API Gateway Is More Than a Simple Proxy
Many developers use API Gateway as a pass-through to Lambda. That wastes 80% of its capabilities.
1. Request Validation
API Gateway can validate requests before they reach your Lambda. This reduces unnecessary invocations and costs.
- Define request models with JSON Schema
- Validate path parameters, query strings and headers
- Return 400 errors directly from API Gateway
2. Throttling and Usage Plans
Protect your backend from excessive traffic:
- Per-route throttling: limit sensitive endpoints
- Usage Plans: differentiate access levels (free, pro, enterprise)
- API Keys: track usage per client
- Burst limits: absorb spikes without crashing
3. Response Caching
Enable API Gateway cache for stable responses:
- Configurable TTL per method
- Cache key on relevant parameters
- Invalidation via Cache-Control header
- Significant savings on Lambda invocations
4. Custom Authorizers
Lambda Authorizers are powerful but expensive. Optimize them:
- Cache the authorizer result (minimum 5-minute TTL)
- Use JWT tokens to avoid database calls
- Structure the returned IAM policy to be granular
5. Observability
- Enable CloudWatch Logs at the API level
- Monitor key metrics: 4XXError, 5XXError, Latency, Count
- Set alarms on error spikes
- Use X-Ray for distributed tracing
Conclusion
API Gateway is a critical component of your serverless architecture. By leveraging its advanced features, you reduce load on your Lambdas, improve security and gain performance.
Need to optimize your API Gateway? Let's talk.