How do I configure Emacs behind an authenticated HTTP proxy?

Question

There\'s another question that answers this though it doesn\'t specify anything regarding proxy authentication.

Its solution is

(setq url-proxy-services          


        

Answer 1

In case anyone else hits what I've just struggled with:

If you use cntlm or some other local authenticating proxy, you may need to specify a loopback IP address rather than "localhost". I found "localhost" silently failed, but "127.0.0.1" worked a treat.