将原始的app，包装为包括websocket的app

def wsgi_app(self, environ, start_response):
        """
        将原始的app，包装为包括websocket的app
        """

        path = environ['PATH_INFO']

        if re.match(self.path_pattern, path):
            ws = environ['wsgi.websocket']
            address = (environ.get('REMOTE_ADDR'), environ.get('REMOTE_PORT'))
            self._handle_stream(ws, address)
        else:
            if self.merge_wsgi_app:
                return self.merge_wsgi_app(environ, start_response)
            else:
                start_response("400 Bad Request", [])
                return ['400 Bad Request']