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From "Peter Michaux" <>
Subject Re: [users@httpd] configuring disk cache look-up before proxying
Date Fri, 28 Nov 2008 18:44:50 GMT
Hi Eric,

On Wed, Nov 26, 2008 at 2:44 PM, Eric Covener <> wrote:
> On Wed, Nov 26, 2008 at 4:40 PM, Peter Michaux <> wrote:
>> The back end server caches files in two different places and I would
>> like Apache to look in those two places and only proxy if the cached
>> file cannot be found. For example, a request to
> Insead of ProxyPass, use mod_rewrite to poke around in the filesystem:
> RewriteCond /var/cache/app/%{HTTP_HOST}/%{REQUEST_URI}  -f
> RewriteRule .*  /var/cache/app/%{HTTP_HOST}/%{REQUEST_URI}  [L]
> RewriteCond /var/cache/otherapp/%{HTTP_HOST}/%{REQUEST_URI}  -f
> RewriteRule .*  /var/cache/otherapp/%{HTTP_HOST}/%{REQUEST_URI}  [L]
> # couldn't find the file in either dir
> RewriteRule ^/(.*) http://localhost:3000/$1 [P]
> Or, let Apache cache things instead of writing them to disk, and it
> would be more transparent.
> (Note that you need to put the rewrite stuff in per-vhost context,
> otherwise it won't work as-is. You also probably want to handle
> directories if that makes sense for your app (-d))

Thanks for this. I was able to piece together what I needed with your
above idea and some more documentation reading. It seems the [P] uses
mod_proxy and so ProxyPreserveHost is still honoured with the rewrite
rule to localhost:3000.


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