Hi,

I try to use apache (version 2.2.8 on Ubuntu 8.04) for compression offloading.
What I want to do:
- use mod_proxy to forward all requests to the application server
- use mod_deflate to compress the output
- remove the "Accept-Encondig:" header from the client's request before
sending it to the application server to avoid that the compression is done
there.

My frist approach didn't work:

<VirtualHost *:80>
  ServerName www.example.com
  <Proxy *>
     Order deny,allow
     Allow from all
  </Proxy>
  ProxyRequests Off
  ProxyPass / http://realserver:80/
  ProxyPreserveHost on
  RequestHeader unset Accept-Encoding
  SetOutputFilter DEFLATE
</VirtualHost>

The problem with this approach: when I use "RequestHeader unset Accept-
Encoding" then the application server gives me uncompressed output (good) but
also mod_deflate won't comress the output (bad).

So, this is my second approch, which actually works, but I think is a bit an
over-kill:

<VirtualHost *:80>
  ServerName www.example.com
  <Proxy *>
     Order deny,allow
     Allow from all
  </Proxy>
  ProxyRequests Off
  ProxyPass / http://localhost:8000/
  ProxyPreserveHost on
  RequestHeader unset Accept-Encoding
  SetOutputFilter DEFLATE
</VirtualHost>

<VirtualHost localhost:8000>
  ServerName www.example.com
  <Proxy *>
     Order deny,allow
     Allow from all
  </Proxy>
  ProxyRequests Off
  ProxyPass / http://realserver:80/
  ProxyPreserveHost on
  RequestHeader unset Accept-Encoding
</VirtualHost>

Here I have 2 instances of apache in proxy-mode connected in series. The first
one forwards the request to the second one and does the compression of the
output. The second instance just removes the Accept-Encoding header before it
forwards the request to the application server.

But I think there must be a an easier solution. Has any body an idea how to
get this working with only a single instance of apache?

Thanks,
-Rainer

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