FeedBurner Error

From last few months I am thinking to have a FeedBurner account for my blog, but as I am not a frequent blogger, so I droped the idea, but today I decided to have the one.

I signed up the FeedBurner by using my Google Account, it works (:-) FeedBurner is now Google service).

I got my FeedBurner URL as
http://feeds.feedburner.com/deepaksyadav

as being my hobby to play with the URLs by applying some injections into the same, I tried lot of things, finally I decided to see what happen if no ID is passed to the URL so I typed:
http://feeds.feedburner.com/

and expected to see the homepage for Feed or a welcome page, but I got the HTTP Status 400 error generated by Apache Tomcat/5.0.28, bang quite interesting, see the pic(below).