in internal/version/version.go [390:402]
func versionArchiveURL(version string) string {
goos := getOS()
ext := ".tar.gz"
if goos == "windows" {
ext = ".zip"
}
arch := runtime.GOARCH
if goos == "linux" && runtime.GOARCH == "arm" {
arch = "armv6l"
}
return "https://dl.google.com/go/" + version + "." + goos + "-" + arch + ext
}