When Used before_request Decorator in the main file , it raises origin policy error

[shivamguys]

When I am using the decorator in the main file it raises me an error while everything works fine without using that.

[shivamguys]

Just Add a cross_origin() decorator below to that it works like a charm,but then issue is that before_each decorator needs to return some response although it's not supposed to return any response but using a cross origin decorator just mimics the cross origin and it makes it as a normal function that should return some response.

Error SS Below