检测一个端口是否为HTTPS

package main

import (
	"fmt"
	"time"
	"net"
	"strconv"
	"os"
)

func main(){
	t:=[]byte{0x16,0x03,0x01,0x00,0xb5,0x01,0x00,0x00,0xb1,0x03,0x03,0xb2,0xd3,0x4d,0xfd,0x63,0xbe,0x89,0xdb,0xe5,0x46,0xcc,0xaf,0x39,0x6e,0xba,0x63,0x63,0x75,0xce,0x30,0xda,0xe0,0x4f,0xab,0xa2,0x3e,0x50,0xea,0x41,0x20,0x10,0xc4,0x00,0x00,0x18,0xc0,0x2b,0xc0,0x2f,0xc0,0x2c,0xc0,0x30,0xc0,0x13,0xc0,0x14,0x00,0x9c,0x00,0x9d,0x00,0x2f,0x00,0x35,0x00,0x0a,0x00,0xff,0x01,0x00,0x00,0x70,0x00,0x00,0x00,0x15,0x00,0x13,0x00,0x00,0x10,0x77,0x77,0x77,0x2e,0x73,0x6f,0x2d,0x63,0x6f,0x6f,0x6c,0x73,0x2e,0x63,0x6f,0x6d,0x00,0x0b,0x00,0x04,0x03,0x00,0x01,0x02,0x00,0x0a,0x00,0x06,0x00,0x04,0x00,0x17,0x00,0x18,0x00,0x23,0x00,0x00,0x00,0x0d,0x00,0x20,0x00,0x1e,0x06,0x01,0x06,0x02,0x06,0x03,0x05,0x01,0x05,0x02,0x05,0x03,0x04,0x01,0x04,0x02,0x04,0x03,0x03,0x01,0x03,0x02,0x03,0x03,0x02,0x01,0x02,0x02,0x02,0x03,0x00,0x05,0x00,0x05,0x01,0x00,0x00,0x00,0x00,0x00,0x0f,0x00,0x01,0x01,0x00,0x10,0x00,0x0b,0x00,0x09,0x08,0x68,0x74,0x74,0x70,0x2f,0x31,0x2e,0x31}

	Target:="115.239.210.27"
	port:=443
	Time, _ := time.ParseDuration("1s")
	conn, err := net.DialTimeout("tcp", Target+":"+strconv.Itoa(port), Time )

	if err != nil {
		fmt.Println("ERR::" + strconv.Itoa(port) + ">" + err.Error())
		os.Exit(1)
	}
	conn.Write(t)
	recvBuf := make([]byte, 2048)
	conn.SetReadDeadline(time.Now().Add(time.Second * 2))
	_, err = conn.Read(recvBuf[:])
	conn.SetReadDeadline(time.Time{})
	fmt.Println("tlsinfo:")
	fmt.Println( string(recvBuf[:]))
	if string(recvBuf[0:4]) == string([] byte {22,3,3,0}) {
		fmt.Println("this is tls ^_^")
	}else{
		fmt.Println("this is not tls")
	}
	conn.Close()
}

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