FIX: regression, missing 404 page

app/controllers/application_controller.rb

@@ -153,7 +153,7 @@ class ApplicationController < ActionController::Base
     end
   end
 
-  rescue_from Discourse::NotFound, PluginDisabled  do
+  rescue_from Discourse::NotFound, PluginDisabled, ActionController::RoutingError  do
     rescue_discourse_actions(:not_found, 404)
   end
 

lib/middleware/discourse_public_exceptions.rb

@@ -17,12 +17,22 @@ module Middleware
       response = ActionDispatch::Response.new
 
       if exception
+        begin
           fake_controller = ApplicationController.new
           fake_controller.response = response
+          fake_controller.request = ActionDispatch::Request.new(env)
 
           if ApplicationController.rescue_with_handler(exception, object: fake_controller)
-          return [response.status, response.headers, response.body]
+            body = response.body
+            if String === body
+              body = [body]
             end
+            return [response.status, response.headers, body]
+          end
+        rescue => e
+          Discourse.warn_exception(e, message: "Failed to handle exception in exception app middleware")
+        end
+
       end
       super
     end