How portal handls actionStatus and action Message with logout process?

Migrateduser

During error handling on logout, any class or properties will send error messages to our custom logout.jsp. Becuase we are trying to read below request parameters inside logout.jsp

String actionStatus = (String)request.getParameter("actionStatus");
String actionMessage = (String)request.getParameter("actionMessage");

and if actionStatus is "ERROR" we are printing the actionMessage on logout.jsp.

Wondering who will send the values for actionMessage and actionStatus.

We explored our code base. But, we cannot find any instance of sending values to these parameters from any of our java or jsp files from back end. Seems like portal frame is doning.

Anyone clue will be appreciated.

thanks