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From Axel-Stéphane SMORGRAV <>
Subject RE: [users@httpd] Apache reverse and caching proxy
Date Thu, 12 Jan 2006 14:36:42 GMT
How does this work for you: it depends on what you want.

If you want certain URLs to be revalidated with every request, you should follow Joshua's
advice and make sure that those resources are served with Cache-Control: must-revalidate.
If the source server is an Apache and the resources are static files, you can probably use
mod_headers (Header set or Header append) to achieve this. The downside of this strategy is
that it makes caching the resource on the reverse proxy more or less pointless.

If you can accept a certain delay between the time where the source is updated and the update
becomes effective for the client, playing with CacheDefaultExpires may get you there. The
RP cache will be revalidated every time the cache entry becomes stale, and you can determine
the interval using CacheDefaultExpires. That will reduce the number of requests that need
to be forwarded all the way to the source.



From: [] 
Sent: Thursday, January 12, 2006 3:27 PM
Subject: RE: [users@httpd] Apache reverse and caching proxy

Hello Axel-Stéphane, 

If I can follow what you are trying to tell me, I should add the "expiresactive on" directive
on the source server instead of the caching server? 

Axel-Stéphane  SMORGRAV <> 

12/01/2006 15:12 
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