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From Axel-Stéphane SMORGRAV <Axel-Stephane.SMORG...@europe.adp.com>
Subject RE: [users@httpd] mod_cache and conditional disabling
Date Thu, 25 Aug 2005 11:56:07 GMT

OK What about this, at the expense of an additional GET :

<VirtualHost www.foo.bar>
   RewriteCond %{HTTP_COOKIE}	MYCOOKIE
   RewriteRule ^(.*)$ http://cache.foo.bar$1 [P]

   ProxyPassReverse  / http://cache.foo.bar/

   ProxyPass / http://backend.foo.bar/ 
   ProxyPassReverse  / http://backend.foo.bar/
</VirtualHost>

<VirtualHost cache.foo.bar>
   ProxyPass / http://backend.foo.bar/ 
   ProxyPassReverse  / http://backend.foo.bar/

   CacheEnable /
</VirtualHost>
 

-----Original Message-----
From: Colm MacCarthaigh [mailto:colm@stdlib.net] 
Sent: Thursday, August 25, 2005 10:35 AM
To: users@httpd.apache.org
Subject: Re: [users@httpd] mod_cache and conditional disabling

On Thu, Aug 25, 2005 at 10:30:19AM +0200, Axel-Stéphane  SMORGRAV wrote:
> It is possible by doing a bit of rewriting and tweaking of URLs.
> 
> Here's the general idea:
> 
> RewriteCond %{HTTP_COOKIE}	MYCOOKIE
> RewriteRule ^(.*)$ /DONTCACHE$1
> 
> ProxyPass /DONTCACHE http://backend.foo.bar/ ProxyPassReverse  
> /DONTCACHE http://backend.foo.bar/
> 
> CacheDisable /DONTCACHE
> 
> or something like that.

I don't think that will work reliably. Although it will prevent requests with the cookie set
from being cached, it will not prevent responses for non-cookie users being served to cookie
users. This is because mod_cache runs as a quick-handler, before mod_rewrite has had a chance
to run.

-- 
Colm MacCárthaigh                        Public Key: colm+pgp@stdlib.net

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