A complete, structured guide to WebSocket — from protocol internals to production-ready patterns. All 9 chapters with real code.
| # | Chapter | Topics |
|---|---|---|
| 1 | 🔬 Protocol Deep Dive | RFC 6455, frames, opcodes, handshake |
| 2 | 🖥️ Server Setup | ws library, Express integration |
| 3 | 📢 Broadcasting | Broadcast, unicast, exclude patterns |
| 4 | 🏠 Rooms | Map/Set architecture, room lifecycle |
| 5 | 🔄 Reconnection Logic | Exponential backoff, jitter, retries |
| 6 | 💓 Heartbeat / Ping-Pong | Ping-pong, zombie detection |
| 7 | ⚖️ WS vs SSE vs Polling | When to use what, decision guide |
| 8 | 🔐 Security | TLS, JWT auth, CSRF, rate limiting |
| 9 | 🚀 Socket.io | Rooms, namespaces, acknowledgements |
Tip: Each chapter contains full working code you can copy directly into your project.
Chapter 1 — 🔬 Protocol Deep Dive
Chapter 5 — 🔄 Reconnection Logic
Chapter 6 — 💓 Heartbeat / Ping-Pong
Chapter 7 — ⚖️ WebSocket vs SSE vs Long Polling
[Chapter 9 — 🚀 Socket.io](https://modern-scene-e93.notion.site/Chapter-9-Socket-io-321f293c847e81acbbffcfd3c8d6ca26)