code: def _fetch_in_reactor(url, spider_cls=DefaultSpider, **kwargs):
      
      def parse(self, response):
          self.response = response
      req = Request(url) if isinstance(url, six.string_types) else url
      req.dont_filter = True
      req.meta['handle_httpstatus_all'] = True
      spider_cls = override_start_requests(spider_cls, [req], parse=parse)
      return _run_spider_in_reactor(spider_cls, **kwargs)
docs: Fetches an URL and returns the response.
  
      Parameters
      ----------
      url : str
          An URL to fetch.
      spider_cls : scrapy.Spider (default: DefaultSpider)
          A spider class to be used in the crawler.
      kwargs : dict, optional
          Additional arguments to be passed to ``_run_spider_in_reactor``.
  
      Returns
      -------
      crochet.EventualResult