2 files changed, 7 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb b/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
index a8f49bd3bd..7349b578d2 100644
--- a/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
+++ b/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
@@ -12,7 +12,8 @@ module ActionDispatch
       'ActionController::MethodNotAllowed'         => :method_not_allowed,
       'ActionController::NotImplemented'           => :not_implemented,
       'ActionController::UnknownFormat'            => :not_acceptable,
-      'ActionController::InvalidAuthenticityToken' => :unprocessable_entity
+      'ActionController::InvalidAuthenticityToken' => :unprocessable_entity,
+      'ActionController::BadRequest'               => :bad_request
     )
 
     cattr_accessor :rescue_templates
diff --git a/actionpack/lib/action_dispatch/middleware/stack.rb b/actionpack/lib/action_dispatch/middleware/stack.rb
index 12bc438be3..bbf734f103 100644
--- a/actionpack/lib/action_dispatch/middleware/stack.rb
+++ b/actionpack/lib/action_dispatch/middleware/stack.rb
@@ -75,6 +75,11 @@ module ActionDispatch
       middlewares[i]
     end
 
+    def unshift(*args, &block)
+      middleware = self.class::Middleware.new(*args, &block)
+      middlewares.unshift(middleware)
+    end
+
     def initialize_copy(other)
       self.middlewares = other.middlewares.dup
     end