Go WebSocket development and testing practice [/ net/websocket]

After learning the basics of HTTP, I naturally came to the WebSocket protocol. Just two days ago, I practiced it again in order to compare the performance of WebSocket scripts in Java and Go. I feel that I can do it. I specially wrote an article to record it.

First, review the Java and Python test articles on Socket, WebSocket and Socket.IO.

Let's share the development and testing of WebSocket interface with Go language.

rely on

This article uses the / net/websocket library and another / gorilla/websocket. I'll write an article and share it after I'm fully proficient. The biggest advantage of Go language library is that the same library can not only do interface development, but also send requests as clients.

WebSocket development

There is a big pit in this place. Many materials found on the Internet are outdated and actually can't run. The reason is that / net/websocket is relatively less used for server development. A wrong article was copied around the whole network, which greatly affected the experience of self-study Xiaobai.

Here, the function of the server is simple, and the function design is as follows: after receiving the client message, the returned message is the current time.

// Echo
// @Description:WebSocket interface handle
// @param ws
func Echo(ws *websocket.Conn) {
 var err error
 for {
  var reply string
  if err = websocket.Message.Receive(ws, &reply); err != nil {
   fmt.Println("receive failed:", err)
  log.Printf("Received message:%s", reply)
  msg := string(time.Now().String())
  websocket.Message.Send(ws, msg)

// TestSer
// @Description: create a WebSocket interface
// @param t
func TestSer(t *testing.T) {
 //Accept the routing address of websocket
 http.HandleFunc("/websocket", func(w http.ResponseWriter, req *http.Request) {
  s := websocket.Server{Handler: websocket.Handler(Echo)}
  s.ServeHTTP(w, req)
 if err := http.ListenAndServe(":1234", nil); err != nil {

  log.Fatal("ListenAndServe:", err)


The big hole here is that you need to convert the handle of WebSocket into the handle of HTTP. I personally understand that it is equivalent to the process of upgrader.


Here, you simply send a message to the server and print the message returned by the server. Because the logic of the server is simple, the client is also very simple. If you need to test WebSocket in combination with chan in the actual test, it is very easy to use.

// TestWebSocket
// @Description: Test WebSocket script
// @param t
func TestWebSocket(t *testing.T) {

 url := "wss://wspri.coinall.ltd:8443/ws/v5/public"
 c, res, err := websocket.DefaultDialer.Dial(url, nil)
 if err != nil {
  log.Fatal("connection failed:", err)
 log.Printf("response:%s", fmt.Sprint(res))
 defer c.Close()
 done := make(chan struct{})
 err = c.WriteMessage(websocket.TextMessage, []byte("Hello,I am FunTester"))
 if err != nil {
 go func() {
  defer close(done)
  for {
   _, message, err := c.ReadMessage()
   if err != nil {
   log.Printf("Received message: %s", message)

 s := <-done



First start the server, and then start the client. The startup speed of Go language is much faster than that of Java, with obvious advantages.

I also wrote a Java test client:

package com.funtest.javatest;

import com.funtester.frame.SourceCode;
import com.funtester.socket.WebSocketFunClient;

public class WebSocketT extends SourceCode {

    public static void main(String[] args) {
        WebSocketFunClient instance = WebSocketFunClient.getInstance("ws://localhost:1234/websocket");
        instance.send("Hello,I am FunTester - Java ,Have Fun ~ Tester !");

Server log:

=== RUN   TestSer
2021/11/09 18:03:20 Received message:Hello,I am FunTester - Go ,Have Fun ~ Tester !
2021/11/09 18:05:49 Received message:Hello,I am FunTester - Java ,Have Fun ~ Tester !

Go client log:

=== RUN   TestMn2
2021-11-09 18:03:20.570277 +0800 CST m=+11.854257683

Java client log:

INFO-> main Current user: oker´╝îWorking directory:/Users/oker/IdeaProjects/funtester/,System coding format:UTF-8,system Mac OS X edition:10.16
INFO-> main FunTester_0 Start connection...
INFO-> WebSocketConnectReadThread-14 FunTester_0 Building socket connect...
INFO-> WebSocketConnectReadThread-14 Handshake information key: Connection ,value: Upgrade
INFO-> WebSocketConnectReadThread-14 Handshake information key: Sec-WebSocket-Accept ,value: mpWx5ntxvsNp75f8ubGZPmjSrn0=
INFO-> WebSocketConnectReadThread-14 Handshake information key: Upgrade ,value: websocket
INFO-> main FunTester_0 Connection succeeded!
INFO-> WebSocketConnectReadThread-14 FunTester_0 received: 2021-11-09 18:05:49.374599 +0800 CST m=+43.517144103

Posted on Fri, 12 Nov 2021 10:59:03 -0500 by maxpouliot