AWS Lambda Proxy Custom Alexa Skill when you don't have https

Is this still working? I’ve developed a fair few Alexa skills and should have the knowledge but I just can’t get it working.

Response invalid from the Alexa Skills kit test tool and trying to test with a sample intent through the Lambda console doesn’t work either - I get the error ‘no url found for application id’ ?

Also you can only choose NodeJS 4.3 now ? Not sure if this breaks your code?

I was considering writing an updated Lambda function using the official Amazon NodeJS SDK to do it but I don’t have experience of the HA Alexa API. Is this documented anywhere? I’d like to test it using Postman.

Or if anyone could help me to get this working that would be good.