Yeoman Doctor is hanging at the http(s) proxy

[Carracer66]

I have my proxies identified in .npmrc. NPM and Yarn have no problems getting through the proxy, but Yo Doctor says "Upstream proxy port required" and/or just hangs before failing. yo --version says 3.1.0 and I have seen posts that say this is fixed, but I still have the problem. Is there a way to get around this?

[meteorlxy]

Any updates?

[JoshuaKGoldberg]

This isn't strictly a duplicate of #73, but it looks behaviorally similar to me. There's something funky going on at the Node.js/npm/OS level around proxies that is tripping yeoman-doctor up.

@Carracer66 @meteorlxy is this still something you're seeing? If so, could you please post an isolated reproduction / set of steps? I can't reproduce anything like it. Thanks! 🎩