def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.
        # Should return either None or an iterable of Request or item objects.
        if exception == IpBannedException:
            with Controller.from_port(port = 9051) as controller:
                controller.authenticate()
                controller.signal(Signal.NEWNYM)
                logging.warning("IP rotated")
                new_request = response.request.replace(dont_filter=True)
                logging.warning("retry request")
                yield new_request
                raise exceptions.IgnoreRequest