func IsNetPort(str string) bool {
	if _, err := strconv.ParseUint(
		str, 10, 16); err != nil {
		return false
	}
	return true
}
func IsNetPort(str string) bool {
	if _, err := strconv.ParseUint(
		str, 10, 16); err != nil {
		return false
	}
	return true
}
// IsNetPort checks if this is a valid net port