title: Receiving zero byte audio stream when doing Amazon Polly text to speech conversions
body: <p>I'm trying to do text to speech conversions using Amazon Web Services Polly and the AWS SDK for C#.  I've attempted a very basic conversion:</p>
  
  <pre><code>AmazonPollyClient client = new AmazonPollyClient("secret", "secret", Amazon.RegionEndpoint.USEast1);
  Amazon.Polly.Model.SynthesizeSpeechRequest request = new SynthesizeSpeechRequest();
  request.OutputFormat = OutputFormat.Mp3;
  request.Text = "This is my first conversion";
  request.TextType = TextType.Text;
  request.VoiceId = VoiceId.Nicole;
  Amazon.Polly.Model.SynthesizeSpeechResponse response = client.SynthesizeSpeech(request);
  </code></pre>
  
  <p>I receive an <code>HTTP 200 OK</code> response (no exceptions are thrown) however the audio stream is empty:</p>
  
  <p><a href="https://i.stack.imgur.com/CPtRl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CPtRl.png" alt="Empty audio stream 1"></a>
  <a href="https://i.stack.imgur.com/xFvg8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xFvg8.png" alt="Empty audio stream 2"></a></p>
  
  <p>What's missing?</p>