CURLOPT_REFERER(3) - Man pages

CURLOPT_REFERER(3)          Library Functions Manual         CURLOPT_REFERER(3)

NAME
       CURLOPT_REFERER - the HTTP referer header

SYNOPSIS
       #include <curl/curl.h>

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

DESCRIPTION
       Pass  a  pointer to a null-terminated string as parameter. It is used to
       set the Referer: header field in the HTTP request  sent  to  the  remote
       server. You can set any custom header with CURLOPT_HTTPHEADER(3).

       The  application  does  not have to keep the string around after setting
       this option.

       Using this option multiple times makes the last set string override  the
       previous ones. Set it to NULL to disable its use again.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects http only

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* tell it where we found the link to this place */
           curl_easy_setopt(curl, CURLOPT_REFERER, "https://example.org/me.html");

           curl_easy_perform(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).

SEE ALSO
       CURLINFO_REDIRECT_URL(3),  CURLINFO_REFERER(3),   CURLOPT_HTTPHEADER(3),
       CURLOPT_USERAGENT(3)

libcurl                            2026-07-12                CURLOPT_REFERER(3)

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