code: def on_sigabrt(self, signal_unused, frame_unused):
          
          LOGGER.info('Stopping HTTP Server and IOLoop')
          self.http_server.stop()
          self.ioloop.stop()
docs: Stop the HTTP Server and IO Loop, shutting down the process
  
          :param int signal_unused: Unused signal number
          :param frame frame_unused: Unused frame the signal was caught in