.net return result encoding as utf8
private async Task<string> ResponseMessageAsync(HttpResponseMessage result)
{
string message = await result.Content.ReadAsStringAsync();
string parsedString = Regex.Unescape(message);
byte[] isoBites = Encoding.GetEncoding("ISO-8859-1").GetBytes(parsedString);
return Encoding.UTF8.GetString(isoBites, 0, isoBites.Length);
}