private void ConnectionClosed(Response response)
 {
     CustomTools.Console.DebugLog("EchoApiManager class", CustomTools.Console.LogMagentaColor("Regular Callback:"), "ConnectionClosed()");
     ResetApi();
     response.SendResultData <string>(reason => OnConnectionClosed.SafeInvoke(reason), null);
 }
 // call when client close connection
 private static void ConnectionClosed(Connection connection)
 {
     CustomTools.Console.DebugLog("Connection closed");
     OnConnectionClosed.SafeInvoke(connection);
 }