def stopProducing():
        """
        In addition to the standard behavior of
        L{IProducer.stopProducing<twisted.internet.interfaces.IProducer.stopProducing>}
        (stop producing data), make sure the
        L{Deferred<twisted.internet.defer.Deferred>} returned by
        C{startProducing} is never fired.
        """

        In addition to the standard behavior of
        L{IProducer.stopProducing<twisted.internet.interfaces.IProducer.stopProducing>}
        (stop producing data), make sure the
        L{Deferred<twisted.internet.defer.Deferred>} returned by
        C{startProducing} is never fired.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/iweb.py