Changeset 398 for draft-ietf-httpbis/latest/p2-semantics.html
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- 15/11/08 15:25:49 (14 years ago)
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draft-ietf-httpbis/latest/p2-semantics.html
r391 r398 678 678 <a href="#notation" class="smpl">DIGIT</a> = <DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 679 679 <a href="#notation" class="smpl">LF</a> = <LF, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 680 </pre><div id="rfc.figure.u.2"></div><pre class="inline"> <a href="#notation" class="smpl">comment</a> = <comment, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 681 <a href="#notation" class="smpl">quoted-string</a> = <quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 682 <a href="#notation" class="smpl">token</a> = <token, defined in <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 683 <a href="#notation" class="smpl">OWS</a> = <OWS, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 684 <a href="#notation" class="smpl">RWS</a> = <RWS, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 685 <a href="#notation" class="smpl">TEXT</a> = <TEXT, defined in <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 680 <a href="#notation" class="smpl">VCHAR</a> = <VCHAR, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 681 <a href="#notation" class="smpl">WSP</a> = <WSP, defined in <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 682 </pre><div id="rfc.figure.u.2"></div><pre class="inline"> <a href="#notation" class="smpl">comment</a> = <comment, defined in <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 683 <a href="#notation" class="smpl">quoted-string</a> = <quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 684 <a href="#notation" class="smpl">token</a> = <token, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 685 <a href="#notation" class="smpl">OWS</a> = <OWS, defined in <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 686 <a href="#notation" class="smpl">RWS</a> = <RWS, defined in <a href="#Part1" id="rfc.xref.Part1.13"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 687 <a href="#notation" class="smpl">obs-text</a> = <obs-text, defined in <a href="#Part1" id="rfc.xref.Part1.14"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 1.2.2</a>> 686 688 </pre><div id="abnf.dependencies"> 687 689 <p id="rfc.section.2.p.4"> The ABNF rules below are defined in other parts:</p> 688 690 </div> 689 <div id="rfc.figure.u.3"></div><pre class="inline"> <a href="#abnf.dependencies" class="smpl">absolute-URI</a> = <absolute-URI, defined in <a href="#Part1" id="rfc.xref.Part1.1 3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>>690 <a href="#abnf.dependencies" class="smpl">fragment</a> = <fragment, defined in <a href="#Part1" id="rfc.xref.Part1.1 4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>>691 <a href="#abnf.dependencies" class="smpl">Host</a> = <Host, defined in <a href="#Part1" id="rfc.xref.Part1.1 5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>>692 <a href="#abnf.dependencies" class="smpl">HTTP-date</a> = <HTTP-date, defined in <a href="#Part1" id="rfc.xref.Part1.1 6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#full.date" title="Full Date">Section 3.2.1</a>>693 <a href="#abnf.dependencies" class="smpl">partial-URI</a> = <partial-URI, defined in <a href="#Part1" id="rfc.xref.Part1.1 7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>>694 <a href="#abnf.dependencies" class="smpl">product</a> = <product, defined in <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#product.tokens" title="Product Tokens">Section 3.4</a>>695 <a href="#abnf.dependencies" class="smpl">TE</a> = <TE, defined in <a href="#Part1" id="rfc.xref.Part1. 19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>>691 <div id="rfc.figure.u.3"></div><pre class="inline"> <a href="#abnf.dependencies" class="smpl">absolute-URI</a> = <absolute-URI, defined in <a href="#Part1" id="rfc.xref.Part1.15"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>> 692 <a href="#abnf.dependencies" class="smpl">fragment</a> = <fragment, defined in <a href="#Part1" id="rfc.xref.Part1.16"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>> 693 <a href="#abnf.dependencies" class="smpl">Host</a> = <Host, defined in <a href="#Part1" id="rfc.xref.Part1.17"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>> 694 <a href="#abnf.dependencies" class="smpl">HTTP-date</a> = <HTTP-date, defined in <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#full.date" title="Full Date">Section 3.2.1</a>> 695 <a href="#abnf.dependencies" class="smpl">partial-URI</a> = <partial-URI, defined in <a href="#Part1" id="rfc.xref.Part1.19"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.1</a>> 696 <a href="#abnf.dependencies" class="smpl">product</a> = <product, defined in <a href="#Part1" id="rfc.xref.Part1.20"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 3.4</a>> 697 <a href="#abnf.dependencies" class="smpl">TE</a> = <TE, defined in <a href="#Part1" id="rfc.xref.Part1.21"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>> 696 698 </pre><div id="rfc.figure.u.4"></div><pre class="inline"> <a href="#abnf.dependencies" class="smpl">Accept</a> = <Accept, defined in <a href="#Part3" id="rfc.xref.Part3.1"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>, <a href="p3-payload.html#header.accept" title="Accept">Section 6.1</a>> 697 699 <a href="#abnf.dependencies" class="smpl">Accept-Charset</a> = … … 765 767 / <a href="#header.expect" class="smpl">Expect</a> ; <a href="#header.expect" id="rfc.xref.header.expect.1" title="Expect">Section 10.2</a> 766 768 / <a href="#header.from" class="smpl">From</a> ; <a href="#header.from" id="rfc.xref.header.from.1" title="From">Section 10.3</a> 767 / <a href="#abnf.dependencies" class="smpl">Host</a> ; <a href="#Part1" id="rfc.xref.Part1.2 0"><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 8.4</a>769 / <a href="#abnf.dependencies" class="smpl">Host</a> ; <a href="#Part1" id="rfc.xref.Part1.22"><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 8.4</a> 768 770 / <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 7.2</a> 769 771 / <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 7.3</a> … … 775 777 / <a href="#abnf.dependencies" class="smpl">Range</a> ; <a href="#Part5" id="rfc.xref.Part5.5"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.range" title="Range">Section 6.4</a> 776 778 / <a href="#header.referer" class="smpl">Referer</a> ; <a href="#header.referer" id="rfc.xref.header.referer.1" title="Referer">Section 10.6</a> 777 / <a href="#abnf.dependencies" class="smpl">TE</a> ; <a href="#Part1" id="rfc.xref.Part1.2 1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a>779 / <a href="#abnf.dependencies" class="smpl">TE</a> ; <a href="#Part1" id="rfc.xref.Part1.23"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.upgrade" title="Upgrade">Section 8.8</a> 778 780 / <a href="#header.user-agent" class="smpl">User-Agent</a> ; <a href="#header.user-agent" id="rfc.xref.header.user-agent.1" title="User-Agent">Section 10.9</a> 779 781 </pre><p id="rfc.section.4.p.3">Request-header field names can be extended reliably only in combination with a change in the protocol version. However, new … … 833 835 834 836 <a href="#request.header.fields" class="smpl">extension-code</a> = 3<a href="#notation" class="smpl">DIGIT</a> 835 <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> = * <<a href="#notation" class="smpl">TEXT</a>, excluding <a href="#notation" class="smpl">CR</a>, <a href="#notation" class="smpl">LF</a>>837 <a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> = *( <a href="#notation" class="smpl">WSP</a> / <a href="#notation" class="smpl">VCHAR</a> / <a href="#notation" class="smpl">obs-text</a> ) 836 838 </pre><p id="rfc.section.5.p.4">HTTP status codes are extensible. HTTP applications are not required to understand the meaning of all registered status codes, 837 839 though such understanding is obviously desirable. However, applications <em class="bcp14">MUST</em> understand the class of any status code, as indicated by the first digit, and treat any unrecognized response as being equivalent … … 871 873 fields are defined in <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>. 872 874 </p> 873 <p id="rfc.section.7.p.2">An entity-body is only present in a message when a message-body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.2 2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure875 <p id="rfc.section.7.p.2">An entity-body is only present in a message when a message-body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.24"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure 874 876 safe and proper transfer of the message. 875 877 </p> … … 1036 1038 </p> 1037 1039 <p id="rfc.section.8.8.p.2">TRACE allows the client to see what is being received at the other end of the request chain and use that data for testing 1038 or diagnostic information. The value of the Via header field (<a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1.2 3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the Max-Forwards header field allows the1040 or diagnostic information. The value of the Via header field (<a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1.25"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) is of particular interest, since it acts as a trace of the request chain. Use of the Max-Forwards header field allows the 1039 1041 client to limit the length of the request chain, which is useful for testing a chain of proxies forwarding messages in an 1040 1042 infinite loop. 1041 1043 </p> 1042 <p id="rfc.section.8.8.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> contain the entire request message in the entity-body, with a Content-Type of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 9.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.2 4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Responses to this method <em class="bcp14">MUST NOT</em> be cached.1044 <p id="rfc.section.8.8.p.3">If the request is valid, the response <em class="bcp14">SHOULD</em> contain the entire request message in the entity-body, with a Content-Type of "message/http" (see <a href="p1-messaging.html#internet.media.type.message.http" title="Internet Media Type message/http">Section 9.3.1</a> of <a href="#Part1" id="rfc.xref.Part1.26"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Responses to this method <em class="bcp14">MUST NOT</em> be cached. 1043 1045 </p> 1044 1046 <div id="rfc.iref.c.1"></div> … … 1069 1071 <p id="rfc.section.9.1.1.p.1">The client <em class="bcp14">SHOULD</em> continue with its request. This interim response is used to inform the client that the initial part of the request has been 1070 1072 received and has not yet been rejected by the server. The client <em class="bcp14">SHOULD</em> continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The 1071 server <em class="bcp14">MUST</em> send a final response after the request has been completed. See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.2 5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for detailed discussion of the use and handling of this status code.1073 server <em class="bcp14">MUST</em> send a final response after the request has been completed. See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.27"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for detailed discussion of the use and handling of this status code. 1072 1074 </p> 1073 1075 <div id="rfc.iref.26"></div> … … 1452 1454 <p id="rfc.section.9.5.6.p.1">The server does not support, or refuses to support, the protocol version that was used in the request message. The server 1453 1455 is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described 1454 in <a href="p1-messaging.html#http.version" title="HTTP Version">Section 3.1</a> of <a href="#Part1" id="rfc.xref.Part1.2 6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, other than with this error message. The response <em class="bcp14">SHOULD</em> contain an entity describing why that version is not supported and what other protocols are supported by that server.1456 in <a href="p1-messaging.html#http.version" title="HTTP Version">Section 3.1</a> of <a href="#Part1" id="rfc.xref.Part1.28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, other than with this error message. The response <em class="bcp14">SHOULD</em> contain an entity describing why that version is not supported and what other protocols are supported by that server. 1455 1457 </p> 1456 1458 <h1 id="rfc.section.10"><a href="#rfc.section.10">10.</a> <a id="header.fields" href="#header.fields">Header Field Definitions</a></h1> … … 1498 1500 </p> 1499 1501 <p id="rfc.section.10.2.p.7">Many older HTTP/1.0 and HTTP/1.1 applications do not understand the Expect header.</p> 1500 <p id="rfc.section.10.2.p.8">See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.2 7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for the use of the 100 (Continue) status.1502 <p id="rfc.section.10.2.p.8">See <a href="p1-messaging.html#use.of.the.100.status" title="Use of the 100 (Continue) Status">Section 7.2.3</a> of <a href="#Part1" id="rfc.xref.Part1.29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> for the use of the 100 (Continue) status. 1501 1503 </p> 1502 1504 <div id="rfc.iref.f.1"></div> … … 1598 1600 <h2 id="rfc.section.10.8"><a href="#rfc.section.10.8">10.8</a> <a id="header.server" href="#header.server">Server</a></h2> 1599 1601 <p id="rfc.section.10.8.p.1">The response-header field "Server" contains information about the software used by the origin server to handle the request. 1600 The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 3.4</a> of <a href="#Part1" id="rfc.xref.Part1. 28"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and comments identifying the server and any significant subproducts. The product tokens are listed in order of their significance1602 The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 3.4</a> of <a href="#Part1" id="rfc.xref.Part1.30"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and comments identifying the server and any significant subproducts. The product tokens are listed in order of their significance 1601 1603 for identifying the application. 1602 1604 </p> … … 1606 1608 </pre><p id="rfc.section.10.8.p.3">Example:</p> 1607 1609 <div id="rfc.figure.u.27"></div><pre class="text"> Server: CERN/3.0 libwww/2.17 1608 </pre><p id="rfc.section.10.8.p.5">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server response-header. Instead, it <em class="bcp14">MUST</em> include a Via field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1. 29"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>).1610 </pre><p id="rfc.section.10.8.p.5">If the response is being forwarded through a proxy, the proxy application <em class="bcp14">MUST NOT</em> modify the Server response-header. Instead, it <em class="bcp14">MUST</em> include a Via field (as described in <a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1.31"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). 1609 1611 </p> 1610 1612 <dl class="empty"> … … 1619 1621 <p id="rfc.section.10.9.p.1">The request-header field "User-Agent" contains information about the user agent originating the request. This is for statistical 1620 1622 purposes, the tracing of protocol violations, and automated recognition of user agents for the sake of tailoring responses 1621 to avoid particular user agent limitations. User agents <em class="bcp14">SHOULD</em> include this field with requests. The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 3.4</a> of <a href="#Part1" id="rfc.xref.Part1.3 0"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and comments identifying the agent and any subproducts which form a significant part of the user agent. By convention, the1623 to avoid particular user agent limitations. User agents <em class="bcp14">SHOULD</em> include this field with requests. The field can contain multiple product tokens (<a href="p1-messaging.html#product.tokens" title="Product Tokens">Section 3.4</a> of <a href="#Part1" id="rfc.xref.Part1.32"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>) and comments identifying the agent and any subproducts which form a significant part of the user agent. By convention, the 1622 1624 product tokens are listed in order of their significance for identifying the application. 1623 1625 </p> … … 2233 2235 </p> 2234 2236 <p id="rfc.section.A.2.p.7">In the description of the Server header, the Via field was described as a SHOULD. The requirement was and is stated correctly 2235 in the description of the Via header in <a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1.3 1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section 10.8</a>)2237 in the description of the Via header in <a href="p1-messaging.html#header.via" title="Via">Section 8.9</a> of <a href="#Part1" id="rfc.xref.Part1.33"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. (<a href="#header.server" id="rfc.xref.header.server.4" title="Server">Section 10.8</a>) 2236 2238 </p> 2237 2239 <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a> <a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1> … … 2341 2343 </ul> 2342 2344 <h2 id="rfc.section.B.7"><a href="#rfc.section.B.7">B.7</a> <a id="changes.since.05" href="#changes.since.05">Since draft-ietf-httpbis-p2-semantics-05</a></h2> 2345 <p id="rfc.section.B.7.p.1">Closed issues: </p> 2346 <ul> 2347 <li> <<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/94">http://tools.ietf.org/wg/httpbis/trac/ticket/94</a>>: "Reason-Phrase BNF" 2348 </li> 2349 </ul> 2343 2350 <h1><a id="rfc.copyright" href="#rfc.copyright">Full Copyright Statement</a></h1> 2344 2351 <p>This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the … … 2533 2540 </li> 2534 2541 <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind"> 2535 <li class="indline1"><em>Part1</em> <a class="iref" href="#rfc.xref.Part1.1">1</a>, <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a>, <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.12">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a>, <a class="iref" href="#rfc.xref.Part1.14">2</a>, <a class="iref" href="#rfc.xref.Part1.15">2</a>, <a class="iref" href="#rfc.xref.Part1.16">2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.18">2</a>, <a class="iref" href="#rfc.xref.Part1.19">2</a>, <a class="iref" href="#rfc.xref.Part1.20"> 4</a>, <a class="iref" href="#rfc.xref.Part1.21">4</a>, <a class="iref" href="#rfc.xref.Part1.22">7</a>, <a class="iref" href="#rfc.xref.Part1.23">8.8</a>, <a class="iref" href="#rfc.xref.Part1.24">8.8</a>, <a class="iref" href="#rfc.xref.Part1.25">9.1.1</a>, <a class="iref" href="#rfc.xref.Part1.26">9.5.6</a>, <a class="iref" href="#rfc.xref.Part1.27">10.2</a>, <a class="iref" href="#rfc.xref.Part1.28">10.8</a>, <a class="iref" href="#rfc.xref.Part1.29">10.8</a>, <a class="iref" href="#rfc.xref.Part1.30">10.9</a>, <a class="iref" href="#Part1"><b>14.1</b></a>, <a class="iref" href="#rfc.xref.Part1.31">A.2</a><ul class="ind">2542 <li class="indline1"><em>Part1</em> <a class="iref" href="#rfc.xref.Part1.1">1</a>, <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a>, <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.12">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a>, <a class="iref" href="#rfc.xref.Part1.14">2</a>, <a class="iref" href="#rfc.xref.Part1.15">2</a>, <a class="iref" href="#rfc.xref.Part1.16">2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.18">2</a>, <a class="iref" href="#rfc.xref.Part1.19">2</a>, <a class="iref" href="#rfc.xref.Part1.20">2</a>, <a class="iref" href="#rfc.xref.Part1.21">2</a>, <a class="iref" href="#rfc.xref.Part1.22">4</a>, <a class="iref" href="#rfc.xref.Part1.23">4</a>, <a class="iref" href="#rfc.xref.Part1.24">7</a>, <a class="iref" href="#rfc.xref.Part1.25">8.8</a>, <a class="iref" href="#rfc.xref.Part1.26">8.8</a>, <a class="iref" href="#rfc.xref.Part1.27">9.1.1</a>, <a class="iref" href="#rfc.xref.Part1.28">9.5.6</a>, <a class="iref" href="#rfc.xref.Part1.29">10.2</a>, <a class="iref" href="#rfc.xref.Part1.30">10.8</a>, <a class="iref" href="#rfc.xref.Part1.31">10.8</a>, <a class="iref" href="#rfc.xref.Part1.32">10.9</a>, <a class="iref" href="#Part1"><b>14.1</b></a>, <a class="iref" href="#rfc.xref.Part1.33">A.2</a><ul class="ind"> 2536 2543 <li class="indline1"><em>Section 1.2.1</em> <a class="iref" href="#rfc.xref.Part1.2">2</a></li> 2537 <li class="indline1"><em>Section 1.2.2</em> <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a>, <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.12">2</a> </li>2538 <li class="indline1"><em>Section 2.1</em> <a class="iref" href="#rfc.xref.Part1.1 3">2</a>, <a class="iref" href="#rfc.xref.Part1.14">2</a>, <a class="iref" href="#rfc.xref.Part1.15">2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a></li>2539 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part1.2 6">9.5.6</a></li>2540 <li class="indline1"><em>Section 3.2.1</em> <a class="iref" href="#rfc.xref.Part1.1 6">2</a></li>2541 <li class="indline1"><em>Section 3.4</em> <a class="iref" href="#rfc.xref.Part1. 18">2</a>, <a class="iref" href="#rfc.xref.Part1.28">10.8</a>, <a class="iref" href="#rfc.xref.Part1.30">10.9</a></li>2542 <li class="indline1"><em>Section 4.3</em> <a class="iref" href="#rfc.xref.Part1.2 2">7</a></li>2543 <li class="indline1"><em>Section 7.2.3</em> <a class="iref" href="#rfc.xref.Part1.2 5">9.1.1</a>, <a class="iref" href="#rfc.xref.Part1.27">10.2</a></li>2544 <li class="indline1"><em>Section 8.4</em> <a class="iref" href="#rfc.xref.Part1.2 0">4</a></li>2545 <li class="indline1"><em>Section 8.8</em> <a class="iref" href="#rfc.xref.Part1. 19">2</a>, <a class="iref" href="#rfc.xref.Part1.21">4</a></li>2546 <li class="indline1"><em>Section 8.9</em> <a class="iref" href="#rfc.xref.Part1.2 3">8.8</a>, <a class="iref" href="#rfc.xref.Part1.29">10.8</a>, <a class="iref" href="#rfc.xref.Part1.31">A.2</a></li>2547 <li class="indline1"><em>Section 9.3.1</em> <a class="iref" href="#rfc.xref.Part1.2 4">8.8</a></li>2544 <li class="indline1"><em>Section 1.2.2</em> <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">2</a>, <a class="iref" href="#rfc.xref.Part1.9">2</a>, <a class="iref" href="#rfc.xref.Part1.10">2</a>, <a class="iref" href="#rfc.xref.Part1.11">2</a>, <a class="iref" href="#rfc.xref.Part1.12">2</a>, <a class="iref" href="#rfc.xref.Part1.13">2</a>, <a class="iref" href="#rfc.xref.Part1.14">2</a></li> 2545 <li class="indline1"><em>Section 2.1</em> <a class="iref" href="#rfc.xref.Part1.15">2</a>, <a class="iref" href="#rfc.xref.Part1.16">2</a>, <a class="iref" href="#rfc.xref.Part1.17">2</a>, <a class="iref" href="#rfc.xref.Part1.19">2</a></li> 2546 <li class="indline1"><em>Section 3.1</em> <a class="iref" href="#rfc.xref.Part1.28">9.5.6</a></li> 2547 <li class="indline1"><em>Section 3.2.1</em> <a class="iref" href="#rfc.xref.Part1.18">2</a></li> 2548 <li class="indline1"><em>Section 3.4</em> <a class="iref" href="#rfc.xref.Part1.20">2</a>, <a class="iref" href="#rfc.xref.Part1.30">10.8</a>, <a class="iref" href="#rfc.xref.Part1.32">10.9</a></li> 2549 <li class="indline1"><em>Section 4.3</em> <a class="iref" href="#rfc.xref.Part1.24">7</a></li> 2550 <li class="indline1"><em>Section 7.2.3</em> <a class="iref" href="#rfc.xref.Part1.27">9.1.1</a>, <a class="iref" href="#rfc.xref.Part1.29">10.2</a></li> 2551 <li class="indline1"><em>Section 8.4</em> <a class="iref" href="#rfc.xref.Part1.22">4</a></li> 2552 <li class="indline1"><em>Section 8.8</em> <a class="iref" href="#rfc.xref.Part1.21">2</a>, <a class="iref" href="#rfc.xref.Part1.23">4</a></li> 2553 <li class="indline1"><em>Section 8.9</em> <a class="iref" href="#rfc.xref.Part1.25">8.8</a>, <a class="iref" href="#rfc.xref.Part1.31">10.8</a>, <a class="iref" href="#rfc.xref.Part1.33">A.2</a></li> 2554 <li class="indline1"><em>Section 9.3.1</em> <a class="iref" href="#rfc.xref.Part1.26">8.8</a></li> 2548 2555 </ul> 2549 2556 </li>
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