Support 404 routes in the Ember App

app/controllers/exceptions_controller.rb

@@ -6,4 +6,13 @@ class ExceptionsController < ApplicationController
     raise Discourse::NotFound
   end
 
+  # Give us an endpoint to use for 404 content in the ember app
+  def not_found_body
+
+    # Don't show google search if it's embedded in the Ember app
+    @hide_google = true
+
+    render text: build_not_found_page(200, false)
+  end
+
 end