Ignore:
Timestamp:
Sep 3, 2012, 4:03:33 PM (7 years ago)
Author:
fielding@…
Message:

(editorial) move Vary to p2 because it is generated by origin servers and not limited to caching

File:
1 edited

Legend:

Unmodified
Added
Removed

  • draft-ietf-httpbis/latest/p6-cache.html

    r1858 r1860  
    650650               <li><a href="#rfc.section.7.3">7.3</a>&nbsp;&nbsp;&nbsp;<a href="#header.expires">Expires</a></li>
    651651               <li><a href="#rfc.section.7.4">7.4</a>&nbsp;&nbsp;&nbsp;<a href="#header.pragma">Pragma</a></li>
    652                <li><a href="#rfc.section.7.5">7.5</a>&nbsp;&nbsp;&nbsp;<a href="#header.vary">Vary</a></li>
    653                <li><a href="#rfc.section.7.6">7.6</a>&nbsp;&nbsp;&nbsp;<a href="#header.warning">Warning</a><ul>
    654                      <li><a href="#rfc.section.7.6.1">7.6.1</a>&nbsp;&nbsp;&nbsp;<a href="#warn.110">110 Response is Stale</a></li>
    655                      <li><a href="#rfc.section.7.6.2">7.6.2</a>&nbsp;&nbsp;&nbsp;<a href="#warn.111">111 Revalidation Failed</a></li>
    656                      <li><a href="#rfc.section.7.6.3">7.6.3</a>&nbsp;&nbsp;&nbsp;<a href="#warn.112">112 Disconnected Operation</a></li>
    657                      <li><a href="#rfc.section.7.6.4">7.6.4</a>&nbsp;&nbsp;&nbsp;<a href="#warn.113">113 Heuristic Expiration</a></li>
    658                      <li><a href="#rfc.section.7.6.5">7.6.5</a>&nbsp;&nbsp;&nbsp;<a href="#warn.199">199 Miscellaneous Warning</a></li>
    659                      <li><a href="#rfc.section.7.6.6">7.6.6</a>&nbsp;&nbsp;&nbsp;<a href="#warn.214">214 Transformation Applied</a></li>
    660                      <li><a href="#rfc.section.7.6.7">7.6.7</a>&nbsp;&nbsp;&nbsp;<a href="#warn.299">299 Miscellaneous Persistent Warning</a></li>
    661                      <li><a href="#rfc.section.7.6.8">7.6.8</a>&nbsp;&nbsp;&nbsp;<a href="#warn.code.extensions">Warn Code Extensions</a></li>
     652               <li><a href="#rfc.section.7.5">7.5</a>&nbsp;&nbsp;&nbsp;<a href="#header.warning">Warning</a><ul>
     653                     <li><a href="#rfc.section.7.5.1">7.5.1</a>&nbsp;&nbsp;&nbsp;<a href="#warn.110">110 Response is Stale</a></li>
     654                     <li><a href="#rfc.section.7.5.2">7.5.2</a>&nbsp;&nbsp;&nbsp;<a href="#warn.111">111 Revalidation Failed</a></li>
     655                     <li><a href="#rfc.section.7.5.3">7.5.3</a>&nbsp;&nbsp;&nbsp;<a href="#warn.112">112 Disconnected Operation</a></li>
     656                     <li><a href="#rfc.section.7.5.4">7.5.4</a>&nbsp;&nbsp;&nbsp;<a href="#warn.113">113 Heuristic Expiration</a></li>
     657                     <li><a href="#rfc.section.7.5.5">7.5.5</a>&nbsp;&nbsp;&nbsp;<a href="#warn.199">199 Miscellaneous Warning</a></li>
     658                     <li><a href="#rfc.section.7.5.6">7.5.6</a>&nbsp;&nbsp;&nbsp;<a href="#warn.214">214 Transformation Applied</a></li>
     659                     <li><a href="#rfc.section.7.5.7">7.5.7</a>&nbsp;&nbsp;&nbsp;<a href="#warn.299">299 Miscellaneous Persistent Warning</a></li>
     660                     <li><a href="#rfc.section.7.5.8">7.5.8</a>&nbsp;&nbsp;&nbsp;<a href="#warn.code.extensions">Warn Code Extensions</a></li>
    662661                  </ul>
    663662               </li>
    … …  
    10661065         or doing so is explicitly allowed (e.g., by the max-stale request directive; see <a href="#cache-request-directive" title="Request Cache-Control Directives">Section&nbsp;7.2.1</a>).
    10671066      </p>
    1068       <p id="rfc.section.4.1.4.p.4">A cache <em class="bcp14">SHOULD</em> append a <a href="#header.warning" class="smpl">Warning</a> header field with the 110 warn-code (see <a href="#header.warning" id="rfc.xref.header.warning.1" title="Warning">Section&nbsp;7.6</a>) to stale responses. Likewise, a cache <em class="bcp14">SHOULD</em> add the 112 warn-code to stale responses if the cache is disconnected.
     1067      <p id="rfc.section.4.1.4.p.4">A cache <em class="bcp14">SHOULD</em> append a <a href="#header.warning" class="smpl">Warning</a> header field with the 110 warn-code (see <a href="#header.warning" id="rfc.xref.header.warning.1" title="Warning">Section&nbsp;7.5</a>) to stale responses. Likewise, a cache <em class="bcp14">SHOULD</em> add the 112 warn-code to stale responses if the cache is disconnected.
    10691068      </p>
    10701069      <p id="rfc.section.4.1.4.p.5">If a cache receives a first-hand response (either an entire response, or a <a href="p4-conditional.html#status.304" class="smpl">304 (Not Modified)</a> response) that it would normally forward to the requesting client, and the received response is no longer fresh, the cache
    … …  
    11141113      </p>
    11151114      <ul>
    1116          <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.2" title="Warning">Section&nbsp;7.6</a>);
     1115         <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.2" title="Warning">Section&nbsp;7.5</a>);
    11171116         </li>
    11181117         <li>retain any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 2xx; and,
    … …  
    11221121      </ul>
    11231122      <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="caching.negotiated.responses" href="#caching.negotiated.responses">Using Negotiated Responses</a></h2>
    1124       <p id="rfc.section.4.3.p.1">When a cache receives a request that can be satisfied by a stored response that has a <a href="#header.vary" class="smpl">Vary</a> header field (<a href="#header.vary" id="rfc.xref.header.vary.1" title="Vary">Section&nbsp;7.5</a>), it <em class="bcp14">MUST NOT</em> use that response unless all of the selecting header fields nominated by the Vary header field match in both the original
     1123      <p id="rfc.section.4.3.p.1">When a cache receives a request that can be satisfied by a stored response that has a <a href="p2-semantics.html#header.vary" class="smpl">Vary</a> header field (<a href="p2-semantics.html#header.vary" title="Vary">Section 8.2.2</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>), it <em class="bcp14">MUST NOT</em> use that response unless all of the selecting header fields nominated by the Vary header field match in both the original
    11251124         request (i.e., that associated with the stored response), and the presented request.
    11261125      </p>
    … …  
    11391138         if it is also absent there.
    11401139      </p>
    1141       <p id="rfc.section.4.3.p.4">A <a href="#header.vary" class="smpl">Vary</a> header field-value of "*" always fails to match, and subsequent requests to that resource can only be properly interpreted
     1140      <p id="rfc.section.4.3.p.4">A <a href="p2-semantics.html#header.vary" class="smpl">Vary</a> header field-value of "*" always fails to match, and subsequent requests to that resource can only be properly interpreted
    11421141         by the origin server.
    11431142      </p>
    … …  
    11561155      </p>
    11571156      <ul>
    1158          <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.3" title="Warning">Section&nbsp;7.6</a>);
     1157         <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.3" title="Warning">Section&nbsp;7.5</a>);
    11591158         </li>
    11601159         <li>retain any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 2xx; and,
    … …  
    11721171      </p>
    11731172      <ul>
    1174          <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.4" title="Warning">Section&nbsp;7.6</a>);
     1173         <li>delete any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 1xx (see <a href="#header.warning" id="rfc.xref.header.warning.4" title="Warning">Section&nbsp;7.5</a>);
    11751174         </li>
    11761175         <li>retain any <a href="#header.warning" class="smpl">Warning</a> header fields in the stored response with warn-code 2xx; and,
    … …  
    11811180      </ul>
    11821181      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="invalidation.after.updates.or.deletions" href="#invalidation.after.updates.or.deletions">Request Methods that Invalidate</a></h1>
    1183       <p id="rfc.section.6.p.1">Because unsafe request methods (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 5.2.1</a> of <a href="#Part2" id="rfc.xref.Part2.5"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>) such as PUT, POST or DELETE have the potential for changing state on the origin server, intervening caches can use them
     1182      <p id="rfc.section.6.p.1">Because unsafe request methods (<a href="p2-semantics.html#safe.methods" title="Safe Methods">Section 5.2.1</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>) such as PUT, POST or DELETE have the potential for changing state on the origin server, intervening caches can use them
    11841183         to keep their contents up-to-date.
    11851184      </p>
    … …  
    14681467         that time.
    14691468      </p>
    1470       <p id="rfc.section.7.3.p.3">The field-value is an absolute date and time as defined by HTTP-date in <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 9.1</a> of <a href="#Part2" id="rfc.xref.Part2.6"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>; a sender <em class="bcp14">MUST</em> use the rfc1123-date format.
     1469      <p id="rfc.section.7.3.p.3">The field-value is an absolute date and time as defined by HTTP-date in <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 9.1</a> of <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>; a sender <em class="bcp14">MUST</em> use the rfc1123-date format.
    14711470      </p>
    14721471      <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.5"></span>  <a href="#header.expires" class="smpl">Expires</a> = <a href="#imported.abnf" class="smpl">HTTP-date</a>
    … …  
    15191518         </p>
    15201519      </div>
    1521       <div id="rfc.iref.v.3"></div>
     1520      <div id="rfc.iref.w.1"></div>
    15221521      <div id="rfc.iref.h.6"></div>
    1523       <h2 id="rfc.section.7.5"><a href="#rfc.section.7.5">7.5</a>&nbsp;<a id="header.vary" href="#header.vary">Vary</a></h2>
    1524       <p id="rfc.section.7.5.p.1">The "Vary" header field conveys the set of header fields that were used to select the representation.</p>
    1525       <p id="rfc.section.7.5.p.2">Caches use this information, in part, to determine whether a stored response can be used to satisfy a given request; see <a href="#caching.negotiated.responses" title="Using Negotiated Responses">Section&nbsp;4.3</a>.
    1526       </p>
    1527       <p id="rfc.section.7.5.p.3">In uncacheable or stale responses, the Vary field value advises the user agent about the criteria that were used to select
    1528          the representation.
    1529       </p>
    1530       <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.9"></span>  <a href="#header.vary" class="smpl">Vary</a> = "*" / 1#<a href="#imported.abnf" class="smpl">field-name</a>
    1531 </pre><p id="rfc.section.7.5.p.5">The set of header fields named by the Vary field value is known as the selecting header fields.</p>
    1532       <p id="rfc.section.7.5.p.6">A server <em class="bcp14">SHOULD</em> include a Vary header field with any cacheable response that is subject to proactive negotiation. Doing so allows a cache
    1533          to properly interpret future requests on that resource and informs the user agent about the presence of negotiation on that
    1534          resource. A server <em class="bcp14">MAY</em> include a Vary header field with a non-cacheable response that is subject to proactive negotiation, since this might provide
    1535          the user agent with useful information about the dimensions over which the response varies at the time of the response.
    1536       </p>
    1537       <p id="rfc.section.7.5.p.7">A Vary field value of "*" signals that unspecified parameters not limited to the header fields (e.g., the network address
    1538          of the client), play a role in the selection of the response representation; therefore, a cache cannot determine whether this
    1539          response is appropriate. A proxy <em class="bcp14">MUST NOT</em> generate the "*" value.
    1540       </p>
    1541       <p id="rfc.section.7.5.p.8">The field-names given are not limited to the set of standard header fields defined by this specification. Field names are
    1542          case-insensitive.
    1543       </p>
    1544       <div id="rfc.iref.w.1"></div>
    1545       <div id="rfc.iref.h.7"></div>
    1546       <h2 id="rfc.section.7.6"><a href="#rfc.section.7.6">7.6</a>&nbsp;<a id="header.warning" href="#header.warning">Warning</a></h2>
    1547       <p id="rfc.section.7.6.p.1">The "Warning" header field is used to carry additional information about the status or transformation of a message that might
     1522      <h2 id="rfc.section.7.5"><a href="#rfc.section.7.5">7.5</a>&nbsp;<a id="header.warning" href="#header.warning">Warning</a></h2>
     1523      <p id="rfc.section.7.5.p.1">The "Warning" header field is used to carry additional information about the status or transformation of a message that might
    15481524         not be reflected in the message. This information is typically used to warn about possible incorrectness introduced by caching
    15491525         operations or transformations applied to the payload of the message.
    15501526      </p>
    1551       <p id="rfc.section.7.6.p.2">Warnings can be used for other purposes, both cache-related and otherwise. The use of a warning, rather than an error status
     1527      <p id="rfc.section.7.5.p.2">Warnings can be used for other purposes, both cache-related and otherwise. The use of a warning, rather than an error status
    15521528         code, distinguishes these responses from true failures.
    15531529      </p>
    1554       <p id="rfc.section.7.6.p.3">Warning header fields can in general be applied to any message, however some warn-codes are specific to caches and can only
     1530      <p id="rfc.section.7.5.p.3">Warning header fields can in general be applied to any message, however some warn-codes are specific to caches and can only
    15551531         be applied to response messages.
    15561532      </p>
    1557       <div id="rfc.figure.u.14"></div><pre class="inline"><span id="rfc.iref.g.10"></span><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  <a href="#header.warning" class="smpl">Warning</a>       = 1#<a href="#header.warning" class="smpl">warning-value</a>
     1533      <div id="rfc.figure.u.13"></div><pre class="inline"><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><span id="rfc.iref.g.13"></span><span id="rfc.iref.g.14"></span>  <a href="#header.warning" class="smpl">Warning</a>       = 1#<a href="#header.warning" class="smpl">warning-value</a>
    15581534 
    15591535  <a href="#header.warning" class="smpl">warning-value</a> = <a href="#header.warning" class="smpl">warn-code</a> <a href="#imported.abnf" class="smpl">SP</a> <a href="#header.warning" class="smpl">warn-agent</a> <a href="#imported.abnf" class="smpl">SP</a> <a href="#header.warning" class="smpl">warn-text</a>
    … …  
    15661542  <a href="#header.warning" class="smpl">warn-text</a>  = <a href="#imported.abnf" class="smpl">quoted-string</a>
    15671543  <a href="#header.warning" class="smpl">warn-date</a>  = <a href="#imported.abnf" class="smpl">DQUOTE</a> <a href="#imported.abnf" class="smpl">HTTP-date</a> <a href="#imported.abnf" class="smpl">DQUOTE</a>
    1568 </pre><p id="rfc.section.7.6.p.5">Multiple warnings can be attached to a response (either by the origin server or by a cache), including multiple warnings with
     1544</pre><p id="rfc.section.7.5.p.5">Multiple warnings can be attached to a response (either by the origin server or by a cache), including multiple warnings with
    15691545         the same code number, only differing in warn-text.
    15701546      </p>
    1571       <p id="rfc.section.7.6.p.6">When this occurs, the user agent <em class="bcp14">SHOULD</em> inform the user of as many of them as possible, in the order that they appear in the response.
    1572       </p>
    1573       <p id="rfc.section.7.6.p.7">Systems that generate multiple Warning header fields are encouraged to order them with this user agent behavior in mind. New
     1547      <p id="rfc.section.7.5.p.6">When this occurs, the user agent <em class="bcp14">SHOULD</em> inform the user of as many of them as possible, in the order that they appear in the response.
     1548      </p>
     1549      <p id="rfc.section.7.5.p.7">Systems that generate multiple Warning header fields are encouraged to order them with this user agent behavior in mind. New
    15741550         Warning header fields are added after any existing Warning header fields.
    15751551      </p>
    1576       <p id="rfc.section.7.6.p.8">Warnings are assigned three digit warn-codes. The first digit indicates whether the Warning is required to be deleted from
     1552      <p id="rfc.section.7.5.p.8">Warnings are assigned three digit warn-codes. The first digit indicates whether the Warning is required to be deleted from
    15771553         a stored response after validation:
    15781554      </p>
    … …  
    15841560         </li>
    15851561      </ul>
    1586       <p id="rfc.section.7.6.p.9">If an implementation sends a message with one or more Warning header fields to a receiver whose version is HTTP/1.0 or lower,
     1562      <p id="rfc.section.7.5.p.9">If an implementation sends a message with one or more Warning header fields to a receiver whose version is HTTP/1.0 or lower,
    15871563         then the sender <em class="bcp14">MUST</em> include in each warning-value a warn-date that matches the <a href="p2-semantics.html#header.date" class="smpl">Date</a> header field in the message.
    15881564      </p>
    1589       <p id="rfc.section.7.6.p.10">If a system receives a message with a warning-value that includes a warn-date, and that warn-date is different from the <a href="p2-semantics.html#header.date" class="smpl">Date</a> value in the response, then that warning-value <em class="bcp14">MUST</em> be deleted from the message before storing, forwarding, or using it. (preventing the consequences of naive caching of Warning
     1565      <p id="rfc.section.7.5.p.10">If a system receives a message with a warning-value that includes a warn-date, and that warn-date is different from the <a href="p2-semantics.html#header.date" class="smpl">Date</a> value in the response, then that warning-value <em class="bcp14">MUST</em> be deleted from the message before storing, forwarding, or using it. (preventing the consequences of naive caching of Warning
    15901566         header fields.) If all of the warning-values are deleted for this reason, the Warning header field <em class="bcp14">MUST</em> be deleted as well.
    15911567      </p>
    1592       <p id="rfc.section.7.6.p.11">The following warn-codes are defined by this specification, each with a recommended warn-text in English, and a description
     1568      <p id="rfc.section.7.5.p.11">The following warn-codes are defined by this specification, each with a recommended warn-text in English, and a description
    15931569         of its meaning.
    15941570      </p>
     1571      <div id="rfc.iref.73"></div>
     1572      <div id="rfc.iref.w.2"></div>
     1573      <h3 id="rfc.section.7.5.1"><a href="#rfc.section.7.5.1">7.5.1</a>&nbsp;<a id="warn.110" href="#warn.110">110 Response is Stale</a></h3>
     1574      <p id="rfc.section.7.5.1.p.1">A cache <em class="bcp14">SHOULD</em> include this whenever the returned response is stale.
     1575      </p>
     1576      <div id="rfc.iref.74"></div>
     1577      <div id="rfc.iref.w.3"></div>
     1578      <h3 id="rfc.section.7.5.2"><a href="#rfc.section.7.5.2">7.5.2</a>&nbsp;<a id="warn.111" href="#warn.111">111 Revalidation Failed</a></h3>
     1579      <p id="rfc.section.7.5.2.p.1">A cache <em class="bcp14">SHOULD</em> include this when returning a stale response because an attempt to validate the response failed, due to an inability to reach
     1580         the server.
     1581      </p>
     1582      <div id="rfc.iref.75"></div>
     1583      <div id="rfc.iref.w.4"></div>
     1584      <h3 id="rfc.section.7.5.3"><a href="#rfc.section.7.5.3">7.5.3</a>&nbsp;<a id="warn.112" href="#warn.112">112 Disconnected Operation</a></h3>
     1585      <p id="rfc.section.7.5.3.p.1">A cache <em class="bcp14">SHOULD</em> include this if it is intentionally disconnected from the rest of the network for a period of time.
     1586      </p>
    15951587      <div id="rfc.iref.76"></div>
    1596       <div id="rfc.iref.w.2"></div>
    1597       <h3 id="rfc.section.7.6.1"><a href="#rfc.section.7.6.1">7.6.1</a>&nbsp;<a id="warn.110" href="#warn.110">110 Response is Stale</a></h3>
    1598       <p id="rfc.section.7.6.1.p.1">A cache <em class="bcp14">SHOULD</em> include this whenever the returned response is stale.
     1588      <div id="rfc.iref.w.5"></div>
     1589      <h3 id="rfc.section.7.5.4"><a href="#rfc.section.7.5.4">7.5.4</a>&nbsp;<a id="warn.113" href="#warn.113">113 Heuristic Expiration</a></h3>
     1590      <p id="rfc.section.7.5.4.p.1">A cache <em class="bcp14">SHOULD</em> include this if it heuristically chose a freshness lifetime greater than 24 hours and the response's age is greater than 24
     1591         hours.
    15991592      </p>
    16001593      <div id="rfc.iref.77"></div>
    1601       <div id="rfc.iref.w.3"></div>
    1602       <h3 id="rfc.section.7.6.2"><a href="#rfc.section.7.6.2">7.6.2</a>&nbsp;<a id="warn.111" href="#warn.111">111 Revalidation Failed</a></h3>
    1603       <p id="rfc.section.7.6.2.p.1">A cache <em class="bcp14">SHOULD</em> include this when returning a stale response because an attempt to validate the response failed, due to an inability to reach
    1604          the server.
     1594      <div id="rfc.iref.w.6"></div>
     1595      <h3 id="rfc.section.7.5.5"><a href="#rfc.section.7.5.5">7.5.5</a>&nbsp;<a id="warn.199" href="#warn.199">199 Miscellaneous Warning</a></h3>
     1596      <p id="rfc.section.7.5.5.p.1">The warning text can include arbitrary information to be presented to a human user, or logged. A system receiving this warning <em class="bcp14">MUST NOT</em> take any automated action, besides presenting the warning to the user.
    16051597      </p>
    16061598      <div id="rfc.iref.78"></div>
    1607       <div id="rfc.iref.w.4"></div>
    1608       <h3 id="rfc.section.7.6.3"><a href="#rfc.section.7.6.3">7.6.3</a>&nbsp;<a id="warn.112" href="#warn.112">112 Disconnected Operation</a></h3>
    1609       <p id="rfc.section.7.6.3.p.1">A cache <em class="bcp14">SHOULD</em> include this if it is intentionally disconnected from the rest of the network for a period of time.
     1599      <div id="rfc.iref.w.7"></div>
     1600      <h3 id="rfc.section.7.5.6"><a href="#rfc.section.7.5.6">7.5.6</a>&nbsp;<a id="warn.214" href="#warn.214">214 Transformation Applied</a></h3>
     1601      <p id="rfc.section.7.5.6.p.1"> <em class="bcp14">MUST</em> be added by a proxy if it applies any transformation to the representation, such as changing the content-coding, media-type,
     1602         or modifying the representation data, unless this Warning code already appears in the response.
    16101603      </p>
    16111604      <div id="rfc.iref.79"></div>
    1612       <div id="rfc.iref.w.5"></div>
    1613       <h3 id="rfc.section.7.6.4"><a href="#rfc.section.7.6.4">7.6.4</a>&nbsp;<a id="warn.113" href="#warn.113">113 Heuristic Expiration</a></h3>
    1614       <p id="rfc.section.7.6.4.p.1">A cache <em class="bcp14">SHOULD</em> include this if it heuristically chose a freshness lifetime greater than 24 hours and the response's age is greater than 24
    1615          hours.
    1616       </p>
    1617       <div id="rfc.iref.80"></div>
    1618       <div id="rfc.iref.w.6"></div>
    1619       <h3 id="rfc.section.7.6.5"><a href="#rfc.section.7.6.5">7.6.5</a>&nbsp;<a id="warn.199" href="#warn.199">199 Miscellaneous Warning</a></h3>
    1620       <p id="rfc.section.7.6.5.p.1">The warning text can include arbitrary information to be presented to a human user, or logged. A system receiving this warning <em class="bcp14">MUST NOT</em> take any automated action, besides presenting the warning to the user.
    1621       </p>
    1622       <div id="rfc.iref.81"></div>
    1623       <div id="rfc.iref.w.7"></div>
    1624       <h3 id="rfc.section.7.6.6"><a href="#rfc.section.7.6.6">7.6.6</a>&nbsp;<a id="warn.214" href="#warn.214">214 Transformation Applied</a></h3>
    1625       <p id="rfc.section.7.6.6.p.1"> <em class="bcp14">MUST</em> be added by a proxy if it applies any transformation to the representation, such as changing the content-coding, media-type,
    1626          or modifying the representation data, unless this Warning code already appears in the response.
    1627       </p>
    1628       <div id="rfc.iref.82"></div>
    16291605      <div id="rfc.iref.w.8"></div>
    1630       <h3 id="rfc.section.7.6.7"><a href="#rfc.section.7.6.7">7.6.7</a>&nbsp;<a id="warn.299" href="#warn.299">299 Miscellaneous Persistent Warning</a></h3>
    1631       <p id="rfc.section.7.6.7.p.1">The warning text can include arbitrary information to be presented to a human user, or logged. A system receiving this warning <em class="bcp14">MUST NOT</em> take any automated action.
    1632       </p>
    1633       <h3 id="rfc.section.7.6.8"><a href="#rfc.section.7.6.8">7.6.8</a>&nbsp;<a id="warn.code.extensions" href="#warn.code.extensions">Warn Code Extensions</a></h3>
    1634       <p id="rfc.section.7.6.8.p.1">The HTTP Warn Code Registry defines the name space for warn codes.</p>
    1635       <p id="rfc.section.7.6.8.p.2">A registration <em class="bcp14">MUST</em> include the following fields:
     1606      <h3 id="rfc.section.7.5.7"><a href="#rfc.section.7.5.7">7.5.7</a>&nbsp;<a id="warn.299" href="#warn.299">299 Miscellaneous Persistent Warning</a></h3>
     1607      <p id="rfc.section.7.5.7.p.1">The warning text can include arbitrary information to be presented to a human user, or logged. A system receiving this warning <em class="bcp14">MUST NOT</em> take any automated action.
     1608      </p>
     1609      <h3 id="rfc.section.7.5.8"><a href="#rfc.section.7.5.8">7.5.8</a>&nbsp;<a id="warn.code.extensions" href="#warn.code.extensions">Warn Code Extensions</a></h3>
     1610      <p id="rfc.section.7.5.8.p.1">The HTTP Warn Code Registry defines the name space for warn codes.</p>
     1611      <p id="rfc.section.7.5.8.p.2">A registration <em class="bcp14">MUST</em> include the following fields:
    16361612      </p>
    16371613      <ul>
    … …  
    16401616         <li>Pointer to specification text</li>
    16411617      </ul>
    1642       <p id="rfc.section.7.6.8.p.3">Values to be added to this name space require IETF Review (see <a href="#RFC5226" id="rfc.xref.RFC5226.2"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>).
    1643       </p>
    1644       <p id="rfc.section.7.6.8.p.4">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-warn-codes">http://www.iana.org/assignments/http-warn-codes</a>&gt;.
     1618      <p id="rfc.section.7.5.8.p.3">Values to be added to this name space require IETF Review (see <a href="#RFC5226" id="rfc.xref.RFC5226.2"><cite title="Guidelines for Writing an IANA Considerations Section in RFCs">[RFC5226]</cite></a>, <a href="http://tools.ietf.org/html/rfc5226#section-4.1">Section 4.1</a>).
     1619      </p>
     1620      <p id="rfc.section.7.5.8.p.4">The registry itself is maintained at &lt;<a href="http://www.iana.org/assignments/http-warn-codes">http://www.iana.org/assignments/http-warn-codes</a>&gt;.
    16451621      </p>
    16461622      <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="history.lists" href="#history.lists">History Lists</a></h1>
    … …  
    17441720      </div>
    17451721      <h2 id="rfc.section.9.2"><a href="#rfc.section.9.2">9.2</a>&nbsp;<a id="warn.code.registration" href="#warn.code.registration">Warn Code Registry</a></h2>
    1746       <p id="rfc.section.9.2.p.1">The registration procedure for HTTP Warn Codes is defined by <a href="#warn.code.extensions" title="Warn Code Extensions">Section&nbsp;7.6.8</a> of this document.
     1722      <p id="rfc.section.9.2.p.1">The registration procedure for HTTP Warn Codes is defined by <a href="#warn.code.extensions" title="Warn Code Extensions">Section&nbsp;7.5.8</a> of this document.
    17471723      </p>
    17481724      <p id="rfc.section.9.2.p.2">The HTTP Warn Code Registry shall be created at &lt;<a href="http://www.iana.org/assignments/http-cache-directives">http://www.iana.org/assignments/http-cache-directives</a>&gt; and be populated with the registrations below:
    … …  
    17621738                  <td class="left">110</td>
    17631739                  <td class="left">Response is Stale</td>
    1764                   <td class="left"> <a href="#warn.110" id="rfc.xref.warn.110.1" title="110 Response is Stale">Section&nbsp;7.6.1</a>
     1740                  <td class="left"> <a href="#warn.110" id="rfc.xref.warn.110.1" title="110 Response is Stale">Section&nbsp;7.5.1</a>
    17651741                  </td>
    17661742               </tr>
    … …  
    17681744                  <td class="left">111</td>
    17691745                  <td class="left">Revalidation Failed</td>
    1770                   <td class="left"> <a href="#warn.111" id="rfc.xref.warn.111.1" title="111 Revalidation Failed">Section&nbsp;7.6.2</a>
     1746                  <td class="left"> <a href="#warn.111" id="rfc.xref.warn.111.1" title="111 Revalidation Failed">Section&nbsp;7.5.2</a>
    17711747                  </td>
    17721748               </tr>
    … …  
    17741750                  <td class="left">112</td>
    17751751                  <td class="left">Disconnected Operation</td>
    1776                   <td class="left"> <a href="#warn.112" id="rfc.xref.warn.112.1" title="112 Disconnected Operation">Section&nbsp;7.6.3</a>
     1752                  <td class="left"> <a href="#warn.112" id="rfc.xref.warn.112.1" title="112 Disconnected Operation">Section&nbsp;7.5.3</a>
    17771753                  </td>
    17781754               </tr>
    … …  
    17801756                  <td class="left">113</td>
    17811757                  <td class="left">Heuristic Expiration</td>
    1782                   <td class="left"> <a href="#warn.113" id="rfc.xref.warn.113.1" title="113 Heuristic Expiration">Section&nbsp;7.6.4</a>
     1758                  <td class="left"> <a href="#warn.113" id="rfc.xref.warn.113.1" title="113 Heuristic Expiration">Section&nbsp;7.5.4</a>
    17831759                  </td>
    17841760               </tr>
    … …  
    17861762                  <td class="left">199</td>
    17871763                  <td class="left">Miscellaneous Warning</td>
    1788                   <td class="left"> <a href="#warn.199" id="rfc.xref.warn.199.1" title="199 Miscellaneous Warning">Section&nbsp;7.6.5</a>
     1764                  <td class="left"> <a href="#warn.199" id="rfc.xref.warn.199.1" title="199 Miscellaneous Warning">Section&nbsp;7.5.5</a>
    17891765                  </td>
    17901766               </tr>
    … …  
    17921768                  <td class="left">214</td>
    17931769                  <td class="left">Transformation Applied</td>
    1794                   <td class="left"> <a href="#warn.214" id="rfc.xref.warn.214.1" title="214 Transformation Applied">Section&nbsp;7.6.6</a>
     1770                  <td class="left"> <a href="#warn.214" id="rfc.xref.warn.214.1" title="214 Transformation Applied">Section&nbsp;7.5.6</a>
    17951771                  </td>
    17961772               </tr>
    … …  
    17981774                  <td class="left">299</td>
    17991775                  <td class="left">Miscellaneous Persistent Warning</td>
    1800                   <td class="left"> <a href="#warn.299" id="rfc.xref.warn.299.1" title="299 Miscellaneous Persistent Warning">Section&nbsp;7.6.7</a>
     1776                  <td class="left"> <a href="#warn.299" id="rfc.xref.warn.299.1" title="299 Miscellaneous Persistent Warning">Section&nbsp;7.5.7</a>
    18011777                  </td>
    18021778               </tr>
    … …  
    18481824               </tr>
    18491825               <tr>
    1850                   <td class="left">Vary</td>
    1851                   <td class="left">http</td>
    1852                   <td class="left">standard</td>
    1853                   <td class="left"> <a href="#header.vary" id="rfc.xref.header.vary.2" title="Vary">Section&nbsp;7.5</a>
    1854                   </td>
    1855                </tr>
    1856                <tr>
    18571826                  <td class="left">Warning</td>
    18581827                  <td class="left">http</td>
    18591828                  <td class="left">standard</td>
    1860                   <td class="left"> <a href="#header.warning" id="rfc.xref.header.warning.5" title="Warning">Section&nbsp;7.6</a>
     1829                  <td class="left"> <a href="#header.warning" id="rfc.xref.header.warning.5" title="Warning">Section&nbsp;7.5</a>
    18611830                  </td>
    18621831               </tr>
    … …  
    19681937      <p id="rfc.section.A.p.4">Change ABNF productions for header fields to only define the field value. (<a href="#header.field.definitions" title="Header Field Definitions">Section&nbsp;7</a>)
    19691938      </p>
    1970       <p id="rfc.section.A.p.5">Do not mention RFC 2047 encoding and multiple languages in <a href="#header.warning" class="smpl">Warning</a> header fields anymore, as these aspects never were implemented. (<a href="#header.warning" id="rfc.xref.header.warning.6" title="Warning">Section&nbsp;7.6</a>)
    1971       </p>
    1972       <p id="rfc.section.A.p.6">Introduce Cache Directive and Warn Code Registries. (<a href="#cache.control.extensions" title="Cache Control Extensions">Section&nbsp;7.2.3</a> and <a href="#warn.code.extensions" title="Warn Code Extensions">Section&nbsp;7.6.8</a>)
     1939      <p id="rfc.section.A.p.5">Do not mention RFC 2047 encoding and multiple languages in <a href="#header.warning" class="smpl">Warning</a> header fields anymore, as these aspects never were implemented. (<a href="#header.warning" id="rfc.xref.header.warning.6" title="Warning">Section&nbsp;7.5</a>)
     1940      </p>
     1941      <p id="rfc.section.A.p.6">Introduce Cache Directive and Warn Code Registries. (<a href="#cache.control.extensions" title="Cache Control Extensions">Section&nbsp;7.2.3</a> and <a href="#warn.code.extensions" title="Warn Code Extensions">Section&nbsp;7.5.8</a>)
    19731942      </p>
    19741943      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="imported.abnf" href="#imported.abnf">Imported ABNF</a></h1>
    … …  
    19791948      <p id="rfc.section.B.p.2">The rules below are defined in <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>:
    19801949      </p>
    1981       <div id="rfc.figure.u.15"></div><pre class="inline">  <a href="#imported.abnf" class="smpl">OWS</a>           = &lt;OWS, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
     1950      <div id="rfc.figure.u.14"></div><pre class="inline">  <a href="#imported.abnf" class="smpl">OWS</a>           = &lt;OWS, defined in <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>, <a href="p1-messaging.html#whitespace" title="Whitespace">Section 3.2.1</a>&gt;
    19821951  <a href="#imported.abnf" class="smpl">field-name</a>    = &lt;field-name, defined in <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>, <a href="p1-messaging.html#header.fields" title="Header Fields">Section 3.2</a>&gt;
    19831952  <a href="#imported.abnf" class="smpl">quoted-string</a> = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.13"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>, <a href="p1-messaging.html#field.components" title="Field value components">Section 3.2.4</a>&gt;
    … …  
    19881957  <a href="#imported.abnf" class="smpl">uri-host</a>      = &lt;uri-host, defined in <a href="#Part1" id="rfc.xref.Part1.17"><cite title="HTTP/1.1, part 1: Message Routing and Syntax&#34;">[Part1]</cite></a>, <a href="p1-messaging.html#uri" title="Uniform Resource Identifiers">Section 2.7</a>&gt;
    19891958</pre><p id="rfc.section.B.p.4">The rules below are defined in other parts:</p>
    1990       <div id="rfc.figure.u.16"></div><pre class="inline">  <a href="#imported.abnf" class="smpl">HTTP-date</a>     = &lt;HTTP-date, defined in <a href="#Part2" id="rfc.xref.Part2.7"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>, <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 9.1</a>&gt;
     1959      <div id="rfc.figure.u.15"></div><pre class="inline">  <a href="#imported.abnf" class="smpl">HTTP-date</a>     = &lt;HTTP-date, defined in <a href="#Part2" id="rfc.xref.Part2.8"><cite title="HTTP/1.1, part 2: Semantics and Payloads">[Part2]</cite></a>, <a href="p2-semantics.html#http.date" title="Date/Time Formats">Section 9.1</a>&gt;
    19911960</pre><h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1>
    1992       <div id="rfc.figure.u.17"></div> <pre class="inline"><a href="#header.age" class="smpl">Age</a> = delta-seconds
     1961      <div id="rfc.figure.u.16"></div> <pre class="inline"><a href="#header.age" class="smpl">Age</a> = delta-seconds
    19931962
    19941963<a href="#header.cache-control" class="smpl">Cache-Control</a> = *( "," OWS ) cache-directive *( OWS "," [ OWS
    … …  
    19971966<a href="#header.expires" class="smpl">Expires</a> = HTTP-date
    19981967
    1999 <a href="#imported.abnf" class="smpl">HTTP-date</a> = &lt;HTTP-date, defined in [Part2], Section 6.1&gt;
     1968<a href="#imported.abnf" class="smpl">HTTP-date</a> = &lt;HTTP-date, defined in [Part2], Section 9.1&gt;
    20001969
    20011970<a href="#imported.abnf" class="smpl">OWS</a> = &lt;OWS, defined in [Part1], Section 3.2.1&gt;
    … …  
    20031972<a href="#header.pragma" class="smpl">Pragma</a> = *( "," OWS ) pragma-directive *( OWS "," [ OWS
    20041973 pragma-directive ] )
    2005 
    2006 <a href="#header.vary" class="smpl">Vary</a> = "*" / ( *( "," OWS ) field-name *( OWS "," [ OWS field-name ]
    2007  ) )
    20081974
    20091975<a href="#header.warning" class="smpl">Warning</a> = *( "," OWS ) warning-value *( OWS "," [ OWS warning-value ]
    … …  
    20342000<a href="#header.warning" class="smpl">warning-value</a> = warn-code SP warn-agent SP warn-text [ SP warn-date
    20352001 ]
    2036 </pre> <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
     2002</pre> <div id="rfc.figure.u.17"></div>
     2003      <p>ABNF diagnostics:</p><pre class="inline">; field-name defined but not used
     2004</pre><h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
    20372005      <p id="rfc.section.D.p.1">Changes up to the first Working Group Last Call draft are summarized in &lt;<a href="http://trac.tools.ietf.org/html/draft-ietf-httpbis-p6-cache-19#appendix-C">http://trac.tools.ietf.org/html/draft-ietf-httpbis-p6-cache-19#appendix-C</a>&gt;.
    20382006      </p>
    … …  
    20692037         <ul class="ind">
    20702038            <li><a id="rfc.index.1" href="#rfc.index.1"><b>1</b></a><ul>
    2071                   <li>110 Response is Stale (warn code)&nbsp;&nbsp;<a href="#rfc.iref.76"><b>7.6.1</b></a>, <a href="#rfc.xref.warn.110.1">9.2</a></li>
    2072                   <li>111 Revalidation Failed (warn code)&nbsp;&nbsp;<a href="#rfc.iref.77"><b>7.6.2</b></a>, <a href="#rfc.xref.warn.111.1">9.2</a></li>
    2073                   <li>112 Disconnected Operation (warn code)&nbsp;&nbsp;<a href="#rfc.iref.78"><b>7.6.3</b></a>, <a href="#rfc.xref.warn.112.1">9.2</a></li>
    2074                   <li>113 Heuristic Expiration (warn code)&nbsp;&nbsp;<a href="#rfc.iref.79"><b>7.6.4</b></a>, <a href="#rfc.xref.warn.113.1">9.2</a></li>
    2075                   <li>199 Miscellaneous Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.80"><b>7.6.5</b></a>, <a href="#rfc.xref.warn.199.1">9.2</a></li>
     2039                  <li>110 Response is Stale (warn code)&nbsp;&nbsp;<a href="#rfc.iref.73"><b>7.5.1</b></a>, <a href="#rfc.xref.warn.110.1">9.2</a></li>
     2040                  <li>111 Revalidation Failed (warn code)&nbsp;&nbsp;<a href="#rfc.iref.74"><b>7.5.2</b></a>, <a href="#rfc.xref.warn.111.1">9.2</a></li>
     2041                  <li>112 Disconnected Operation (warn code)&nbsp;&nbsp;<a href="#rfc.iref.75"><b>7.5.3</b></a>, <a href="#rfc.xref.warn.112.1">9.2</a></li>
     2042                  <li>113 Heuristic Expiration (warn code)&nbsp;&nbsp;<a href="#rfc.iref.76"><b>7.5.4</b></a>, <a href="#rfc.xref.warn.113.1">9.2</a></li>
     2043                  <li>199 Miscellaneous Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.77"><b>7.5.5</b></a>, <a href="#rfc.xref.warn.199.1">9.2</a></li>
    20762044               </ul>
    20772045            </li>
    20782046            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    2079                   <li>214 Transformation Applied (warn code)&nbsp;&nbsp;<a href="#rfc.iref.81"><b>7.6.6</b></a>, <a href="#rfc.xref.warn.214.1">9.2</a></li>
    2080                   <li>299 Miscellaneous Persistent Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.82"><b>7.6.7</b></a>, <a href="#rfc.xref.warn.299.1">9.2</a></li>
     2047                  <li>214 Transformation Applied (warn code)&nbsp;&nbsp;<a href="#rfc.iref.78"><b>7.5.6</b></a>, <a href="#rfc.xref.warn.214.1">9.2</a></li>
     2048                  <li>299 Miscellaneous Persistent Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.79"><b>7.5.7</b></a>, <a href="#rfc.xref.warn.299.1">9.2</a></li>
    20812049               </ul>
    20822050            </li>
    … …  
    21322100                        <li><tt>Pragma</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.6"><b>7.4</b></a></li>
    21332101                        <li><tt>pragma-directive</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.7"><b>7.4</b></a></li>
    2134                         <li><tt>Vary</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>7.5</b></a></li>
    2135                         <li><tt>warn-agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>7.6</b></a></li>
    2136                         <li><tt>warn-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>7.6</b></a></li>
    2137                         <li><tt>warn-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.15"><b>7.6</b></a></li>
    2138                         <li><tt>warn-text</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>7.6</b></a></li>
    2139                         <li><tt>Warning</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>7.6</b></a></li>
    2140                         <li><tt>warning-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>7.6</b></a></li>
     2102                        <li><tt>warn-agent</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.12"><b>7.5</b></a></li>
     2103                        <li><tt>warn-code</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.11"><b>7.5</b></a></li>
     2104                        <li><tt>warn-date</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.14"><b>7.5</b></a></li>
     2105                        <li><tt>warn-text</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.13"><b>7.5</b></a></li>
     2106                        <li><tt>Warning</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.9"><b>7.5</b></a></li>
     2107                        <li><tt>warning-value</tt>&nbsp;&nbsp;<a href="#rfc.iref.g.10"><b>7.5</b></a></li>
    21412108                     </ul>
    21422109                  </li>
    … …  
    21502117                        <li>Expires&nbsp;&nbsp;<a href="#rfc.xref.header.expires.1">3</a>, <a href="#rfc.xref.header.expires.2">4.1</a>, <a href="#rfc.xref.header.expires.3">4.1.1</a>, <a href="#rfc.iref.h.4"><b>7.3</b></a>, <a href="#rfc.xref.header.expires.4">9.3</a></li>
    21512118                        <li>Pragma&nbsp;&nbsp;<a href="#rfc.xref.header.pragma.1">4</a>, <a href="#rfc.xref.header.pragma.2">7.2</a>, <a href="#rfc.iref.h.5"><b>7.4</b></a>, <a href="#rfc.xref.header.pragma.3">9.3</a></li>
    2152                         <li>Vary&nbsp;&nbsp;<a href="#rfc.xref.header.vary.1">4.3</a>, <a href="#rfc.iref.h.6"><b>7.5</b></a>, <a href="#rfc.xref.header.vary.2">9.3</a></li>
    2153                         <li>Warning&nbsp;&nbsp;<a href="#rfc.xref.header.warning.1">4.1.4</a>, <a href="#rfc.xref.header.warning.2">4.2.1</a>, <a href="#rfc.xref.header.warning.3">4.4</a>, <a href="#rfc.xref.header.warning.4">5</a>, <a href="#rfc.iref.h.7"><b>7.6</b></a>, <a href="#rfc.xref.header.warning.5">9.3</a>, <a href="#rfc.xref.header.warning.6">A</a></li>
     2119                        <li>Warning&nbsp;&nbsp;<a href="#rfc.xref.header.warning.1">4.1.4</a>, <a href="#rfc.xref.header.warning.2">4.2.1</a>, <a href="#rfc.xref.header.warning.3">4.4</a>, <a href="#rfc.xref.header.warning.4">5</a>, <a href="#rfc.iref.h.6"><b>7.5</b></a>, <a href="#rfc.xref.header.warning.5">9.3</a>, <a href="#rfc.xref.header.warning.6">A</a></li>
    21542120                     </ul>
    21552121                  </li>
    … …  
    22192185                     </ul>
    22202186                  </li>
    2221                   <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">2</a>, <a href="#rfc.xref.Part2.2">4</a>, <a href="#rfc.xref.Part2.3">4.1.2</a>, <a href="#rfc.xref.Part2.4">4.1.3</a>, <a href="#rfc.xref.Part2.5">6</a>, <a href="#rfc.xref.Part2.6">7.3</a>, <a href="#Part2"><b>12.1</b></a>, <a href="#rfc.xref.Part2.7">B</a><ul>
    2222                         <li><em>Section 5.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.2">4</a>, <a href="#rfc.xref.Part2.5">6</a></li>
     2187                  <li><em>Part2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.1">2</a>, <a href="#rfc.xref.Part2.2">4</a>, <a href="#rfc.xref.Part2.3">4.1.2</a>, <a href="#rfc.xref.Part2.4">4.1.3</a>, <a href="#rfc.xref.Part2.5">4.3</a>, <a href="#rfc.xref.Part2.6">6</a>, <a href="#rfc.xref.Part2.7">7.3</a>, <a href="#Part2"><b>12.1</b></a>, <a href="#rfc.xref.Part2.8">B</a><ul>
     2188                        <li><em>Section 5.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.2">4</a>, <a href="#rfc.xref.Part2.6">6</a></li>
    22232189                        <li><em>Section 7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.3">4.1.2</a></li>
    22242190                        <li><em>Section 8.2.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.4">4.1.3</a></li>
    2225                         <li><em>Section 9.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.6">7.3</a>, <a href="#rfc.xref.Part2.7">B</a></li>
     2191                        <li><em>Section 8.2.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.5">4.3</a></li>
     2192                        <li><em>Section 9.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part2.7">7.3</a>, <a href="#rfc.xref.Part2.8">B</a></li>
    22262193                     </ul>
    22272194                  </li>
    … …  
    22682235                  </li>
    22692236                  <li><em>RFC3864</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC3864.1">9.3</a>, <a href="#RFC3864"><b>12.2</b></a></li>
    2270                   <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">7.2.3</a>, <a href="#rfc.xref.RFC5226.2">7.6.8</a>, <a href="#RFC5226"><b>12.2</b></a><ul>
    2271                         <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">7.2.3</a>, <a href="#rfc.xref.RFC5226.2">7.6.8</a></li>
     2237                  <li><em>RFC5226</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">7.2.3</a>, <a href="#rfc.xref.RFC5226.2">7.5.8</a>, <a href="#RFC5226"><b>12.2</b></a><ul>
     2238                        <li><em>Section 4.1</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC5226.1">7.2.3</a>, <a href="#rfc.xref.RFC5226.2">7.5.8</a></li>
    22722239                     </ul>
    22732240                  </li>
    … …  
    22992266                     </ul>
    23002267                  </li>
    2301                   <li>Vary header field&nbsp;&nbsp;<a href="#rfc.xref.header.vary.1">4.3</a>, <a href="#rfc.iref.v.3"><b>7.5</b></a>, <a href="#rfc.xref.header.vary.2">9.3</a></li>
    23022268               </ul>
    23032269            </li>
    … …  
    23052271                  <li>Warn Codes&nbsp;&nbsp;
    23062272                     <ul>
    2307                         <li>110 Response is Stale&nbsp;&nbsp;<a href="#rfc.iref.w.2"><b>7.6.1</b></a>, <a href="#rfc.xref.warn.110.1">9.2</a></li>
    2308                         <li>111 Revalidation Failed&nbsp;&nbsp;<a href="#rfc.iref.w.3"><b>7.6.2</b></a>, <a href="#rfc.xref.warn.111.1">9.2</a></li>
    2309                         <li>112 Disconnected Operation&nbsp;&nbsp;<a href="#rfc.iref.w.4"><b>7.6.3</b></a>, <a href="#rfc.xref.warn.112.1">9.2</a></li>
    2310                         <li>113 Heuristic Expiration&nbsp;&nbsp;<a href="#rfc.iref.w.5"><b>7.6.4</b></a>, <a href="#rfc.xref.warn.113.1">9.2</a></li>
    2311                         <li>199 Miscellaneous Warning&nbsp;&nbsp;<a href="#rfc.iref.w.6"><b>7.6.5</b></a>, <a href="#rfc.xref.warn.199.1">9.2</a></li>
    2312                         <li>214 Transformation Applied&nbsp;&nbsp;<a href="#rfc.iref.w.7"><b>7.6.6</b></a>, <a href="#rfc.xref.warn.214.1">9.2</a></li>
    2313                         <li>299 Miscellaneous Persistent Warning&nbsp;&nbsp;<a href="#rfc.iref.w.8"><b>7.6.7</b></a>, <a href="#rfc.xref.warn.299.1">9.2</a></li>
    2314                      </ul>
    2315                   </li>
    2316                   <li>Warning header field&nbsp;&nbsp;<a href="#rfc.xref.header.warning.1">4.1.4</a>, <a href="#rfc.xref.header.warning.2">4.2.1</a>, <a href="#rfc.xref.header.warning.3">4.4</a>, <a href="#rfc.xref.header.warning.4">5</a>, <a href="#rfc.iref.w.1"><b>7.6</b></a>, <a href="#rfc.xref.header.warning.5">9.3</a>, <a href="#rfc.xref.header.warning.6">A</a></li>
     2273                        <li>110 Response is Stale&nbsp;&nbsp;<a href="#rfc.iref.w.2"><b>7.5.1</b></a>, <a href="#rfc.xref.warn.110.1">9.2</a></li>
     2274                        <li>111 Revalidation Failed&nbsp;&nbsp;<a href="#rfc.iref.w.3"><b>7.5.2</b></a>, <a href="#rfc.xref.warn.111.1">9.2</a></li>
     2275                        <li>112 Disconnected Operation&nbsp;&nbsp;<a href="#rfc.iref.w.4"><b>7.5.3</b></a>, <a href="#rfc.xref.warn.112.1">9.2</a></li>
     2276                        <li>113 Heuristic Expiration&nbsp;&nbsp;<a href="#rfc.iref.w.5"><b>7.5.4</b></a>, <a href="#rfc.xref.warn.113.1">9.2</a></li>
     2277                        <li>199 Miscellaneous Warning&nbsp;&nbsp;<a href="#rfc.iref.w.6"><b>7.5.5</b></a>, <a href="#rfc.xref.warn.199.1">9.2</a></li>
     2278                        <li>214 Transformation Applied&nbsp;&nbsp;<a href="#rfc.iref.w.7"><b>7.5.6</b></a>, <a href="#rfc.xref.warn.214.1">9.2</a></li>
     2279                        <li>299 Miscellaneous Persistent Warning&nbsp;&nbsp;<a href="#rfc.iref.w.8"><b>7.5.7</b></a>, <a href="#rfc.xref.warn.299.1">9.2</a></li>
     2280                     </ul>
     2281                  </li>
     2282                  <li>Warning header field&nbsp;&nbsp;<a href="#rfc.xref.header.warning.1">4.1.4</a>, <a href="#rfc.xref.header.warning.2">4.2.1</a>, <a href="#rfc.xref.header.warning.3">4.4</a>, <a href="#rfc.xref.header.warning.4">5</a>, <a href="#rfc.iref.w.1"><b>7.5</b></a>, <a href="#rfc.xref.header.warning.5">9.3</a>, <a href="#rfc.xref.header.warning.6">A</a></li>
    23172283               </ul>
    23182284            </li>
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