code: def parse(self, response):
          
          if not self.helper.parse_crawler.content_type(response):
              return
  
          yield self.helper.parse_crawler.pass_to_pipeline_if_article(
              response, self.allowed_domains[0], self.original_url)
docs: Checks any given response on being an article and if positiv,
          passes the response to the pipeline.
  
          :param obj response: The scrapy response