code: def _check_if_complete(self, url, json_response):
          
          if '__done' in json_response and isinstance(json_response, list):
              mr_parts = list(urlparse(url))
              mr_query = parse_qs(mr_parts[4])
              mr_query['mr'] = '"' + str(json_response[0]) + '"'
              mr_parts[4] = urlencode(mr_query, True)
              mr_link = urlunparse(mr_parts)
              mr_j, mr_r = self._ajax(mr_link)
              self.log.debug('MultipleRedirect link: %s', mr_link)
              return super(Installer, self)._check_if_complete(url, mr_j)
  
          return False
docs: Check if a request has been completed and return the redirect URL if it has
          @type   url:            str
          @type   json_response:  list or dict
          @rtype: str or bool