Response from grpc-web client request is undefined

Hello,

I cannot post the code due company policy (apologies). However, I currently have a python grpc server and a grpc-web client. My client can send requests to the server (through envoy) and the server can receive it. However, the client cannot receive a response back. The response from the calling promise is undefined. I have tried a few things and cannot get it resolved. Any insight on why this could be happening would be appreciated.