In this recipe, we are going to update the handleRequest method in the program to write data back to the client. Perform the following steps:

1. Create tcp-server-write-data.go and copy the following content:

package main
import 
(
  "bufio"
  "fmt"
  "log"
  "net"
)
const 
(
  CONN_HOST = "localhost"
  CONN_PORT = "8080"
  CONN_TYPE = "tcp"
)
func main() 
{
  listener, err := net.Listen(CONN_TYPE, CONN_HOST+":"+CONN_PORT)
  if err != nil 
  {
    log.Fatal("Error starting tcp server : ", err)
  }
  defer listener.Close()
  log.Println("Listening on " + CONN_HOST + ":" + CONN_PORT)
  for 
  {
    conn, err := listener.Accept()
    if err != nil 
    {
      log.Fatal("Error accepting: ", err.Error())
    }
    go handleRequest(conn)
  }
}
func handleRequest(conn net.Conn) 
{
  message, err := bufio.NewReader(conn).ReadString('
')
  if err != nil 
  {
    fmt.Println("Error reading: ", err.Error())
  }
  fmt.Print("Message Received:", string(message))
  conn.Write([]byte(message + "
"))
  conn.Close()
}

2. Run the program with the following command:

$ go run tcp-server-write-data.go