Hi.
I'm not a specialist of that kind of thing, but I'm curious and I just
wonder about the following kind of scenario :
- In the proxy server, unset the Accept-encoding header, but set another
non-standard one (or an environment value) that will not be recognised
by the back-end server
- condition the SetOutputFilter DEFLATE by this other header/value
- do the proxying. The back-end server will not get the Accept-encoding
header. Instead it will get the new header you set, but will not react
to it, so not do compression.
- but the front-end server still will
I think that mod_sentenvif and/or mod_rewrite should allow you to do the
above. Someone else would have to give you the specifics though.
André
Rainer Sabelka wrote:
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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