Changeset 1390 for draft-ietf-httpbis/latest/p6-cache.xml

Timestamp:

08/08/11 19:37:45 (10 years ago)

Author:

fielding@…

Message:

Be intolerant. Move cache date requirements hiding in appendix to p6.

File:

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

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

@@ -869 +869 @@
   current_age = corrected_initial_age + resident_time;
 </artwork></figure>
+<t>
+   Additional rules for requirements on parsing and encoding of dates
+   and other potential problems with date encodings include:
+</t>
+<t>
+  <list style="symbols">
+     <t>HTTP/1.1 clients and caches &SHOULD; assume that an RFC-850 date
+        which appears to be more than 50 years in the future is in fact
+        in the past (this helps solve the "year 2000" problem).</t>
+
+     <t>Although all date formats are specified to be case-sensitive, 
+        recipients &SHOULD; match day, week and timezone names
+        case-insensitively.</t>
+             
+     <t>An HTTP/1.1 implementation &MAY; internally represent a parsed
+        Expires date as earlier than the proper value, but &MUST-NOT;
+        internally represent a parsed Expires date as later than the
+        proper value.</t>
+
+     <t>All expiration-related calculations &MUST; be done in GMT. The
+        local time zone &MUST-NOT; influence the calculation or comparison
+        of an age or expiration time.</t>
+
+     <t>If an HTTP header field incorrectly carries a date value with a time
+        zone other than GMT, it &MUST; be converted into GMT using the
+        most conservative possible conversion.</t>
+  </list>
+</t>
 </section>