Ignore:
Timestamp:
Mar 30, 2011, 2:16:53 AM (9 years ago)
Author:
julian.reschke@…
Message:

rewrite header field ABNFs to only specify the field value (see #276)

File:
1 edited

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

    r1228 r1235  
    359359  }
    360360  @bottom-center {
    361        content: "Expires September 30, 2011";
     361       content: "Expires October 1, 2011";
    362362  }
    363363  @bottom-right {
     
    409409      <meta name="dct.creator" content="Reschke, J. F.">
    410410      <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p2-semantics-latest">
    411       <meta name="dct.issued" scheme="ISO8601" content="2011-03-29">
     411      <meta name="dct.issued" scheme="ISO8601" content="2011-03-30">
    412412      <meta name="dct.replaces" content="urn:ietf:rfc:2616">
    413413      <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 2 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 2 defines the semantics of HTTP messages as expressed by request methods, request header fields, response status codes, and response header fields.">
     
    440440            </tr>
    441441            <tr>
    442                <td class="left">Expires: September 30, 2011</td>
     442               <td class="left">Expires: October 1, 2011</td>
    443443               <td class="right">HP</td>
    444444            </tr>
     
    493493            <tr>
    494494               <td class="left"></td>
    495                <td class="right">March 29, 2011</td>
     495               <td class="right">March 30, 2011</td>
    496496            </tr>
    497497         </tbody>
     
    520520         in progress”.
    521521      </p>
    522       <p>This Internet-Draft will expire on September 30, 2011.</p>
     522      <p>This Internet-Draft will expire on October 1, 2011.</p>
    523523      <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
    524524      <p>Copyright © 2011 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
     
    19441944         is strictly to inform the recipient of valid request methods associated with the resource.
    19451945      </p>
    1946       <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.6"></span><span id="rfc.iref.g.7"></span>  <a href="#header.allow" class="smpl">Allow</a>   = "Allow" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.allow" class="smpl">Allow-v</a>
    1947   <a href="#header.allow" class="smpl">Allow-v</a> = #<a href="#method" class="smpl">Method</a>
     1946      <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.6"></span>  <a href="#header.allow" class="smpl">Allow</a> = #<a href="#method" class="smpl">Method</a>
    19481947</pre><p id="rfc.section.9.1.p.3">Example of use:</p>
    19491948      <div id="rfc.figure.u.9"></div><pre class="text">  Allow: GET, HEAD, PUT
     
    19561955      <h2 id="rfc.section.9.2"><a href="#rfc.section.9.2">9.2</a>&nbsp;<a id="header.expect" href="#header.expect">Expect</a></h2>
    19571956      <p id="rfc.section.9.2.p.1">The "Expect" header field is used to indicate that particular server behaviors are required by the client.</p>
    1958       <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span><span id="rfc.iref.g.10"></span><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span>  <a href="#header.expect" class="smpl">Expect</a>       = "Expect" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.expect" class="smpl">Expect-v</a>
    1959   <a href="#header.expect" class="smpl">Expect-v</a>     = 1#<a href="#header.expect" class="smpl">expectation</a>
     1957      <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span><span id="rfc.iref.g.10"></span>  <a href="#header.expect" class="smpl">Expect</a>       = 1#<a href="#header.expect" class="smpl">expectation</a>
    19601958 
    19611959  <a href="#header.expect" class="smpl">expectation</a>  = "100-continue" / <a href="#header.expect" class="smpl">expectation-extension</a>
     
    19831981      <p id="rfc.section.9.3.p.1">The "From" header field, if given, <em class="bcp14">SHOULD</em> contain an Internet e-mail address for the human user who controls the requesting user agent. The address <em class="bcp14">SHOULD</em> be machine-usable, as defined by "mailbox" in <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a> of <a href="#RFC5322" id="rfc.xref.RFC5322.1"><cite title="Internet Message Format">[RFC5322]</cite></a>:
    19841982      </p>
    1985       <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.13"></span><span id="rfc.iref.g.14"></span>  <a href="#header.from" class="smpl">From</a>    = "From" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.from" class="smpl">From-v</a>
    1986   <a href="#header.from" class="smpl">From-v</a>  = <a href="#header.from" class="smpl">mailbox</a>
     1983      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.11"></span>  <a href="#header.from" class="smpl">From</a>    = <a href="#header.from" class="smpl">mailbox</a>
    19871984 
    19881985  <a href="#header.from" class="smpl">mailbox</a> = &lt;mailbox, defined in <a href="#RFC5322" id="rfc.xref.RFC5322.2"><cite title="Internet Message Format">[RFC5322]</cite></a>, <a href="http://tools.ietf.org/html/rfc5322#section-3.4">Section 3.4</a>&gt;
     
    20112008      <p id="rfc.section.9.4.p.3">The field value consists of a single URI-reference. When it has the form of a relative reference (<a href="#RFC3986" id="rfc.xref.RFC3986.1"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-4.2">Section 4.2</a>), the final value is computed by resolving it against the effective request URI (<a href="#RFC3986" id="rfc.xref.RFC3986.2"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-5">Section 5</a>).
    20122009      </p>
    2013       <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.15"></span><span id="rfc.iref.g.16"></span>  <a href="#header.location" class="smpl">Location</a>       = "Location" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.location" class="smpl">Location-v</a>
    2014   <a href="#header.location" class="smpl">Location-v</a>     = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
     2010      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.12"></span>  <a href="#header.location" class="smpl">Location</a> = <a href="#abnf.dependencies" class="smpl">URI-reference</a>
    20152011</pre><div id="rfc.figure.u.14"></div>
    20162012      <p>Examples are:</p>  <pre class="text">  Location: http://www.example.org/pub/WWW/People.html#tim
     
    20382034         to trace a request which appears to be failing or looping in mid-chain.
    20392035      </p>
    2040       <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a>   = "Max-Forwards" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a>
    2041   <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
     2036      <div id="rfc.figure.u.16"></div><pre class="inline"><span id="rfc.iref.g.13"></span>  <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*<a href="#notation" class="smpl">DIGIT</a>
    20422037</pre><p id="rfc.section.9.5.p.3">The Max-Forwards value is a decimal integer indicating the remaining number of times this request message can be forwarded.</p>
    20432038      <p id="rfc.section.9.5.p.4">Each recipient of a TRACE or OPTIONS request containing a Max-Forwards header field <em class="bcp14">MUST</em> check and update its value prior to forwarding the request. If the received value is zero (0), the recipient <em class="bcp14">MUST NOT</em> forward the request; instead, it <em class="bcp14">MUST</em> respond as the final recipient. If the received Max-Forwards value is greater than zero, then the forwarded message <em class="bcp14">MUST</em> contain an updated Max-Forwards field with a value decremented by one (1).
     
    20592054         non-HTTP URIs (e.g., FTP).
    20602055      </p>
    2061       <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  <a href="#header.referer" class="smpl">Referer</a>        = "Referer" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.referer" class="smpl">Referer-v</a>
    2062   <a href="#header.referer" class="smpl">Referer-v</a>      = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
     2056      <div id="rfc.figure.u.17"></div><pre class="inline"><span id="rfc.iref.g.14"></span>  <a href="#header.referer" class="smpl">Referer</a> = <a href="#abnf.dependencies" class="smpl">absolute-URI</a> / <a href="#abnf.dependencies" class="smpl">partial-URI</a>
    20632057</pre><p id="rfc.section.9.6.p.5">Example:</p>
    20642058      <div id="rfc.figure.u.18"></div><pre class="text">  Referer: http://www.example.org/hypertext/Overview.html
     
    20732067      </p>
    20742068      <p id="rfc.section.9.7.p.2">The value of this field can be either an HTTP-date or an integer number of seconds (in decimal) after the time of the response.</p>
    2075       <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.21"></span><span id="rfc.iref.g.22"></span>  <a href="#header.retry-after" class="smpl">Retry-After</a>   = "Retry-After" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.retry-after" class="smpl">Retry-After-v</a>
    2076   <a href="#header.retry-after" class="smpl">Retry-After-v</a> = <a href="#abnf.dependencies" class="smpl">HTTP-date</a> / <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>
     2069      <div id="rfc.figure.u.19"></div><pre class="inline"><span id="rfc.iref.g.15"></span>  <a href="#header.retry-after" class="smpl">Retry-After</a> = <a href="#abnf.dependencies" class="smpl">HTTP-date</a> / <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>
    20772070</pre><div id="rule.delta-seconds">
    20782071         <p id="rfc.section.9.7.p.4">  Time spans are non-negative decimal integers, representing time in seconds.</p>
    20792072      </div>
    2080       <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.23"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
     2073      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.16"></span>  <a href="#rule.delta-seconds" class="smpl">delta-seconds</a>  = 1*<a href="#notation" class="smpl">DIGIT</a>
    20812074</pre><p id="rfc.section.9.7.p.6">Two examples of its use are</p>
    20822075      <div id="rfc.figure.u.21"></div><pre class="text">  Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
     
    20902083         identifying the application.
    20912084      </p>
    2092       <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  <a href="#header.server" class="smpl">Server</a>         = "Server" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.server" class="smpl">Server-v</a>
    2093   <a href="#header.server" class="smpl">Server-v</a>       = <a href="#abnf.dependencies" class="smpl">product</a>
    2094                    *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
     2085      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.17"></span>  <a href="#header.server" class="smpl">Server</a> = <a href="#abnf.dependencies" class="smpl">product</a> *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    20952086</pre><p id="rfc.section.9.8.p.4">Example:</p>
    20962087      <div id="rfc.figure.u.23"></div><pre class="text">  Server: CERN/3.0 libwww/2.17
     
    21222113         doing so makes the field value more difficult to parse.
    21232114      </p>
    2124       <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.26"></span><span id="rfc.iref.g.27"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a>     = "User-Agent" ":" <a href="#core.rules" class="smpl">OWS</a> <a href="#header.user-agent" class="smpl">User-Agent-v</a>
    2125   <a href="#header.user-agent" class="smpl">User-Agent-v</a>   = <a href="#abnf.dependencies" class="smpl">product</a> *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
     2115      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.18"></span>  <a href="#header.user-agent" class="smpl">User-Agent</a> = <a href="#abnf.dependencies" class="smpl">product</a> *( <a href="#core.rules" class="smpl">RWS</a> ( <a href="#abnf.dependencies" class="smpl">product</a> / <a href="#abnf.dependencies" class="smpl">comment</a> ) )
    21262116</pre><p id="rfc.section.9.9.p.7">Example:</p>
    21272117      <div id="rfc.figure.u.25"></div><pre class="text">  User-Agent: CERN-LineMode/2.15 libwww/2.17b3
     
    27082698      <p id="rfc.section.A.p.7">Define status 426 (Upgrade Required) (this was incorporated from <a href="#RFC2817" id="rfc.xref.RFC2817.4"><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;8.4.19</a>)
    27092699      </p>
    2710       <p id="rfc.section.A.p.8">Reclassify "Allow" as response header field, removing the option to specify it in a PUT request. Relax the server requirement
     2700      <p id="rfc.section.A.p.8">Change ABNF productions for header fields to only define the field value. (<a href="#header.fields" title="Header Field Definitions">Section&nbsp;9</a>)
     2701      </p>
     2702      <p id="rfc.section.A.p.9">Reclassify "Allow" as response header field, removing the option to specify it in a PUT request. Relax the server requirement
    27112703         on the contents of the Allow header field and remove requirement on clients to always trust the header field value. (<a href="#header.allow" id="rfc.xref.header.allow.4" title="Allow">Section&nbsp;9.1</a>)
    27122704      </p>
    2713       <p id="rfc.section.A.p.9">Correct syntax of Location header field to allow URI references (including relative references and fragments), as referred
     2705      <p id="rfc.section.A.p.10">Correct syntax of Location header field to allow URI references (including relative references and fragments), as referred
    27142706         symbol "absoluteURI" wasn't what was expected, and add some clarifications as to when use of fragments would not be appropriate.
    27152707         (<a href="#header.location" id="rfc.xref.header.location.4" title="Location">Section&nbsp;9.4</a>)
    27162708      </p>
    2717       <p id="rfc.section.A.p.10">Restrict Max-Forwards header field to OPTIONS and TRACE (previously, extension methods could have used it as well). (<a href="#header.max-forwards" id="rfc.xref.header.max-forwards.5" title="Max-Forwards">Section&nbsp;9.5</a>)
    2718       </p>
    2719       <p id="rfc.section.A.p.11">Allow Referer field value of "about:blank" as alternative to not specifying it. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;9.6</a>)
    2720       </p>
    2721       <p id="rfc.section.A.p.12">In the description of the Server header field, the Via field was described as a SHOULD. The requirement was and is stated
     2709      <p id="rfc.section.A.p.11">Restrict Max-Forwards header field to OPTIONS and TRACE (previously, extension methods could have used it as well). (<a href="#header.max-forwards" id="rfc.xref.header.max-forwards.5" title="Max-Forwards">Section&nbsp;9.5</a>)
     2710      </p>
     2711      <p id="rfc.section.A.p.12">Allow Referer field value of "about:blank" as alternative to not specifying it. (<a href="#header.referer" id="rfc.xref.header.referer.3" title="Referer">Section&nbsp;9.6</a>)
     2712      </p>
     2713      <p id="rfc.section.A.p.13">In the description of the Server header field, the Via field was described as a SHOULD. The requirement was and is stated
    27222714         correctly in the description of the Via header field in <a href="p1-messaging.html#header.via" title="Via">Section 9.9</a> of <a href="#Part1" id="rfc.xref.Part1.36"><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&nbsp;9.8</a>)
    27232715      </p>
    27242716      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    2725       <div id="rfc.figure.u.26"></div> <pre class="inline"><a href="#header.allow" class="smpl">Allow</a> = "Allow:" OWS Allow-v
    2726 <a href="#header.allow" class="smpl">Allow-v</a> = [ ( "," / Method ) *( OWS "," [ OWS Method ] ) ]
     2717      <div id="rfc.figure.u.26"></div> <pre class="inline"><a href="#header.allow" class="smpl">Allow</a> = [ ( "," / Method ) *( OWS "," [ OWS Method ] ) ]
    27272718
    2728 <a href="#header.expect" class="smpl">Expect</a> = "Expect:" OWS Expect-v
    2729 <a href="#header.expect" class="smpl">Expect-v</a> = *( "," OWS ) expectation *( OWS "," [ OWS expectation ] )
     2719<a href="#header.expect" class="smpl">Expect</a> = *( "," OWS ) expectation *( OWS "," [ OWS expectation ] )
    27302720
    2731 <a href="#header.from" class="smpl">From</a> = "From:" OWS From-v
    2732 <a href="#header.from" class="smpl">From-v</a> = mailbox
     2721<a href="#header.from" class="smpl">From</a> = mailbox
    27332722
    27342723<a href="#abnf.dependencies" class="smpl">HTTP-date</a> = &lt;HTTP-date, defined in [Part1], Section 6.1&gt;
    27352724
    2736 <a href="#header.location" class="smpl">Location</a> = "Location:" OWS Location-v
    2737 <a href="#header.location" class="smpl">Location-v</a> = URI-reference
     2725<a href="#header.location" class="smpl">Location</a> = URI-reference
    27382726
    2739 <a href="#header.max-forwards" class="smpl">Max-Forwards</a> = "Max-Forwards:" OWS Max-Forwards-v
    2740 <a href="#header.max-forwards" class="smpl">Max-Forwards-v</a> = 1*DIGIT
     2727<a href="#header.max-forwards" class="smpl">Max-Forwards</a> = 1*DIGIT
    27412728<a href="#method" class="smpl">Method</a> = token
    27422729
     
    27452732<a href="#core.rules" class="smpl">RWS</a> = &lt;RWS, defined in [Part1], Section 1.2.2&gt;
    27462733<a href="#status.code.and.reason.phrase" class="smpl">Reason-Phrase</a> = *( WSP / VCHAR / obs-text )
    2747 <a href="#header.referer" class="smpl">Referer</a> = "Referer:" OWS Referer-v
    2748 <a href="#header.referer" class="smpl">Referer-v</a> = absolute-URI / partial-URI
    2749 <a href="#header.retry-after" class="smpl">Retry-After</a> = "Retry-After:" OWS Retry-After-v
    2750 <a href="#header.retry-after" class="smpl">Retry-After-v</a> = HTTP-date / delta-seconds
     2734<a href="#header.referer" class="smpl">Referer</a> = absolute-URI / partial-URI
     2735<a href="#header.retry-after" class="smpl">Retry-After</a> = HTTP-date / delta-seconds
    27512736
    2752 <a href="#header.server" class="smpl">Server</a> = "Server:" OWS Server-v
    2753 <a href="#header.server" class="smpl">Server-v</a> = product *( RWS ( product / comment ) )
     2737<a href="#header.server" class="smpl">Server</a> = product *( RWS ( product / comment ) )
    27542738<a href="#status.code.and.reason.phrase" class="smpl">Status-Code</a> = 3DIGIT
    27552739
    27562740<a href="#abnf.dependencies" class="smpl">URI-reference</a> = &lt;URI-reference, defined in [Part1], Section 2.6&gt;
    2757 <a href="#header.user-agent" class="smpl">User-Agent</a> = "User-Agent:" OWS User-Agent-v
    2758 <a href="#header.user-agent" class="smpl">User-Agent-v</a> = product *( RWS ( product / comment ) )
     2741<a href="#header.user-agent" class="smpl">User-Agent</a> = product *( RWS ( product / comment ) )
    27592742
    27602743<a href="#abnf.dependencies" class="smpl">absolute-URI</a> = &lt;absolute-URI, defined in [Part1], Section 2.6&gt;
     
    30313014      </ul>
    30323015      <h2 id="rfc.section.C.15"><a href="#rfc.section.C.15">C.15</a>&nbsp;<a id="changes.since.13" href="#changes.since.13">Since draft-ietf-httpbis-p2-semantics-13</a></h2>
    3033       <p id="rfc.section.C.15.p.1">None yet.</p>
     3016      <p id="rfc.section.C.15.p.1">Closed issues: </p>
     3017      <ul>
     3018         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/276">http://tools.ietf.org/wg/httpbis/trac/ticket/276</a>&gt;: "untangle ABNFs for header fields"
     3019         </li>
     3020      </ul>
    30343021      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    30353022      <p class="noprint"><a href="#rfc.index.1">1</a> <a href="#rfc.index.2">2</a> <a href="#rfc.index.3">3</a> <a href="#rfc.index.4">4</a> <a href="#rfc.index.5">5</a> <a href="#rfc.index.A">A</a> <a href="#rfc.index.C">C</a> <a href="#rfc.index.D">D</a> <a href="#rfc.index.E">E</a> <a href="#rfc.index.F">F</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.M">M</a> <a href="#rfc.index.O">O</a> <a href="#rfc.index.P">P</a> <a href="#rfc.index.R">R</a> <a href="#rfc.index.S">S</a> <a href="#rfc.index.T">T</a> <a href="#rfc.index.U">U</a>
     
    31193106                     <ul>
    31203107                        <li><tt>Allow</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>9.1</b></a></li>
    3121                         <li><tt>Allow-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>9.1</b></a></li>
    3122                         <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.23"><b>9.7</b></a></li>
    3123                         <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>9.2</b></a></li>
    3124                         <li><tt>expect-params</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>9.2</b></a></li>
    3125                         <li><tt>Expect-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>9.2</b></a></li>
    3126                         <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>9.2</b></a></li>
    3127                         <li><tt>expectation-extension</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>9.2</b></a></li>
     3108                        <li><tt>delta-seconds</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>9.7</b></a></li>
     3109                        <li><tt>Expect</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>9.2</b></a></li>
     3110                        <li><tt>expect-params</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>9.2</b></a></li>
     3111                        <li><tt>expectation</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.8"><b>9.2</b></a></li>
     3112                        <li><tt>expectation-extension</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>9.2</b></a></li>
    31283113                        <li><tt>extension-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.3"><b>4</b></a></li>
    3129                         <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>9.3</b></a></li>
    3130                         <li><tt>From-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>9.3</b></a></li>
    3131                         <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>9.4</b></a></li>
    3132                         <li><tt>Location-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.16"><b>9.4</b></a></li>
    3133                         <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>9.5</b></a></li>
    3134                         <li><tt>Max-Forwards-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>9.5</b></a></li>
     3114                        <li><tt>From</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>9.3</b></a></li>
     3115                        <li><tt>Location</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>9.4</b></a></li>
     3116                        <li><tt>Max-Forwards</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>9.5</b></a></li>
    31353117                        <li><tt>Method</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.1"><b>2</b></a></li>
    31363118                        <li><tt>Reason-Phrase</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.4"><b>4</b></a></li>
    3137                         <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.19"><b>9.6</b></a></li>
    3138                         <li><tt>Referer-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.20"><b>9.6</b></a></li>
    3139                         <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.21"><b>9.7</b></a></li>
    3140                         <li><tt>Retry-After-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.22"><b>9.7</b></a></li>
    3141                         <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.24"><b>9.8</b></a></li>
    3142                         <li><tt>Server-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.25"><b>9.8</b></a></li>
     3119                        <li><tt>Referer</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>9.6</b></a></li>
     3120                        <li><tt>Retry-After</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>9.7</b></a></li>
     3121                        <li><tt>Server</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.17"><b>9.8</b></a></li>
    31433122                        <li><tt>Status-Code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.2"><b>4</b></a></li>
    3144                         <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.26"><b>9.9</b></a></li>
    3145                         <li><tt>User-Agent-v</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.27"><b>9.9</b></a></li>
     3123                        <li><tt>User-Agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.18"><b>9.9</b></a></li>
    31463124                     </ul>
    31473125                  </li>
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