[Http-crcsync] General comments on crcsync document

[Alex Wulms]

Op donderdag 9 juli 2009, schreef Patrick McManus:
> On Thu, 2009-07-09 at 21:48 +0200, Alex Wulms wrote:
> > Hi,
> >
> > Regarding caching: I'll read-up on the vary part again. Does it work for
> > a combination of request and response? The important point being that the
> > response is only valid for a request with the matching block-headers.
>
> yes.. it does exactly that.
>
> "Vary: If-Block" means that the response varies based on the value of
> the request header If-Block (which in turn limits cachability of that
> response to other requests with the same if-block header).
>
> I've seen caching proxies that basically say "whoa, too complicated" and
> treat that as meaning "Cache-Control: no-cache", but they don't all do
> that and it leaves room for good implementations. And in the case of
> deltas it is not hard to imagine cache hits in such a scenario.
Excellent. This will certainly simplify the protocol, assuming we can indeed 
ignore issues about the rare but maybe still existing HTTP 1.0 proxies/caches 
that don't know about the vary header.