Implementing Serverless Gateway Integration
1. Configuring AWS API Gateway
| Type | Use |
|---|---|
| REST API | Full features, higher cost |
| HTTP API | 70% cheaper, lower latency |
| WebSocket API | Bidirectional persistent |
| Private API | VPC endpoint only |
2. Using Azure API Management
| Tier | Use |
|---|---|
| Consumption | Serverless, pay-per-call |
| Developer | Non-prod, no SLA |
| Basic/Standard | Prod, fixed unit |
| Premium | VNet, multi-region, SLA |
| v2 Standard | New, modern features |
3. Implementing Google Cloud Endpoints
| Variant | Detail |
|---|---|
| Endpoints for OpenAPI | ESPv2 (Envoy-based) |
| Endpoints for gRPC | Native gRPC management |
| API Gateway (preferred) | Managed control plane |
| Apigee X | Enterprise platform |
4. Setting Up Lambda Integration
Example: Lambda Proxy integration
Resources:
ApiRoute:
Type: AWS::ApiGatewayV2::Route
Properties:
ApiId: !Ref HttpApi
RouteKey: "GET /orders/{id}"
Target: !Sub "integrations/${LambdaIntegration}"
LambdaIntegration:
Type: AWS::ApiGatewayV2::Integration
Properties:
ApiId: !Ref HttpApi
IntegrationType: AWS_PROXY
IntegrationUri: !GetAtt OrdersFn.Arn
PayloadFormatVersion: "2.0"5. Configuring Azure Functions Integration
| Binding | Use |
|---|---|
| APIM ↔ Function | Managed identity auth |
| Function key | Header x-functions-key |
| Premium plan | No cold start, VNet |
| Flex Consumption | New, fast scale |
6. Using Cloud Functions Integration
| Gen | Detail |
|---|---|
| 2nd gen (Cloud Run) | Up to 60 min, concurrency > 1 |
| Triggers | HTTPS, Pub/Sub, Storage, Eventarc |
| Gateway routing | API Gateway → CF backend |
| Auth | IAM, Firebase, Identity Platform |
7. Implementing Cold Start Optimization
| Technique | Detail |
|---|---|
| Provisioned concurrency | Lambda warm pool |
| Min instances | Cloud Run/Functions |
| SnapStart (Java) | Restore from snapshot |
| Smaller deployment | Tree-shake, no bundlers |
| ARM64 (Graviton) | Faster init, cheaper |
| Avoid VPC ENI | Or use shared ENI |
8. Setting Up Serverless Authentication
| Option | Detail |
|---|---|
| Lambda authorizer | Custom auth Lambda |
| Cognito user pool | Built-in JWT validation |
| IAM auth (SigV4) | Service-to-service |
| API key | Usage plan + key |
| Mutual TLS | Custom domain mTLS |
9. Configuring Serverless Rate Limiting
| Mechanism | Limit |
|---|---|
| API Gateway throttle | RPS + burst per stage |
| Usage plan | Per API key quotas |
| Lambda reserved conc | Caps function execution |
| SQS buffering | Decouple bursts |
10. Using Serverless Event Triggers
| Source | Pattern |
|---|---|
| S3 ObjectCreated | File upload → process |
| DynamoDB Streams | Change data capture |
| EventBridge | Event bus routing |
| SQS | Queue → Lambda batch |
| Kinesis | Stream processing |
| Scheduled (cron) | EventBridge rate |