How do i create a url that returns a 204
<p>I am trying to use the i frame  buster buster code but i need to use a 204 url. How do i create page that gives of a 204 no content error so that this iframe bustter buster code works</p>

<pre><code>&lt;script type="text/javascript"&gt;?

var prevent_bust = 0;?
window.onbeforeunload = function() { prevent_bust++; }?
setInterval(function() {?
    if (prevent_bust &gt; 0) {  ?
        prevent_bust -= 2;?
        window.top.location = 'http://domain.com';?
    }  ?
}, 1);?
&lt;/script&gt;
</code></pre>

<p>in the <code>window.top.location =</code> 
i am suppose to a 204 url so how do i create one</p>