WebSocket

Full-duplex communication channel between browser and server. Establish a connection once, both sides can send data anytime — no need to re-initiate requests each time.

Module Contents

• Overview — What is WebSocket, how it differs from HTTP
• Core Concepts — URL format, subprotocols, heartbeat mechanism
• Basic Usage — Connect, send, receive, close
• Advanced Usage — Reconnect, disconnect detection, binary data, subprotocols
• Practical: Real-time Chat — Build a multi-user real-time chat app from scratch