I am working on an app using AWS AppSync. I have enabled the AuthN and AuthZ.
One part I am stuck is at adding CORS filter for Appsync subscriptions.
I have worked on websockets earlier and there too I had this problem. I solved it manually in websockets by filtering the CORS from header during the handshake.
Do we have a provision to invoke a lambda in Appsync when a client is attempting to connect for subscription ?