Move AD::Cascade to the bottom of the middleware stack.

railties/lib/rails/application/configuration.rb

@@ -150,10 +150,10 @@ module Rails
           middleware.use('::ActionDispatch::Cookies')
           middleware.use(lambda { session_store }, lambda { session_options })
           middleware.use('::ActionDispatch::Flash', :if => lambda { session_store })
-          middleware.use(lambda { metal_loader.build_middleware(metals) }, :if => lambda { metal_loader.metals.any? })
-          middleware.use('ActionDispatch::ParamsParser')
+          middleware.use('::ActionDispatch::ParamsParser')
           middleware.use('::Rack::MethodOverride')
           middleware.use('::ActionDispatch::Head')
+          middleware.use(lambda { metal_loader.build_middleware(metals) }, :if => lambda { metal_loader.metals.any? })
         end
       end
     end

railties/lib/rails/configuration.rb

@@ -5,6 +5,37 @@ require 'rails/rack'
 
 module Rails
   module Configuration
+    class MiddlewareStackProxy #:nodoc:
+      def initialize
+        @operations = []
+      end
+
+      def insert_before(*args, &block)
+        @operations << [:insert_before, args, block]
+      end
+
+      alias :insert :insert_before
+
+      def insert_after(*args, &block)
+        @operations << [:insert_after, args, block]
+      end
+
+      def swap(*args, &block)
+        @operations << [:swap, args, block]
+      end
+
+      def use(*args, &block)
+        @operations << [:use, args, block]
+      end
+
+      def merge_into(other)
+        @operations.each do |operation, args, block|
+          other.send(operation, *args, &block)
+        end
+        other
+      end
+    end
+
     class Generators #:nodoc:
       attr_accessor :aliases, :options, :templates, :fallbacks, :colorize_logging
 

railties/lib/rails/railtie/configuration.rb

@@ -3,37 +3,6 @@ require 'rails/configuration'
 module Rails
   class Railtie
     class Configuration
-      class MiddlewareStackProxy
-        def initialize
-          @operations = []
-        end
-
-        def insert_before(*args, &block)
-          @operations << [:insert_before, args, block]
-        end
-
-        alias insert insert_before
-
-        def insert_after(*args, &block)
-          @operations << [:insert_after, args, block]
-        end
-
-        def swap(*args, &block)
-          @operations << [:swap, args, block]
-        end
-
-        def use(*args, &block)
-          @operations << [:use, args, block]
-        end
-
-        def merge_into(other)
-          @operations.each do |operation, args, block|
-            other.send(operation, *args, &block)
-          end
-          other
-        end
-      end
-
       def initialize
         @@options ||= {}
       end
@@ -44,7 +13,7 @@ module Rails
       # application once it is defined and the default_middlewares are
       # created
       def app_middleware
-        @@app_middleware ||= MiddlewareStackProxy.new
+        @@app_middleware ||= Rails::Configuration::MiddlewareStackProxy.new
       end
 
       # Holds generators configuration: