3 files changed, 15 insertions, 6 deletions
diff --git a/actionpack/lib/action_dispatch/routing/endpoint.rb b/actionpack/lib/action_dispatch/routing/endpoint.rb
index e911b6537b..24dced1efd 100644
--- a/actionpack/lib/action_dispatch/routing/endpoint.rb
+++ b/actionpack/lib/action_dispatch/routing/endpoint.rb
@@ -3,10 +3,12 @@
 module ActionDispatch
   module Routing
     class Endpoint # :nodoc:
-      def dispatcher?;   false; end
-      def redirect?;     false; end
-      def matches?(req); true;  end
-      def app;           self;  end
+      def dispatcher?;                           false; end
+      def redirect?;                             false; end
+      def engine?;       rack_app.respond_to?(:routes); end
+      def matches?(req);                          true; end
+      def app;                                    self; end
+      def rack_app;                                app; end
     end
   end
 end
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index b2868b7427..a2205569b4 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -15,7 +15,7 @@ module ActionDispatch
       end
 
       def rack_app
-        app.app
+        app.rack_app
       end
 
       def path
@@ -47,7 +47,7 @@ module ActionDispatch
       end
 
       def engine?
-        rack_app.respond_to?(:routes)
+        app.engine?
       end
     end
 
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 71cb458112..987e709f6f 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -842,6 +842,10 @@ module ActionDispatch
         end
 
         req = make_request(env)
+        recognize_path_with_request(req, path, extras)
+      end
+
+      def recognize_path_with_request(req, path, extras)
         @router.recognize(req) do |route, params|
           params.merge!(extras)
           params.each do |key, value|
@@ -860,6 +864,9 @@ module ActionDispatch
             end
 
             return req.path_parameters
+          elsif app.matches?(req) && app.engine?
+            path_parameters = app.rack_app.routes.recognize_path_with_request(req, path, extras)
+            return path_parameters
           end
         end