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From Mark Nottingham <>
Subject Re: Asynchronous refresh
Date Fri, 28 Jan 2011 00:58:25 GMT

Supported in Squid 2.7.


On 28/01/2011, at 12:15 AM, <> <> wrote:

> ´╗┐Hello,
> is it possible to refresh/revalidate the cache asynchronously?
> That means if a client triggers a refresh of an object stored in the cache, 
> could this request be served (with old data) from the cache and the 
> refresh done in the background?
> Actually I'm not using traffic server but I need to know it traffic server could do this.
> Most caching proxy servers stale the client until data from the backend are retrieved.
> Why I need this:
> The backend could take some time to render the data.
> On a refresh I don't want that a user have to wait that long.
> Workarounds?
> "Common" workarounds like putting two caches in series seems not useful
> because the same problem exists. The middle proxy would stale the frontend 
> proxy.
> Purging and "warming up the cache" using PURGE + GET 
> reguests is really complex and would not be necessary if the async 
> refreshing would be somehow possible.
> Do you know any other caching reverse proxy software that can do that?
> I did not test it but from the docs and IRC it seems Varnish, Ngnix, apache 
> Webser can't do that and do block on refresh. At least I know squid can't do it.
> Thanks in advance,
> Philipp
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Mark Nottingham

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