from scrapy_redis.dupefilter import RFPDupeFilter



class CustomFilter(RFPDupeFilter):
    def request_seen(self, request):
        """Returns True if request was already seen.

        Parameters
        ----------
        request : scrapy.http.Request

        Returns
        -------
        bool

        """
        if in request.url:
            return False
        fp = self.request_fingerprint(request)
        # This returns the number of values added, zero if already exists.
        added = self.server.sadd(self.key, fp)
        return added == 0

这边我写了一个自定义的过滤器，继承于scrapy-redis中的。因为我有个需求是，这条url不过滤。

settings.py

DUPEFILTER_CLASS = 'tutorial.CustomFilter.CustomFilter'

注意我项目名字是tutorial