docs: def _get_request_url(self, instance, url):
          """
          Get the request address, build with proxy if necessary
          """
          parsed = urlparse(url)
  
          _url = url
          if not (parsed.netloc and parsed.scheme) and is_affirmative(instance.get('spark_proxy_enabled', False)):
              master_address = self._get_master_address(instance)
              _url = urljoin(master_address, parsed.path)
  
          self.log.debug('Request URL returned: %s', _url)
          return _url