Conditional GET (was Re: caching using ETags to vary the content)

Miles miles at
Tue Nov 4 23:19:34 CET 2008

Ryan Tomayko wrote:
> On 11/4/08 12:51 PM, Miles wrote:
>> I know varnish doesn't do If-None-Match, but I don't think that is a
>> problem in this scheme.
> I'm curious to understand why Varnish doesn't do validation / conditional GET.
> Has If-Modified-Since/If-None-Match support been considered and rejected on
> merit or is it something that could theoretically be accepted into the
> project? Has it just not received any real interest?
> Personally, I'd love to see support for conditional GET as this can
> significantly reduce backend resource use when the backend generates cache
> validators upfront and 304's without generating the full response.
> Ryan

AFAIK varnish does do if-modified-since, just not if-none-match


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