2016-02-04 13:32



I have a simple go web server which serves on port localhost:8080 an public folder containing both an html file as well as a client script with websocket logic.

in my main.go file

listener, err := net.listen("tcp", "localhost:8080")
if err != nil {
//full code in gist https://gist.github.com/Kielan/98706aaf5dc0be9d6fbe

then in my client script

try {
    var sock = new WebSocket("ws://");
    console.log("Websocket - status: " + sock.readyState);

    sock.onopen = function(message) {
    console.log("CONNECTION opened..." + this.readyState);
    //onmessage, onerr, onclose, ect...

I get the error in chrome

WebSocket connection to 'ws://' failed: Error during WebSocket handshake: Unexpected response code: 200

and Firefox

Firefox can't establish a connection to the server at ws://

I found this article referring to node.js indicating to add /websocket to my client websocket string, though it did not solve the problem and resulted in a 404

I thought response code 200 is good, do I need to convert the request to a websocket somehow and maybe it is defaulting to http? If so how can I do this?

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  • dongwei6457 dongwei6457 5年前

    Like JimB pointed out, you are not handling http nor websocket connections yet.

    You can do websocket handling with the package github.com/gorilla/websocket This is how a simple setup could look like:

    package main
    import (    
    // wsHandler implements the Handler Interface
    type wsHandler struct{}
    func main() {
        router := http.NewServeMux()
        router.Handle("/", http.FileServer(http.Dir("./webroot"))) //handles static html / css etc. under ./webroot
        router.Handle("/ws", wsHandler{}) //handels websocket connections
        log.Fatal(http.ListenAndServe("localhost:8080", router))
    func (wsh wsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
        // upgrader is needed to upgrade the HTTP Connection to a websocket Connection
            upgrader := &websocket.Upgrader{
                ReadBufferSize:  1024,
                WriteBufferSize: 1024,
            //Upgrading HTTP Connection to websocket connection
            wsConn, err := upgrader.Upgrade(w, r, nil)
            if err != nil {
                log.Printf("error upgrading %s", err)
            //handle your websockets with wsConn

    In your Javascript you then need var sock = new WebSocket("ws://localhost/ws:8080"); obviously.

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