With Ember.js the routing framework is client-side and Ember.js stores all dynamic values in the URL fragment. The server doesn't see enough information to render a page, even if you were willing in theory to duplicate your rendering logic server-side.
You can use HTML5 pushState in Ember.js [1] and Backbone so application state is captured in actual URL path instead of URL location hash. The server can see enough information to render a page.
