3 files changed, 21 insertions, 4 deletions
diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index 51fbba3661..6aa4fe6019 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -79,6 +79,15 @@ module ActionController
     end
 
     class ActionEndpoint
+      @@endpoints = Hash.new {|h,k| h[k] = Hash.new {|h,k| h[k] = {} } }
+
+      def self.for(controller, action, stack)
+        @@endpoints[controller][action][stack] ||= begin
+          endpoint = new(controller, action)
+          stack.build(endpoint)
+        end
+      end
+
       def initialize(controller, action)
         @controller, @action = controller, action
       end
@@ -88,6 +97,16 @@ module ActionController
       end
     end
 
+    extlib_inheritable_accessor(:middleware_stack) { ActionDispatch::MiddlewareStack.new }
+
+    def self.use(*args)
+      middleware_stack.use(*args)
+    end
+
+    def self.middleware
+      middleware_stack
+    end
+
     # Return a rack endpoint for the given action. Memoize the endpoint, so
     # multiple calls into MyController.action will return the same object
     # for the same action.
@@ -98,8 +117,7 @@ module ActionController
     # ==== Returns
     # Proc:: A rack application
     def self.action(name)
-      @actions ||= {}
-      @actions[name.to_s] ||= ActionEndpoint.new(self, name)
+      ActionEndpoint.for(self, name, middleware_stack)
     end
   end
 end
diff --git a/actionpack/lib/action_controller/metal/filter_parameter_logging.rb b/actionpack/lib/action_controller/metal/filter_parameter_logging.rb
index 065e62a37f..4259d9de19 100644
--- a/actionpack/lib/action_controller/metal/filter_parameter_logging.rb
+++ b/actionpack/lib/action_controller/metal/filter_parameter_logging.rb
@@ -49,7 +49,7 @@ module ActionController
               end
             elsif block_given?
               key = key.dup
-              value = value.dup if value
+              value = value.dup if value.duplicable?
               yield key, value
               filtered_parameters[key] = value
             else
diff --git a/actionpack/lib/action_controller/testing/integration.rb b/actionpack/lib/action_controller/testing/integration.rb
index e7104e5c3d..791f936f51 100644
--- a/actionpack/lib/action_controller/testing/integration.rb
+++ b/actionpack/lib/action_controller/testing/integration.rb
@@ -259,7 +259,6 @@ module ActionController
             "rack.url_scheme" => https? ? "https" : "http",
 
             "REQUEST_URI"    => path,
-            "PATH_INFO"      => path,
             "HTTP_HOST"      => host,
             "REMOTE_ADDR"    => remote_addr,
             "CONTENT_TYPE"   => "application/x-www-form-urlencoded",