code: function onListening () {
          let addr = server.address(),
              bind = typeof addr === 'string'
            ? 'pipe ' + addr
            : 'port ' + addr.port;
          we.log.info('Run in '+we.env+' enviroment and listening on ' + bind);
  
          if (process.send) {
            process.send('ready');
          }
        }
docs: Event listener for HTTP server "listening" event.