code: func RealNetIP() string {
  	addrs, err := net.InterfaceAddrs()
  
  	if err != nil {
  		fmt.Println(err)
  		return ""
  	}
  
  	// get real local IP
  	for _, address := range addrs {
  		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
  			if ipnet.IP.To4() != nil {
  				return ipnet.IP.String()
  			}
  
  		}
  	}
  	return ""
  }
docs: // RealNetIP returns the real local IP of the system or an empty string.