diff --git a/src/Pluf/HTTP/Response/NotAvailable.php b/src/Pluf/HTTP/Response/NotAvailable.php
new file mode 100644
index 0000000..c0a479f
--- /dev/null
+++ b/src/Pluf/HTTP/Response/NotAvailable.php
@@ -0,0 +1,44 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of Plume Framework, a simple PHP Application Framework.
+# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
+#
+# Plume Framework is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# Plume Framework is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+class Pluf_HTTP_Response_NotAvailable extends Pluf_HTTP_Response
+{
+    function __construct($request)
+    {
+        $content = '';
+        try {
+            $context = new Pluf_Template_Context(array('query' => $request->query));
+            $tmpl = new Pluf_Template('503.html');
+            $content = $tmpl->render($context);
+            $mimetype = null;
+        } catch (Exception $e) {
+            $mimetype = 'text/plain';
+            $content = sprintf('The requested URL %s is not available at the moment.'."\n"
+                               .'Please try again later.'."\n\n".'503 - Service Unavailable',
+                               Pluf_esc($request->query));
+        }
+        parent::__construct($content, $mimetype);
+        $this->status_code = 503;
+        $this->headers['Retry-After'] = 300; // retry after 5 minutes
+    }
+}