Create the app

To start the server, we leverage the startServer() function that expects:

• A host, usually 127.0.0.1 if you work locally or 0.0.0.0 if you work from docker.

• A port, like 8080 (app may be accessed on <HOST>:<PORT> in your web browser).

• A list of functions describing the app, particularly:

  • call expects the HTTP response.
  • onWSOpen expects the websocket server.