@app.get('/') def index(req, res): obj = {'title': "FooBar"} res.render("home", obj) @app.get('/hello') def hello_world(req, res): res.send_text("Hello World!!") @app.use def error_handler(req, res, err): res.send_text("404 : Hello World!!") app.print_middleware_tree() loop = asyncio.get_event_loop() server_params = { 'host': '127.0.0.1', 'port': 8000, } make_server = loop.create_server(app._protocol_factory(app), **server_params) loop.run_until_complete(make_server) loop.run_forever()