title: Google Speech Recognition API Result is Empty
body: <p>I'm performing an asynchronous request to Google Cloud Speech API, and I do not know how to get the result of operation:</p>
  
  <p><strong>Request POST:</strong> <a href="https://speech.googleapis.com/v1beta1/speech:asyncrecognize" rel="noreferrer">https://speech.googleapis.com/v1beta1/speech:asyncrecognize</a></p>
  
  <p><strong>Body:</strong></p>
  
  <pre><code>{
      "config":{
                   "languageCode" : "pt-BR",
                   "encoding" : "LINEAR16",
                   "sampleRate" : 16000
               },
       "audio":{
                   "uri":"gs://bucket/audio.flac"
               }
  }
  </code></pre>
  
  <p><strong>Which returns:</strong></p>
  
  <p><code>{ "name": "469432517" }</code></p>
  
  <p>So, I do a POST: <a href="https://speech.googleapis.com/v1beta1/operations/469432517" rel="noreferrer">https://speech.googleapis.com/v1beta1/operations/469432517</a></p>
  
  <p>Which returns:</p>
  
  <pre><code>{
      "name": "469432517",
      "metadata": {
          "@type": "type.googleapis.com/google.cloud.speech.v1beta1.AsyncRecognizeMetadata",
          "progressPercent": 100,
          "startTime": "2016-08-11T21:18:29.985053Z",
          "lastUpdateTime": "2016-08-11T21:18:31.888412Z"
      },
      "done": true,
      "response": {
                      "@type": "type.googleapis.com/google.cloud.speech.v1beta1.AsyncRecognizeResponse"
                  }
  }
  </code></pre>
  
  <p>I need to get the result of the operation: the transcribed text.</p>
  
  <p>How can I do that?</p>