public async Task<Room> CreateRoomAsync(string groupId, CreateRoomRequest request)
{
string url = _baseApiAddress + $"groups/${groupId}/rooms";
#if __IOS__ || __ANDROID__ || NET45
var content = new StringContent(JsonConvert.SerializeObject(request));
#endif
#if NETFX_CORE
var content = new HttpStringContent(JsonConvert.SerializeObject(request));
#endif
return await HttpClient.PostAsync<Room>(url, content);
}