Ofcourse the Referer HTTP header is not obligatory for the browser to set, and even in some circumstances it is should not be set:
Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
from rfc2616.
In reply to Re: can't get $ENV{HTTP_REFERER}
by zby
in thread can't get $ENV{HTTP_REFERER}
by perlmania
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