-Unmodified-Since</td>
    1059                   <td>http</td>
    1060                   <td>standard</td>
    1061                   <td> <a href="#header.if-unmodified-since" id="rfc.xref.header.if-unmodified-since.1" title="If-Unmodified-Since">Section&nbsp;7.5</a>
     1066                  <td class="left">If-Unmodified-Since</td>
     1067                  <td class="left">http</td>
     1068                  <td class="left">standard</td>
     1069                  <td class="left"> <a href="#header.if-unmodified-since" id="rfc.xref.header.if-unmodified-since.1" title="If-Unmodified-Since">Section&nbsp;7.5</a>
    10621070                  </td>
    10631071               </tr>
    10641072               <tr>
    1065                   <td>Last-Modified</td>
    1066                   <td>http</td>
    1067                   <td>standard</td>
    1068                   <td> <a href="#header.last-modified" id="rfc.xref.header.last-modified.1" title="Last-Modified">Section&nbsp;7.6</a>
     1073                  <td class="left">Last-Modified</td>
     1074                  <td class="left">http</td>
     1075                  <td class="left">standard</td>
     1076                  <td class="left"> <a href="#header.last-modified" id="rfc.xref.header.last-modified.1" title="Last-Modified">Section&nbsp;7.6</a>
    10691077                  </td>
    10701078               </tr>
     
    10811089      <h2 id="rfc.references.1"><a href="#rfc.section.11.1" id="rfc.section.11.1">11.1</a> Normative References
    10821090      </h2>
    1083       <table summary="Normative References">       
     1091      <table>       
    10841092         <tr>
    10851093            <td class="reference"><b id="Part1">[Part1]</b></td>
    1086             <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>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-05">HTTP/1.1, part 1: URIs, Connections, and Message Parsing</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p1-messaging-05 (work in progress), November&nbsp;2008.
     1094            <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>, <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">Berners-Lee, T.</a>, <a href="mailto:ylafon@w3.org" title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a href="mailto:julian.reschke@greenbytes.de" title="greenbytes GmbH">J. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-05">HTTP/1.1, part 1: URIs, Connections, and Message Parsing</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p1-messaging-05 (work in progress), November&nbsp;2008.
    10871095            </td>
    10881096         </tr>
    10891097         <tr>
    10901098            <td class="reference"><b id="Part5">[Part5]</b></td>
    1091             <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>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-05">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-05 (work in progress), November&nbsp;2008.
     1099            <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>, <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">Berners-Lee, T.</a>, <a href="mailto:ylafon@w3.org" title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a href="mailto:julian.reschke@greenbytes.de" title="greenbytes GmbH">J. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-05">HTTP/1.1, part 5: Range Requests and Partial Responses</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p5-range-05 (work in progress), November&nbsp;2008.
    10921100            </td>
    10931101         </tr>
    10941102         <tr>
    10951103            <td class="reference"><b id="Part6">[Part6]</b></td>
    1096             <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>, <a title="World Wide Web Consortium">Berners-Lee, T.</a>, <a title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a title="greenbytes GmbH">J. F. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-05">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-05 (work in progress), November&nbsp;2008.
     1104            <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>, <a href="mailto:timbl@w3.org" title="World Wide Web Consortium">Berners-Lee, T.</a>, <a href="mailto:ylafon@w3.org" title="World Wide Web Consortium">Lafon, Y., Ed.</a>, and <a href="mailto:julian.reschke@greenbytes.de" title="greenbytes GmbH">J. Reschke, Ed.</a>, “<a href="http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-05">HTTP/1.1, part 6: Caching</a>”, Internet-Draft&nbsp;draft-ietf-httpbis-p6-cache-05 (work in progress), November&nbsp;2008.
    10971105            </td>
    10981106         </tr>
    10991107         <tr>
    11001108            <td class="reference"><b id="RFC2119">[RFC2119]</b></td>
    1101             <td class="top"><a title="Harvard University">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>”, BCP&nbsp;14, RFC&nbsp;2119, March&nbsp;1997.
     1109            <td class="top"><a href="mailto:sob@harvard.edu" title="Harvard University">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>”, BCP&nbsp;14, RFC&nbsp;2119, March&nbsp;1997.
    11021110            </td>
    11031111         </tr>
     
    11051113      <h2 id="rfc.references.2"><a href="#rfc.section.11.2" id="rfc.section.11.2">11.2</a> Informative References
    11061114      </h2>
    1107       <table summary="Informative References">   
     1115      <table>   
    11081116         <tr>
    11091117            <td class="reference"><b id="RFC2616">[RFC2616]</b></td>
    1110             <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.
     1118            <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.
    11111119            </td>
    11121120         </tr>
    11131121         <tr>
    11141122            <td class="reference"><b id="RFC3864">[RFC3864]</b></td>
    1115             <td class="top"><a title="Nine by Nine">Klyne, G.</a>, <a title="BEA Systems">Nottingham, M.</a>, and <a title="HP Labs">J. Mogul</a>, “<a href="http://tools.ietf.org/html/rfc3864">Registration Procedures for Message Header Fields</a>”, BCP&nbsp;90, RFC&nbsp;3864, September&nbsp;2004.
     1123            <td class="top"><a href="mailto:GK-IETF@ninebynine.org" title="Nine by Nine">Klyne, G.</a>, <a href="mailto:mnot@pobox.com" title="BEA Systems">Nottingham, M.</a>, and <a href="mailto:JeffMogul@acm.org" title="HP Labs">J. Mogul</a>, “<a href="http://tools.ietf.org/html/rfc3864">Registration Procedures for Message Header Fields</a>”, BCP&nbsp;90, RFC&nbsp;3864, September&nbsp;2004.
    11161124            </td>
    11171125         </tr>
    11181126      </table>
    1119       <h1 id="rfc.authors"><a href="#rfc.authors">Authors' Addresses</a></h1>
    1120       <address class="vcard"><span class="vcardline"><span class="fn">Roy T. Fielding</span>
    1121             (editor)
    1122             <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>
    1123       <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>
    1124       <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>
    1125       <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>
    1126       <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>
    1127       <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>
    1128       <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>
    1129       <address class="vcard"><span class="vcardline"><span class="fn">Yves Lafon</span>
    1130             (editor)
    1131             <span class="n hidden"><span class="family-name">Lafon</span><span class="given-name">Yves</span></span></span><span class="org vcardline">World Wide Web Consortium</span><span class="adr"><span class="street-address vcardline">W3C / ERCIM</span><span class="street-address vcardline">2004, rte des Lucioles</span><span class="vcardline"><span class="locality">Sophia-Antipolis</span>, <span class="region">AM</span>&nbsp;<span class="postal-code">06902</span></span><span class="country-name vcardline">France</span></span><span class="vcardline">EMail: <a><span class="email">ylafon@w3.org</span></a></span><span class="vcardline">URI: <a href="http://www.raubacapeu.net/people/yves/" class="url">http://www.raubacapeu.net/people/yves/</a></span></address>
    1132       <address class="vcard"><span class="vcardline"><span class="fn">Julian F. Reschke</span>
    1133             (editor)
    1134             <span class="n hidden"><span class="family-name">Reschke</span><span class="given-name">Julian F.</span></span></span><span class="org vcardline">greenbytes GmbH</span><span class="adr"><span class="street-address vcardline">Hafenweg 16</span><span class="vcardline"><span class="locality">Muenster</span>, <span class="region">NW</span>&nbsp;<span class="postal-code">48155</span></span><span class="country-name vcardline">Germany</span></span><span class="vcardline tel">Phone: <a href="tel:+492512807760"><span class="value">+49 251 2807760</span></a></span><span class="vcardline tel"><span class="type">Fax</span>: <a href="fax:+492512807761"><span class="value">+49 251 2807761</span></a></span><span class="vcardline">EMail: <a><span class="email">julian.reschke@greenbytes.de</span></a></span><span class="vcardline">URI: <a href="http://greenbytes.de/tech/webdav/" class="url">http://greenbytes.de/tech/webdav/</a></span></address>
    1135       <h1 id="rfc.section.A"><a href="#rfc.section.A">A.</a>&nbsp;<a id="compatibility" href="#compatibility">Compatibility with Previous Versions</a></h1>
     1127      <div class="avoidbreak">
     1128         <h1 id="rfc.authors"><a href="#rfc.authors">Authors' Addresses</a></h1>
     1129         <address class="vcard"><span class="vcardline"><span class="fn">Roy T. Fielding</span>
     1130               (editor)
     1131               <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>
     1132         <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>
     1133         <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>
     1134         <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>
     1135         <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>
     1136         <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>
     1137         <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>
     1138         <address class="vcard"><span class="vcardline"><span class="fn">Yves Lafon</span>
     1139               (editor)
     1140               <span class="n hidden"><span class="family-name">Lafon</span><span class="given-name">Yves</span></span></span><span class="org vcardline">World Wide Web Consortium</span><span class="adr"><span class="street-address vcardline">W3C / ERCIM</span><span class="street-address vcardline">2004, rte des Lucioles</span><span class="vcardline"><span class="locality">Sophia-Antipolis</span>, <span class="region">AM</span>&nbsp;<span class="postal-code">06902</span></span><span class="country-name vcardline">France</span></span><span class="vcardline">EMail: <a href="mailto:ylafon@w3.org"><span class="email">ylafon@w3.org</span></a></span><span class="vcardline">URI: <a href="http://www.raubacapeu.net/people/yves/" class="url">http://www.raubacapeu.net/people/yves/</a></span></address>
     1141         <address class="vcard"><span class="vcardline"><span class="fn">Julian F. Reschke</span>
     1142               (editor)
     1143               <span class="n hidden"><span class="family-name">Reschke</span><span class="given-name">Julian F.</span></span></span><span class="org vcardline">greenbytes GmbH</span><span class="adr"><span class="street-address vcardline">Hafenweg 16</span><span class="vcardline"><span class="locality">Muenster</span>, <span class="region">NW</span>&nbsp;<span class="postal-code">48155</span></span><span class="country-name vcardline">Germany</span></span><span class="vcardline tel">Phone: <a href="tel:+492512807760"><span class="value">+49 251 2807760</span></a></span><span class="vcardline tel"><span class="type">Fax</span>: <a href="fax:+492512807761"><span class="value">+49 251 2807761</span></a></span><span class="vcardline">EMail: <a href="mailto:julian.reschke@greenbytes.de"><span class="email">julian.reschke@greenbytes.de</span></a></span><span class="vcardline">URI: <a href="http://greenbytes.de/tech/webdav/" class="url">http://greenbytes.de/tech/webdav/</a></span></address>
     1144      </div>
     1145      <h1 id="rfc.section.A" class="np"><a href="#rfc.section.A">A.</a>&nbsp;<a id="compatibility" href="#compatibility">Compatibility with Previous Versions</a></h1>
    11361146      <h2 id="rfc.section.A.1"><a href="#rfc.section.A.1">A.1</a>&nbsp;<a id="changes.from.rfc.2616" href="#changes.from.rfc.2616">Changes from RFC 2616</a></h2>
    11371147      <p id="rfc.section.A.1.p.1">Allow weak entity tags in all requests except range requests (Sections <a href="#weak.and.strong.validators" title="Weak and Strong Validators">5</a> and <a href="#header.if-none-match" id="rfc.xref.header.if-none-match.4" title="If-None-Match">7.4</a>).
     
    11891199         <li>Rewrite ABNFs to spell out whitespace rules, factor out header value format definitions.</li>
    11901200      </ul>
     1201      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
     1202      <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>
     1203      </p>
     1204      <div class="print2col">
     1205         <ul class="ind">
     1206            <li><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul>
     1207                  <li>304 Not Modified (status code)&nbsp;&nbsp;<a href="#rfc.iref.3"><b>4.1</b></a></li>
     1208               </ul>
     1209            </li>
     1210            <li><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul>
     1211                  <li>412 Precondition Failed (status code)&nbsp;&nbsp;<a href="#rfc.iref.4"><b>4.2</b></a></li>
     1212               </ul>
     1213            </li>
     1214            <li><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul>
     1215                  <li>ETag header&nbsp;&nbsp;<a href="#rfc.xref.header.etag.1">3</a>, <a href="#rfc.iref.e.1"><b>7.1</b></a>, <a href="#rfc.xref.header.etag.2">8.1</a></li>
     1216               </ul>
     1217            </li>
     1218            <li><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul>
     1219                  <li><tt>Grammar</tt>&nbsp;&nbsp;
     1220                     <ul>
     1221                        <li><tt>entity-tag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.1"><b>3</b></a></li>
     1222                        <li><tt>ETag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>7.1</b></a></li>
     1223                        <li><tt>ETag-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.5"><b>7.1</b></a></li>
     1224                        <li><tt>If-Match</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>7.2</b></a></li>
     1225                        <li><tt>If-Match-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>7.2</b></a></li>
     1226                        <li><tt>If-Modified-Since</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>7.3</b></a></li>
     1227                        <li><tt>If-Modified-Since-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>7.3</b></a></li>
     1228                        <li><tt>If-None-Match</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>7.4</b></a></li>
     1229                        <li><tt>If-None-Match-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>7.4</b></a></li>
     1230                        <li><tt>If-Unmodified-Since</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>7.5</b></a></li>
     1231                        <li><tt>If-Unmodified-Since-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>7.5</b></a></li>
     1232                        <li><tt>Last-Modified</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>7.6</b></a></li>
     1233                        <li><tt>Last-Modified-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>7.6</b></a></li>
     1234                        <li><tt>opaque-tag</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>3</b></a></li>
     1235                        <li><tt>weak</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>3</b></a></li>
     1236                     </ul>
     1237                  </li>
     1238               </ul>
     1239            </li>
     1240            <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul>
     1241                  <li>Headers&nbsp;&nbsp;
     1242                     <ul>
     1243                        <li>ETag&nbsp;&nbsp;<a href="#rfc.xref.header.etag.1">3</a>, <a href="#rfc.iref.h.1"><b>7.1</b></a>, <a href="#rfc.xref.header.etag.2">8.1</a></li>
     1244                        <li>If-Match&nbsp;&nbsp;<a href="#rfc.xref.header.if-match.1">3</a>, <a href="#rfc.xref.header.if-match.2">7.1</a>, <a href="#rfc.iref.h.2"><b>7.2</b></a>, <a href="#rfc.xref.header.if-match.3">8.1</a></li>
     1245                        <li>If-Modified-Since&nbsp;&nbsp;<a href="#rfc.iref.h.3"><b>7.3</b></a>, <a href="#rfc.xref.header.if-modified-since.1">8.1</a></li>
     1246                        <li>If-None-Match&nbsp;&nbsp;<a href="#rfc.xref.header.if-none-match.1">3</a>, <a href="#rfc.xref.header.if-none-match.2">7.1</a>, <a href="#rfc.iref.h.4"><b>7.4</b></a>, <a href="#rfc.xref.header.if-none-match.3">8.1</a>, <a href="#rfc.xref.header.if-none-match.4">A.1</a></li>
     1247                        <li>If-Unmodified-Since&nbsp;&nbsp;<a href="#rfc.iref.h.5"><b>7.5</b></a>, <a href="#rfc.xref.header.if-unmodified-since.1">8.1</a></li>
     1248                        <li>Last-Modified&nbsp;&nbsp;<a href="#rfc.iref.h.6"><b>7.6</b></a>, <a href="#rfc.xref.header.last-modified.1">8.1</a></li>
     1249                     </ul>
     1250                  </li>
     1251               </ul>
     1252            </li>
     1253            <li><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul>
     1254                  <li>If-Match header&nbsp;&nbsp;<a href="#rfc.xref.header.if-match.1">3</a>, <a href="#rfc.xref.header.if-match.2">7.1</a>, <a href="#rfc.iref.i.1"><b>7.2</b></a>, <a href="#rfc.xref.header.if-match.3">8.1</a></li>
     1255                  <li>If-Modified-Since header&nbsp;&nbsp;<a href="#rfc.iref.i.2"><b>7.3</b></a>, <a href="#rfc.xref.header.if-modified-since.1">8.1</a></li>
     1256                  <li>If-None-Match header&nbsp;&nbsp;<a href="#rfc.xref.header.if-none-match.1">3</a>, <a href="#rfc.xref.header.if-none-match.2">7.1</a>, <a href="#rfc.iref.i.3"><b>7.4</b></a>, <a href="#rfc.xref.header.if-none-match.3">8.1</a>, <a href="#rfc.xref.header.if-none-match.4">A.1</a></li>
     1257                  <li>If-Unmodified-Since header&nbsp;&nbsp;<a href="#rfc.iref.i.4"><b>7.5</b></a>, <a href="#rfc.xref.header.if-unmodified-since.1">8.1</a></li>
     1258               </ul>
     1259            </li>
     1260            <li><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul>
     1261                  <li>Last-Modified header&nbsp;&nbsp;<a href="#rfc.iref.l.1"><b>7.6</b></a>, <a href="#rfc.xref.header.last-modified.1">8.1</a></li>
     1262               </ul>
     1263            </li>
     1264            <li><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul>
     1265                  <li><em>Part1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">2</a>, <a href="#rfc.xref.Part1.2">2</a>, <a href="#rfc.xref.Part1.3">2</a>, <a href="#rfc.xref.Part1.4">2</a>, <a href="#rfc.xref.Part1.5">2</a>, <a href="#rfc.xref.Part1.6">4.1</a>, <a href="#rfc.xref.Part1.7">4.1</a>, <a href="#rfc.xref.Part1.8">9</a>, <a href="#Part1"><b>11.1</b></a><ul>
     1266                        <li><em>Section 2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.1">2</a></li>
     1267                        <li><em>Section 2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.2">2</a>, <a href="#rfc.xref.Part1.3">2</a>, <a href="#rfc.xref.Part1.4">2</a></li>
     1268                        <li><em>Section 3.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.5">2</a></li>
     1269                        <li><em>Section 8.3.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.6">4.1</a></li>
     1270                        <li><em>Section 8.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part1.7">4.1</a></li>
     1271                     </ul>
     1272                  </li>
     1273                  <li><em>Part5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">3</a>, <a href="#rfc.xref.Part5.2">5</a>, <a href="#rfc.xref.Part5.3">5</a>, <a href="#rfc.xref.Part5.4">7.1</a>, <a href="#rfc.xref.Part5.5">7.3</a>, <a href="#Part5"><b>11.1</b></a><ul>
     1274                        <li><em>Section 6.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.1">3</a>, <a href="#rfc.xref.Part5.4">7.1</a></li>
     1275                        <li><em>Section 6.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part5.5">7.3</a></li>
     1276                     </ul>
     1277                  </li>
     1278                  <li><em>Part6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.1">1</a>, <a href="#rfc.xref.Part6.2">7.2</a>, <a href="#rfc.xref.Part6.3">7.4</a>, <a href="#Part6"><b>11.1</b></a><ul>
     1279                        <li><em>Section 16.5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part6.2">7.2</a>, <a href="#rfc.xref.Part6.3">7.4</a></li>
     1280                     </ul>
     1281                  </li>
     1282               </ul>
     1283            </li>
     1284            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
     1285                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>11.1</b></a></li>
     1286                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#RFC2616"><b>11.2</b></a>, <a href="#rfc.xref.RFC2616.2">B.1</a></li>
     1287                  <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">8.1</a>, <a href="#RFC3864"><b>11.2</b></a></li>
     1288               </ul>
     1289            </li>
     1290            <li><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul>
     1291                  <li>Status Codes&nbsp;&nbsp;
     1292                     <ul>
     1293                        <li>304 Not Modified&nbsp;&nbsp;<a href="#rfc.iref.s.1"><b>4.1</b></a></li>
     1294                        <li>412 Precondition Failed&nbsp;&nbsp;<a href="#rfc.iref.s.2"><b>4.2</b></a></li>
     1295                     </ul>
     1296                  </li>
     1297               </ul>
     1298            </li>
     1299         </ul>
     1300      </div>
    11911301      <h1><a id="rfc.copyright" href="#rfc.copyright">Full Copyright Statement</a></h1>
     1302      <p>Copyright © The IETF Trust (2008).</p>
    11921303      <p>This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the
    11931304         authors retain all their rights.
     
    12071318      <p>Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result
    12081319         of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users
    1209          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;.
     1320         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>.
    12101321      </p>
    12111322      <p>The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary
     
    12131324         at <a href="mailto:ietf-ipr@ietf.org">ietf-ipr@ietf.org</a>.
    12141325      </p>
    1215       <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    1216       <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>
    1217       </p>
    1218       <div class="print2col">
    1219          <ul class="ind">
    1220             <li class="indline0"><a id="rfc.index.3" href="#rfc.index.3"><b>3</b></a><ul class="ind">
    1221                   <li class="indline1">304 Not Modified (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.iref.3"><b>4.1</b></a></li>
    1222                </ul>
    1223             </li>
    1224             <li class="indline0"><a id="rfc.index.4" href="#rfc.index.4"><b>4</b></a><ul class="ind">
    1225                   <li class="indline1">412 Precondition Failed (status code)&nbsp;&nbsp;<a class="iref" href="#rfc.iref.4"><b>4.2</b></a></li>
    1226                </ul>
    1227             </li>
    1228             <li class="indline0"><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul class="ind">
    1229                   <li class="indline1">ETag header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.etag.1">3</a>, <a class="iref" href="#rfc.iref.e.1"><b>7.1</b></a>, <a class="iref" href="#rfc.xref.header.etag.2">8.1</a></li>
    1230                </ul>
    1231             </li>
    1232             <li class="indline0"><a id="rfc.index.G" href="#rfc.index.G"><b>G</b></a><ul class="ind">
    1233                   <li class="indline1"><tt>Grammar</tt>&nbsp;&nbsp;
    1234                      <ul class="ind">
    1235                         <li class="indline1"><tt>entity-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.1"><b>3</b></a></li>
    1236                         <li class="indline1"><tt>ETag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>7.1</b></a></li>
    1237                         <li class="indline1"><tt>ETag-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>7.1</b></a></li>
    1238                         <li class="indline1"><tt>If-Match</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>7.2</b></a></li>
    1239                         <li class="indline1"><tt>If-Match-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>7.2</b></a></li>
    1240                         <li class="indline1"><tt>If-Modified-Since</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>7.3</b></a></li>
    1241                         <li class="indline1"><tt>If-Modified-Since-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>7.3</b></a></li>
    1242                         <li class="indline1"><tt>If-None-Match</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.10"><b>7.4</b></a></li>
    1243                         <li class="indline1"><tt>If-None-Match-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.11"><b>7.4</b></a></li>
    1244                         <li class="indline1"><tt>If-Unmodified-Since</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.12"><b>7.5</b></a></li>
    1245                         <li class="indline1"><tt>If-Unmodified-Since-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.13"><b>7.5</b></a></li>
    1246                         <li class="indline1"><tt>Last-Modified</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.14"><b>7.6</b></a></li>
    1247                         <li class="indline1"><tt>Last-Modified-v</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.15"><b>7.6</b></a></li>
    1248                         <li class="indline1"><tt>opaque-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3"><b>3</b></a></li>
    1249                         <li class="indline1"><tt>weak</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>3</b></a></li>
    1250                      </ul>
    1251                   </li>
    1252                </ul>
    1253             </li>
    1254             <li class="indline0"><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul class="ind">
    1255                   <li class="indline1">Headers&nbsp;&nbsp;
    1256                      <ul class="ind">
    1257                         <li class="indline1">ETag&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.etag.1">3</a>, <a class="iref" href="#rfc.iref.h.1"><b>7.1</b></a>, <a class="iref" href="#rfc.xref.header.etag.2">8.1</a></li>
    1258                         <li class="indline1">If-Match&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-match.1">3</a>, <a class="iref" href="#rfc.xref.header.if-match.2">7.1</a>, <a class="iref" href="#rfc.iref.h.2"><b>7.2</b></a>, <a class="iref" href="#rfc.xref.header.if-match.3">8.1</a></li>
    1259                         <li class="indline1">If-Modified-Since&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.3"><b>7.3</b></a>, <a class="iref" href="#rfc.xref.header.if-modified-since.1">8.1</a></li>
    1260                         <li class="indline1">If-None-Match&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-none-match.1">3</a>, <a class="iref" href="#rfc.xref.header.if-none-match.2">7.1</a>, <a class="iref" href="#rfc.iref.h.4"><b>7.4</b></a>, <a class="iref" href="#rfc.xref.header.if-none-match.3">8.1</a>, <a class="iref" href="#rfc.xref.header.if-none-match.4">A.1</a></li>
    1261                         <li class="indline1">If-Unmodified-Since&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.5"><b>7.5</b></a>, <a class="iref" href="#rfc.xref.header.if-unmodified-since.1">8.1</a></li>
    1262                         <li class="indline1">Last-Modified&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.6"><b>7.6</b></a>, <a class="iref" href="#rfc.xref.header.last-modified.1">8.1</a></li>
    1263                      </ul>
    1264                   </li>
    1265                </ul>
    1266             </li>
    1267             <li class="indline0"><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul class="ind">
    1268                   <li class="indline1">If-Match header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-match.1">3</a>, <a class="iref" href="#rfc.xref.header.if-match.2">7.1</a>, <a class="iref" href="#rfc.iref.i.1"><b>7.2</b></a>, <a class="iref" href="#rfc.xref.header.if-match.3">8.1</a></li>
    1269                   <li class="indline1">If-Modified-Since header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.2"><b>7.3</b></a>, <a class="iref" href="#rfc.xref.header.if-modified-since.1">8.1</a></li>
    1270                   <li class="indline1">If-None-Match header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.if-none-match.1">3</a>, <a class="iref" href="#rfc.xref.header.if-none-match.2">7.1</a>, <a class="iref" href="#rfc.iref.i.3"><b>7.4</b></a>, <a class="iref" href="#rfc.xref.header.if-none-match.3">8.1</a>, <a class="iref" href="#rfc.xref.header.if-none-match.4">A.1</a></li>
    1271                   <li class="indline1">If-Unmodified-Since header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.4"><b>7.5</b></a>, <a class="iref" href="#rfc.xref.header.if-unmodified-since.1">8.1</a></li>
    1272                </ul>
    1273             </li>
    1274             <li class="indline0"><a id="rfc.index.L" href="#rfc.index.L"><b>L</b></a><ul class="ind">
    1275                   <li class="indline1">Last-Modified header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.l.1"><b>7.6</b></a>, <a class="iref" href="#rfc.xref.header.last-modified.1">8.1</a></li>
    1276                </ul>
    1277             </li>
    1278             <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind">
    1279                   <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<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">4.1</a>, <a class="iref" href="#rfc.xref.Part1.7">4.1</a>, <a class="iref" href="#rfc.xref.Part1.8">9</a>, <a class="iref" href="#Part1"><b>11.1</b></a><ul class="ind">
    1280                         <li class="indline1"><em>Section 2.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">2</a></li>
    1281                         <li class="indline1"><em>Section 2.2</em>&nbsp;&nbsp;<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></li>
    1282                         <li class="indline1"><em>Section 3.3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.5">2</a></li>
    1283                         <li class="indline1"><em>Section 8.3.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.6">4.1</a></li>
    1284                         <li class="indline1"><em>Section 8.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.7">4.1</a></li>
    1285                      </ul>
    1286                   </li>
    1287                   <li class="indline1"><em>Part5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">3</a>, <a class="iref" href="#rfc.xref.Part5.2">5</a>, <a class="iref" href="#rfc.xref.Part5.3">5</a>, <a class="iref" href="#rfc.xref.Part5.4">7.1</a>, <a class="iref" href="#rfc.xref.Part5.5">7.3</a>, <a class="iref" href="#Part5"><b>11.1</b></a><ul class="ind">
    1288                         <li class="indline1"><em>Section 6.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">3</a>, <a class="iref" href="#rfc.xref.Part5.4">7.1</a></li>
    1289                         <li class="indline1"><em>Section 6.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.5">7.3</a></li>
    1290                      </ul>
    1291                   </li>
    1292                   <li class="indline1"><em>Part6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">1</a>, <a class="iref" href="#rfc.xref.Part6.2">7.2</a>, <a class="iref" href="#rfc.xref.Part6.3">7.4</a>, <a class="iref" href="#Part6"><b>11.1</b></a><ul class="ind">
    1293                         <li class="indline1"><em>Section 16.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.2">7.2</a>, <a class="iref" href="#rfc.xref.Part6.3">7.4</a></li>
    1294                      </ul>
    1295                   </li>
    1296                </ul>
    1297             </li>
    1298             <li class="indline0"><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul class="ind">
    1299                   <li class="indline1"><em>RFC2119</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2119.1">1.1</a>, <a class="iref" href="#RFC2119"><b>11.1</b></a></li>
    1300                   <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#RFC2616"><b>11.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.2">B.1</a></li>
    1301                   <li class="indline1"><em>RFC3864</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC3864.1">8.1</a>, <a class="iref" href="#RFC3864"><b>11.2</b></a></li>
    1302                </ul>
    1303             </li>
    1304             <li class="indline0"><a id="rfc.index.S" href="#rfc.index.S"><b>S</b></a><ul class="ind">
    1305                   <li class="indline1">Status Codes&nbsp;&nbsp;
    1306                      <ul class="ind">
    1307                         <li class="indline1">304 Not Modified&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.1"><b>4.1</b></a></li>
    1308                         <li class="indline1">412 Precondition Failed&nbsp;&nbsp;<a class="iref" href="#rfc.iref.s.2"><b>4.2</b></a></li>
    1309                      </ul>
    1310                   </li>
    1311                </ul>
    1312             </li>
    1313          </ul>
    1314       </div>
    13151326   </body>
    13161327</html>
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