What does it means?
For example, if we have setup a API Gateway, REST API, GET method point to a Lambda function with no proxy intergration which return:
{ "statusCode": 200, "body": "\"Hello from Lambda! mapping\"" }
[Notice]: If we set with Proxy integration, we will only get the body from the response "Hello from Lambda! mapping"; Mapping template can NOT be used with proxy
If no proxy, then we get whatever Lambda function return to us.
Now we want to mask the response field to a different one:
In this case, we can use Mapping Templates.
To create a Mapping Template for a Method:
Here we renamed `statusCode` & `body`, and added new field `newField`.