title: Google Actions sdk not playing audio in ssml from firebase storage
body: <p>Google Actions SDK is unable to play audio files in SSML Audio tag from firebase storage. Although I could play same .ogg format file from wikipedia. 
  <a href="https://upload.wikimedia.org/wikipedia/en/9/9f/Sample_of_%22Another_Day_in_Paradise%22.ogg" rel="nofollow noreferrer">https://upload.wikimedia.org/wikipedia/en/9/9f/Sample_of_%22Another_Day_in_Paradise%22.ogg</a></p>
  
  <p><strong>firebase file</strong>:
  <a href="https://firebasestorage.googleapis.com/v0/b/assisto-skill.appspot.com/o/TIP103_converted.mp3?alt=media&amp;token=d0d08f9d-e340-478c-af00-657109683136" rel="nofollow noreferrer">https://firebasestorage.googleapis.com/v0/b/assisto-skill.appspot.com/o/TIP103_converted.mp3?alt=media&amp;token=d0d08f9d-e340-478c-af00-657109683136</a></p>
  
  <p>I'm using it by sending an SSML string that looks like:</p>
  
  <pre><code>&lt;speak&gt;
    &lt;audio src='https://firebasestorage.googleapis.com/v0/b/assisto-skill.appspot.com/o/TIP103_converted.mp3?alt=media&amp;token=d0d08f9d-e340-478c-af00-657109683136'&gt;
    &lt;/audio&gt;
  &lt;/speak&gt;
  </code></pre>
  
  <p>But I'm getting the following error:</p>
  
  <blockquote>
    <p>expected_inputs[0].input_prompt.rich_initial_prompt.items[0].simple_response: 'ssml' could not be parsed.</p>
  </blockquote>
  
  <p>What could be the reason...Is this a limitation in actions sdk that url needs to be parameter free?</p>