if ($request->hasHeader('ssl_key')) {
            curl_setopt($handle, CURLOPT_SSLKEY, $request->getHeader('ssl_key')[0]);

            if ((bool) ($request->getHeader('ssl_key')[1] ?? false)) {
                curl_setopt($handle, CURLOPT_SSLKEYPASSWD, $request->getHeader('ssl_key')[1]);