Introduction to WebSockets

WebSockets are a communication protocol that facilitates real-time, bidirectional communication between clients and servers, making them ideal for applications like chat, stock market updates, multiplayer games, and collaborative tools. Unlike HTTP, which is unidirectional and requires repeated request-response cycles, WebSockets maintain a persistent, full-duplex connection, reducing latency and bandwidth usage. The protocol begins with an HTTP handshake to upgrade the connection, after which data can be sent instantly without additional requests. This article demonstrates building a simple chat application using WebSockets with Node.js for the backend and JavaScript for the frontend, highlighting the benefits of real-time data transmission. While the example is suitable for development, deploying WebSocket applications in production requires additional considerations such as authentication and connection management, for which platforms like Upsun can simplify the process by offering features like automatic environment previews, performance monitoring, and handling of infrastructure complexities.