diff --git a/route.php b/route.php
index 7bd9e5a..e7f4d74 100644
--- a/route.php
+++ b/route.php
@@ -28,6 +28,9 @@ class route
   public $errors = null;
   /** Preroute used in modules */
   public $preroute = "";
+  /** Authentication URL used if a 401 error is raised. If none is defined,
+      just display a "Unauthorized" message */
+  public $authenticationURL = null;
 
   /** Return the baseURL of the site
       Always finish with a slash
@@ -456,6 +459,12 @@ class route
       exit;
     }
 
+    if ($this->authenticationURL !== null && $getCode === 401)
+    {
+      // Non autorized users should be authenticated
+      $this->redirect ($this->authenticationURL.$this->requestURL(), "");
+    }
+
     $http = new http ();
     @header ($_SERVER["SERVER_PROTOCOL"]." $getCode ".
              $http->codetext ($getCode));