private function callLocateHTTPServerHook()
    {
        if (is_string(self::$locateHTTPServerHook)) {
            ${self::$locateHTTPServerHook}($this->nb_http_server);
        } elseif (self::$locateHTTPServerHook instanceof Closure) {
            (self::$locateHTTPServerHook)($this->nb_http_server);
        }
    }