AWS added support for multiple-valued headers [see here](https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-output-format) We will be forking as this is urgent for us, but will probably submit a PR if our solution works.
AWS added support for multiple-valued headers see here
We will be forking as this is urgent for us, but will probably submit a PR if our solution works.