Nesting subrouters in Gorilla Mux

For those who are struggling to split between auth and noauth routes, the following works fine for me:

r := mux.NewRouter()

noAuthRouter := r.MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
    return r.Header.Get("Authorization") == ""
}).Subrouter()

authRouter := r.MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
    return true
}).Subrouter()

Then you can apply middleware for authRouter only

I figured it out, so I'll just post it here in case someone is as stupid as I was. :D

When creating path-based subrouter, you have to obtain it with PathPrefix instead of Path.

r.PathPrefix("/api").Subrouter()

Use r.Path("/api") only when attaching handlers to that endpoint.