a bot accessed a hidden url

I'm curious and perhaps somebody can help.
I was testing a new controller on the site yesterday using a url which does not appear anywhere on any page "ecoland.com/try/this". Lo and behold, shortly after midnight the same url was called by "bing.com/bingbot.htm". My question is: how could bingbot even be aware of the url. I only implemented it yesterday for a few hours and it never appears on any page so a screenscraper cannot have stumbled across it.
Thanks, Bill