Feature Request: Modify Response Prior to Lambda Handler Invocation

[andrestoll]

Motivation: In the current implementation of the chaos-lambda-extension, the Lambda function handler is invoked before any modifications are made to the response. For certain use cases, particularly in testing and chaos engineering scenarios, having the ability to modify the response before the Lambda handler is invoked can provide more flexibility and control.

Detailed Description: I propose a feature that allows the chaos-lambda-extension to modify the response prior to invoking the Lambda function handler. This feature would enable users to inject faults or modify the response in a way that the Lambda function can immediately react to, allowing for more comprehensive testing and resilience checks.

Use Cases:

• Modifying responses with 4XX response

Potential Challenges:

• Ensuring backward compatibility for existing users who expect the current behavior.

Alternatives Considered: Option to do it before or after., through env variable

[having-fun-serverless]

@andrestoll just to make sure that I follow, do you want to change the response or the request, right now you do have the ability to inject your own response, check https://github.com/aws-cli-tools/chaos-lambda-extension#response-fault

[andrestoll]

I would like to have the possibility to post (an error) response before invoking the function handler.

The reason being is you might want to respond with HTTP code 500. But you're function completes successfully.