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README.md

Lambda Function URLs (Python)

This sample demonstrates AWS Lambda Function URLs - HTTPS endpoints directly on Lambda functions without requiring API Gateway.

Architecture

                    +-------------------+
                    |                   |
Client (HTTP) ----> | Lambda Function   | ----> Response
                    | URL (HTTPS)       |
                    |                   |
                    +-------------------+

AWS Services Used

  • AWS Lambda: Serverless compute
  • Lambda Function URLs: Built-in HTTPS endpoints

What This Sample Demonstrates

  1. Lambda Function URLs: Creating HTTP endpoints directly on Lambda functions
  2. Public Access: Configuring NONE authentication for public access
  3. Request Handling: Processing HTTP method, path, query params, and body
  4. JSON Responses: Returning structured JSON responses

Prerequisites

  • LocalStack Pro running
  • AWS CLI or awslocal installed
  • jq for JSON parsing

Deployment

Using Scripts

# Deploy the sample
./scripts/deploy.sh

# Run tests
./scripts/test.sh

Using Terraform

cd terraform
./deploy.sh

Testing

The test script validates:

Test Description
Function State Lambda function is Active
URL Configuration Function URL created with NONE auth
Direct Invocation lambda invoke returns 200
HTTP GET GET request via Function URL works
HTTP POST POST with JSON body is processed

Sample Request/Response

Request:

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{"name":"LocalStack"}' \
  "$FUNCTION_URL"

Response:

{
  "message": "Hello from Lambda Function URL!",
  "request": {
    "method": "POST",
    "path": "/",
    "queryParams": {},
    "body": {"name": "LocalStack"}
  },
  "functionName": "local-function-url-xxx"
}

Cleanup

Resources are automatically cleaned up when LocalStack restarts. For manual cleanup:

awslocal lambda delete-function --function-name $FUNCTION_NAME
awslocal iam delete-role --role-name $ROLE_NAME

Azure Equivalent

This sample is the AWS equivalent of deploying an Azure Function with HTTP trigger.