Two New HTTP Caching Extensions

Jon Drukman jsd at
Tue Apr 8 00:18:22 CEST 2008

Poul-Henning Kamp wrote:
> In message <4232A186-6F90-4713-8723-0925E4BD286A at>, Sam Quigley writ
> es:
>> ...just thought I'd point out another seemingly-nifty thing the Squid  
>> folks are working on:
>> and
> Interesting to see what hoops they try to jump through these days...

I just got through working at Yahoo and they have valid reasons to want 
all these behaviors.  The thing I didn't like about the cache channel 
implementation is it involves squid polling an RSS feed every few 
seconds to determine which bits of the cache to invalidate.

I'm looking at launching a small site for a client and the 
stale-while-revalidate/stale-on-error functionality is fairly critical. 
  I want to go with varnish, though. Front end cache server in India, 
pulling content from the USA... lots of potential for slow/dead 
connections back to the origin, so it would be great if Varnish would 
serve stale content in this eventuality.


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