func HasSrc() bool {
	switch runtime.GOOS {
	case "ios":
		return false
	}
	return true
}

// HasExternalNetwork reports whether the current system can use
// external (non-localhost) networks.
func HasExternalNetwork() bool {
	return !testing.Short() && runtime.GOOS != "js" && runtime.GOOS != "wasip1"
}

// MustHaveExternalNetwork checks that the current system can use