Two New HTTP Caching Extensions

Ricardo Newbery ric at
Wed Apr 9 01:18:46 CEST 2008

On Apr 7, 2008, at 3:18 PM, Jon Drukman wrote:

> 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.
> -jsd-

+1 on stale-while-revalidate.  I found this one to be real handy.


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