public async Task<BanUserResponse> BanUserFromRoomAsync(string roomId, string username)
{
string url = _baseApiAddress + $"rooms/{roomId}/bans";
#if __IOS__ || __ANDROID__ || NET45
var content = new FormUrlEncodedContent(new Dictionary<string, string>
{
{"username", username}
});
#endif
#if NETFX_CORE
var content = new HttpFormUrlEncodedContent(new Dictionary<string, string>
{
{"username", username}
});
#endif
return await HttpClient.PostAsync<BanUserResponse>(url, content);
}