I've seen routers that allows you to use middleware like this:

router.Use(yourMiddleware)

and i've been thinking that there is another approach and i want to know if it's useful or not, I am practicing on coding a mux in go Garson and it occurred to me i could implement middleware usage like this

router := garson.New() 
// the next line registers two middlewares to be executed before each request 
router.Before(garson.LoggerMiddleware, garson.OnlyJSONMiddleware) 
// the next line registers one middleware to be executed after each request 
router.After(garson.SomeOtherMiddlware) 
// the next line registers one middleware to be executed only before this route 
router.Post("/api/comments").Before(AuthMiddleware)

what do you guys think ? in terms of real projects usage.