gRPC-Web Basics Tutorial is incomplete

I'm working on a proof-of-concept using gRPC-Web. I was able to get the [Quick Start tutorial](https://grpc.io/docs/platforms/web/quickstart/) working. My next challenge is to adapt this demo by writing a gRPC-Web client in JavaScript that talks to my (very simple) gRPC server written in Python. Is this possible? I am following the [Basics Tutorial](https://grpc.io/docs/platforms/web/basics/) but it is incomplete. In particular, some of the client-side Javascript code is missing, and the code snippet that is there is different from the corresponding code in the Docker containers from the Quick Start tutorial.

I am able to build the JavaScript stubs for my client. However, my gRPC server (Python) never sees any requests from the client (JavaScript). Not sure if this is due to a bug in my JavaScript, a bug in the Envoy proxy config, or something else. Troubleshooting is difficult because the Docker containers are based on a very minimal Linux install that is missing basic Unix tools.

I can offer to help document this once I get it working, but I would need some help from your team to get it working in the first place.