curl_easy_setopt(cb->curl, CURLOPT_HTTPHEADER, cb->headers);
curl_easy_setopt(cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
curl_easy_setopt(cb->curl, CURLOPT_HTTPHEADER, cb->headers);
curl_easy_setopt(cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);