What is the difference between chi.Use and chi.With when setting up a middleware with Chi router.

CodePudding user response：

According to the documentation of chi.Use and chi.With.

Use appends a middleware handler to the Mux middleware stack.

The middleware stack for any Mux will execute before searching for a matching route to a specific handler, which provides opportunity to respond early, change the course of the request execution, or set request-scoped values for the next http.Handler.

With adds inline middlewares for an endpoint handler.

CodePudding user response：

Use must be declared before all routes under the same group, whereas r.With allows you to "inline" middlewares.

As a matter of fact, the function signatures are different. Use returns nothing, With returns a chi.Router.

Let's say you have a route and want to add a middleware only to one of them, you would use r.With:

r.Route("/myroute", func(r chi.Router) {
    r.Use(someMiddleware) // can declare it here
    r.Get("/bar", handlerBar)
    r.Put("/baz", handlerBaz)
    // r.Use(someMiddleware) // can NOT declare it here
}

r.Route("/other-route", func(r chi.Router) {
    r.Get("/alpha", handlerBar)
    r.Put("/beta", handlerBaz)

    r.With(someMiddleware).Get("/gamma", handlerQuux)
}

In the first example, someMiddleware is declared for all sub-routes, whereas in the second example r.With allows you to add a middleware only for the /other-route/gamma route.