TCP server

Context

For low‑level network protocols, use the net package to create TCP servers and clients.

Example

A TCP echo server.

Code example

package main

import (
    "bufio"
    "fmt"
    "net"
)

func handle(conn net.Conn) {
    defer conn.Close()
    scanner := bufio.NewScanner(conn)
    for scanner.Scan() {
        fmt.Fprintln(conn, "echo:", scanner.Text())
    }
}

func main() {
    ln, err := net.Listen("tcp", ":8080")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer ln.Close()
    for {
        conn, err := ln.Accept()
        if err != nil {
            continue
        }
        go handle(conn)
    }
}

Output (telnet localhost 8080)

hello
echo: hello

Useful links

• net package
• Go by Example: TCP Server