code: def load(self):
          
          LOGGER.debug('%s: start checking: %s', self.name, self.query)
          if self.waiting:
              self.notify('warning', 'Process takes too much time', target='waiting', ntype='common')
          else:
              self.waiting = True
              try:
                  response = yield self.client.fetch(
                      self.query, method=self.options.get('method', 'GET'),
                      request_timeout=self.request_timeout,
                      connect_timeout=self.connect_timeout,
                      validate_cert=self.options.get('validate_cert', True))
                  self.check([(self.get_data(response), self.query)])
                  self.notify('normal', 'Metrics are loaded', target='loading', ntype='common')
  
              except Exception as e:
                  self.notify('critical', str(e), target='loading', ntype='common')
  
              self.waiting = False
docs: Load URL.