I'm making a couple of dangerous assumptions: Assumption 1: You are using LWP::UserAgent and not LWP::Simple. Following from that assumption, I must assume (based upon your message) that you know how to use LWP::UserAgent to perform an HTTP::Request on a given URL, and are able to use HTTP::Response returned from your request to get your data. From here it gets pretty easy:

print $response->headers_as_string;
[download]

This is documented in HTTP::Response. I'd also take a glance at HTTP::Headers.