TCP connectivity test in golang

connTest.go

package main

import (
	"fmt"
	"net"
	"time"
)

func main() {
	host := "baidu.com"
	port := "443"
	if result, err := raw_connect(host, port); result {
		fmt.Println("Opened", net.JoinHostPort(host, port))
	} else {
		fmt.Println("Connecting error:", err)
	}
}

func raw_connect(host string, port string) (bool, error) {
	result := false
	timeout := time.Second
	conn, err := net.DialTimeout("tcp", net.JoinHostPort(host, port), timeout)
	if err == nil {
		result = true
	}
	if conn != nil {
		defer conn.Close()
	}
	return result, err
}