Redirecting Firefox to a Proxy on Localhost

Question

For class, I have to write a basic proxy server in C.

I need to test it with firefox, and I'm not sure how to do that.

Say I have the server listening on port X-- how do I make firefox (on the same computer) send its requests there?

Answer 1

To enable sending localhost traffic to a proxy in recent versions of Firefox, open about:config, search for "localhost", and set network.proxy.allow_hijacking_localhost to true.

This is in Firefox 71, and apparently was added around 67. Ran into it while trying to use Fiddler.