text: 
  const app = require('./app'),
      port = ( process.env.PORT || 3100 ),
      host = ( process.env.HOST || undefined );
  
  const server = app.listen( port, host, () => {
    // ask server for the actual address and port its listening on
    const listenAddress = server.address();
    console.log( `pelias is now running on ${listenAddress.address}:${listenAddress.port}` );
  });
  