Another very simple way to fork processes using LWP is by using Parallel::ForkManager. It's shockingly simple to make your code parallel in this way, here's how you could apply it to the loop in your code:

use Parallel::ForkManager
my $max_forks = 20;

my $forkmanager = Parallel::ForkManager->new( $max_forks );
for ($count = 0; $count <= $max; $count++){
    $forkmanager->start and next;
    my $content;
    unless (defined ($content = get $URL)) {
       die "could not get $URL\n";
    }
    if ($content =~ /Test1/i) {
        print ".";
    }
    elsif ($content =~ /Test2/i) { 
        print "Fetched page from Server2 \n";
        $count++;
        &result;
    }
    else { print "Page not retreived \n" };
    $forkmanager->finish;
}

$forkmanager->wait_all_children;
[download]

This testing is also probably dependent on the maximum number of clients you support, this may not be high enough to stress your gateway either. Check on the MaxClients parameter in your httpd.conf for more information. Depending on what you're testing, it may be fruitful to use LWP to download larger files rather than making more requests.

Best of luck. :)