JavaScript and JSON Essentials - Second Edition

How Socket.IO works

Let's walk through the code line by line. We imported the index.html.js template, which is a simple node module that exports string-based HTML data. Then, we created an HTTP server to handle the HTTP request and response via a web browser or any other client that renders an HTML view.

We created a real-time server by passing an instance of the server to the required Socket.IO library. Socket.IO is the crude library for our real-time app. It provides a wrapper to WebSocket. WebSocket is a protocol that performs a continuous communication handshake over TCP (transmission control protocol).

To put it into simple terms, once the client establishes the connection to the WebSocket server, the client doesn't have to make a specific ...