[Twisted-Python] more complex IBodyProducer?

[Kevin McIntyre]

has anyone implemented a more complex IBodyProducer than

class POSTRequestProducer():
    implements(IBodyProducer)
    def __init__(self, body):
        self.body = body
        self.length = len(self.body)

    def startProducing(self, consumer):
        consumer.write(self.body)
        return succeed(None)

    def pauseProducing(self):
        pass

    def stopProducing(self):
        pass


I have an upload intensive application, that during periods of poor
connectivity ends up with a lots on zombie http TCP connections.  I'm
thinking maybe that the "pause" is being called and that my request
deferred is in a paused state.
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