Use of Referer header

[Paul Taylor]

I have a WebPage which can be called from two different webpages, and I 
wanted it to have a back button.

Originally I had the calling pages passing a parameter to tell the 
called page what called it. Then someone pointed
out <%=request.getHeader("REFERER")%> to m. This works much better.

But I have 2 questions:
1. Where are these header values defined I've not beeen able to find a 
good source.
2.  It worked when coming from my pages but I then tried going to 
another page (e.g www.sun.com) and then pasting in the url and it just 
returned null. Does referer only apply when hyperlink from another  page ?

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