public override HttpMessageHandler CreateMessageHandler()
{
_handlerInfo = ApiOAuthClientHandler.Create(
_authUrl, ConfigurationManager.AppSettings["ClientId"], ConfigurationManager.AppSettings["ClientSecret"],
new[] { "query_mapdata", "query_mapairdata", "talk_tower", "query_userinfo" }, _existingState, true, "https://aawings.com/",
new WpfAuthorizeDisplay());
return _handlerInfo.ClientHandler;
}