WIP: HTTP proxy authentication
This implements HTTP proxy authentication. Unfortunately, it didn't help me, since the proxy I needed it for uses SPNEGO or NTLM authentication, which isn't really supported by urllib3
— or Mercurial itself, for that matter. I wasn't sure how to test it either, so I have yet to try it out successfully.
So, I've labeled this a proposal, for now.
Edited by Dan Villiom Podlaski Christiansen