Warning: You are using macOS 10.12.
We (and Apple) do not provide support for this old version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew’s GitHub,
Discourse, Twitter or IRC. You are responsible for resolving any issues you
experience while you are running this old version.
==> Downloading https://dl.google.com/go/go1.13.5.src.tar.gz
Already downloaded: /Users/pandong/Library/Caches/Homebrew/downloads/702da802ab85b015c391ed1b3f565f1c11a0d563d3c9e17faabb4786665e6f8b–go1.13.5.src.tar.gz
==> Downloading https://storage.googleapis.com/golang/go1.7.darwin-amd64.tar.gz
curl: (7) Failed to connect to storage.googleapis.com port 443: Operation timed out
Error: An exception occurred within a child process:
DownloadError: Failed to download resource “go–gobootstrap”
Download failed: https://storage.googleapis.com/golang/go1.7.darwin-amd64.tar.gz