Extend Action.redirect() (add new param "permanently" for set header 301 Moved permanently).

app/Action.php

@@ -39,9 +39,13 @@ abstract class Action
      * Redirect
      *
      * @param mixed $url
+     * @param bool $permanently
      */
-    protected function redirect($url = null)
+    protected function redirect($url = null, $permanently = false)
     {
+        if ($permanently) {
+            header('HTTP/1.1 301 Moved Permanently');
+        }
         header('Location: ' . (($url) ? $url : Env::getRequestUri()));
         exit();
     }