protected function completeServerInfos(array &$infos)
    {
        $infosKeyDefaultValues = [
            'host'   => null,
            'port'   => null,
            'weight' => 0
        ];
        
        foreach ($infosKeyDefaultValues as $infosKey => $defaultValue) {
            if (!isset($infos[$infosKey])) {
                $infos[$infosKey] = $defaultValue;
            }
        }
    }