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Serverless Backend with AWS Lambda & API Gateway · Lesson

WebSocket APIs for Real-Time Communication

Build two-way, real-time connections with API Gateway WebSocket APIs. Learn the connect, disconnect, and message routes and how to push data back to clients.

Why WebSockets?

REST APIs are request/response — the server cannot push. For chat, live dashboards, or notifications you need a persistent two-way channel. API Gateway WebSocket APIs provide exactly that.

The Three Built-in Routes

A WebSocket API has special routes:

  • $connect when a client connects
  • $disconnect when it leaves
  • $default for unmatched messages

All lessons in this course

  1. Caching and Throttling
  2. Request/Response Transformations
  3. Custom Domain Names & Edge Optimization
  4. WebSocket APIs for Real-Time Communication
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