You can use frameset, so the top-level frameset is in the domain that appears in the address bar, and the only frame loads a page from the actual source. For example (this would go in the index page for the cloaking domain):
<frameset>
<frame src=”http://actual-url.example.com/page.html”>
</frameset>
But, if frames are not supported by your browser, it will appears the [...]