text: const express = require('express');
  const redis = require('redis');
  
  const app = express();
  const client = redis.createClient({
    host: 'redis-server',
    port: 6379
  });
  client.set('visits', 0);
  
  app.get('/', (req, res) => {
    client.get('visits', (err, visits) => {
      res.send('Number of visits is: ' + visits);
      client.set('visits', parseInt(visits++) + 1);
    });
  });
  
  app.listen(8081, () => {
    console.log('Listening on port 8081');
  });