Apache can do just about everything with a bit of configuration. I have used HTTP proxying on a number of occasions to make content from one site appear to come from another site. This can be very handy for sites I host at home where I only have one IP address but two servers and want to host different web sites on the same public IP – and all of them on the standard HTTP port.
However, until recently I hadn’t experienced that Apache can also rewrite the content in the actual response. I was faced with the requirement to change all the URIs in the proxied web site so that they pointed to the new URL. When I first searched the net I found the module mod_proxy_html which sounded like the way forward. In the end I didn’t go that route since I found it overly complex and didn’t transform all instances of the links. Instead, the solution was simple and used another Apache module – mod_substitute.
The following virtual host configuration sets up a proxy so that the site www.one.com is proxied to www.two.com. In addition, any occurrences of www.one.com is changed into www.two.com:
ProxyPass / http://www.one.com/
ProxyPassReverse / http://www.one.com/
AddOutputFilterByType SUBSTITUTE text/html