How to implement case insensitive URL matching using gorilla mux - go

Question

I need to implement case insensitive URL matching in gorilla mux as it is done here for built in mux
I tried to achieve the same using middle-ware like this
router := mux.NewRouter()
router.Use(srv.GetCaseMiddleware())
//GetCaseMiddleware middleware to make match URL case insensitive
func (srv *Server) GetCaseMiddleware() (w mux.MiddlewareFunc) {
var middleware mux.MiddlewareFunc = func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = strings.ToLower(r.URL.Path)
next.ServeHTTP(w, r)
})
}
return middleware
}
but still it throws 404 if URL case is changed,is there any way to implement it using gorilla-mux

Answer 1

Unfortunately, as of this writing, middleware functions are invoked after URL matching in gorilla/mux.
Mux supports the addition of middlewares to a Router, which are executed in the order they are added if a match is found, including its subrouters.
I would suggest going with the example in the link you provided.
e.g.
func CaselessMatcher(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = strings.ToLower(r.URL.Path)
next.ServeHTTP(w, r)
})
}
Then, just wrap your multiplexer.
r := mux.NewRouter()
//...
handler := CaselessMatcher(r)
It's actually not bad IMO.