public function mkdirWithInOrderKey($dir, $ttl = 0)
    {
        $data = array(
            'dir' => 'true'
        );

        if ($ttl) {
            $data['ttl'] = $ttl;
        }
        $request = $this->guzzleclient->post(
            $this->buildKeyUri($dir),
            null,
            $data
        );

        $response = $request->send();
        $body = $response->json();

        return $body;
    }