text: 
  /**
   * Module dependencies.
   */
  
  const cluster = require('cluster'),
    numCPUs = require('os').cpus().length,
    express = require('express');
  
  const bodyParser = require('body-parser');
  
  if (cluster.isMaster) {
    // Fork workers.
    for (let i = 0; i < numCPUs; i++) {
      cluster.fork();
    }
  
    cluster.on('exit', (worker, code, signal) =>
      console.log('worker ' + worker.pid + ' died'));
  } else {
    const app = module.exports = express();
  
    // Configuration
    app.use(bodyParser.urlencoded({ extended: true }));
  
    // Set headers for all routes
    app.use((req, res, next) => {
      res.setHeader("Server", "Express");
      return next();
    });
  
    app.set('view engine', 'jade');
    app.set('views', __dirname + '/views');
  
    // Routes
    app.get('/json', (req, res) => res.send({ message: 'Hello, World!' }));
  
    app.get('/plaintext', (req, res) =>
      res.header('Content-Type', 'text/plain').send('Hello, World!'));
  
    app.listen(8080);
  }
  