miss routing ajax request

[old-grrt]

XMLHttpRequests are being miss routing, any idea way?

GET http://sd.mydomain.com/categories/1 routed properly.
(SD::CategoriesController < SDApplicationController)

new Ajax.Request('http://sd.mydomain.com/categories/1', {asynchronous:true, evalScripts:true, method:'get'...
routed to ApplicationController#index

Also I got

ActionController::MethodNotAllowed (Only get, put, and delete requests are allowed.):
which does not make much sense since its set as get request.

My routes

map.subdomain :sd do |sd|
sd.resources :categories, :controller => "sd/categories"
end
map.resource :categories

Am i doing something wrong, is it a bug or a constraint?

I appreciate any insights

subdomain-fu 0.5.4
rails 2.3.8
ruby 1.8.7