$ lwp-request -uUsSed http://perlmonks.org/images/vroom_sm.gif
GET http://perlmonks.org/images/vroom_sm.gif
User-Agent: lwp-request/6.03 libwww-perl/6.08

200 OK
Connection: close
Date: Tue, 17 Feb 2015 00:32:01 GMT
Accept-Ranges: bytes
ETag: "a0f-39863fd7ace00"
Server: Apache/2.2.29
Content-Length: 2575
Content-Type: image/gif
Last-Modified: Fri, 25 Jan 2002 17:35:52 GMT
Client-Date: Tue, 17 Feb 2015 00:33:52 GMT
Client-Peer: 66.39.54.27:80
Client-Response-Num: 1


$ perl -MLWP::Simple=$ua -e " print $ua->get( q{http://perlmonks.org/images/vroom_sm.gif})->header(q{Content-Length}) "
2575