【请教】socket客户端conn.Write()发送的内容末尾加上\n就能得到server端回应，否则超时，请帮忙看看是客户端还是server端问题，先谢谢了

客户端建立连接： conn, err := net.DialTimeout("tcp", destIPPort, 3*time.Second) if err != nil { Log(LL_INFO, "tcp connect error bef process log file, please check it.") return err } defer func() { if nil != conn { conn.Close() } }() 客户端发送和接收： scanner := bufio.NewScanner(file) for scanner.Scan() { line := scanner.Text() index := strings.Index(line, "=") index = index + 1 req := line[index:] //req = req + "\n" //4post reqSent := []byte(req) numSent, err := conn.Write(reqSent) ... //对err和numSent的异常处理 conn.SetReadDeadline(time.Now().Add(3 * time.Second)) numRecv, err := conn.Read(buff) if err != nil || numRecv < 0 { if err == io.EOF || err == syscall.EINVAL { Log(LL_INFO, "tcp connect is already closed.") return err } if 0 == numRecv { if nil != conn { conn.Close() } Log(LL_INFO,"4_post_log, err and numRecv: ", err, " . numRecv: ", numRecv) conn, err = net.DialTimeout("tcp", destIPPort, 6*time.Second) if err != nil { Log(LL_INFO, "tcp connect error:", err, ", please check it.") return err } }else{ Log(LL_INFO, "tcp receive data error:", err, ", please check it.") return err } } Log(LL_INFO, "recv data:", string(buff[0:numRecv])) } server对端处理连接代码（echo发送收到的内容回去给客户端）： func handleConn(c net.Conn) { input := bufio.NewScanner(c) for input.Scan() { lineRecv := input.Text() fmt.Println(lineRecv) fmt.Fprintln(c, lineRecv) } c.Close() } 如果我把“req = req + "\n"”这行注释掉，不加\n在末尾，则报错： 2017-09-26 13:36:03 <LL_INFO> 4_post_log, err and numRecv: read tcp 127.0.0.1:51863->127.0.0.1:12345: i/o timeout . numRecv: 0 如果在末尾加上“\n"，则能收到server端echo回来的数据（如下是日志）： 2017-09-26 13:53:12 <LL_INFO> Data sent:hnd {1} Total sent 8bytes. 2017-09-26 13:53:12 <LL_INFO> Data sent finished, begin to recv... 2017-09-26 13:53:12 <LL_INFO> recv data:hnd {1}