title: Where can I find the 'youtube-v3-api-captions.json' discovery document?
body: <p>I'm trying to use the YouTube API to fetch video captions, but the example is incomplete: <a href="https://developers.google.com/youtube/v3/code_samples/python#create_and_manage_youtube_video_caption_tracks" rel="noreferrer">https://developers.google.com/youtube/v3/code_samples/python#create_and_manage_youtube_video_caption_tracks</a></p>
  
  <p>Specifically, it has this comment + code:</p>
  
  <pre><code># Trusted testers can download this discovery document from the developers page
  # and it should be in the same directory with the code.
  with open("youtube-v3-api-captions.json", "r") as f:
    doc = f.read()
    return build_from_document(doc, http=credentials.authorize(httplib2.Http()))
  </code></pre>
  
  <p>But it's not at all clear where the <code>youtube-v3-api-captions.json</code> file can be found.</p>
  
  <p>Where can it be found?</p>