On Friday 03 August 2007 12:29, Jen mlists wrote:
> I meet a problem about getting client's original IP.
> Some clients use proxy servers to access our sites,and I need to get
> their original IPs instead of proxy servers' IPs.
>
> In CGI I can write it like:
>
> my $ip = $ENV{'HTTP_X_FORWARDED_FOR'} ? $ENV{'HTTP_X_FORWARDED_FOR'} :
> $c->remote_ip;
This idea won't work in general. First, not all proxies set an X-Forwarded-For
header. Second, many proxies sit in front of private networks 10.0.0.0/8 or
172.16.0.0/16 or 192.168.0.0/16 or 127.0.0.0/8. If they set the header you
get different clients with the same IP-address. Also, be aware that a request
can travel through multiple proxies. Thus, you can get multiple
X-Forwarded-For headers.
That said, you can access all incoming headers via
$r->headers_in->{$header_name}.
Torsten
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