證明socket是全雙工，read，write是相互獨立的

package main

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

func main()  {
    listener, _ := net.Listen("tcp","0.0.0.0:5566")
    go func() {
        client, _ := net.Dial("tcp", "127.0.0.1:5566")
        s := "hello"
        client.Write([]byte(s))
        s2 := "world"
        client.Write([]byte(s2))
    }()
    conn, _ := listener.Accept()
    time.Sleep(time.Second * 10)
    var buf [10]byte
    conn.Read(buf[:]) // [104 101 108 108 111 119 111 114 108 100]
    fmt.Println(buf)
    conn.Read(buf[:])
    fmt.Println(buf) // empty
}

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