How did you interact with the Spring Controller during testing?

The WebSocket protocol is used to establish a persistent, two-way connection between a client and a server in web applications. This allows real-time data exchange without the need for repeated HTTP requests. For example, WebSocket is often used in chat applications, online games, and notification systems.

Example of using WebSocket in Node.js:

const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', ws => {
  ws.on('message', message => {
    console.log(`Received: ${message}`);
    ws.send(`Echo: ${message}`);
  });
  ws.send('Welcome to WebSocket server!');
});