Is the proxy on the server side or the client side? If the server side then you don’t need to do anything as long as the proxy is half-decent. If the client side then you just need to setup the client to use the proxy (if not already built into the network stack of the OS you are running on).
Squid works fine, I barely even touched its config when I ran it. There should not need to be anything you do on the server side, not even ruby or node or so. If on the client side, well that depends on what language the client is in, what os, etc…
