• Description:
  It demonstrates how to expose a Lambda function as a REST API endpoint using Amazon API Gateway. The Lambda function contains a simple Python handler that returns a static message and HTTP status code. After the Lambda is created, API Gateway is configured to trigger the function via an HTTP request. Once deployed, users can access the endpoint publicly over the internet. This workflow illustrates how serverless compute and API Gateway work together to provide fully managed, scalable backend services without requiring servers.

•  Step 1: Create the Lambda Function
   Open AWS Console → Lambda.
   Click Create function.
   Select Author from scratch.
   Enter:
   Function name: lambda-api-demo
   Runtime: Python 3.10 (or any available)
   Architecture: x86_64
   Leave permissions as default.
   Click Create function.
•  Step 2: Add the Python Code
   In the Lambda code editor, replace the default code with:
  

  def lambda_handler(event, context):
     return {
         "statusCode": 200,
         "body": "Hello from API"
     }
    

   Click Deploy.
•  Step 3: Create a REST API (API Gateway)
   Open AWS Console → API Gateway.
   Click Create API.
   Choose REST API → Build.
   Under "Create new API":
   Select New API
   Name: lambda-api-service
   Click Create API.
•  Step 4: Create a Resource
   In the left panel, click Actions → Create Resource.
   Resource name: hello
   Resource path: /hello
   Click Create Resource.
•  Step 5: Create a GET Method
   Select the /hello resource.
   Click Actions → Create Method.
   Choose GET → ✓.
   Set:
   Integration type: Lambda Function
   Use Lambda Proxy Integration: Enabled
   Region: choose your region
   Lambda Function: lambda-api-demo
   Click Save.
   When prompted for permission, click OK (API Gateway will add invoke permissions).
•  Step 6: Deploy the API
   Click Actions → Deploy API.
   Deployment stage:
   Choose New Stage
   Stage name: prod
   Click Deploy.
•  Step 7: Test the Endpoint
   After deployment, you will get an Invoke URL, for example:
   https://abcd1234.execute-api.ap-south-1.amazonaws.com/prod/hello
   Open it in your browser.
   Output: Hello from API

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