Well, the good news is that there's nothing inherently wrong with your code because I have downloaded and run it and it works fine (in the sense that there are no SSL errors and it retrieves a page of HTML from the server). So the bad news is that there's something in your environment which is causing the problem. I'd be looking at your versions of openssl, IO::Socket::SSL and (unlikely but still worth a check) Mozilla::CA for starters. Are they all up to date?

(updated for clarity in the light of marto's 404 report)