$req->content_type('application/whatever-pdf-mimetype-is');

##</code><code>##

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

	 my $req = HTTP::Request->new(GET =>
	    'http://full-url-you-want-or-are-requesting');
# following line defines what will be saved to your machine
	 $res = $ua->request($req, "html-filename-dot-html-part--index-dot-html-for-example");
	 if ($res->is_success) {
	    print "ok\n";
	 }
	 else {
	    print $res->status_line, "\n";
	 }