Stop a running SocketIO web server.

        This method must be called from a HTTP or SocketIO handler function.

def stop(self):
        """Stop a running SocketIO web server.

        This method must be called from a HTTP or SocketIO handler function.
        """
        if self.server.eio.async_mode == 'threading':
            func = flask.request.environ.get('werkzeug.server.shutdown')
            if func:
                func()
            else:
                raise RuntimeError('Cannot stop unknown web server')
        elif self.server.eio.async_mode == 'eventlet':
            raise SystemExit
        elif self.server.eio.async_mode == 'gevent':
            self.wsgi_server.stop()