Ugh, sorry for the broken link, I even pasted the same string into a new tab to make sure it worked because I thought the period at the end looked weird, and it was fine. Dunno how it got mangled.
[EDIT] Oh man, yours is like that too? WTF.
[EDIT2] If I follow your link, hit the 404 page, then add a period at the end of the URL, it does load. God that's strange.
Did you edit it to fix it? Is HN refusing to include the period as part of the URL?
Well, we ended up on the same page in any case, in at least one sense.