Move middlewares to the Application level. If you want to modify the...

Move middlewares to the Application level. If you want to modify the middleware, either use Rails.application.config.middleware or modify it in an initializer (if you need to set it relative to user-specified middleware).

railties/lib/rails/application/configuration.rb

@@ -21,6 +21,10 @@ def initialize(*)
         @consider_all_requests_local = true
       end
 
+      def middleware
+        @@default_middleware_stack ||= default_middleware
+      end
+
       def paths
         @paths ||= begin
           paths = super

railties/lib/rails/railtie/configuration.rb

@@ -10,10 +10,6 @@ def initialize
         @session_options = {}
       end
 
-      def middleware
-        @@default_middleware_stack ||= default_middleware
-      end
-
       # Holds generators configuration:
       #
       #   config.generators do |g|