Manage ActionDispatch::ActionableExceptions from the default middleware stack

actionpack/lib/action_dispatch/middleware/debug_exceptions.rb

@@ -21,7 +21,7 @@ module ActionDispatch
     end
 
     def initialize(app, routes_app = nil, response_format = :default, interceptors = self.class.interceptors)
-      @app             = ActionableExceptions.new(app)
+      @app             = app
       @routes_app      = routes_app
       @response_format = response_format
       @interceptors    = interceptors

actionpack/test/abstract_unit.rb

@@ -96,6 +96,7 @@ class ActionDispatch::IntegrationTest < ActiveSupport::TestCase
     RoutedRackApp.new(routes || ActionDispatch::Routing::RouteSet.new) do |middleware|
       middleware.use ActionDispatch::ShowExceptions, ActionDispatch::PublicExceptions.new("#{FIXTURE_LOAD_PATH}/public")
       middleware.use ActionDispatch::DebugExceptions
+      middleware.use ActionDispatch::ActionableExceptions
       middleware.use ActionDispatch::Callbacks
       middleware.use ActionDispatch::Cookies
       middleware.use ActionDispatch::Flash

railties/lib/rails/application/default_middleware_stack.rb

@@ -49,6 +49,7 @@ module Rails
           middleware.use ::Rails::Rack::Logger, config.log_tags
           middleware.use ::ActionDispatch::ShowExceptions, show_exceptions_app
           middleware.use ::ActionDispatch::DebugExceptions, app, config.debug_exception_response_format
+          middleware.use ::ActionDispatch::ActionableExceptions
 
           unless config.cache_classes
             middleware.use ::ActionDispatch::Reloader, app.reloader

railties/test/application/middleware_test.rb

@@ -38,6 +38,7 @@ module ApplicationTests
         "Rails::Rack::Logger",
         "ActionDispatch::ShowExceptions",
         "ActionDispatch::DebugExceptions",
+        "ActionDispatch::ActionableExceptions",
         "ActionDispatch::Reloader",
         "ActionDispatch::Callbacks",
         "ActiveRecord::Migration::CheckPending",
@@ -70,6 +71,7 @@ module ApplicationTests
         "Rails::Rack::Logger",
         "ActionDispatch::ShowExceptions",
         "ActionDispatch::DebugExceptions",
+        "ActionDispatch::ActionableExceptions",
         "ActionDispatch::Reloader",
         "ActionDispatch::Callbacks",
         "Rack::Head",