text: const express = require('express');
  
  // http://expressjs.com/en/4x/api.html
  const app = express();
  const port = process.env.PORT || 3000;
  const public_path = express.static(__dirname + '/public');
  const index_path = __dirname + '/public/index.html';
  
  app.use(public_path);
  app.get('*', function (request, response) {
    response.sendFile(index_path, function (error) {
      if (error) {
        console.log(error);
      }
    });
  });
  app.listen(port);
  console.log("Listening at http://localhost:" + port);
  