Question

A developer is deploying a serverless application using the AWS Serverless Application Model (SAM). The template defines an AWS::Serverless::Api resource with an OpenAPI specification in the DefinitionBody property. The template also defines an AWS::Serverless::Function resource.

Within the OpenAPI specification, the developer configures the integration for a POST route as follows:

yaml
paths:
/orders:
post:
x-amazon-apigateway-integration:
type: "aws"
httpMethod: "POST"
uri:
Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${OrderFunction.Arn}/invocations"

The Lambda function handler is implemented to return the following structure:

{
"statusCode": 201,
"body": "{\"message\": \"Order created successfully\"}",
"headers": {
"Content-Type": "application/json"
}
}

When the client sends a POST request to /orders, it receives an HTTP status code of 200 OK with the following response body:

{
"statusCode": 201,
"body": "{\"message\": \"Order created successfully\"}",
"headers": {
"Content-Type": "application/json"
}
}

Which configuration change should the developer make to ensure the client receives an HTTP status code of 201 Created with the message body '{"message": "Order created successfully"}'?