CURLOPT_REFERER − set the HTTP referer header
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REFERER, char *where);
Pass a pointer to a null-terminated string as parameter. It will be used to set the Referer: header in the http request sent to the remote server. This can be used to fool servers or scripts. You can also set any custom header with CURLOPT_HTTPHEADER(3).
The application does not have to keep the string around after setting this option.
CURL *curl =
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
/* tell it
where we found the link to this place */
curl_easy_setopt(curl, CURLOPT_REFERER, "http://example.com/aboutme.html");
If built with HTTP support
Returns CURLE_OK if HTTP support is enabled, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.