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This example will show how to work with websockets in Go. We will build a simple server which echoes back everything we send to it. For this we have to go get the popular gorilla/websocket library like so:

$ go get github.com/gorilla/websocket

From now on, every application we write will be able to make use of this library.

// websockets.go
package main

import (


var upgrader = websocket.Upgrader{
    ReadBufferSize:  1024,
    WriteBufferSize: 1024,

func main() {
    http.HandleFunc("/echo", func(w http.ResponseWriter, r *http.Request) {
        conn, _ := upgrader.Upgrade(w, r, nil) // error ignored for sake of simplicity

        for {
            // Read message from browser
            msgType, msg, err := conn.ReadMessage()
            if err != nil {

            // Print the message to the console
            fmt.Printf("%s sent: %s\n", conn.RemoteAddr(), string(msg))

            // Write message back to browser
            if err = conn.WriteMessage(msgType, msg); err != nil {

    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        http.ServeFile(w, r, "websockets.html")

    http.ListenAndServe(":8080", nil)
<!-- websockets.html -->
<input id="input" type="text" />
<button onclick="send()">Send</button>
<pre id="output"></pre>
    var input = document.getElementById("input");
    var output = document.getElementById("output");
    var socket = new WebSocket("ws://localhost:8080/echo");

    socket.onopen = function () {
        output.innerHTML += "Status: Connected\n";

    socket.onmessage = function (e) {
        output.innerHTML += "Server: " + e.data + "\n";

    function send() {
        input.value = "";
$ go run websockets.go
[]:53403 sent: Hello Go Web Examples, you're doing great!
Status: Connected
Server: Hello Go Web Examples, you're doing great!