Get RSS on Cloud Function

index.js

exports.helloWorld = function helloWorld(req, res) {
  var FeedParser = require('feedparser');
  var request = require('request');
  var feed = '====RSS_URL===';

  var req2 = request(feed);
  var feedparser = new FeedParser({});
  var items = [];
  var titles = '';

  req2.on('response', function (res2) {
    this.pipe(feedparser);
  });

  feedparser.on('readable', function() {
    while(item = this.read()) {
      items.push(item);
    }
  });

  feedparser.on('end', function() {
    // show titles
    items.forEach(function(item) {
      titles += item.title
      titles += '\n'
    });

    // Example input: {"message": "Hello!"}
    if (req.body.message === undefined) {
      // This is an error case, as "message" is required.
      res.status(400).send('No message defined!');
    } else {
      // Everything is okay.
      console.log(req.body.message);
      res.status(200).send('Success: ' + req.body.message + '\n' + titles);
    }
  });
};