Pick the right integration type

At NimbusCart, you're putting an API Gateway in front of a Lambda function and need to choose the right integration type for the endpoint.

Use the integration explorer to compare API Gateway integration types. Pick each option in the segmented control and watch how the incoming request flows to the backend, whether a mapping template is involved, and how the request-validation toggle changes things. Compare the options before you answer.

Question: Which API Gateway integration type passes the entire incoming request to your Lambda function unchanged and returns whatever the function responds?