Mod_proxy in Ubuntu

1. Install reverse_proxy module

sudo apt-get install libapache2-mod-proxy-html

2. Install libxml if it is not already installed.

sudo apt-get install libxml2-dev

3. Load the modules in apache2.conf file

LoadModule? proxy_module???????? /usr/lib/apache2/modules/mod_proxy.so
LoadModule? proxy_http_module??? /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule? headers_module?????? /usr/lib/apache2/modules/mod_headers.so
LoadModule? deflate_module?????? /usr/lib/apache2/modules/mod_deflate.so
LoadFile??? /usr/lib/libxml2.so

4. Say you want to forward all requests starting with /foo to http://moo.com then add the following to your apache2.conf file

ProxyPass /foo/? http://moo.com/

5. Edit file? /etc/apache2/mods-available/proxy.conf and set the proxy to allow from all

Source :

http://abhirama.wordpress.com/2008/11/03/apache-mod_proxy-in-ubuntu/
http://ubuntuforums.org/showthread.php?t=313511