How-to Pretty URLs with Subdomain using mod_rewrite, request routing plugin

Does Rails 1.2 (EDGE) provide a native way to work seamlessly with subdomains? For example, I would like the following incoming request to be routed to the corresponding controller/action:   http://sub1.domain.com/show => (:controller => sub1, :action => show)

I have been able to accomplish this using the "Request Routing" plugin by specifying a subdomain condition.   map.connect 'show', :controller => 'sub1', :action => 'show', :conditions => {:subdomain => 'sub1'}

My first problem/question is will I have to map each action of a subdomain/controller. Is there an easier way, possibly a one-liner?

My second problem is with the URLs generated by url_for and link_to once the request has been directed to the correct controller/action. How can one reverse the process? For example:   url_for(:controller => sub1, :action => show) => http://sub1.domain.com/show

I also tried using Lighttpd's mod_rewrite, but can't get it to work either. When using the following config, rails routing cannot find route, essentially the rewritten URL is not given to rails. For example, when I request:   http://sub1.domain.com:3000/show, Rails outputs the following:

no route found to match "/show" with {:domain=>"domain.com", :request_uri=>"/show", :protocol=>"http://", :accept s=>"text/html,text/plain,text/sgml,video/mpeg,image/jpeg,image/tiff,image/x-rgb,image/png,image/x-xbitmap,imag e/x-xbm,image/gif,application/postscript,*/*", :remote_ip=>"10.0.9.36", :method=>:get, :content_type=>nil, :po rt=>3000, :subdomain=>"sub1"}

Any pointers will be greatly appreciated. Here is the relevant section from config/lighttpd.conf:

$HTTP["host"] =~ "^(.+)\.domain\.com$" {   fastcgi.server = (".fcgi" =>      ( "localhost" =>       ( "min-procs" => 1,         "max-procs" => 1,         "socket" => CWD + "/tmp/sockets/fcgi.socket",         "bin-path" => CWD + "/public/dispatch.fcgi",         "bin-environment" => ( "RAILS_ENV" => "development" )       )      ))   url.rewrite-once = ( "^(.*)$" => "/%1/$1" ) }

-pachl