Changeset 2093 for draft-ietf-httpbis/latest/p4-conditional.xml

Timestamp:

06/01/13 11:23:55 (10 years ago)

Author:

fielding@…

Message:

delegate cache requirements from 304 to p6; related to #406

File:

• draft-ietf-httpbis/latest/p4-conditional.xml (modified) (2 diffs)

draft-ietf-httpbis/latest/p4-conditional.xml

@@ -27 +27 @@
   <!ENTITY semantics                  "<xref target='Part2' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
   <!ENTITY caching                    "<xref target='Part6' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
+  <!ENTITY freshening-responses       "<xref target='Part6' x:rel='#freshening.responses' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
   <!ENTITY header-accept-encoding     "<xref target='Part2' x:rel='#header.accept-encoding' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
   <!ENTITY header-if-range            "<xref target='Part5' x:rel='#header.if-range' xmlns:x='http://purl.org/net/xml2rfc/ext'/>">
@@ -958 +959 @@
    a sender &SHOULD-NOT; generate representation metadata other
    than the above listed fields unless said metadata exists for the
-   purpose of guiding cache updates (e.g., future HTTP extensions).
-</t>
-<t>
-   If the recipient of a 304 response does not have a cached representation
-   corresponding to the entity-tag indicated by the 304 response, then the
-   recipient &MUST-NOT; use the 304 to update its own cache.  If this
-   conditional request originated with an outbound client, such as a user agent
-   with its own cache sending a conditional GET to a shared proxy, then the 304
-   response &MAY; be forwarded to that client.  Otherwise, the recipient &MUST;
-   disregard the 304 response and repeat the request without any preconditions.
-</t>
-<t>
-   If a cache uses a received 304 response to update a cache entry, the
-   cache &MUST; update the entry to reflect any new field values given in
-   the response.
+   purpose of guiding cache updates (e.g., <x:ref>Last-Modified</x:ref> might
+   be useful if the response does not have an <x:ref>ETag</x:ref> field).
+</t>
+<t>
+   Requirements on a cache that receives a 304 response are defined in
+   &freshening-responses;. If the conditional request originated with an
+   outbound client, such as a user agent with its own cache sending a
+   conditional GET to a shared proxy, then the proxy &SHOULD; forward the
+   304 response to that client.
 </t>
 </section>