AWS DevOps Engineer Professional Practice Test

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What is the purpose of a Mapping Template in AWS API Gateway?

To authenticate users before accessing the API
To remove deprecated parameters from incoming requests
To log API requests for auditing
To monitor performance metrics of the API

The correct answer is: To remove deprecated parameters from incoming requests

A Mapping Template in AWS API Gateway is primarily used to transform the incoming request payload into a format that your back-end service can understand. Specifically, it allows for modification of request data, which includes the ability to remove, modify, or add parameters. This capability is vital when you want to clean up incoming requests by eliminating deprecated parameters or unnecessary data fields before they are passed to your service. When dealing with API versioning or updates where certain parameters are no longer used, Mapping Templates enable developers to ensure that only the relevant data is forwarded to the backend. This keeps both the frontend and backend services in sync and can prevent issues related to deprecated data handling. While other options involve important functionalities of API Gateway, they do not specifically relate to the transformation of requests, which is the core function of a Mapping Template.