CURLOPT_REFERER man page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REFERER, char *where);

Pass a pointer to a zero 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.

NULL

HTTP

CURL *curl = curl_easy_init();
if(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");

  curl_easy_perform(curl);
}

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.

CURLOPT_USERAGENT(3), CURLOPT_HTTPHEADER(3),

curl_easy_setopt(3), CURLOPT_AUTOREFERER(3), CURLOPT_HTTPHEADER(3), CURLOPT_USERAGENT(3).