$ENV{HTTP_REFERER} is used for that purpose, IIRC. Don't rely on it too much though, since it can be faked, or left out completely.

Update: To be honest, I have never heard of anything like $ENV{REDIRECT...} variables with Apache :(

--
B10m

In reply to Re: can't get value of $ENV{REDIRECT_URL} by b10m
in thread can't get value of $ENV{REDIRECT_URL} by Anonymous Monk

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