Is this running from a CGI script? I do get a page, and it's a frameset. That would look blank viewed in a web browser, because the the frames are specified using relative links.

If you mean that the $html string is literally empty, try adding the line

use LWP::Debug;
[download]

before the get() call. You'll get a detailed trace of what LWP is doing, which should help you to diagnose the problem.