Question

A development team builds a serverless application using AWS SAM. Before deploying to the cloud, they want to run and debug their Lambda function handler logic locally, invoking it with a sample API Gateway event payload to verify the response, without incurring AWS charges or deploying anything. Which approach best supports this requirement during development?

Accepted Answer

Use the AWS SAM CLI to invoke the function locally with 'sam local invoke', passing a generated event file so the handler runs in a local container.

Answer

Deploy the stack with 'sam deploy' to a dedicated test account and invoke the function through the API Gateway endpoint using curl.

Answer

Enable AWS X-Ray tracing on the deployed function and replay recorded traces to validate the handler logic.

Answer

Configure provisioned concurrency on the function so it stays warm, then invoke it repeatedly from the Lambda console test tab.