<input type="hidden" name="perlquestion_doctext" value=1> Hi,

I'm testing an application that runs behind a lightweight Apache as a proxy, and I need to give it different IPs as part of the testing regimen to exercise the Geotargetting part of the application. So to live test the application, I wrote live test harness where I can put different parameters like the referrer url, the remote ip, etc into form widgets, and puts that all into the location of an IFRAME when I submit the form.

Then I used HTTP::Proxy and HTTP::Proxy::HeaderFilter to strip the referer URL and IP address from the query string, and to attach them to the request object as the 'Referer' and 'X-Forwarded-For' headers instead: 

package EngineTestFilter;
use base qw/HTTP::Proxy::HeaderFilter/;

use strict;
use warnings;

sub filter {
  my ($self, $headers, $request) = @_;

  my $uri = $request->uri();
  my ($location, $query) = split(/\?/, $uri);
  
  my %params = map { split /=/ } map { split /&/ } $query;

  $request->uri($location  .'?'.join('&', map { "$_=$params{$_}" } qw/
+a s/));
  $headers->header(Referer => $params{referer});
  $headers->remove_header('X-Forwarded-For');
  $headers->header('X-Forwarded-For' => $params{remote_ip});
}

[download]
Unfortunately, the IP address ends up at the beginning of the 'X-forwarded-For' header, and not the end: 
  'X-Forwarded-For' => '207.177.71.108, 10.0.0.50, 10.0.0.50',

[download]
I hunted up though the chain of inheritance all the way up to HTTP::Message, and I could not find where the 'X-Forwarded-For' header gets handled in all of that.

Anyone got a cluestick for me?

In reply to HTTP::Proxy and X-Forwarded-For headers by cleverett

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