Is it possible to host a gRPC server in GAE Standard environment using Python? I have seen https://cloud.google.com/endpoints/docs/grpc/tutorials which seems to me you have to use ESP to host a gRPC server in GCP (GAE Standard is not listed here). Is ESP the only way to implement a gRPC server? Can't I write my own gRPC implementation such as https://grpc.io/docs/languages/python/basics/ and host it in GAE Standard?
I apologize for the basic questions as gRPC is quite new to me.