Part 1: The Problem Space
Why HTTP isn't enough for real-time
WebSocket lifecycle deep-dive
Common misconceptions addressed
Part 2: Production-Grade PoC
A full-featured real-time system with:
✅ Connection management & heartbeats
✅ Message routing & acknowledgment
✅ Room-based pub/sub pattern
✅ Graceful reconnection strategies
✅ Rate limiting & abuse prevention
✅ Structured logging & metrics
Part 3: The Hard Stuff (What Tutorials Skip)
Memory leak prevention patterns
Horizontal scaling strategies (Redis适配)
Debugging & observability
Security hardening (WSS, validation, sanitization)
Part 4: Code Deep-Dive
Modular architecture (not one giant file!)
Type-safe implementations
Error handling that actually helps
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