code: def parse(self, response):
          
          if not self.helper.parse_crawler.content_type(response):
              return
  
          for request in self.helper.parse_crawler \
                  .recursive_requests(response, self, self.ignore_regex,
                                      self.ignore_file_extensions):
              yield request
  
          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