function createFolder($path)
    {
        Path::checkArgNonRoot("path", $path);

        $response = $this->doPost(
            $this->apiHost,
            "1/fileops/create_folder",
            array(
                "root" => "auto",
                "path" => $path,
            ));

        if ($response->statusCode === 403) return null;
        if ($response->statusCode !== 200) throw RequestUtil::unexpectedStatus($response);

        return RequestUtil::parseResponseJson($response->body);
    }