SignalR doesn't work in this case:
-.NET core Web API hosted on AWS Lambda that configured with SignalR.
-Vue Web site hosted on S3 bucket also configured with SignalR.
Both can't connect on AWS,but they work fine locally on my machine.

I tried to specify the transport type explicitly ( SSE,Long polling)
but in vain.
Error messages I got until now,stuff like the following :

"Server returned handshake error: Handshake was canceled" 

"Error: Connection disconnected with error 'Error: Server returned handshake error: Handshake was canceled.'"

Would it help trying to deploy to Azure instead of AWS ? as Azure SignalR service might help more than AWS ?