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From Ian Stuart <>
Subject RE: [users@httpd] Block Frontpage from grabbing site
Date Tue, 22 Oct 2002 11:33:36 GMT
On Tue, 2002-10-22 at 10:23, Boyle Owen wrote:
> The purpose of the WWW is for servers to deliver files to clients. The
> only thing you know authoritatively about the client is his IP address -
> and that is an ephemeral thing which constantly changes.
Even this may be wrong....

Almost all web-caches/proxies reset the REMOTE_ADDR variable to be
themselves (which is, of course, correct - technically :)

With Apache 2 servers (and there is a patch for Apache 1), the proxy can
set an X_FORWARDED_FOR_ADDR variable, however this is just a list of the
current X_FORWARDED_FOR_ADDR with the proxies client REMOTE_ADDR

(Yes, it does make life ... harder.)

Ian Stuart: Edinburgh University Data Library.

Information is not knowledge
Knowledge is not wisdom
Wisdom is not truth
Truth is not beauty
Beauty is not love
Love is not music
              -- Mary.

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