Rails - Jun 2006 - map lighttpd to specific action?

I have a multi-city application set up and right now the city is set by 
a session variable:

            if @user.city.to_s==''3''
                 session[:city]="nyc"
                redirect_to(:controller => "users", :action => 
"nycindex")


Is it possible to map a specific URL to that same action? e.g. 
ny.foo.com would set @user.city.to_s == ''3'' and so head over
to the
users/nycindex page?

Can that be on in lighttpd or is there another way to look for it?

Thanks..

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