Prevent CAS from doing "keep-alive" redirects on POST requests.

library/Creq/Controller/Action.php

@@ -23,6 +23,11 @@ class Creq_Controller_Action extends Unl_Controller_Action
     		return;
     	}
     	
+    	// If a user is already logged in, only redirect to CAS if this is a GET request.
+    	if (Zend_Auth::getInstance()->hasIdentity() && $_SERVER['REQUEST_METHOD'] != 'GET') {
+    	    return;
+    	}
+    	
         if (array_key_exists('unl_sso', $_COOKIE) || Zend_Auth::getInstance()->hasIdentity()) {	
             Auth_UserModel::authenticateUser();
         }