curl -i -X OPTIONS "https://api.box.com/2.0/events" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

{
  "chunk_size": 1,
  "entries": [
    {
      "type": "realtime_server",
      "url": "http://2.realtime.services.box.net/subscribe?channel=cc807c9c4869ffb1c81a&stream_type=all",
      "ttl": "10",
      "max_retries": "10",
      "retry_timeout": 610
    }
  ]
}