proxied remote_host how to ? 2005-04-19 - By Joshua Slive
On 4/19/05, Ezio Paglia <ezio@(protected)> wrote:
> >Look in the environment variable X_Forwarded_For.
>
> if the request passes through a chain of proxies what does it happen to
> such variabile ?
Depends on the proxies. I believe that if apache is the last proxy,
it will remove any previous values and write the IP address of the
last proxy in X-Forwarded-For. There is no general way to tell the
original client's IP address. It all depends on the proxies involved.
> In order to leave intact the application on the backup server, could we use
> a setenv mechanism on the backend server, in order to rewrite the
> remote_addr variable with the x_forwarded_for variable ?
No. This would require a custom apache module. (It probably wouldn't
be too complicated, but you would need to be very careful about
security issues.)
Joshua.
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