• /terraform contains the necessary infrastructure. It is also used to deploy new versions of the lambda.
• lambda.js contains the lambda code.
• cloudfront.js contains the CloudFront function code.

The lambda function reads three parameters from the request body, operation, left and right:

curl https://e4mewkyvkkby4klt5w6ffhorpq0lcasn.lambda-url.eu-north-1.on.aws \
  -d '{"operation": "ADD", "left": 1, "right": 2}'

The CloudFront function reads three query parameters, operation, left and right:

curl 'https://dmfsnsw659qrm.cloudfront.net?operation=ADD&left=1&right=2'