aws-lambda
Core components for RESTful AWS lambda endpoints.
See image-service for a concrete usage example.
API Gateway
APIs built with aws-lambda require additional setup on API Gateway.
After creating an API Gateway API for the lambda by configure it as proxy resource the CORS configuration needs to be customized:
Select the /{proxy+} resource and from the Actions drop-down select Enable CORS.
Add Content-Length to the Access-Control-Allow-Headers list.
Put 'Content-Type' in the Access-Control-Expose-Headers list under Advanced.
Click Enable CORS and replace existing CORS headers.
Don't forget to deploy the API afterwards.