Session Timeout redirect URL

Question

Once the expire pop up appears, how does Liferay know the login URL.?

ex.. if the expired page is

'http://localhost:8080/web/2Fsite/2Fmodule'

And F5 is pressed,how does Life ray know that the URL is

' http://localhost:8080/web/guest/home?_58_redirect=%2Fweb%2Fsite%2Fmodule'...

is this Struts action?

Answer 1

Check com.liferay.portal.servlet.MainServlet - processServicePrePrincipalException method:

String currentURL = PortalUtil.getCurrentURL(request);
redirect = HttpUtil.addParameter(redirect, "redirect", currentURL);