curl / libcurl / API / curl_easy_setopt / CURLOPT_AUTOREFERER

CURLOPT_AUTOREFERER explained

Name

CURLOPT_AUTOREFERER - automatically update the referer header

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_AUTOREFERER, long autorefer);

Description

Pass a long parameter set to 1 to enable this. When enabled, libcurl automatically sets the Referer: header field in HTTP requests to the full URL when it follows a Location: redirect to a new destination.

The automatic referer is set to the full previous URL even when redirects are done cross-origin or following redirects to insecure protocols. This is considered a minor privacy leak by some.

Default

0, disabled

Protocols

HTTP

Example

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
 
  /* follow redirects */
  curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 
  /* set Referer: automatically when following redirects */
  curl_easy_setopt(curl, CURLOPT_AUTOREFERER, 1L);
 
  ret = curl_easy_perform(curl);
 
  curl_easy_cleanup(curl);
}

Availability

Along with HTTP

Return value

Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.