HTTP Headers

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I have been trying to find out how to get the HTTP headers of files and
I just can't find any documentation on it.  This is the code I have
right now..

$url = "http://www.web-consult.com/";

use LWP::UserAgent;
use URI::URL;

$ua = new LWP::UserAgent;
$ua->agent("TestBot/0.4");
$ua->env_proxy;
$request = new HTTP::Request('GET',$url);
$response = $ua->request($request);

How do I slip in the code so that I can get the http headers of that
file too, particularly the file content-length.

Thanks,
David Tsai

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