golang编写检测端口是否为https

package main

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

func (){
  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()
}