def gotLength(length):
        """
        Called when L{HTTPChannel} has determined the length, if any,
        of the incoming request's body.

        @param length: The length of the request's body.
        @type length: L{int} if the request declares its body's length
            and L{None} if it does not.
        """

        Called when L{HTTPChannel} has determined the length, if any,
        of the incoming request's body.

        @param length: The length of the request's body.
        @type length: L{int} if the request declares its body's length
            and L{None} if it does not.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/http.py