I am recently working on some cookie related stuff, and made a small tool for myself. maybe it would help you in some way.

This tool captures html packets, and is capable to extra Set-Cookies.

To use it just make your browser point to this script as a proxy: localhost, 8080. This script requires one parameter to specify action, "r" for recording, and "d" for extract cookies. You can add more function, actually I just started with it yesterday, and will add more functions, if you are interested, I can send you a new version next week, or I can post it somewhere on perlmonks.

browser(user agent) <==> script <==> server

use IO::Socket::INET;

use strict;

my $action = $ARGV[0];

my $old_cookies = {};
my $new_cookies = {};

my $client = new IO::Socket::INET(Proto => "tcp",
                                  LocalPort => 8080,
                                  Listen => 10,
                                  Reuse => 1,
                                  Timeout => 2000) || die "failed";
if ($action eq "r") {
    while (1) {
        my $c = $client->accept();
        my $request = get_request($c);
        logmsg($request."\n");
        my $response = get_response($request);
        logmsg($response."\n");
        print $c $response;
        close($c);
    }
}

if ($action eq "d") {
    my $request_file;
    open($request_file, "<", "result");
    while (<$request_file>) {
        get_cookie($_, $old_cookies);
    }
    close($request_file);
}


sub get_response {
    my ($request, $new_cookies) = @_;
    my $s = new IO::Socket::INET(Proto => "tcp",
                                 PeerPort => 8080,
                                 PeerAddr => "yourrealproxy")#set this
+ to your real proxy
            || die "failed to connect to ofg\n";
    print $s $request;
    my $response = "";
    my $piece;
    while (1) {
        sysread($s, $piece, 1000);
        $response .= $piece;
        last if ($piece eq "");
    };
    close($s);
    my @lines = split(/\r\n\r\n/, $response);
    @lines = split(/\r\n/, $lines[0]);
    foreach my $line (@lines) {
        get_cookie($line, $new_cookies);
    }
    return $response;
}

sub get_request {
    my $c = shift;
    my $piece;
    my $request = "";
    do {
        sysread($c, $piece, 1000);
        $request .= $piece;
    } until ($request =~ m/\r\n\r\n$/);
    return $request;
}

sub get_request_from_file {
    my ($request_file, $old_cookies) = @_;
    my $request = "";
    my $found = 0;
    while (<$request_file>) {
        if (!$found) {
            if (m/^GET/) {
                $found = 1;
                $request .= $_;
            } else {
                get_cookie($_, $old_cookies);
            }
        } else {
            $request .= $_;
            last if (m/^\r\n$/);
        }
    }
    return $request;
}

sub logmsg {
    my $log = shift;
    my $result_file;
    open($result_file, ">>", "result");
    print $result_file $log;
    close($result_file);
}

sub get_cookie {
    my ($response, $cookie_hash) = @_;
    $response =~ m/Set-Cookie:\s*(.*?)=(.*?)[;]/i;
    if ($1 && $2) {
        print "[$1, $2]\n";
        $cookie_hash->{$1} = $2;
    }
}
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