public function addSecondaryDnsDomains($domain, $domain2add, $ip){
        $domain = (string)$domain;
        if (!$domain)
            throw new BadMethodCallException('Parameter $domain is missing.');
        $domain2add = (string)$domain2add;
        if (!$domain2add)
            throw new BadMethodCallException('Parameter $domain2add is missing.');
        $ip = (string)$ip;
        if (!$ip)
            throw new BadMethodCallException('Parameter $ip is missing.');
        $payload = array("domain"=>$domain2add, "ip"=>$ip);
        try {
            $r = $this->post('dedicated/server/'.$domain.'/secondaryDnsDomains', array('Content-Type' => 'application/json;charset=UTF-8'), json_encode($payload))->send();
        } catch (\Exception $e) {
            throw new ServerException($e->getMessage(), $e->getCode(), $e);
        }
    }