Comment 7 for bug 1753340

We use authenticated proxies because only *some* of the builds on our build farm are allowed to talk to the internet at large, and there's nothing to distinguish between them in terms of their network environment; they have to be provided with credentials.

I agree that you should not be required to customise your snapcraft.yaml. I think it's fairly probable that my local-snap-proxy branch will make this much simpler, and possibly you won't need to do anything else at all after that.

I already told you the proxy environment variable names; see comment #4.