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if ($modx->event->name == 'OnLoadWebDocument') {
	$uri = $_SERVER['REQUEST_URI'];
	if ($modx->resource->isfolder && substr($uri, -1) != '/' && !strpos($uri, '?')) {
		$modx->sendRedirect($modx->makeUrl($modx->resource->id),array('responseCode' => 'HTTP/1.1 301 Moved Permanently'));
	}
}