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Changeset 1034 for draft-ietf-httpbis/latest/p2-semantics.html
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- 19/10/10 06:02:09 (12 years ago)
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draft-ietf-httpbis/latest/p2-semantics.html (modified) (23 diffs)
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draft-ietf-httpbis/latest/p2-semantics.html
r1033 r1034 542 542 </li> 543 543 <li class="tocline0">2. <a href="#method">Method</a><ul class="toc"> 544 <li class="tocline1">2.1 <a href="#method.registry">Method Registry</a></li> 544 <li class="tocline1">2.1 <a href="#method.registry">Method Registry</a><ul class="toc"> 545 <li class="tocline1">2.1.1 <a href="#rfc.section.2.1.1">Considerations for New Methods</a></li> 546 </ul> 547 </li> 545 548 </ul> 546 549 </li> … … 786 789 <p id="rfc.section.2.1.p.4">The registry itself is maintained at <<a href="http://www.iana.org/assignments/http-methods">http://www.iana.org/assignments/http-methods</a>>. 787 790 </p> 791 <h3 id="rfc.section.2.1.1"><a href="#rfc.section.2.1.1">2.1.1</a> Considerations for New Methods 792 </h3> 793 <p id="rfc.section.2.1.1.p.1">When it is necessary to express new semantics for a HTTP request that aren't specific to a single application or media type, 794 and currently defined methods are inadequate, it may be appropriate to register a new method. 795 </p> 796 <p id="rfc.section.2.1.1.p.2">New methods <em class="bcp14">SHOULD</em> be potentially applicable to any resource. I.e., they should not be specific to any particular media type, "type" of resource, 797 or application. 798 </p> 799 <p id="rfc.section.2.1.1.p.3">New methods <em class="bcp14">MUST NOT</em> prohibit a message-body on either the request or the response message; however they <em class="bcp14">MAY</em> specify that only a zero-length body is allowed. 800 </p> 801 <p id="rfc.section.2.1.1.p.4">New methods <em class="bcp14">MUST</em> define whether they are safe (<a href="#safe.methods" title="Safe Methods">Section 7.1.1</a>) and whether they are idempotent (<a href="#idempotent.methods" title="Idempotent Methods">Section 7.1.2</a>). They <em class="bcp14">MUST</em> also state whether they can be cached (<a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>); in particular what conditions a cache may store the response, and under what conditions such a stored response may be used 802 to satisfy a subsequent request. 803 </p> 804 <p id="rfc.section.2.1.1.p.5">New methods <em class="bcp14">SHOULD</em> explain how conditional request headers (<a href="#Part4" id="rfc.xref.Part4.6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>) affect the response (if there is any effect). 805 </p> 806 <p id="rfc.section.2.1.1.p.6">HTTP methods <em class="bcp14">SHOULD</em> be registered in a document that isn't specific to an application or other use of HTTP, so that it's clear that they are not 807 specific to that application or extension. 808 </p> 788 809 <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a> <a id="request.header.fields" href="#request.header.fields">Request Header Fields</a></h1> 789 810 <p id="rfc.section.3.p.1">The request-header fields allow the client to pass additional information about the request, and about the client itself, … … 799 820 / <a href="#header.from" class="smpl">From</a> ; <a href="#header.from" id="rfc.xref.header.from.1" title="From">Section 9.3</a> 800 821 / <a href="#abnf.dependencies" class="smpl">Host</a> ; <a href="#Part1" id="rfc.xref.Part1.18"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.host" title="Host">Section 9.4</a> 801 / <a href="#abnf.dependencies" class="smpl">If-Match</a> ; <a href="#Part4" id="rfc.xref.Part4. 6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 6.2</a>802 / <a href="#abnf.dependencies" class="smpl">If-Modified-Since</a> ; <a href="#Part4" id="rfc.xref.Part4. 7"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 6.3</a>803 / <a href="#abnf.dependencies" class="smpl">If-None-Match</a> ; <a href="#Part4" id="rfc.xref.Part4. 8"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 6.4</a>822 / <a href="#abnf.dependencies" class="smpl">If-Match</a> ; <a href="#Part4" id="rfc.xref.Part4.7"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-match" title="If-Match">Section 6.2</a> 823 / <a href="#abnf.dependencies" class="smpl">If-Modified-Since</a> ; <a href="#Part4" id="rfc.xref.Part4.8"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-modified-since" title="If-Modified-Since">Section 6.3</a> 824 / <a href="#abnf.dependencies" class="smpl">If-None-Match</a> ; <a href="#Part4" id="rfc.xref.Part4.9"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-none-match" title="If-None-Match">Section 6.4</a> 804 825 / <a href="#abnf.dependencies" class="smpl">If-Range</a> ; <a href="#Part5" id="rfc.xref.Part5.4"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.if-range" title="If-Range">Section 5.3</a> 805 / <a href="#abnf.dependencies" class="smpl">If-Unmodified-Since</a> ; <a href="#Part4" id="rfc.xref.Part4. 9"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 6.5</a>826 / <a href="#abnf.dependencies" class="smpl">If-Unmodified-Since</a> ; <a href="#Part4" id="rfc.xref.Part4.10"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.if-unmodified-since" title="If-Unmodified-Since">Section 6.5</a> 806 827 / <a href="#header.max-forwards" class="smpl">Max-Forwards</a> ; <a href="#header.max-forwards" id="rfc.xref.header.max-forwards.1" title="Max-Forwards">Section 9.5</a> 807 828 / <a href="#abnf.dependencies" class="smpl">Proxy-Authorization</a> ; <a href="#Part7" id="rfc.xref.Part7.6"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authorization" title="Proxy-Authorization">Section 4.3</a> … … 815 836 <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a> <a id="status.code.and.reason.phrase" href="#status.code.and.reason.phrase">Status Code and Reason Phrase</a></h1> 816 837 <p id="rfc.section.4.p.1">The Status-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. The status 817 codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section 8</a>, <a href="p4-conditional.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part4" id="rfc.xref.Part4.1 0"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p5-range.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part5" id="rfc.xref.Part5.6"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, and <a href="p7-auth.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part7" id="rfc.xref.Part7.7"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>.838 codes listed below are defined in <a href="#status.codes" title="Status Code Definitions">Section 8</a>, <a href="p4-conditional.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part4" id="rfc.xref.Part4.11"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p5-range.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part5" id="rfc.xref.Part5.6"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, and <a href="p7-auth.html#status.code.definitions" title="Status Code Definitions">Section 3</a> of <a href="#Part7" id="rfc.xref.Part7.7"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>. 818 839 </p> 819 840 <p id="rfc.section.4.p.2">The Reason-Phrase is intended to give a short textual description of the Status-Code. The Status-Code is intended for use … … 837 858 / "302" ; <a href="#status.302" id="rfc.xref.status.302.1" title="302 Found">Section 8.3.3</a>: Found 838 859 / "303" ; <a href="#status.303" id="rfc.xref.status.303.1" title="303 See Other">Section 8.3.4</a>: See Other 839 / "304" ; <a href="#Part4" id="rfc.xref.Part4.1 1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#status.304" title="304 Not Modified">Section 3.1</a>: Not Modified860 / "304" ; <a href="#Part4" id="rfc.xref.Part4.12"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#status.304" title="304 Not Modified">Section 3.1</a>: Not Modified 840 861 / "305" ; <a href="#status.305" id="rfc.xref.status.305.1" title="305 Use Proxy">Section 8.3.6</a>: Use Proxy 841 862 / "307" ; <a href="#status.307" id="rfc.xref.status.307.1" title="307 Temporary Redirect">Section 8.3.8</a>: Temporary Redirect … … 852 873 / "410" ; <a href="#status.410" id="rfc.xref.status.410.1" title="410 Gone">Section 8.4.11</a>: Gone 853 874 / "411" ; <a href="#status.411" id="rfc.xref.status.411.1" title="411 Length Required">Section 8.4.12</a>: Length Required 854 / "412" ; <a href="#Part4" id="rfc.xref.Part4.1 2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#status.412" title="412 Precondition Failed">Section 3.2</a>: Precondition Failed875 / "412" ; <a href="#Part4" id="rfc.xref.Part4.13"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#status.412" title="412 Precondition Failed">Section 3.2</a>: Precondition Failed 855 876 / "413" ; <a href="#status.413" id="rfc.xref.status.413.1" title="413 Request Entity Too Large">Section 8.4.14</a>: Request Entity Too Large 856 877 / "414" ; <a href="#status.414" id="rfc.xref.status.414.1" title="414 URI Too Long">Section 8.4.15</a>: URI Too Long … … 885 906 </p> 886 907 <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.7"></span> <a href="#response.header.fields" class="smpl">response-header</a> = <a href="#abnf.dependencies" class="smpl">Accept-Ranges</a> ; <a href="#Part5" id="rfc.xref.Part5.9"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.accept-ranges" title="Accept-Ranges">Section 5.1</a> 887 / <a href="#abnf.dependencies" class="smpl">Age</a> ; <a href="#Part6" id="rfc.xref.Part6. 3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 3.1</a>908 / <a href="#abnf.dependencies" class="smpl">Age</a> ; <a href="#Part6" id="rfc.xref.Part6.4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.age" title="Age">Section 3.1</a> 888 909 / <a href="#header.allow" class="smpl">Allow</a> ; <a href="#header.allow" id="rfc.xref.header.allow.2" title="Allow">Section 9.1</a> 889 / <a href="#abnf.dependencies" class="smpl">ETag</a> ; <a href="#Part4" id="rfc.xref.Part4.1 3"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a>910 / <a href="#abnf.dependencies" class="smpl">ETag</a> ; <a href="#Part4" id="rfc.xref.Part4.14"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a> 890 911 / <a href="#header.location" class="smpl">Location</a> ; <a href="#header.location" id="rfc.xref.header.location.1" title="Location">Section 9.4</a> 891 912 / <a href="#abnf.dependencies" class="smpl">Proxy-Authenticate</a> ; <a href="#Part7" id="rfc.xref.Part7.10"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.proxy-authenticate" title="Proxy-Authenticate">Section 4.2</a> 892 913 / <a href="#header.retry-after" class="smpl">Retry-After</a> ; <a href="#header.retry-after" id="rfc.xref.header.retry-after.1" title="Retry-After">Section 9.7</a> 893 914 / <a href="#header.server" class="smpl">Server</a> ; <a href="#header.server" id="rfc.xref.header.server.1" title="Server">Section 9.8</a> 894 / <a href="#abnf.dependencies" class="smpl">Vary</a> ; <a href="#Part6" id="rfc.xref.Part6. 4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 3.5</a>915 / <a href="#abnf.dependencies" class="smpl">Vary</a> ; <a href="#Part6" id="rfc.xref.Part6.5"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.vary" title="Vary">Section 3.5</a> 895 916 / <a href="#abnf.dependencies" class="smpl">WWW-Authenticate</a> ; <a href="#Part7" id="rfc.xref.Part7.11"><cite title="HTTP/1.1, part 7: Authentication">[Part7]</cite></a>, <a href="p7-auth.html#header.www-authenticate" title="WWW-Authenticate">Section 4.4</a> 896 917 </pre><p id="rfc.section.5.p.3">Response-header field names can be extended reliably only in combination with a change in the protocol version. However, new … … 917 938 </li> 918 939 <li>If the response status code is 204, 206, or 304 and the request method was GET or HEAD, the response payload is a partial 919 representation of the target (see <a href="p6-cache.html#combining.responses" title="Combining Responses">Section 2.8</a> of <a href="#Part6" id="rfc.xref.Part6. 5"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).940 representation of the target (see <a href="p6-cache.html#combining.responses" title="Combining Responses">Section 2.8</a> of <a href="#Part6" id="rfc.xref.Part6.6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). 920 941 </li> 921 942 <li>If the response has a Content-Location header field, and that URI is the same as the effective request URI, the response payload … … 998 1019 be completed without transferring data already held by the client. 999 1020 </p> 1000 <p id="rfc.section.7.3.p.5">The response to a GET request is cacheable and <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests (see <a href="#Part6" id="rfc.xref.Part6. 6"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).1021 <p id="rfc.section.7.3.p.5">The response to a GET request is cacheable and <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests (see <a href="#Part6" id="rfc.xref.Part6.7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). 1001 1022 </p> 1002 1023 <p id="rfc.section.7.3.p.6">See <a href="#encoding.sensitive.information.in.uris" title="Encoding Sensitive Information in URIs">Section 11.2</a> for security considerations when used for forms. … … 1009 1030 hypertext links for validity, accessibility, and recent modification. 1010 1031 </p> 1011 <p id="rfc.section.7.4.p.2">The response to a HEAD request is cacheable and <em class="bcp14">MAY</em> be used to satisfy a subsequent HEAD request; see <a href="#Part6" id="rfc.xref.Part6. 7"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>. It also <em class="bcp14">MAY</em> be used to update a previously cached representation from that resource; if the new field values indicate that the cached1032 <p id="rfc.section.7.4.p.2">The response to a HEAD request is cacheable and <em class="bcp14">MAY</em> be used to satisfy a subsequent HEAD request; see <a href="#Part6" id="rfc.xref.Part6.8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>. It also <em class="bcp14">MAY</em> be used to update a previously cached representation from that resource; if the new field values indicate that the cached 1012 1033 representation differs from the current representation (as would be indicated by a change in Content-Length, Content-MD5, 1013 1034 ETag or Last-Modified), then the cache <em class="bcp14">MUST</em> treat the cache entry as stale. … … 1035 1056 a Location header field (see <a href="#header.location" id="rfc.xref.header.location.2" title="Location">Section 9.4</a>). 1036 1057 </p> 1037 <p id="rfc.section.7.5.p.5">Responses to POST requests are only cacheable when they include explicit freshness information (see <a href="p6-cache.html#calculating.freshness.lifetime" title="Calculating Freshness Lifetime">Section 2.3.1</a> of <a href="#Part6" id="rfc.xref.Part6. 8"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). A cached POST response with a Content-Location header field (see <a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) whose value is the effective Request URI <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests.1058 <p id="rfc.section.7.5.p.5">Responses to POST requests are only cacheable when they include explicit freshness information (see <a href="p6-cache.html#calculating.freshness.lifetime" title="Calculating Freshness Lifetime">Section 2.3.1</a> of <a href="#Part6" id="rfc.xref.Part6.9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>). A cached POST response with a Content-Location header field (see <a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) whose value is the effective Request URI <em class="bcp14">MAY</em> be used to satisfy subsequent GET and HEAD requests. 1038 1059 </p> 1039 1060 <p id="rfc.section.7.5.p.6">Note that POST caching is not widely implemented. However, the 303 (See Other) response can be used to direct the user agent … … 1151 1172 <dd>a representation containing the request message as received by the end server.</dd> 1152 1173 </dl> 1153 <p id="rfc.section.8.2.1.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6. 9"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 200 responses.1174 <p id="rfc.section.8.2.1.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.10"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 200 responses. 1154 1175 </p> 1155 1176 <div id="rfc.iref.28"></div> … … 1163 1184 </p> 1164 1185 <p id="rfc.section.8.2.2.p.2">A 201 response <em class="bcp14">MAY</em> contain an ETag response header field indicating the current value of the entity-tag for the representation of the resource 1165 just created (see <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a> of <a href="#Part4" id="rfc.xref.Part4.1 4"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>).1186 just created (see <a href="p4-conditional.html#header.etag" title="ETag">Section 6.1</a> of <a href="#Part4" id="rfc.xref.Part4.15"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>). 1166 1187 </p> 1167 1188 <div id="rfc.iref.29"></div> … … 1185 1206 when the response would otherwise be 200 (OK). 1186 1207 </p> 1187 <p id="rfc.section.8.2.4.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.1 0"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 203 responses.1208 <p id="rfc.section.8.2.4.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.11"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 203 responses. 1188 1209 </p> 1189 1210 <div id="rfc.iref.31"></div> … … 1214 1235 defined in <a href="p5-range.html#status.206" title="206 Partial Content">Section 3.1</a> of <a href="#Part5" id="rfc.xref.Part5.11"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>. 1215 1236 </p> 1216 <p id="rfc.section.8.2.7.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.1 1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 206 responses.1237 <p id="rfc.section.8.2.7.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.12"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 206 responses. 1217 1238 </p> 1218 1239 <h2 id="rfc.section.8.3"><a href="#rfc.section.8.3">8.3</a> <a id="status.3xx" href="#status.3xx">Redirection 3xx</a></h2> … … 1238 1259 <p id="rfc.section.8.3.1.p.3">If the server has a preferred choice of representation, it <em class="bcp14">SHOULD</em> include the specific URI for that representation in the Location field; user agents <em class="bcp14">MAY</em> use the Location field value for automatic redirection. 1239 1260 </p> 1240 <p id="rfc.section.8.3.1.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.1 2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 300 responses.1261 <p id="rfc.section.8.3.1.p.4">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.13"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 300 responses. 1241 1262 </p> 1242 1263 <div id="rfc.iref.35"></div> … … 1246 1267 request URI to one or more of the new references returned by the server, where possible. 1247 1268 </p> 1248 <p id="rfc.section.8.3.2.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.1 3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 301 responses.1269 <p id="rfc.section.8.3.2.p.2">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.14"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 301 responses. 1249 1270 </p> 1250 1271 <p id="rfc.section.8.3.2.p.3">The new permanent URI <em class="bcp14">SHOULD</em> be given by the Location field in the response. Unless the request method was HEAD, the representation of the response <em class="bcp14">SHOULD</em> contain a short hypertext note with a hyperlink to the new URI(s). … … 1298 1319 <h3 id="rfc.section.8.3.5"><a href="#rfc.section.8.3.5">8.3.5</a> <a id="status.304" href="#status.304">304 Not Modified</a></h3> 1299 1320 <p id="rfc.section.8.3.5.p.1">The response to the request has not been modified since the conditions indicated by the client's conditional GET request, 1300 as defined in <a href="p4-conditional.html#status.304" title="304 Not Modified">Section 3.1</a> of <a href="#Part4" id="rfc.xref.Part4.1 5"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.1321 as defined in <a href="p4-conditional.html#status.304" title="304 Not Modified">Section 3.1</a> of <a href="#Part4" id="rfc.xref.Part4.16"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>. 1301 1322 </p> 1302 1323 <div id="rfc.iref.39"></div> … … 1418 1439 -- that is left to the discretion of the server owner. 1419 1440 </p> 1420 <p id="rfc.section.8.4.11.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.1 4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 410 responses.1441 <p id="rfc.section.8.4.11.p.3">Caches <em class="bcp14">MAY</em> use a heuristic (see <a href="p6-cache.html#heuristic.freshness" title="Calculating Heuristic Freshness">Section 2.3.1.1</a> of <a href="#Part6" id="rfc.xref.Part6.15"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) to determine freshness for 410 responses. 1421 1442 </p> 1422 1443 <div id="rfc.iref.53"></div> … … 1430 1451 <h3 id="rfc.section.8.4.13"><a href="#rfc.section.8.4.13">8.4.13</a> <a id="status.412" href="#status.412">412 Precondition Failed</a></h3> 1431 1452 <p id="rfc.section.8.4.13.p.1">The precondition given in one or more of the request-header fields evaluated to false when it was tested on the server, as 1432 defined in <a href="p4-conditional.html#status.412" title="412 Precondition Failed">Section 3.2</a> of <a href="#Part4" id="rfc.xref.Part4.1 6"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.1453 defined in <a href="p4-conditional.html#status.412" title="412 Precondition Failed">Section 3.2</a> of <a href="#Part4" id="rfc.xref.Part4.17"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>. 1433 1454 </p> 1434 1455 <div id="rfc.iref.55"></div> … … 2421 2442 <p id="rfc.section.C.2.p.2">Other changes: </p> 2422 2443 <ul> 2423 <li>Move definitions of 304 and 412 condition codes to <a href="#Part4" id="rfc.xref.Part4.1 7"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>2444 <li>Move definitions of 304 and 412 condition codes to <a href="#Part4" id="rfc.xref.Part4.18"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a> 2424 2445 </li> 2425 2446 </ul> … … 2772 2793 </ul> 2773 2794 </li> 2774 <li class="indline1"><em>Part4</em> <a class="iref" href="#rfc.xref.Part4.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.3">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.4">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.5">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.6"> 3</a>, <a class="iref" href="#rfc.xref.Part4.7">3</a>, <a class="iref" href="#rfc.xref.Part4.8">3</a>, <a class="iref" href="#rfc.xref.Part4.9">3</a>, <a class="iref" href="#rfc.xref.Part4.10">4</a>, <a class="iref" href="#rfc.xref.Part4.11">4</a>, <a class="iref" href="#rfc.xref.Part4.12">4</a>, <a class="iref" href="#rfc.xref.Part4.13">5</a>, <a class="iref" href="#rfc.xref.Part4.14">8.2.2</a>, <a class="iref" href="#rfc.xref.Part4.15">8.3.5</a>, <a class="iref" href="#rfc.xref.Part4.16">8.4.13</a>, <a class="iref" href="#Part4"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part4.17">C.2</a><ul class="ind">2775 <li class="indline1"><em>Section 3</em> <a class="iref" href="#rfc.xref.Part4.1 0">4</a></li>2776 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part4.1 1">4</a>, <a class="iref" href="#rfc.xref.Part4.15">8.3.5</a></li>2777 <li class="indline1"><em>Section 3.2</em> <a class="iref" href="#rfc.xref.Part4.1 2">4</a>, <a class="iref" href="#rfc.xref.Part4.16">8.4.13</a></li>2778 <li class="indline1"><em>Section 6.1</em> <a class="iref" href="#rfc.xref.Part4.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.1 3">5</a>, <a class="iref" href="#rfc.xref.Part4.14">8.2.2</a></li>2779 <li class="indline1"><em>Section 6.2</em> <a class="iref" href="#rfc.xref.Part4.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4. 6">3</a></li>2780 <li class="indline1"><em>Section 6.3</em> <a class="iref" href="#rfc.xref.Part4.3">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4. 7">3</a></li>2781 <li class="indline1"><em>Section 6.4</em> <a class="iref" href="#rfc.xref.Part4.4">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4. 8">3</a></li>2782 <li class="indline1"><em>Section 6.5</em> <a class="iref" href="#rfc.xref.Part4.5">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4. 9">3</a></li>2795 <li class="indline1"><em>Part4</em> <a class="iref" href="#rfc.xref.Part4.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.3">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.4">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.5">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.6">2.1.1</a>, <a class="iref" href="#rfc.xref.Part4.7">3</a>, <a class="iref" href="#rfc.xref.Part4.8">3</a>, <a class="iref" href="#rfc.xref.Part4.9">3</a>, <a class="iref" href="#rfc.xref.Part4.10">3</a>, <a class="iref" href="#rfc.xref.Part4.11">4</a>, <a class="iref" href="#rfc.xref.Part4.12">4</a>, <a class="iref" href="#rfc.xref.Part4.13">4</a>, <a class="iref" href="#rfc.xref.Part4.14">5</a>, <a class="iref" href="#rfc.xref.Part4.15">8.2.2</a>, <a class="iref" href="#rfc.xref.Part4.16">8.3.5</a>, <a class="iref" href="#rfc.xref.Part4.17">8.4.13</a>, <a class="iref" href="#Part4"><b>13.1</b></a>, <a class="iref" href="#rfc.xref.Part4.18">C.2</a><ul class="ind"> 2796 <li class="indline1"><em>Section 3</em> <a class="iref" href="#rfc.xref.Part4.11">4</a></li> 2797 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part4.12">4</a>, <a class="iref" href="#rfc.xref.Part4.16">8.3.5</a></li> 2798 <li class="indline1"><em>Section 3.2</em> <a class="iref" href="#rfc.xref.Part4.13">4</a>, <a class="iref" href="#rfc.xref.Part4.17">8.4.13</a></li> 2799 <li class="indline1"><em>Section 6.1</em> <a class="iref" href="#rfc.xref.Part4.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.14">5</a>, <a class="iref" href="#rfc.xref.Part4.15">8.2.2</a></li> 2800 <li class="indline1"><em>Section 6.2</em> <a class="iref" href="#rfc.xref.Part4.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.7">3</a></li> 2801 <li class="indline1"><em>Section 6.3</em> <a class="iref" href="#rfc.xref.Part4.3">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.8">3</a></li> 2802 <li class="indline1"><em>Section 6.4</em> <a class="iref" href="#rfc.xref.Part4.4">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.9">3</a></li> 2803 <li class="indline1"><em>Section 6.5</em> <a class="iref" href="#rfc.xref.Part4.5">1.2.2</a>, <a class="iref" href="#rfc.xref.Part4.10">3</a></li> 2783 2804 </ul> 2784 2805 </li> … … 2792 2813 </ul> 2793 2814 </li> 2794 <li class="indline1"><em>Part6</em> <a class="iref" href="#rfc.xref.Part6.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.3"> 5</a>, <a class="iref" href="#rfc.xref.Part6.4">5</a>, <a class="iref" href="#rfc.xref.Part6.5">6.1</a>, <a class="iref" href="#rfc.xref.Part6.6">7.3</a>, <a class="iref" href="#rfc.xref.Part6.7">7.4</a>, <a class="iref" href="#rfc.xref.Part6.8">7.5</a>, <a class="iref" href="#rfc.xref.Part6.9">8.2.1</a>, <a class="iref" href="#rfc.xref.Part6.10">8.2.4</a>, <a class="iref" href="#rfc.xref.Part6.11">8.2.7</a>, <a class="iref" href="#rfc.xref.Part6.12">8.3.1</a>, <a class="iref" href="#rfc.xref.Part6.13">8.3.2</a>, <a class="iref" href="#rfc.xref.Part6.14">8.4.11</a>, <a class="iref" href="#Part6"><b>13.1</b></a><ul class="ind">2795 <li class="indline1"><em>Section 2.3.1</em> <a class="iref" href="#rfc.xref.Part6. 8">7.5</a></li>2796 <li class="indline1"><em>Section 2.3.1.1</em> <a class="iref" href="#rfc.xref.Part6. 9">8.2.1</a>, <a class="iref" href="#rfc.xref.Part6.10">8.2.4</a>, <a class="iref" href="#rfc.xref.Part6.11">8.2.7</a>, <a class="iref" href="#rfc.xref.Part6.12">8.3.1</a>, <a class="iref" href="#rfc.xref.Part6.13">8.3.2</a>, <a class="iref" href="#rfc.xref.Part6.14">8.4.11</a></li>2797 <li class="indline1"><em>Section 2.8</em> <a class="iref" href="#rfc.xref.Part6. 5">6.1</a></li>2798 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part6.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6. 3">5</a></li>2799 <li class="indline1"><em>Section 3.5</em> <a class="iref" href="#rfc.xref.Part6.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6. 4">5</a></li>2815 <li class="indline1"><em>Part6</em> <a class="iref" href="#rfc.xref.Part6.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.3">2.1.1</a>, <a class="iref" href="#rfc.xref.Part6.4">5</a>, <a class="iref" href="#rfc.xref.Part6.5">5</a>, <a class="iref" href="#rfc.xref.Part6.6">6.1</a>, <a class="iref" href="#rfc.xref.Part6.7">7.3</a>, <a class="iref" href="#rfc.xref.Part6.8">7.4</a>, <a class="iref" href="#rfc.xref.Part6.9">7.5</a>, <a class="iref" href="#rfc.xref.Part6.10">8.2.1</a>, <a class="iref" href="#rfc.xref.Part6.11">8.2.4</a>, <a class="iref" href="#rfc.xref.Part6.12">8.2.7</a>, <a class="iref" href="#rfc.xref.Part6.13">8.3.1</a>, <a class="iref" href="#rfc.xref.Part6.14">8.3.2</a>, <a class="iref" href="#rfc.xref.Part6.15">8.4.11</a>, <a class="iref" href="#Part6"><b>13.1</b></a><ul class="ind"> 2816 <li class="indline1"><em>Section 2.3.1</em> <a class="iref" href="#rfc.xref.Part6.9">7.5</a></li> 2817 <li class="indline1"><em>Section 2.3.1.1</em> <a class="iref" href="#rfc.xref.Part6.10">8.2.1</a>, <a class="iref" href="#rfc.xref.Part6.11">8.2.4</a>, <a class="iref" href="#rfc.xref.Part6.12">8.2.7</a>, <a class="iref" href="#rfc.xref.Part6.13">8.3.1</a>, <a class="iref" href="#rfc.xref.Part6.14">8.3.2</a>, <a class="iref" href="#rfc.xref.Part6.15">8.4.11</a></li> 2818 <li class="indline1"><em>Section 2.8</em> <a class="iref" href="#rfc.xref.Part6.6">6.1</a></li> 2819 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part6.1">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.4">5</a></li> 2820 <li class="indline1"><em>Section 3.5</em> <a class="iref" href="#rfc.xref.Part6.2">1.2.2</a>, <a class="iref" href="#rfc.xref.Part6.5">5</a></li> 2800 2821 </ul> 2801 2822 </li>
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