Changeset 1731 for draft-ietf-httpbis/latest

Timestamp:

06/07/12 03:51:34 (10 years ago)

Author:

julian.reschke@…

Message:

add advice on how to treat multiple instances of freshness information (see #353)

Location:

draft-ietf-httpbis/latest

Files:

• p6-cache.html (modified) (7 diffs)
• p6-cache.xml (modified) (2 diffs)

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

@@ -452 +452 @@
   } 
   @bottom-center {
-       content: "Expires January 6, 2013"; 
+       content: "Expires January 7, 2013"; 
   } 
   @bottom-right {
@@ -494 +494 @@
       <meta name="dct.creator" content="Reschke, J. F.">
       <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-p6-cache-latest">
-      <meta name="dct.issued" scheme="ISO8601" content="2012-07-05">
+      <meta name="dct.issued" scheme="ISO8601" content="2012-07-06">
       <meta name="dct.replaces" content="urn:ietf:rfc:2616">
       <meta name="dct.abstract" content="The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypertext information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 6 of the seven-part specification that defines the protocol referred to as &#34;HTTP/1.1&#34; and, taken together, obsoletes RFC 2616. Part 6 defines requirements on HTTP caches and the associated header fields that control cache behavior or indicate cacheable response messages.">
@@ -520 +520 @@
             </tr>
             <tr>
-               <td class="left">Expires: January 6, 2013</td>
+               <td class="left">Expires: January 7, 2013</td>
                <td class="right">M. Nottingham, Editor</td>
             </tr>
@@ -537 +537 @@
             <tr>
                <td class="left"></td>
-               <td class="right">July 5, 2012</td>
+               <td class="right">July 6, 2012</td>
             </tr>
          </tbody>
@@ -567 +567 @@
          in progress”.
       </p>
-      <p>This Internet-Draft will expire on January 6, 2013.</p>
+      <p>This Internet-Draft will expire on January 7, 2013.</p>
       <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
       <p>Copyright © 2012 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
@@ -959 +959 @@
       </ul>
       <p id="rfc.section.2.3.1.p.2">Note that this calculation is not vulnerable to clock skew, since all of the information comes from the origin server.</p>
+      <p id="rfc.section.2.3.1.p.3">When there is more than one value present for a given directive (e.g., two Expires header fields, multiple Cache-Control:
+         max-age directives), it is considered invalid. Caches are encouraged to consider responses that have invalid freshness information
+         to be stale.
+      </p>
       <h4 id="rfc.section.2.3.1.1"><a href="#rfc.section.2.3.1.1">2.3.1.1</a>&nbsp;<a id="heuristic.freshness" href="#heuristic.freshness">Calculating Heuristic Freshness</a></h4>
       <p id="rfc.section.2.3.1.1.p.1">If no explicit expiration time is present in a stored response that has a status code whose definition allows heuristic freshness
@@ -2044 +2048 @@
          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/307">http://tools.ietf.org/wg/httpbis/trac/ticket/307</a>&gt;: "untangle Cache-Control ABNF"
          </li>
+         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/353">http://tools.ietf.org/wg/httpbis/trac/ticket/353</a>&gt;: "Multiple values in Cache-Control headers"
+         </li>
          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/355">http://tools.ietf.org/wg/httpbis/trac/ticket/355</a>&gt;: "Case sensitivity of header fields in CC values"
          </li>

draft-ietf-httpbis/latest/p6-cache.xml

@@ -672 +672 @@
    the information comes from the origin server.
 </t>
+<t>
+   When there is more than one value present for a given directive (e.g., two
+   Expires header fields, multiple Cache-Control: max-age directives), it is
+   considered invalid. Caches are encouraged to consider responses that have
+   invalid freshness information to be stale.
+</t>
 
 <section anchor="heuristic.freshness" title="Calculating Heuristic Freshness">
@@ -2601 +2607 @@
     </t>
     <t>
+      <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/353"/>:
+      "Multiple values in Cache-Control headers"
+    </t>
+    <t>
       <eref target="http://tools.ietf.org/wg/httpbis/trac/ticket/355"/>:
       "Case sensitivity of header fields in CC values"