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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_AUTOREFERER
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_EFFECTIVE_URL (3)
+  - CURLINFO_REDIRECT_URL (3)
+  - CURLINFO_REFERER (3)
+  - CURLOPT_FOLLOWLOCATION (3)
+  - CURLOPT_REFERER (3)
+---
+
+# NAME
+
+CURLOPT_AUTOREFERER - automatically update the referer header
+
+# SYNOPSIS
+
+~~~c
+#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
+
+HTTP
+
+# EXAMPLE
+
+~~~c
+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
+
+Along with HTTP
+
+# RETURN VALUE
+
+Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.