Why doesn't then work?

Question

JavaScript

I'm trying to learn the promises, but it doesn't work. What is the problem?

let getMoviePage = new Promise(function(resolve, reject) {
  Request.get(searchParams, (err, res, page) => {
    console.log(`movie: ${searchParams.uri}`);

    const $ = cheerio.load(page);
    resolve($('iframe').attr('src'));
  });
});

app.get('/', (request, response) => {
  getMoviePage
    .then(iframe => {
      Request.get(iframe, (err, res, page) => {
        console.log(`iframe: ${playlistFrameLink}`);

        const $ = cheerio.load(page);
        let filePath = $.html();
        let playlistLink = Cut(filePath, { fragmentStart: 'var flashvars = ', fragmentEnd: '\'};' });
        // delete spaces
        playlistLink = playlistLink.replace(/\s+/g, ' ');

       //...

        return playlistLink;
      });
    })
    .then(playlist => {
      console.log(`playlist: ${playlist}`);

      Request.get(playlist, (err, res, page) => {
        const $ = cheerio.load(page);
        return JSON.parse($('body').text());
      });
    })
    .then(playlist => {
      console.log(playlist);
      //...
      response.send(playlistWeight);
    })
    .catch(err => {
      console.error(err);
    });
});