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I have a strange problem detecting hotlinking using .htaccess with IIS.

I check to see if the referrer linking to my images contains mydomain.com. So, if the
referrer is mydomain.com/page.asp, I allow the connection.

BUT - sometimes the referrer does not contain the domain name and is:
/page.asp

First of all, I didn't know that a referrer could NOT contain a domain name. Second, how
is this done - is this a legit link to my image or is it a trick?