golang-test-network.go

package main

import (
	"flag"
	"fmt"
	"net"
)

func main() {
	var network string
	var addr string

	flag.StringVar(&network, "net", "tcp", "network")
	flag.StringVar(&addr, "addr", "www.baidu.com:80", "address to test")
	flag.Parse()

	conn, err := net.Dial(network, addr)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println("connected", addr, "using", network)
	conn.Close()
}