code: def article_parse(self, response, rss_title=None):
          
          if not self.helper.parse_crawler.content_type(response):
              return
  
          yield self.helper.parse_crawler.pass_to_pipeline_if_article(
              response, self.ignored_allowed_domain, self.original_url,
              rss_title)
docs: Checks any given response on being an article and if positiv,
          passes the response to the pipeline.
  
          :param obj response: The scrapy response
          :param str rss_title: Title extracted from the rss feed