.\" generated by cd2nroff 0.1 from CURLOPT_AUTOREFERER.md
.TH CURLOPT_AUTOREFERER 3 "2024-07-29" libcurl
.SH NAME
CURLOPT_AUTOREFERER \- automatically update the referer header
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_AUTOREFERER, long autorefer);
.fi
.SH 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 \fICURLINFO_REFERER(3)\fP, applications can extract the actually used
referer header after the transfer.
.SH DEFAULT
0, disabled
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR CURLINFO_EFFECTIVE_URL (3),
.BR CURLINFO_REDIRECT_URL (3),
.BR CURLINFO_REFERER (3),
.BR CURLOPT_FOLLOWLOCATION (3),
.BR CURLOPT_REFERER (3)