Question

I’m looking for a simple script that I can use to null the referer

An example would be:

http://www.refnull.com/

Does anybody know how to null the referer in php or javascript? I don’t mind either way, preferable not using any database.

So they go to http://www.examplesite.com/link.php?http://whateverlinktonull.com

Answer 1

The way that refnull.com does it is the following (you can figure this out by using a tool like Fiddler2 for windows):

---

Request 1 content:

<meta http-equiv="refresh" content="0; url=http://www.refnull.com/?http://www.whatismyreferer.com/&attempt=1">

..which redirects you to request 2:

---

Request 2 content:

<script>
    function go(){
        window.frames[0].document.body.innerHTML='<form target="_parent" method="post" action="http://www.refnull.com/?http://www.whatismyreferer.com/&attempt=1&attempt=2"></form>';
        window.frames[0].document.forms[0].submit()
    }   
</script>
<iframe onload="window.setTimeout('go()', 99)" src="about:blank" style="visibility:hidden"></iframe>

..which redirects to request 3:

---

Request 3 “content”:

A HTTP/1.1 302 Found header that can be done with the following PHP:

header("HTTP/1.1 302 Found");
header("Location: http://www.whatismyreferer.com/");
die();

..which redirects you to the external site.