Resolved OSX Lion web sharing the computer name does not work

Hi there,
I have enabled the web sharing on preferences panel and set my computer name as Xserver01 or something but when I click the url it provided like "http://xserver01" on the panel, the safari says it can not find the server.
I just typed http://localhost and it works perfectly.
What should I do to fix this problem?
thank you so much

thanks a lot. I thought osx would set up it automatically.