Simple CORS in AWS Lambda - Serverless Architecture

Problem Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://12gddshj.execute-api.us-east-1.amazonaws.com/dev/api/email/send. (Reason: CORS header 'Access-Control-Allow-Origin' missing). or XMLHttpRequest cannot load https://12gddshj.execute-api.us-east-1.amazonaws.com/dev/api/email/send. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access. The response had HTTP status code 400. When calling…