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.

With CURLINFO_REFERER(3), applications can extract the actually used referer header after the transfer.

DEFAULT¶

0, disabled

PROTOCOLS¶

This functionality affects http only

EXAMPLE¶

int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode res;


    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);


    res = curl_easy_perform(curl);


    curl_easy_cleanup(curl);


  }
}

AVAILABILITY¶

Added in curl 7.1

RETURN VALUE¶

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

SEE ALSO¶

CURLINFO_EFFECTIVE_URL(3), CURLINFO_REDIRECT_URL(3), CURLINFO_REFERER(3), CURLOPT_FOLLOWLOCATION(3), CURLOPT_REFERER(3)