Guide is here: gRPC-Web helloworld example

Start first the Envoy container:

docker build -t helloworld/envoy -f ./envoy.Dockerfile .
docker run -d -p 8080:8080 helloworld/envoy

Run the server:

node server.js

Open the index.html with your favorite browser and contemplate the hello world.

Rebuild the client.js script using Webpack:

npx webpack client.js

Using Docker for Windows, take note of this commit for your Envoy container to contact a service of your host machine. More information with this issue gRPC-Web #402.