// _perform_auth_request
private static async Task <Dictionary <string, string> > performAuthRequestAsync(Dictionary <string, string> data)
{
var content = new FormUrlEncodedContent(data);
var response = await httpClient.PostAsync(authUrl, content);
response.EnsureSuccessStatusCode();
var result = await response.Content.ReadAsStringAsync();
return(GoogleKeyUtils.ParseAuthResponse(result));
}
