Tribblix: manual page: CURLOPT

CURLOPT_AUTOREFERER(3) Introduction to Library Functions

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

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).