old_contents: "use strict";
  
  const express = require("express");
  const app = express();
  
  // install request
  const request = require('request');
  
  const PORT = process.env.PORT || 3000;
  const rovi = process.env.ROVI_APIKEY || '';
  const echo = process.env.ECHONEST_APIKEY || '';
  
  
  // CORS (Cross-Origin Resource Sharing) headers to support Cross-site HTTP requests
  app.all('*', function(req, res, next) {
      res.header("Access-Control-Allow-Origin", "*");
      res.header("Access-Control-Allow-Headers", "X-Requested-With");
      next();
  });
  
  
  // Request artist information from Rovi API
  app.get('/api/:artist/:sig', (req, res) => {
    const artist = req.params.artist;
    const sig = req.params.sig;
  
    const url = "http://api.rovicorp.com/search/v2.1/music/search?apikey=" + rovi + "&sig=" + sig + "&query=" + artist + "&entitytype=artist&size=1&include=images,musicbio,discography,videos&formatid=62&type=main";
  
    console.log(url);
  
    request.get(url, (err, response, body) => {
      if (err) throw err;
  
      // res.header('Access-Control-Allow-Origin', '*');
      res.send(JSON.parse(body));
    });
  });
  
  
  // Request artist's video information from Rovi API
  app.get('/videos/:artist', (req, res) => {
    const artist = req.params.artist;
  
    const url1 = "http://developer.echonest.com/api/v4/artist/search?api_key=" + echo + "&format=json&name=" + artist + "&results=1";
  
    console.log(url1);
  
    request.get(url1, (err, response, body) => {
      if (err) throw err;
  
      console.log(body);
  
      const url2 = "http://developer.echonest.com/api/v4/artist/video?api_key=" + echo + "&id=ARH6W4X1187B99274F&format=json&results=3&start=0";
  
      console.log(url2);
  
      res.send(JSON.parse(body));
    });
  });
  
  
  app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
  });
  
new_contents: "use strict";
  
  const express = require("express");
  const app = express();
  
  // install request
  const request = require('request');
  
  const PORT = process.env.PORT || 3000;
  const rovi = process.env.ROVI_APIKEY || '';
  const echo = process.env.ECHONEST_APIKEY || '';
  
  
  // CORS (Cross-Origin Resource Sharing) headers to support Cross-site HTTP requests
  app.all('*', function(req, res, next) {
      res.header("Access-Control-Allow-Origin", "*");
      res.header("Access-Control-Allow-Headers", "X-Requested-With");
      next();
  });
  
  
  // Request artist information from Rovi API
  app.get('/api/:artist/:sig', (req, res) => {
    const artist = req.params.artist;
    const sig = req.params.sig;
  
    const url = "http://api.rovicorp.com/search/v2.1/music/search?apikey=" + rovi + "&sig=" + sig + "&query=" + artist + "&entitytype=artist&size=1&include=images,musicbio,discography,videos&formatid=62&type=main";
  
    console.log(url);
  
    request.get(url, (err, response, body) => {
      if (err) throw err;
  
      // res.header('Access-Control-Allow-Origin', '*');
      res.send(JSON.parse(body));
    });
  });
  
  
  // Request artist's video information from Rovi API
  app.get('/videos/:artist', (req, res) => {
    const artist = req.params.artist;
  
    const url1 = "http://developer.echonest.com/api/v4/artist/search?api_key=" + echo + "&format=json&name=" + artist + "&results=1";
  
    console.log(url1);
  
    request.get(url1, (err, response, body) => {
      if (err) throw err;
  
      var artistId = body.response.artists[0].id;
      console.log(body.response.artists[0].id);
  
      const url2 = "http://developer.echonest.com/api/v4/artist/video?api_key=" + echo + "&id=" + artistId + "&format=json&results=3&start=0";
  
      console.log(url2);
  
      request.get(url2, (err, response, body) => {
        if (err) throw err;
  
        res.send(JSON.parse(body));
      });
    });
  });
  
  
  app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
  });
  
subject: Add second nested video call