Rails - Sep 2008 - How does the sub-domain like urls are created in web apps?

Hello,
     I registered in a site called basecamp. After I registered, they
gave me a url like http://xxx.basecamp.com where i have to log in access
my project management. I heard that basecamp is built in ruby on rails.
I couldn''t get the point of building a subdomain like url. Can anyone
give some guidance of how to create a sub domain like url using rails?
Thanks in advance
-- 
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You can use subdomains for various purposes. One is to host different
servers (eg mail.example.com and www.example.com), or to host
different applications (eg blog-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org and
forum-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org).

I believe Basecamp use it to have nicer URLs. The standard way would
be:
//www.example.com/~rockroll/..., or
//www.example.com/...?user_id=123456

//rockroll.example.com/... looks nicer.

A few links:
http://wiki.rubyonrails.org/rails/pages/HowToUseSubdomainsAsAccountKeys
http://www.jonathansng.com/ruby-on-rails/find-your-rails-subdomains/http://www.railsonwave.com/railsonwave/2007/7/10/howto-put-a-controller-under-a-ssl-subdomain

Christian

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