Http_x_forwarded_for

Applications

[Damian]

I just started implementing
$ENV{'HTTP_X_FORWARDED_FOR'}
in my logging scripts. It seems very useful to get the original ip from visitors behind a proxy.

I wonder I anybody has been using this in cloaking scripts, and if well known spiders were ever found hiding behind a proxy ?

[littleman]

So far I haven't seen any search engine bot doing this, of course if they were looking to bust cloaks they would probably use a proxy that isn't set to sent X_FORWARDED header. Another variation is HTTP_FORWARDED -- $ENV{'HTTP_FORWARDED'} for your perl script.