title: Khan Academy API call
body: <p>I'm trying to make a call to Khan Academy API from the browser.</p>
  
  <pre><code>http://www.khanacademy.org/api/v1/playlists/Algebra/videos
  </code></pre>
  
  <p>For some reason I receive empty list:</p>
  
  <pre><code>[]
  </code></pre>
  
  <p>What's wrong here, the API call seems fine to me?</p>