def statusReceived(self, status):
        """
        Callback invoked whenever the first line of a new message is received.
        Override this.

        @param status: The first line of an HTTP request or response message
            without trailing I{CR LF}.
        @type status: C{bytes}
        """

        Callback invoked whenever the first line of a new message is received.
        Override this.

        @param status: The first line of an HTTP request or response message
            without trailing I{CR LF}.
        @type status: C{bytes}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/_newclient.py