Ignore:
Timestamp:
13/09/13 11:47:00 (7 years ago)
Author:
fielding@…
Message:

Reduce the burden of processing warn-date to recipients that do something with Warning fields; use warn-code section titles to demonstrate syntax examples (and differentiate from status codes); clarify tortured wording around Age; demonstrate 4am mastery of xslt; addresses #486

File:
1 edited

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

    r2383 r2384  
    638638               <li><a href="#rfc.section.5.4">5.4</a>&nbsp;&nbsp;&nbsp;<a href="#header.pragma">Pragma</a></li>
    639639               <li><a href="#rfc.section.5.5">5.5</a>&nbsp;&nbsp;&nbsp;<a href="#header.warning">Warning</a><ul>
    640                      <li><a href="#rfc.section.5.5.1">5.5.1</a>&nbsp;&nbsp;&nbsp;<a href="#warn.110">110 Response is Stale</a></li>
    641                      <li><a href="#rfc.section.5.5.2">5.5.2</a>&nbsp;&nbsp;&nbsp;<a href="#warn.111">111 Revalidation Failed</a></li>
    642                      <li><a href="#rfc.section.5.5.3">5.5.3</a>&nbsp;&nbsp;&nbsp;<a href="#warn.112">112 Disconnected Operation</a></li>
    643                      <li><a href="#rfc.section.5.5.4">5.5.4</a>&nbsp;&nbsp;&nbsp;<a href="#warn.113">113 Heuristic Expiration</a></li>
    644                      <li><a href="#rfc.section.5.5.5">5.5.5</a>&nbsp;&nbsp;&nbsp;<a href="#warn.199">199 Miscellaneous Warning</a></li>
    645                      <li><a href="#rfc.section.5.5.6">5.5.6</a>&nbsp;&nbsp;&nbsp;<a href="#warn.214">214 Transformation Applied</a></li>
    646                      <li><a href="#rfc.section.5.5.7">5.5.7</a>&nbsp;&nbsp;&nbsp;<a href="#warn.299">299 Miscellaneous Persistent Warning</a></li>
    647                      <li><a href="#rfc.section.5.5.8">5.5.8</a>&nbsp;&nbsp;&nbsp;<a href="#warn.code.extensions">Warn Code Extensions</a></li>
     640                     <li><a href="#rfc.section.5.5.1">5.5.1</a>&nbsp;&nbsp;&nbsp;<a href="#warn.110">Warning: 110 means "Response is Stale"</a></li>
     641                     <li><a href="#rfc.section.5.5.2">5.5.2</a>&nbsp;&nbsp;&nbsp;<a href="#warn.111">Warning: 111 means "Revalidation Failed"</a></li>
     642                     <li><a href="#rfc.section.5.5.3">5.5.3</a>&nbsp;&nbsp;&nbsp;<a href="#warn.112">Warning: 112 means "Disconnected Operation"</a></li>
     643                     <li><a href="#rfc.section.5.5.4">5.5.4</a>&nbsp;&nbsp;&nbsp;<a href="#warn.113">Warning: 113 means "Heuristic Expiration"</a></li>
     644                     <li><a href="#rfc.section.5.5.5">5.5.5</a>&nbsp;&nbsp;&nbsp;<a href="#warn.199">Warning: 199 means "Miscellaneous Warning"</a></li>
     645                     <li><a href="#rfc.section.5.5.6">5.5.6</a>&nbsp;&nbsp;&nbsp;<a href="#warn.214">Warning: 214 means "Transformation Applied"</a></li>
     646                     <li><a href="#rfc.section.5.5.7">5.5.7</a>&nbsp;&nbsp;&nbsp;<a href="#warn.299">Warning: 299 means "Miscellaneous Persistent Warning"</a></li>
    648647                  </ul>
    649648               </li>
     
    955954         time. A typical setting of this fraction might be 10%.
    956955      </p>
    957       <p id="rfc.section.4.2.2.p.4">When a heuristic is used to calculate freshness lifetime, a cache <em class="bcp14">SHOULD</em> attach a <a href="#header.warning" class="smpl">Warning</a> header field with a 113 warn-code to the response if its current_age is more than 24 hours and such a warning is not already
     956      <p id="rfc.section.4.2.2.p.4">When a heuristic is used to calculate freshness lifetime, a cache <em class="bcp14">SHOULD</em> generate a <a href="#header.warning" class="smpl">Warning</a> header field with a 113 warn-code in the response if its current_age is more than 24 hours and such a warning is not already
    958957         present.
    959958      </p>
     
    10311030         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;5.2.1</a>).
    10321031      </p>
    1033       <p id="rfc.section.4.2.4.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.2" title="Warning">Section&nbsp;5.5</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.
    1034       </p>
    1035       <div id="rfc.iref.f.3"></div>
    1036       <p id="rfc.section.4.2.4.p.5">Note that if a cache receives a <dfn>first-hand</dfn> response (one where the freshness model is not in use; i.e., its age is 0, whether it is 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 <em class="bcp14">MAY</em> forward it to the requesting client without adding a new <a href="#header.warning" class="smpl">Warning</a> (but without removing any existing Warning header fields). A cache ought not attempt to validate a response simply because
    1037          that response became stale in transit.
     1032      <p id="rfc.section.4.2.4.p.4">A cache <em class="bcp14">SHOULD</em> generate 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.2" title="Warning">Section&nbsp;5.5</a>) in stale responses. Likewise, a cache <em class="bcp14">SHOULD</em> generate a 112 warn-code in stale responses if the cache is disconnected.
     1033      </p>
     1034      <p id="rfc.section.4.2.4.p.5">A cache <em class="bcp14">SHOULD NOT</em> generate a new <a href="#header.warning" class="smpl">Warning</a> header field when forwarding a response that does not have an <a href="#header.age" class="smpl">Age</a> header field, even if the response is already stale. A cache need not validate a response that merely became stale in transit.
    10381035      </p>
    10391036      <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="validation.model" href="#validation.model">Validation</a></h2>
     
    11771174      </p>
    11781175      <div id="rfc.figure.u.6"></div><pre class="inline"><span id="rfc.iref.g.2"></span>  <a href="#header.age" class="smpl">Age</a> = <a href="#delta-seconds" class="smpl">delta-seconds</a>
    1179 </pre><p id="rfc.section.5.1.p.3">Age field-values are non-negative integers, representing time in seconds (see <a href="#delta-seconds" title="Delta Seconds">Section&nbsp;1.2.1</a>).
    1180       </p>
    1181       <p id="rfc.section.5.1.p.4">The presence of an Age header field in a response implies that a response is not first-hand. However, the converse is not
    1182          true, since HTTP/1.0 caches might not implement the Age header field.
     1176</pre><p id="rfc.section.5.1.p.3">The Age field-value is a non-negative integer, representing time in seconds (see <a href="#delta-seconds" title="Delta Seconds">Section&nbsp;1.2.1</a>).
     1177      </p>
     1178      <p id="rfc.section.5.1.p.4">The presence of an Age header field implies that the response was not generated or validated by the origin server for this
     1179         request. However, lack of an Age header field does not imply the origin was contacted, since the response might have been
     1180         received from an HTTP/1.0 cache that does not implement Age.
    11831181      </p>
    11841182      <div id="rfc.iref.c.5"></div>
     
    14531451      <h2 id="rfc.section.5.5"><a href="#rfc.section.5.5">5.5</a>&nbsp;<a id="header.warning" href="#header.warning">Warning</a></h2>
    14541452      <p id="rfc.section.5.5.p.1">The "Warning" header field is used to carry additional information about the status or transformation of a message that might
    1455          not be reflected in the message. This information is typically used to warn about possible incorrectness introduced by caching
    1456          operations or transformations applied to the payload of the message.
     1453         not be reflected in the status code. This information is typically used to warn about possible incorrectness introduced by
     1454         caching operations or transformations applied to the payload of the message.
    14571455      </p>
    14581456      <p id="rfc.section.5.5.p.2">Warnings can be used for other purposes, both cache-related and otherwise. The use of a warning, rather than an error status
     
    14731471  <a href="#header.warning" class="smpl">warn-text</a>  = <a href="#imported.abnf" class="smpl">quoted-string</a>
    14741472  <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>
    1475 </pre><p id="rfc.section.5.5.p.5">Multiple warnings can be attached to a response (either by the origin server or by a cache), including multiple warnings with
    1476          the same code number, only differing in warn-text.
    1477       </p>
    1478       <p id="rfc.section.5.5.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.
    1479       </p>
    1480       <p id="rfc.section.5.5.p.7">Systems that generate multiple Warning header fields are encouraged to order them with this user agent behavior in mind. New
    1481          Warning header fields are added after any existing Warning header fields.
    1482       </p>
    1483       <p id="rfc.section.5.5.p.8">Warnings are assigned three digit warn-codes. The first digit indicates whether the Warning is required to be deleted from
     1473</pre><p id="rfc.section.5.5.p.5">Multiple warnings can be generated in a response (either by the origin server or by a cache), including multiple warnings
     1474         with the same warn-code number that only differ in warn-text.
     1475      </p>
     1476      <p id="rfc.section.5.5.p.6">A user agent that receives one or more Warning header fields <em class="bcp14">SHOULD</em> inform the user of as many of them as possible, in the order that they appear in the response. Senders that generate multiple
     1477         Warning header fields are encouraged to order them with this user agent behavior in mind. A sender that generates new Warning
     1478         header fields <em class="bcp14">MUST</em> append them after any existing Warning header fields.
     1479      </p>
     1480      <p id="rfc.section.5.5.p.7">Warnings are assigned three digit warn-codes. The first digit indicates whether the Warning is required to be deleted from
    14841481         a stored response after validation:
    14851482      </p>
    14861483      <ul>
    1487          <li>1xx Warnings describe the freshness or validation status of the response, and so <em class="bcp14">MUST</em> be deleted by a cache after validation. They can only be generated by a cache when validating a cached entry, and <em class="bcp14">MUST NOT</em> be generated in any other situation.
    1488          </li>
    1489          <li>2xx Warnings describe some aspect of the representation that is not rectified by a validation (for example, a lossy compression
     1484         <li>1xx warn-codes describe the freshness or validation status of the response, and so <em class="bcp14">MUST</em> be deleted by a cache after validation. They can only be generated by a cache when validating a cached entry, and <em class="bcp14">MUST NOT</em> be generated in any other situation.
     1485         </li>
     1486         <li>2xx warn-codes describe some aspect of the representation that is not rectified by a validation (for example, a lossy compression
    14901487            of the representation) and <em class="bcp14">MUST NOT</em> be deleted by a cache after validation, unless a full response is sent, in which case they <em class="bcp14">MUST</em> be.
    14911488         </li>
    14921489      </ul>
    1493       <p id="rfc.section.5.5.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,
    1494          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.
    1495       </p>
    1496       <p id="rfc.section.5.5.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
    1497          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.
    1498       </p>
    1499       <p id="rfc.section.5.5.p.11">The following warn-codes are defined by this specification, each with a recommended warn-text in English, and a description
    1500          of its meaning.
     1490      <p id="rfc.section.5.5.p.8">If a sender generates one or more Warning header fields in a message to be sent to a recipient known to implement only HTTP/1.0,
     1491         the sender <em class="bcp14">MUST</em> include in each generated warning-value a warn-date that matches the <a href="p2-semantics.html#header.date" class="smpl">Date</a> header field in the message.
     1492      </p>
     1493      <p id="rfc.section.5.5.p.9">If a recipient that uses, evaluates, or displays Warning header fields receives a warn-date that is different from the <a href="p2-semantics.html#header.date" class="smpl">Date</a> value in the same message, the recipient <em class="bcp14">MUST</em> exclude the warning-value containing that warn-date before storing, forwarding, or using the message. This allows recipients
     1494         to exclude warning-values that were improperly retained after a cache validation. If all of the warning-values are excluded,
     1495         the recipient <em class="bcp14">MUST</em> exclude the Warning header field as well.
     1496      </p>
     1497      <p id="rfc.section.5.5.p.10">The following warn-codes are defined by this specification, each with a recommended warn-text in English, and a description
     1498         of its meaning. The procedure for defining additional warn codes is described in <a href="#warn.code.registry.procedure" title="Procedure">Section&nbsp;7.2.1</a>.
     1499      </p>
     1500      <div id="rfc.iref.49"></div>
     1501      <div id="rfc.iref.r.1"></div>
     1502      <h3 id="rfc.section.5.5.1"><a href="#rfc.section.5.5.1">5.5.1</a>&nbsp;<a id="warn.110" href="#warn.110">Warning: 110 means "Response is Stale"</a></h3>
     1503      <p id="rfc.section.5.5.1.p.1">A cache <em class="bcp14">SHOULD</em> generate this whenever the sent response is stale.
    15011504      </p>
    15021505      <div id="rfc.iref.50"></div>
    1503       <h3 id="rfc.section.5.5.1"><a href="#rfc.section.5.5.1">5.5.1</a>&nbsp;<a id="warn.110" href="#warn.110">110 Response is Stale</a></h3>
    1504       <p id="rfc.section.5.5.1.p.1">A cache <em class="bcp14">SHOULD</em> generate this whenever the sent response is stale.
    1505       </p>
    1506       <div id="rfc.iref.50"></div>
    1507       <h3 id="rfc.section.5.5.2"><a href="#rfc.section.5.5.2">5.5.2</a>&nbsp;<a id="warn.111" href="#warn.111">111 Revalidation Failed</a></h3>
     1506      <div id="rfc.iref.r.2"></div>
     1507      <h3 id="rfc.section.5.5.2"><a href="#rfc.section.5.5.2">5.5.2</a>&nbsp;<a id="warn.111" href="#warn.111">Warning: 111 means "Revalidation Failed"</a></h3>
    15081508      <p id="rfc.section.5.5.2.p.1">A cache <em class="bcp14">SHOULD</em> generate this when sending a stale response because an attempt to validate the response failed, due to an inability to reach
    15091509         the server.
    15101510      </p>
    1511       <div id="rfc.iref.50"></div>
    1512       <h3 id="rfc.section.5.5.3"><a href="#rfc.section.5.5.3">5.5.3</a>&nbsp;<a id="warn.112" href="#warn.112">112 Disconnected Operation</a></h3>
     1511      <div id="rfc.iref.51"></div>
     1512      <div id="rfc.iref.d.1"></div>
     1513      <h3 id="rfc.section.5.5.3"><a href="#rfc.section.5.5.3">5.5.3</a>&nbsp;<a id="warn.112" href="#warn.112">Warning: 112 means "Disconnected Operation"</a></h3>
    15131514      <p id="rfc.section.5.5.3.p.1">A cache <em class="bcp14">SHOULD</em> generate this if it is intentionally disconnected from the rest of the network for a period of time.
    15141515      </p>
    1515       <div id="rfc.iref.50"></div>
    1516       <h3 id="rfc.section.5.5.4"><a href="#rfc.section.5.5.4">5.5.4</a>&nbsp;<a id="warn.113" href="#warn.113">113 Heuristic Expiration</a></h3>
     1516      <div id="rfc.iref.52"></div>
     1517      <div id="rfc.iref.h.2"></div>
     1518      <h3 id="rfc.section.5.5.4"><a href="#rfc.section.5.5.4">5.5.4</a>&nbsp;<a id="warn.113" href="#warn.113">Warning: 113 means "Heuristic Expiration"</a></h3>
    15171519      <p id="rfc.section.5.5.4.p.1">A cache <em class="bcp14">SHOULD</em> generate this if it heuristically chose a freshness lifetime greater than 24 hours and the response's age is greater than
    15181520         24 hours.
    15191521      </p>
    1520       <div id="rfc.iref.50"></div>
    1521       <h3 id="rfc.section.5.5.5"><a href="#rfc.section.5.5.5">5.5.5</a>&nbsp;<a id="warn.199" href="#warn.199">199 Miscellaneous Warning</a></h3>
     1522      <div id="rfc.iref.53"></div>
     1523      <div id="rfc.iref.m.6"></div>
     1524      <h3 id="rfc.section.5.5.5"><a href="#rfc.section.5.5.5">5.5.5</a>&nbsp;<a id="warn.199" href="#warn.199">Warning: 199 means "Miscellaneous Warning"</a></h3>
    15221525      <p id="rfc.section.5.5.5.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.
    15231526      </p>
    1524       <div id="rfc.iref.50"></div>
    1525       <h3 id="rfc.section.5.5.6"><a href="#rfc.section.5.5.6">5.5.6</a>&nbsp;<a id="warn.214" href="#warn.214">214 Transformation Applied</a></h3>
     1527      <div id="rfc.iref.54"></div>
     1528      <div id="rfc.iref.t.1"></div>
     1529      <h3 id="rfc.section.5.5.6"><a href="#rfc.section.5.5.6">5.5.6</a>&nbsp;<a id="warn.214" href="#warn.214">Warning: 214 means "Transformation Applied"</a></h3>
    15261530      <p id="rfc.section.5.5.6.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,
    15271531         or modifying the representation data, unless this Warning code already appears in the response.
    15281532      </p>
    1529       <div id="rfc.iref.50"></div>
    1530       <h3 id="rfc.section.5.5.7"><a href="#rfc.section.5.5.7">5.5.7</a>&nbsp;<a id="warn.299" href="#warn.299">299 Miscellaneous Persistent Warning</a></h3>
     1533      <div id="rfc.iref.55"></div>
     1534      <div id="rfc.iref.m.7"></div>
     1535      <h3 id="rfc.section.5.5.7"><a href="#rfc.section.5.5.7">5.5.7</a>&nbsp;<a id="warn.299" href="#warn.299">Warning: 299 means "Miscellaneous Persistent Warning"</a></h3>
    15311536      <p id="rfc.section.5.5.7.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.
    1532       </p>
    1533       <h3 id="rfc.section.5.5.8"><a href="#rfc.section.5.5.8">5.5.8</a>&nbsp;<a id="warn.code.extensions" href="#warn.code.extensions">Warn Code Extensions</a></h3>
    1534       <p id="rfc.section.5.5.8.p.1">Extension warn codes can be defined; see <a href="#warn.code.registry.procedure" title="Procedure">Section&nbsp;7.2.1</a> for details.
    15351537      </p>
    15361538      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="history.lists" href="#history.lists">History Lists</a></h1>
     
    16821684                  <td class="left">110</td>
    16831685                  <td class="left">Response is Stale</td>
    1684                   <td class="left"><a href="#warn.110" id="rfc.xref.warn.110.1" title="110 Response is Stale">Section&nbsp;5.5.1</a>
     1686                  <td class="left"><a href="#warn.110" id="rfc.xref.warn.110.1" title="Warning: 110 means &#34;Response is Stale&#34;">Section&nbsp;5.5.1</a>
    16851687                  </td>
    16861688               </tr>
     
    16881690                  <td class="left">111</td>
    16891691                  <td class="left">Revalidation Failed</td>
    1690                   <td class="left"><a href="#warn.111" id="rfc.xref.warn.111.1" title="111 Revalidation Failed">Section&nbsp;5.5.2</a>
     1692                  <td class="left"><a href="#warn.111" id="rfc.xref.warn.111.1" title="Warning: 111 means &#34;Revalidation Failed&#34;">Section&nbsp;5.5.2</a>
    16911693                  </td>
    16921694               </tr>
     
    16941696                  <td class="left">112</td>
    16951697                  <td class="left">Disconnected Operation</td>
    1696                   <td class="left"><a href="#warn.112" id="rfc.xref.warn.112.1" title="112 Disconnected Operation">Section&nbsp;5.5.3</a>
     1698                  <td class="left"><a href="#warn.112" id="rfc.xref.warn.112.1" title="Warning: 112 means &#34;Disconnected Operation&#34;">Section&nbsp;5.5.3</a>
    16971699                  </td>
    16981700               </tr>
     
    17001702                  <td class="left">113</td>
    17011703                  <td class="left">Heuristic Expiration</td>
    1702                   <td class="left"><a href="#warn.113" id="rfc.xref.warn.113.1" title="113 Heuristic Expiration">Section&nbsp;5.5.4</a>
     1704                  <td class="left"><a href="#warn.113" id="rfc.xref.warn.113.1" title="Warning: 113 means &#34;Heuristic Expiration&#34;">Section&nbsp;5.5.4</a>
    17031705                  </td>
    17041706               </tr>
     
    17061708                  <td class="left">199</td>
    17071709                  <td class="left">Miscellaneous Warning</td>
    1708                   <td class="left"><a href="#warn.199" id="rfc.xref.warn.199.1" title="199 Miscellaneous Warning">Section&nbsp;5.5.5</a>
     1710                  <td class="left"><a href="#warn.199" id="rfc.xref.warn.199.1" title="Warning: 199 means &#34;Miscellaneous Warning&#34;">Section&nbsp;5.5.5</a>
    17091711                  </td>
    17101712               </tr>
     
    17121714                  <td class="left">214</td>
    17131715                  <td class="left">Transformation Applied</td>
    1714                   <td class="left"><a href="#warn.214" id="rfc.xref.warn.214.1" title="214 Transformation Applied">Section&nbsp;5.5.6</a>
     1716                  <td class="left"><a href="#warn.214" id="rfc.xref.warn.214.1" title="Warning: 214 means &#34;Transformation Applied&#34;">Section&nbsp;5.5.6</a>
    17151717                  </td>
    17161718               </tr>
     
    17181720                  <td class="left">299</td>
    17191721                  <td class="left">Miscellaneous Persistent Warning</td>
    1720                   <td class="left"><a href="#warn.299" id="rfc.xref.warn.299.1" title="299 Miscellaneous Persistent Warning">Section&nbsp;5.5.7</a>
     1722                  <td class="left"><a href="#warn.299" id="rfc.xref.warn.299.1" title="Warning: 299 means &#34;Miscellaneous Persistent Warning&#34;">Section&nbsp;5.5.7</a>
    17211723                  </td>
    17221724               </tr>
     
    19931995<a href="#header.warning" class="smpl">warn-date</a> = DQUOTE HTTP-date DQUOTE
    19941996<a href="#header.warning" class="smpl">warn-text</a> = quoted-string
    1995 <a href="#header.warning" class="smpl">warning-value</a> = warn-code SP warn-agent SP warn-text SP warn-date
     1997<a href="#header.warning" class="smpl">warning-value</a> = warn-code SP warn-agent SP warn-text [ SP warn-date ]
    19961998</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>
    19971999      <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;.
     
    20582060      <p id="rfc.section.D.5.p.1">None yet.</p>
    20592061      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    2060       <p class="noprint"><a href="#rfc.index.1">1</a> <a href="#rfc.index.2">2</a> <a href="#rfc.index.A">A</a> <a href="#rfc.index.B">B</a> <a href="#rfc.index.C">C</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.M">M</a> <a href="#rfc.index.N">N</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.V">V</a> <a href="#rfc.index.W">W</a>
     2062      <p class="noprint"><a href="#rfc.index.1">1</a> <a href="#rfc.index.2">2</a> <a href="#rfc.index.A">A</a> <a href="#rfc.index.B">B</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.M">M</a> <a href="#rfc.index.N">N</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.V">V</a> <a href="#rfc.index.W">W</a>
    20612063      </p>
    20622064      <div class="print2col">
    20632065         <ul class="ind">
    20642066            <li><a id="rfc.index.1" href="#rfc.index.1"><b>1</b></a><ul>
    2065                   <li>110 Response is Stale (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.1</b></a>, <a href="#rfc.xref.warn.110.1">7.2.2</a></li>
    2066                   <li>111 Revalidation Failed (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.2</b></a>, <a href="#rfc.xref.warn.111.1">7.2.2</a></li>
    2067                   <li>112 Disconnected Operation (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.3</b></a>, <a href="#rfc.xref.warn.112.1">7.2.2</a></li>
    2068                   <li>113 Heuristic Expiration (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.4</b></a>, <a href="#rfc.xref.warn.113.1">7.2.2</a></li>
    2069                   <li>199 Miscellaneous Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.5</b></a>, <a href="#rfc.xref.warn.199.1">7.2.2</a></li>
     2067                  <li>110 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.49"><b>5.5.1</b></a>, <a href="#rfc.xref.warn.110.1">7.2.2</a></li>
     2068                  <li>111 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.2</b></a>, <a href="#rfc.xref.warn.111.1">7.2.2</a></li>
     2069                  <li>112 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.51"><b>5.5.3</b></a>, <a href="#rfc.xref.warn.112.1">7.2.2</a></li>
     2070                  <li>113 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.52"><b>5.5.4</b></a>, <a href="#rfc.xref.warn.113.1">7.2.2</a></li>
     2071                  <li>199 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.53"><b>5.5.5</b></a>, <a href="#rfc.xref.warn.199.1">7.2.2</a></li>
    20702072               </ul>
    20712073            </li>
    20722074            <li><a id="rfc.index.2" href="#rfc.index.2"><b>2</b></a><ul>
    2073                   <li>214 Transformation Applied (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.6</b></a>, <a href="#rfc.xref.warn.214.1">7.2.2</a></li>
    2074                   <li>299 Miscellaneous Persistent Warning (warn code)&nbsp;&nbsp;<a href="#rfc.iref.50"><b>5.5.7</b></a>, <a href="#rfc.xref.warn.299.1">7.2.2</a></li>
     2075                  <li>214 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.54"><b>5.5.6</b></a>, <a href="#rfc.xref.warn.214.1">7.2.2</a></li>
     2076                  <li>299 (warn-code)&nbsp;&nbsp;<a href="#rfc.iref.55"><b>5.5.7</b></a>, <a href="#rfc.xref.warn.299.1">7.2.2</a></li>
    20752077               </ul>
    20762078            </li>
     
    20912093               </ul>
    20922094            </li>
     2095            <li><a id="rfc.index.D" href="#rfc.index.D"><b>D</b></a><ul>
     2096                  <li>Disconnected Operation (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.d.1"><b>5.5.3</b></a>, <a href="#rfc.xref.warn.112.1">7.2.2</a></li>
     2097               </ul>
     2098            </li>
    20932099            <li><a id="rfc.index.E" href="#rfc.index.E"><b>E</b></a><ul>
    20942100                  <li>Expires header field&nbsp;&nbsp;<a href="#rfc.xref.header.expires.1">3</a>, <a href="#rfc.xref.header.expires.2">4.2</a>, <a href="#rfc.xref.header.expires.3">4.2.1</a>, <a href="#rfc.iref.e.2"><b>5.3</b></a>, <a href="#rfc.xref.header.expires.4">7.3</a>, <a href="#rfc.xref.header.expires.5">A</a></li>
     
    20972103            </li>
    20982104            <li><a id="rfc.index.F" href="#rfc.index.F"><b>F</b></a><ul>
    2099                   <li>first-hand&nbsp;&nbsp;<a href="#rfc.iref.f.3">4.2.4</a></li>
    21002105                  <li>fresh&nbsp;&nbsp;<a href="#rfc.iref.f.1">4.2</a></li>
    21012106                  <li>freshness lifetime&nbsp;&nbsp;<a href="#rfc.iref.f.2">4.2</a></li>
     
    21242129            </li>
    21252130            <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul>
     2131                  <li>Heuristic Expiration (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.h.2"><b>5.5.4</b></a>, <a href="#rfc.xref.warn.113.1">7.2.2</a></li>
    21262132                  <li>heuristic expiration time&nbsp;&nbsp;<a href="#rfc.iref.h.1">4.2</a></li>
    21272133               </ul>
     
    21312137                  <li>max-stale (cache directive)&nbsp;&nbsp;<a href="#rfc.iref.m.2"><b>5.2.1.2</b></a></li>
    21322138                  <li>min-fresh (cache directive)&nbsp;&nbsp;<a href="#rfc.iref.m.3"><b>5.2.1.3</b></a></li>
     2139                  <li>Miscellaneous Persistent Warning (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.m.7"><b>5.5.7</b></a>, <a href="#rfc.xref.warn.299.1">7.2.2</a></li>
     2140                  <li>Miscellaneous Warning (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.m.6"><b>5.5.5</b></a>, <a href="#rfc.xref.warn.199.1">7.2.2</a></li>
    21332141                  <li>must-revalidate (cache directive)&nbsp;&nbsp;<a href="#rfc.iref.m.4"><b>5.2.2.1</b></a></li>
    21342142               </ul>
     
    21952203            </li>
    21962204            <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul>
     2205                  <li>Response is Stale (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.r.1"><b>5.5.1</b></a>, <a href="#rfc.xref.warn.110.1">7.2.2</a></li>
     2206                  <li>Revalidation Failed (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.r.2"><b>5.5.2</b></a>, <a href="#rfc.xref.warn.111.1">7.2.2</a></li>
    21972207                  <li><em>RFC1305</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1305.1">4.2.3</a>, <a href="#RFC1305"><b>10.2</b></a></li>
    21982208                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>10.1</b></a></li>
     
    22242234               </ul>
    22252235            </li>
     2236            <li><a id="rfc.index.T" href="#rfc.index.T"><b>T</b></a><ul>
     2237                  <li>Transformation Applied (warn-text)&nbsp;&nbsp;<a href="#rfc.iref.t.1"><b>5.5.6</b></a>, <a href="#rfc.xref.warn.214.1">7.2.2</a></li>
     2238               </ul>
     2239            </li>
    22262240            <li><a id="rfc.index.V" href="#rfc.index.V"><b>V</b></a><ul>
    22272241                  <li>validator&nbsp;&nbsp;<a href="#rfc.iref.v.1">4.3.1</a></li>
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