websocket/web.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>WebSocket API</title>
</head>
<body>
    <script>
        const URL = 'ws://localhost:8080';
        const socket = new WebSocket(URL);
        socket.addEventListener('open', ev => {
            console.log(`Connected successfully to ${URL}`);
            socket.send('Hello from the website!')
        })
        socket.addEventListener('message', ev => {
            console.log(`recv: ${ev.data}`);
            console.log('Closing...');
            socket.close();
        })
        socket.addEventListener('close', ev => {
            console.log(`Connection closed`, ev);
        })
        socket.addEventListener('error', err => {
            console.error(`Error: ${err}`);
        })
    </script>
</body>
</html>