text: const escapeHtml = require('escape-html');
  
  const rookout = require('rookout');
  rookout.start();
  
  /**
   * Responds to any HTTP request.
   *
   * @param {!express:Request} req HTTP request context.
   * @param {!express:Response} res HTTP response context.
   */
  exports.helloWorld = (req, res) => {
    let message = req.query.message || req.body.message || 'Hello World!';
    res.status(200).send(message);
  };
  