code: def make_server(application, conf_dir=None):
      
      if conf_dir:
          load_config(conf_dir)
      configure_syslog()
      log_config()
      if options.use_ssl:
          ssl_options = ssl_server_options()
          server = tornado.httpserver.HTTPServer(
                  application, ssl_options=ssl_options)
          general_logger.info(
                  'start tornado https server at https://%s:%s'
                  ' with ssl_options: %s', options.ip, options.port, ssl_options)
      else:
  
          server = tornado.httpserver.HTTPServer(application)
          general_logger.info('start tornado http server at http://{0}:{1}'.format(
                  options.ip, options.port))
  
      server.bind(options.port, options.ip)
      return server
docs: Configure the server return the server instance