Real-time WebSocket Patterns Build reliable real-time features with WebSockets, SSE, and proper connection management. Protocol Selection | Technology | Direction | Use Case | Complexity | |-----------|-----------|----------|------------| | WebSocket | Bidirectional | Chat, collaboration, gaming | High | | SSE | Server → Client | Notifications, dashboards, feeds | Low | | Long Polling | Request/Response | Fallback, simple updates | Low | | WebTransport | Bidirectional | Low-latency, unreliable OK | Very High | Decision Matrix WebSocket Server (FastAPI) Basic Setup Authentication Message Proto…