API Gateway with Mock Integration - Invalid CF Code about cloudformation-templates HOT 3 CLOSED

$ cd NickolasHKraus/cloudformation-templates

$ aws cloudformation validate-template \
--template-body file://api-gateway-mock-integration/template.yaml

{
    "Parameters": [],
    "Description": "AWS API Gateway with a Mock Integration"
}

$ aws cloudformation deploy \
--stack-name mock-api \
--template-file api-gateway-mock-integration/template.yaml


Waiting for changeset to be created..
Waiting for stack create/update to complete
Successfully created/updated stack - mock-api

$ API_GATEWAY_ID=$(aws apigateway get-rest-apis --query 'items[?name==`mock-api`].id' | grep -o -E "[a-z0-9]+")

$ http -v POST \
https://$API_GATEWAY_ID.execute-api.us-east-1.amazonaws.com/v0/mock \
Content-Type:application/json \
statusCode:=200

POST /v0/mock HTTP/1.1
Accept: application/json, */*;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 19
Content-Type: application/json
Host: swbxg3y917.execute-api.us-east-1.amazonaws.com
User-Agent: HTTPie/2.3.0

{
    "statusCode": 200
}


HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 17
Content-Type: application/json
Date: Mon, 15 Feb 2021 17:55:04 GMT
Via: 1.1 f3fda5ca9ebf687c46ab909cf14e0bae.cloudfront.net (CloudFront)
X-Amz-Cf-Id: 2uS3CyjI_0JBEFsLK054QwXVCUbLR-kqz0mH6ZXn93T8WrXNExloXw==
X-Amz-Cf-Pop: ATL56-C2
X-Cache: Miss from cloudfront
x-amz-apigw-id: azFK4FyKIAMFYZg=
x-amzn-RequestId: 302a256e-557d-439d-bfae-9b120fa1b08f

{
    "message": "OK"
}