Ignore:
Timestamp:
30/11/12 04:06:54 (8 years ago)
Author:
mnot@…
Message:

Last few adjustments to Changes from RFC2616.

File:
1 edited

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Unmodified
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  • draft-ietf-httpbis/latest/p2-semantics.html

    r2024 r2025  
    40874087      </p>
    40884088      <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="changes.from.rfc.2616" href="#changes.from.rfc.2616">Changes from RFC 2616</a></h1>
    4089       <p id="rfc.section.C.p.1">The term "representation" is introduced, replacing both "entity" and "variant."</p>
    4090       <p id="rfc.section.C.p.2"> <a href="#header.content-location" class="smpl">Content-Location</a> no longer sets a base URI, due to poor implementation support (which was caused by too many broken servers emitting bogus
     4089      <p id="rfc.section.C.p.1">The term "representation" is introduced, replacing both "entity" and "variant." (<a href="#representation" title="Representation">Section&nbsp;3</a>)
     4090      </p>
     4091      <p id="rfc.section.C.p.2">"Server-Driven" and "agent-driven" content negotiation are now called proactive and reactive content negotiation (respectively).
     4092         (<a href="#content.negotiation" title="Content Negotiation">Section&nbsp;3.4</a>)
     4093      </p>
     4094      <p id="rfc.section.C.p.3"> <a href="#header.content-location" class="smpl">Content-Location</a> no longer sets a base URI, due to poor implementation support (which was caused by too many broken servers emitting bogus
    40914095         Content-Location header fields, and also the potentially undesirable effect of potentially breaking relative links in content-negotiated
    40924096         resources). (<a href="#header.content-location" id="rfc.xref.header.content-location.5" title="Content-Location">Section&nbsp;3.1.4.2</a>)
    40934097      </p>
    4094       <p id="rfc.section.C.p.3">Rules for identifying the payload of a message have been defined. (<a href="#identifying.payload" title="Identifying a Representation">Section&nbsp;3.1.4.1</a>)
    4095       </p>
    4096       <p id="rfc.section.C.p.4">GET requests can have a body; it just has no meaning. (<a href="#GET" id="rfc.xref.GET.4" title="GET">Section&nbsp;5.3.1</a>)
    4097       </p>
    4098       <p id="rfc.section.C.p.5">The definition of POST has been clarified. (<a href="#POST" id="rfc.xref.POST.4" title="POST">Section&nbsp;5.3.3</a>)
    4099       </p>
    4100       <p id="rfc.section.C.p.6">Servers are no longer required to handle all Content-* header fields in requests. (<a href="#PUT" id="rfc.xref.PUT.4" title="PUT">Section&nbsp;5.3.4</a>)
    4101       </p>
    4102       <p id="rfc.section.C.p.7">Use of <a href="p5-range.html#header.content-range" class="smpl">Content-Range</a> is explicitly banned on PUT requests. (<a href="#PUT" id="rfc.xref.PUT.5" title="PUT">Section&nbsp;5.3.4</a>)
    4103       </p>
    4104       <p id="rfc.section.C.p.8">The CONNECT method is now defined by this specification, taking over from <a href="#RFC2817" id="rfc.xref.RFC2817.2"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#CONNECT" id="rfc.xref.CONNECT.3" title="CONNECT">Section&nbsp;5.3.6</a>)
    4105       </p>
    4106       <p id="rfc.section.C.p.9">The requirements upon and semantics of CONNECT request and response bodies have been clarified. (<a href="#CONNECT" id="rfc.xref.CONNECT.4" title="CONNECT">Section&nbsp;5.3.6</a>)
    4107       </p>
    4108       <p id="rfc.section.C.p.10">The <a href="#OPTIONS" class="smpl">OPTIONS</a> and <a href="#TRACE" class="smpl">TRACE</a> request methods are now defined as being safe. (<a href="#OPTIONS" id="rfc.xref.OPTIONS.4" title="OPTIONS">Section&nbsp;5.3.7</a> and <a href="#TRACE" id="rfc.xref.TRACE.5" title="TRACE">Section&nbsp;5.3.8</a>)
    4109       </p>
    4110       <p id="rfc.section.C.p.11">The <a href="#header.max-forwards" class="smpl">Max-Forwards</a> header field is now restricted to the OPTIONS and TRACE methods (previously, extension methods could have used it as well).
     4098      <p id="rfc.section.C.p.4">Rules for identifying the payload of a message have been defined. (<a href="#identifying.payload" title="Identifying a Representation">Section&nbsp;3.1.4.1</a>)
     4099      </p>
     4100      <p id="rfc.section.C.p.5">GET requests can have a body; it just has no meaning. (<a href="#GET" id="rfc.xref.GET.4" title="GET">Section&nbsp;5.3.1</a>)
     4101      </p>
     4102      <p id="rfc.section.C.p.6">The definition of POST has been clarified. (<a href="#POST" id="rfc.xref.POST.4" title="POST">Section&nbsp;5.3.3</a>)
     4103      </p>
     4104      <p id="rfc.section.C.p.7">Servers are no longer required to handle all Content-* header fields in requests. (<a href="#PUT" id="rfc.xref.PUT.4" title="PUT">Section&nbsp;5.3.4</a>)
     4105      </p>
     4106      <p id="rfc.section.C.p.8">Use of <a href="p5-range.html#header.content-range" class="smpl">Content-Range</a> is explicitly banned on PUT requests. (<a href="#PUT" id="rfc.xref.PUT.5" title="PUT">Section&nbsp;5.3.4</a>)
     4107      </p>
     4108      <p id="rfc.section.C.p.9">The CONNECT method is now defined by this specification, taking over from <a href="#RFC2817" id="rfc.xref.RFC2817.2"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#CONNECT" id="rfc.xref.CONNECT.3" title="CONNECT">Section&nbsp;5.3.6</a>)
     4109      </p>
     4110      <p id="rfc.section.C.p.10">The requirements upon and semantics of CONNECT request and response bodies have been clarified. (<a href="#CONNECT" id="rfc.xref.CONNECT.4" title="CONNECT">Section&nbsp;5.3.6</a>)
     4111      </p>
     4112      <p id="rfc.section.C.p.11">The <a href="#OPTIONS" class="smpl">OPTIONS</a> and <a href="#TRACE" class="smpl">TRACE</a> request methods are now defined as being safe. (<a href="#OPTIONS" id="rfc.xref.OPTIONS.4" title="OPTIONS">Section&nbsp;5.3.7</a> and <a href="#TRACE" id="rfc.xref.TRACE.5" title="TRACE">Section&nbsp;5.3.8</a>)
     4113      </p>
     4114      <p id="rfc.section.C.p.12">The <a href="#header.max-forwards" class="smpl">Max-Forwards</a> header field is now restricted to the OPTIONS and TRACE methods (previously, extension methods could have used it as well).
    41114115         (<a href="#header.max-forwards" id="rfc.xref.header.max-forwards.5" title="Max-Forwards">Section&nbsp;6.1.1</a>)
    41124116      </p>
    4113       <p id="rfc.section.C.p.12">The ABNF for the "<a href="#header.expect" class="smpl">Expect</a>" header field has been both fixed (allowing parameters for value-less expectations as well) and simplified (allowing trailing
     4117      <p id="rfc.section.C.p.13">The ABNF for the "<a href="#header.expect" class="smpl">Expect</a>" header field has been both fixed (allowing parameters for value-less expectations as well) and simplified (allowing trailing
    41144118         semicolons after "100-continue" when they were invalid before). (<a href="#header.expect" id="rfc.xref.header.expect.4" title="Expect">Section&nbsp;6.1.2</a>)
    41154119      </p>
    4116       <p id="rfc.section.C.p.13">Special casing for ISO-8859-1 in <a href="#header.accept-charset" class="smpl">Accept-Charset</a> has been removed. (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.4" title="Accept-Charset">Section&nbsp;6.3.3</a>)
    4117       </p>
    4118       <p id="rfc.section.C.p.14">Requirements for sending the Date header field have been clarified. (<a href="#header.date" id="rfc.xref.header.date.4" title="Date">Section&nbsp;8.1.1.2</a>)
    4119       </p>
    4120       <p id="rfc.section.C.p.15">The <a href="#header.referer" class="smpl">Referer</a> header field can now have a value of "about:blank" as an alternative to not sending a Referer header field. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;6.5.2</a>)
    4121       </p>
    4122       <p id="rfc.section.C.p.16">The <a href="#status.201" class="smpl">201 (Created)</a> status code can indicate that more than one resource has been created (as well as just one).
    4123       </p>
    4124       <p id="rfc.section.C.p.17">The definition of <a href="#status.203" class="smpl">203 (Non-Authoritative Information)</a> has been broadened to include cases of payload transformations as well. (<a href="#status.203" id="rfc.xref.status.203.3" title="203 Non-Authoritative Information">Section&nbsp;7.3.4</a>)
    4125       </p>
    4126       <p id="rfc.section.C.p.18">Redirect status codes <a href="#status.301" class="smpl">301</a>, <a href="#status.302" class="smpl">302</a>, and <a href="#status.307" class="smpl">307</a> no longer have normative requirements on response payloads and user interaction. (<a href="#status.3xx" id="rfc.xref.status.3xx.1" title="Redirection 3xx">Section&nbsp;7.4</a>)
    4127       </p>
    4128       <p id="rfc.section.C.p.19">The request methods that are safe to automatically redirect is no longer a closed set; user agents are able to make that determination
     4120      <p id="rfc.section.C.p.14">Special casing for ISO-8859-1 in <a href="#header.accept-charset" class="smpl">Accept-Charset</a> has been removed. (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.4" title="Accept-Charset">Section&nbsp;6.3.3</a>)
     4121      </p>
     4122      <p id="rfc.section.C.p.15">Requirements for sending the Date header field have been clarified. (<a href="#header.date" id="rfc.xref.header.date.4" title="Date">Section&nbsp;8.1.1.2</a>)
     4123      </p>
     4124      <p id="rfc.section.C.p.16">The <a href="#header.referer" class="smpl">Referer</a> header field can now have a value of "about:blank" as an alternative to not sending a Referer header field. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;6.5.2</a>)
     4125      </p>
     4126      <p id="rfc.section.C.p.17">The <a href="#status.201" class="smpl">201 (Created)</a> status code can indicate that more than one resource has been created (as well as just one).
     4127      </p>
     4128      <p id="rfc.section.C.p.18">The definition of <a href="#status.203" class="smpl">203 (Non-Authoritative Information)</a> has been broadened to include cases of payload transformations as well. (<a href="#status.203" id="rfc.xref.status.203.3" title="203 Non-Authoritative Information">Section&nbsp;7.3.4</a>)
     4129      </p>
     4130      <p id="rfc.section.C.p.19">Redirect status codes <a href="#status.301" class="smpl">301</a>, <a href="#status.302" class="smpl">302</a>, and <a href="#status.307" class="smpl">307</a> no longer have normative requirements on response payloads and user interaction. (<a href="#status.3xx" id="rfc.xref.status.3xx.1" title="Redirection 3xx">Section&nbsp;7.4</a>)
     4131      </p>
     4132      <p id="rfc.section.C.p.20">The request methods that are safe to automatically redirect is no longer a closed set; user agents are able to make that determination
    41294133         based upon the request method semantics. (<a href="#status.3xx" id="rfc.xref.status.3xx.2" title="Redirection 3xx">Section&nbsp;7.4</a>)
    41304134      </p>
    4131       <p id="rfc.section.C.p.20">The syntax of the <a href="#header.location" class="smpl">Location</a> header field has been corrected to allow URI references (including relative references and fragments), along with some clarifications
     4135      <p id="rfc.section.C.p.21">The syntax of the <a href="#header.location" class="smpl">Location</a> header field has been corrected to allow URI references (including relative references and fragments), along with some clarifications
    41324136         as to when use of fragments would not be appropriate. (<a href="#header.location" id="rfc.xref.header.location.5" title="Location">Section&nbsp;8.1.2</a>)
    41334137      </p>
    4134       <p id="rfc.section.C.p.21">The 303 (See Other) status code is now cacheable, if explicit freshness information is available. (<a href="#status.303" id="rfc.xref.status.303.3" title="303 See Other">Section&nbsp;7.4.4</a>)
    4135       </p>
    4136       <p id="rfc.section.C.p.22">User agents are now allowed to rewrite the method from POST to GET for status codes <a href="#status.301" class="smpl">301</a> and <a href="#status.302" class="smpl">302</a>. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">7.4.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">7.4.3</a> and <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">7.4.7</a>)
    4137       </p>
    4138       <p id="rfc.section.C.p.23">The <a href="#status.305" class="smpl">305 (Use Proxy)</a> status code is now deprecated, because user agents did not implement it. It used to indicate that the target resource needed
     4138      <p id="rfc.section.C.p.22">The 303 (See Other) status code is now cacheable, if explicit freshness information is available. (<a href="#status.303" id="rfc.xref.status.303.3" title="303 See Other">Section&nbsp;7.4.4</a>)
     4139      </p>
     4140      <p id="rfc.section.C.p.23">User agents are now allowed to rewrite the method from POST to GET for status codes <a href="#status.301" class="smpl">301</a> and <a href="#status.302" class="smpl">302</a>. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">7.4.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">7.4.3</a> and <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">7.4.7</a>)
     4141      </p>
     4142      <p id="rfc.section.C.p.24">The <a href="#status.305" class="smpl">305 (Use Proxy)</a> status code is now deprecated, because user agents did not implement it. It used to indicate that the target resource needed
    41394143         to be accessed through the proxy given by the <a href="#header.location" class="smpl">Location</a> field. The recipient was expected to repeat this single request via the proxy. (<a href="#status.305" id="rfc.xref.status.305.3" title="305 Use Proxy">Section&nbsp;7.4.5</a>)
    41404144      </p>
    4141       <p id="rfc.section.C.p.24">The <a href="#status.400" class="smpl">400 (Bad Request)</a> status code has been made more generic; it isn't limited to syntax errors. (<a href="#status.400" id="rfc.xref.status.400.3" title="400 Bad Request">Section&nbsp;7.5.1</a>)
    4142       </p>
    4143       <p id="rfc.section.C.p.25">The <a href="#status.403" class="smpl">403 (Forbidden)</a> status code has been clarified, especially with regards to authentication. (<a href="#status.403" id="rfc.xref.status.403.3" title="403 Forbidden">Section&nbsp;7.5.3</a>)
    4144       </p>
    4145       <p id="rfc.section.C.p.26">The <a href="#status.426" class="smpl">426 (Upgrade Required)</a> status code has been incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.3"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#status.426" id="rfc.xref.status.426.3" title="426 Upgrade Required">Section&nbsp;7.5.15</a>)
    4146       </p>
    4147       <p id="rfc.section.C.p.27"> <a href="#header.allow" class="smpl">Allow</a> has been reclassified as a response header field, removing the option to specify it in a PUT request. (<a href="#header.allow" id="rfc.xref.header.allow.4" title="Allow">Section&nbsp;8.4.1</a>)
    4148       </p>
    4149       <p id="rfc.section.C.p.28">Requirements relating to the content of the Allow header have been relaxed; correspondingly, clients are not required to always
     4145      <p id="rfc.section.C.p.25">The <a href="#status.400" class="smpl">400 (Bad Request)</a> status code has been made more generic; it isn't limited to syntax errors. (<a href="#status.400" id="rfc.xref.status.400.3" title="400 Bad Request">Section&nbsp;7.5.1</a>)
     4146      </p>
     4147      <p id="rfc.section.C.p.26">The <a href="#status.403" class="smpl">403 (Forbidden)</a> status code has been clarified, especially with regards to authentication. (<a href="#status.403" id="rfc.xref.status.403.3" title="403 Forbidden">Section&nbsp;7.5.3</a>)
     4148      </p>
     4149      <p id="rfc.section.C.p.27">The <a href="#status.426" class="smpl">426 (Upgrade Required)</a> status code has been incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.3"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#status.426" id="rfc.xref.status.426.3" title="426 Upgrade Required">Section&nbsp;7.5.15</a>)
     4150      </p>
     4151      <p id="rfc.section.C.p.28"> <a href="#header.allow" class="smpl">Allow</a> has been reclassified as a response header field, removing the option to specify it in a PUT request. (<a href="#header.allow" id="rfc.xref.header.allow.4" title="Allow">Section&nbsp;8.4.1</a>)
     4152      </p>
     4153      <p id="rfc.section.C.p.29">Requirements relating to the content of the Allow header have been relaxed; correspondingly, clients are not required to always
    41504154         trust its value. (<a href="#header.allow" id="rfc.xref.header.allow.5" title="Allow">Section&nbsp;8.4.1</a>)
    41514155      </p>
    4152       <p id="rfc.section.C.p.29">The requirement to produce a <a href="p1-messaging.html#header.via" class="smpl">Via</a> header field has been moved from the description of the <a href="#header.server" class="smpl">Server</a> header field to <a href="p1-messaging.html#header.via" title="Via">Section 5.7</a> of <a href="#Part1" id="rfc.xref.Part1.44"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section&nbsp;8.4.2</a>)
    4153       </p>
    4154       <p id="rfc.section.C.p.30">The contexts that charset is used in have been clarified. (<a href="#charset" title="Charset">Section&nbsp;3.1.1.2</a>)
    4155       </p>
    4156       <p id="rfc.section.C.p.31">The default charset of "ISO-8859-1" for text media types has been removed; the default now is whatever the media type definition
     4156      <p id="rfc.section.C.p.30">The requirement to produce a <a href="p1-messaging.html#header.via" class="smpl">Via</a> header field has been moved from the description of the <a href="#header.server" class="smpl">Server</a> header field to <a href="p1-messaging.html#header.via" title="Via">Section 5.7</a> of <a href="#Part1" id="rfc.xref.Part1.44"><cite title="Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section&nbsp;8.4.2</a>)
     4157      </p>
     4158      <p id="rfc.section.C.p.31">The contexts that charset is used in have been clarified. (<a href="#charset" title="Charset">Section&nbsp;3.1.1.2</a>)
     4159      </p>
     4160      <p id="rfc.section.C.p.32">The default charset of "ISO-8859-1" for text media types has been removed; the default now is whatever the media type definition
    41574161         says. (<a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;3.1.1.3</a>)
    41584162      </p>
    4159       <p id="rfc.section.C.p.32">Registration of Content Codings now requires IETF Review. (<a href="#content.coding.registry" title="Content Coding Registry">Section&nbsp;9.4</a>)
    4160       </p>
    4161       <p id="rfc.section.C.p.33">The Content-MD5 header field has been removed, because it was inconsistently implemented with respect to partial responses,
     4163      <p id="rfc.section.C.p.33">Registration of Content Codings now requires IETF Review. (<a href="#content.coding.registry" title="Content Coding Registry">Section&nbsp;9.4</a>)
     4164      </p>
     4165      <p id="rfc.section.C.p.34">The Content-MD5 header field has been removed, because it was inconsistently implemented with respect to partial responses,
    41624166         and also because of known deficiencies in the hash algorithm itself (see <a href="#RFC6151" id="rfc.xref.RFC6151.1"><cite title="Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms">[RFC6151]</cite></a> for details).
    41634167      </p>
    4164       <p id="rfc.section.C.p.34">This specification introduces a Method Registry. (<a href="#method.registry" title="Method Registry">Section&nbsp;9.1</a>)
    4165       </p>
    4166       <p id="rfc.section.C.p.35">The Status Code Registry is now defined by this specification; previously, it was defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.4"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#status.code.registry" title="Status Code Registry">Section&nbsp;9.2</a>)
    4167       </p>
    4168       <p id="rfc.section.C.p.36">References to the "identity" transfer-coding value token have been removed. (<a href="#no.content-transfer-encoding" id="rfc.xref.no.content-transfer-encoding.1" title="No Content-Transfer-Encoding">Appendix&nbsp;A.5</a>)
    4169       </p>
    4170       <p id="rfc.section.C.p.37">The Content-Disposition header field is now defined by <a href="#RFC6266" id="rfc.xref.RFC6266.2"><cite title="Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)">[RFC6266]</cite></a>. (<a href="#additional.features" title="Additional Features">Appendix&nbsp;B</a>)
     4168      <p id="rfc.section.C.p.35">This specification introduces a Method Registry. (<a href="#method.registry" title="Method Registry">Section&nbsp;9.1</a>)
     4169      </p>
     4170      <p id="rfc.section.C.p.36">The Status Code Registry is now defined by this specification; previously, it was defined in <a href="http://tools.ietf.org/html/rfc2817#section-7.1">Section 7.1</a> of <a href="#RFC2817" id="rfc.xref.RFC2817.4"><cite title="Upgrading to TLS Within HTTP/1.1">[RFC2817]</cite></a>. (<a href="#status.code.registry" title="Status Code Registry">Section&nbsp;9.2</a>)
     4171      </p>
     4172      <p id="rfc.section.C.p.37">References to the "identity" transfer-coding value token have been removed. (<a href="#no.content-transfer-encoding" id="rfc.xref.no.content-transfer-encoding.1" title="No Content-Transfer-Encoding">Appendix&nbsp;A.5</a>)
     4173      </p>
     4174      <p id="rfc.section.C.p.38">The Content-Disposition header field is now defined by <a href="#RFC6266" id="rfc.xref.RFC6266.2"><cite title="Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)">[RFC6266]</cite></a>. (<a href="#additional.features" title="Additional Features">Appendix&nbsp;B</a>)
    41714175      </p>
    41724176      <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="imported.abnf" href="#imported.abnf">Imported ABNF</a></h1>
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