Overriding a JS file from server from proxy

Question

I have an Apache reverse-proxy server set up between a client machine and a server. What I want to achieve is to override a javascript file sent from the server with the one from the proxy before sending the file to the client. I don't want to change the javascript file at the server because I want the proxy to be transparent. Is there a possible way to do this?

Answer 1

Assuming you're using a the ProxyPass Apache directive you can exclude certain sub directories and file system paths from being forwarded by using an exclamation mark !. That will allow you to serve them from the local file system on the proxy server instead.

 # Exclude file.js and serve that from the local filesystem
 ProxyPass /app/dir/file.js !
 # proxy /app to internal server
 ProxyPass /app http://int.example.com/app
 ProxyPassReverse /app http://int.example.com/app