Changeset 496

Timestamp:

Mar 3, 2009, 10:58:09 PM (11 years ago)

Author:

mnot@…

Message:

clean up validation model

File:

• draft-ietf-httpbis/latest-roy/p6-cache.xml (modified) (1 diff)

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

@@ -640 +640 @@
 
       <section anchor="validation.model" title="Validation Model">
-        <t>When a cache has a stale response that it would like to use, it &SHOULD; first check
-          with the origin server (or possibly an intermediate cache) to see if
-          it is still usable. This is called "validating" or "revalidating" the stored response.</t>
-        <t>HTTP's conditional request mechanism, defined in &conditional;, is used to avoid
-          retransmitting the response payload when the stored response is valid. When a stored
-          response includes one or more "cache validators", such as the field values of an ETag or
-          Last-Modified header field, then a validating GET request &SHOULD; be made conditional
-          to those field values; a 304 (Not Modified) response status code indicates that the stored 
+        <t>Checking with the origin server to see if a stale or otherwise unusable cached response
+        can be reused is called "validating" or "revalidating." Doing so potentially avoids
+        the overhead of retransmitting the response body when the stored response is valid.</t>
+        <t>HTTP's conditional request mechanism &conditional; is used for this purpose. When a stored
+          response includes one or more validators, such as the field values of an ETag or
+          Last-Modified header field, then a validating request &SHOULD; be made conditional
+          to those field values.</t>
+         <t>A 304 (Not Modified) response status code indicates that the stored 
           response can be updated and reused; see <xref target="combining.headers"/>.</t>
-        <t>If the cache receives a full response (i.e., one with payload), it is used to satisfy the
-        request and replace the stored response.</t>
+        <t>If instead the cache receives a full response (i.e., one with a response body), it is used to satisfy the
+        request and replace the stored response. <cref>Should there be a requirement here?</cref></t>
         <t>If a cache receives a 5xx response while attempting to validate a response, it &MAY;
           either forward this response to the requesting client, or act as if the server failed to
           respond. In the latter case, it &MAY; return a previously stored response unless the
           stored response includes the "must-revalidate" cache directive (see <xref
-            target="cache-response-directive" />).</t>
+            target="serving.stale.responses" />).</t>
       </section>