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Date: Wed, 25 Aug 2004 21:24:11 -0400 (EDT)
From: "Matthew Pitts" <invinity@nvinity.net>
To: "Apache users mailing list " <users@httpd.apache.org>
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Subject: [users@httpd] mod_rewrite proxy with dynamic ProxyPassReverse

Hey all,

I have been searching for a solution to my problem and I found a lot of
sites that came close, but I have not been able to nail this one down.

I have been writing a Perl module to manage Apache2 processes, each of
which obviously runs on a different port. There is a main Apache process
that listens on port 80, which proxies requests to the appropriate server
on another port using a mod_rewrite RewriteMap. The following code shows
the mod_rewrite configuration for the server running on port 80:

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteLog logs/mod_rewrite-log
    RewriteMap aivh    prg:/usr/bin/aivh_rewriter
    RewriteRule ^proxy:.*  -  [F]
    RewriteRule ^(.*)$  http://${aivh:%{HTTP_HOST}}$1 [P]
</IfModule>

The program /usr/bin/aivh_rewriter accepts the HTTP_HOST, does a lookup,
and returns a fully qualified domain name with a port number appended. For
instance, if the script were passed an HTTP_HOST of 'www.somedomain.com',
it might return 'www.somedomain.com:9000'.

This provides the proper proxing of the client request, but it doesn't
provide the functionality of ProxyPassReverse when the backend server
sends a redirect. Unfortunately, there are too many hosts right now to
justify individual declarations of ProxyPassReverse. I thought about using
a <Perl> section to dynamically configure ProxyPass and ProxyPassReverse
based on the RewriteMap program, but that would require a server restart
every time a new host was added. Essentially, if mod_rewrite had another
flag, say 'PR', that implemented the functionality of ProxyPassReverse, I
would be golden. Is there a way to provide the same functionality as
ProxyPassReverse, but in a dynamic, per-request lookup fashion as with the
mod_rewrite RewriteMap?

I thank you in advance for your help.

Matt Pitts
invinity@nvinity.net

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