Create API Gateway and Integrate with Lambda

Objective

Connect AWS API Gateway with a Lambda Function to create a RESTful endpoint that allows accessing data stored in DynamoDB.

Implementation Steps

1. Access API Gateway

• Go to AWS Console → API Gateway
• Click Create API

• Select REST API (Build)

• Configure:
  • Create new API: New API
  • API name: FlyoraAPI
  • Endpoint type: Regional
• Click Create API

2. Create Resources and Methods

1. In the sidebar, select
   Actions → Create Resource

• Resource Name: api
• Click Create Resource

2. Select /api → Actions → Create Resource

3. Configure the resource:

• Resource path: /api/
• Resource Name: v1
• Click Create Resource

4. Create a proxy resource under /api

• Check Proxy resource
• Resource path: /api/
• Resource Name: {proxy+}
• Click Create Resource

5. Select /v1 → Actions → Create Resource

Configure:

• Check Proxy resource
• Resource path: /api/v1/
• Resource Name: {myProxy+}
• Click Create Resource

6. Enable CORS for all resources

Under OPTIONS → Integration response → Header Mappings, ensure the headers below exist:

• Access-Control-Allow-Origin: *
• Access-Control-Allow-Headers:
  Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token
• Access-Control-Allow-Methods:
  DELETE,GET,HEAD,OPTIONS,PATCH,POST,PUT

3. Integrate with Lambda

1. After creating /api/v1/{myProxy+}, the ANY method appears:
   • Select ANY → Integration request → Edit

2. Attach Lambda:

• Integration type: Lambda Function
• Check Lambda proxy integration
• Lambda Region: ap-southeast-1 (Singapore)
• Lambda Function: select your Lambda_API_Handler

4. Deploy API

• Select Actions → Deploy API
• Deployment stage: New stage
  • Stage name: dev
  • Description: Development stage for Lambda API
• Click Deploy

After deployment, you will receive an Invoke URL in the format:

https://<api_id>.execute-api.ap-southeast-1.amazonaws.com/dev