How do I get referer?

I'd like to get the "referer" header so I can tell users to get back to the referring page. Search this forum for "referer", and a number of "helpful" posts tell something like this:

<h:outputLink value="#{header['Referer']}">

<h:outputText value="Click here to go back!"/>

</h:outputLink>

Makes sense, but it doesn't work. The link's href is blank. Similarly, calling

referer = external.getRequestHeaderMap().get("Referer");

yields null. Who is eating the referer, and how can I get it?

Thanks,

Cay

[578 byte] By [cayhorstmanna] at [2007-11-26 17:14:03]