server.js

const express = require('express');
const path = require('path');
const app = express();
// Run the app by serving the static files
// in the dist directory
app.use(express.static(__dirname + '/dist'));

// If an incoming request uses
// a protocol other than HTTPS,
// redirect that request to the
// same url but with HTTPS
const forceSSL = function() {
  return function (req, res, next) {
    if (req.headers['x-forwarded-proto'] !== 'https') {
      return res.redirect(
        ['https://', req.get('Host'), req.url].join('')
      );
    }
    next();
  }
}

// For all GET requests, send back index.html
// so that PathLocationStrategy can be used
app.get('/*', function(req, res) {
  res.sendFile(path.join(__dirname + '/dist/index.html'));
});

// Instruct the app to use the forceSSL middleware
app.use(forceSSL());

// Start the app by listening on the default Heroku port
app.listen(process.env.PORT || 12080);