curl_easy_setopt (st->curl, CURLOPT_WRITEFUNCTION, apache_curl_callback);
curl_easy_setopt (st->curl, CURLOPT_WRITEDATA, st);
curl_easy_setopt (st->curl, CURLOPT_WRITEFUNCTION, apache_curl_callback);
curl_easy_setopt (st->curl, CURLOPT_WRITEDATA, st);