CURLOPT_HEADERDATA - pointer to pass to header callback
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);
Pass a pointer to be used to write the header part of the received data to.
If CURLOPT_WRITEFUNCTION or CURLOPT_HEADERFUNCTION is used, pointer will be passed in to the respective callback.
If neither of those options are set, pointer must be a valid FILE * and it will be used by a plain fwrite() to write headers to.
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