Both http and websocket protocol can be used to implement server-browser communication in PyWebIO. The websocket is default, and you can use `pywebio.platform.t

Both http and websocket protocol can be used to implement server-browser communication in PyWebIO. The websocket is default, and you can use `pywebio.platform.tornado_http.start_server()` or `pywebio.platform.path_deploy_http()` to use http polling to communicate.