curl_easy_setopt (_curl, CURLOPT_WRITEFUNCTION, write_callback_wrapper);
curl_easy_setopt (_curl, CURLOPT_WRITEDATA, this);
curl_easy_setopt (_curl, CURLOPT_TIMEOUT, 20);
curl_easy_setopt (_curl, CURLOPT_WRITEFUNCTION, write_callback_wrapper);
curl_easy_setopt (_curl, CURLOPT_WRITEDATA, this);
curl_easy_setopt (_curl, CURLOPT_TIMEOUT, 20);