protected function extractCustomParams(array $params = array())
    {
        foreach ($params as $name => $values) {
            foreach ($this->services as $host => $service) {
                if (preg_match('~' . preg_quote($name, '~') . '~i', $service)) {
                    $this->customParams[$host] = (array) $values;
                }
            }
        }
    }