code: def run(app: web.Application):
      
      host = app['config']['host']
      port = app['config']['port']
  
      # starts app. run_app() will automatically start the async context.
      web.run_app(app, host=host, port=port)
docs: Runs the application in an async context.
      This function will block indefinitely until the application is shut down.
  
      Args:
          app (web.Application):
              The Aiohttp Application as created by `create_app()`