https://proxy.golang.org/github.com/mwhudson/juju/@v/v0.0.0-20160512215208-90ff01f3497f.zip: Get "https://proxy.golang.org/github.com/mwhudson/juju/@v/v0.0.0-20160512215208-90ff01f3497f.zip": stream error: stream ID 295289; INTERNAL_ERROR; received from peer