Re: Can you cache the unknown? (was Re: Session-ID proposal)

Roy Fielding (
Fri, 25 Aug 1995 14:58:09 -0400

>I don't understand why a cache "must" do this... Can you explain why this is

Any unknown header is treated as an Entity-Header, and a proxy must cache
entity headers if it intends to forward them to future clients.

>I would prefer if caches would not cache objects that contained unknown
>headers under any conditions. If this can't be the case, can we at least
>have a requirement that caches must not cache responses that carry protocol
>versions whose defined elements aren't understood by the cache.

That is unneccessary if the recipient compares the received headers
to the received HTTP-Version.

....Roy T. Fielding Department of ICS, University of California, Irvine USA
Visiting Scholar, MIT/LCS + World-Wide Web Consortium
( (