Pointing a folder in Apache to another server on the network

How do I point Apache on one server to link to another server. Like if I wanted /folder on 10.0.0.10 which is the main server to have /folder point to another web server on the network 10.0.0.20. How can I do this so it appears seamless over the internet. I have tried editing default in sites-available and using Redirect but I'm not sure if it'll work over the internet.