Sending a referrer is entirely up to the browser/system - most home firewall
software will prevent referrers from being sent for example.

You really should never use referrer as security mechanism it's just not
reliable enough.

Jim Davis

I am trying to check the CGI.HTTP_REFERER variable to keep outside sites
from submitting forms; however, I have seen some strange things.  The same
form on one computer when the form is submitted will have data in
CGI.HTTP_REFERER and on another computer, CGI.HTTP_REFERER is blank.  Any
ideas of what might cause this?  Are there certain settings in a browser
that might cause this?
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