$ curl https://speech.googleapis.com/v1/operations/4991797898110422940?key=abcde
{
  "name": "4991797898110422940",
  "metadata": {
    "@type": "type.googleapis.com/google.cloud.speech.v1.LongRunningRecognizeMetadata",
    "progressPercent": 100,
    "startTime": "2017-10-26T18:23:01.509111Z",
    "lastUpdateTime": "2017-10-26T18:47:08.597657Z"
  },
  "done": true,
  "error": {
    "code": 13,
    "message": "Server unavailable, please try again later."
  }
}