3 files changed, 7 insertions, 9 deletions
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index 2135b280da..4be49516bf 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -14,10 +14,10 @@ module ActionDispatch
 
       def rack_app(app = self.app)
         @rack_app ||= begin
+          app = app.app
           class_name = app.class.name.to_s
-          if class_name == "ActionDispatch::Routing::Mapper::Constraints"
-            app.app
-          elsif ActionDispatch::Routing::Redirect === app || class_name !~ /^ActionDispatch::Routing/
+
+          if ActionDispatch::Routing::Redirect === app || class_name !~ /^ActionDispatch::Routing/
             app
           end
         end
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index b33c5e0dfd..c5e093dae5 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -216,10 +216,12 @@ module ActionDispatch
           end
 
           def app
+            endpoint = to.respond_to?(:call) ? to : dispatcher
+
             if blocks.any?
               Constraints.new(endpoint, blocks, @set.request_class)
             else
-              endpoint
+              Constraints.new(endpoint, blocks, @set.request_class)
             end
           end
 
@@ -306,10 +308,6 @@ module ActionDispatch
             Journey::Router::Strexp.compile(path, requirements, SEPARATORS)
           end
 
-          def endpoint
-            to.respond_to?(:call) ? to : dispatcher
-          end
-
           def dispatcher
             Routing::RouteSet::Dispatcher.new(defaults)
           end
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 924455bce2..f36453020f 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -704,7 +704,7 @@ module ActionDispatch
           old_params = req.path_parameters
           req.path_parameters = old_params.merge params
           dispatcher = route.app
-          if dispatcher.is_a?(Mapper::Constraints) && dispatcher.matches?(env)
+          if dispatcher.matches?(env)
             dispatcher = dispatcher.app
           end