Phase III: API & Networking

Professional REST API with API Gateway

Duration: 60 minutes | Focus: API Gateway, CORS Configuration, REST API Design

🎯 Phase Overview

Transform your Lambda function into a professional REST API that can be accessed from web applications. You’ll configure Amazon API Gateway with proper CORS support, request validation, and error handling to create a production-ready API endpoint.

📋 What You’ll Accomplish

By the end of this phase, you will have:

  • ✅ REST API: Professional API Gateway configuration
  • ✅ CORS Support: Cross-origin resource sharing properly configured
  • ✅ Lambda Integration: Seamless connection between API and Lambda function
  • ✅ Request Validation: Input validation and error handling
  • ✅ API Documentation: Complete endpoint documentation
  • ✅ Testing Suite: Comprehensive API testing procedures

🌐 API Features

Your API will provide:

  • RESTful Design: Clean, intuitive endpoint structure
  • CORS Enabled: Support for web application integration
  • Error Handling: Comprehensive error responses with proper HTTP codes
  • Request Validation: Input sanitization and validation
  • Performance: Sub-15 second response times
  • Scalability: Auto-scaling to handle 1000+ concurrent requests

🏗️ Phase Components

ModuleTopicTimeDescription
3.1API Gateway Setup30 minCreate REST API, resources, and methods
3.2CORS Configuration15 minEnable cross-origin resource sharing
3.3API Testing & Documentation15 minTest endpoints and create documentation

🔗 API Endpoint Structure

Your final API will have this structure:

https://[api-id].execute-api.ap-southeast-1.amazonaws.com/prod/
├── POST /analyze    # Color analysis endpoint
└── OPTIONS /analyze # CORS preflight endpoint

💰 Cost Considerations

AWS Free Tier Benefits:

  • API Gateway: 1M requests/month free
  • Data Transfer: 1GB/month free
  • Estimated cost: $0 during workshop

🔒 Security Features

  • HTTPS Only: All API calls encrypted in transit
  • CORS Control: Controlled cross-origin access
  • Input Validation: Request sanitization and validation
  • Error Handling: Secure error responses without data leakage
  • Rate Limiting: Built-in throttling protection

📊 Performance Targets

  • Response Time: <15 seconds end-to-end
  • Throughput: 1000+ requests/minute
  • Availability: 99.9% uptime
  • Error Rate: <1% under normal conditions

🎯 Success Criteria

You’ll know this phase is complete when:

  • API Gateway created and configured
  • POST /analyze endpoint working
  • CORS properly configured
  • Lambda integration functional
  • API responds to test requests
  • Error handling working correctly
  • API documentation complete

Ready to expose your function? Start with Module 3.1 - API Gateway Setup to create your professional REST API.

🔄 Phase Navigation

Previous Phase: Phase II - Core Services Deployment
Next Phase: Phase IV - Storage & Web Hosting

Let’s make your Lambda function accessible to the world! 🌐