protected function send(\Zend\Http\Client $client)
    {
        try {
            $response = $client->send();
        } catch (\Zend\Http\Client\Exception\RuntimeException $e) {
            throw new Exception\RuntimeException(
                sprintf('Zend HTTP Client exception: %s', $e),
                -1,
                $e
            );
        }
        return $response;
    }