add server environment configuration to keep the multi-adresing support

config/app.php.txt

@@ -6,7 +6,7 @@ ini_set('display_startup_errors', '1');
 error_reporting(E_ALL);
 
 // Website
-define('WEBSITE_DOMAIN', '');
+define('WEBSITE_DOMAIN', 'http://' . $_SERVER['HTTP_HOST']);
 
 // Database
 define('DB_NAME', 'database.sqlite');