CURLOPT_STDERR - redirect stderr to another stream
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STDERR, FILE *stream);
Pass a FILE * as parameter. Tell libcurl to use this stream instead of
stderr when showing the progress meter and displaying
CURLOPT_VERBOSE(3) data.
If you are using libcurl as a win32 DLL, this option will cause an
exception and crash in the library since it cannot access a FILE * passed on
from the application. A work-around is to instead use
CURLOPT_DEBUGFUNCTION(3).
CURL *curl = curl_easy_init();
FILE *filep = fopen("dump", "wb");
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_STDERR, filep);
curl_easy_perform(curl);
}
CURLOPT_VERBOSE(3), CURLOPT_NOPROGRESS(3),
CURLOPT_DEBUGFUNCTION(3)