How can I determine if a URL redirects?

use LWP::UserAgent;
my $ua = LWP::UserAgent->new;

my $request  = HTTP::Request->new( GET => 'http://google.com/' );
my $response = $ua->request($request);
if ( $response->is_success and $response->previous ) {
    print $request->url, ' redirected to ', $response->request->uri, "n";
}

$ telnet www.google.com 80
HEAD / HTTP/1.1
HOST: www.google.com


HTTP/1.1 302 Found
Location: http://www.google.it/
Cache-Control: private
Content-Type: text/html; charset=UTF-8
Set-Cookie: ##############################
Date: Thu, 30 Oct 2008 20:03:36 GMT
Server: ####
Content-Length: 218

URL url = new URL ('http://google.com')
HttpURLConnection conn = url.openConnection()
conn.followRedirects = false
conn.requestMethod = 'HEAD'
println conn.responseCode
// Not ideal - should check response code too
if (conn.headerFields.'Location') {
  println conn.headerFields.'Location'
}

301
["http://www.google.com/"]

use LWP::UserAgent;
my $ua = LWP::UserAgent->new;

my $request  = HTTP::Request->new( GET => 'http://google.com/' );
my $response = $ua->request($request);
if ( $response->is_redirect  ) {
    print $request->url . " redirected to location " .  $response->header('Location') .  "n";
}