How to use API Gateway with serverless functions

· Category: Cloud Computing

Short answer

API Gateway acts as a front door for your serverless functions, handling routing, throttling, and authentication.

Steps

  1. Create an API in API Gateway (REST, HTTP, or WebSocket).
  2. Define resources and methods (GET, POST).
  3. Integrate with a Lambda function or HTTP endpoint.
  4. Deploy to a stage (dev, prod).
  5. Configure throttling, caching, and usage plans.

Tips

  • Use Lambda proxy integration for full request/response control.
  • Enable CloudWatch logging for debugging.
  • Custom authorizers (Lambda or Cognito) secure endpoints.

Common issues

  • 504 Gateway Timeout: increase Lambda timeout or optimize code.
  • Cold starts plus API Gateway latency can affect user experience.