Question

A developer is building an order-processing feature. When a customer submits an order through a web frontend, the frontend calls a Lambda function directly using the AWS SDK and must display the calculated order total to the customer immediately. The developer wants the SDK call to wait for the function to finish and return its result in the response. Which Lambda invocation type should the developer use?

Accepted Answer

Invoke the function with the InvocationType set to RequestResponse (synchronous).

Answer

Invoke the function with the InvocationType set to Event (asynchronous).

Answer

Invoke the function with the InvocationType set to DryRun.

Answer

Configure an event source mapping so Lambda polls for the order and returns the result.