This is great and I think for any company/individual who is going to ensure their domain is registered and maintained this makes a lot of sense. It would be catastrophic, but there is no reason Github couldn't disappear or otherwise change some policies that require moving away from it. The way Go works makes committing these package names tied to Github so much more weighty than simply the place you pull from.

The one thing that I was worried about was returning 301 in the example Nginx config. If you ever wanted to change the url that clients are redirected to then any browsers that visited the old url config would be forced to go to the old config's redirect url. For `go ...` and `curl` it wouldn't matter, but Chrome/Firefox will cache that 301 permanently and break the intended redirect. Not sure if this is really an issue in practice though.