POST https://www.googleapis.com/calendar/v3/freeBusy?prettyPrint=false
Content-Type: application/json

{
  "items": [
    {
      "id": "MockAccount"
    }
  ],
  "timeMax": "2018-04-02T14:00:00Z",
  "timeMin": "2018-04-01T08:00:00Z"
}
