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Learn more about Teams router := mux.NewRouter().StrictSlash(true) router.HandleFunc("/api", home) fs := http.FileServer(http.Dir("../public")) http.Handle("/", fs) http.HandleFunc("/ws", handleConnections) go handleMessages() log.Println("http server started on :8000") err := http.ListenAndServe(":8000", nill) if err != nil { log.Fatal("ListenAndServe: ", err)

With the above code, the /api route gives a 404. But if I change the err := http.ListenAndServe(":8000", nill) to err := http.ListenAndServe(":8000", router) , the /api route works but the / route (which I serve the frontend) gives a 404.

How do I make them both work?

Edit: full code - https://codeshare.io/2Kpyb8

The second parameter type of the http.ListenAndServe function is http.Handler, if he is nil, http lib use http.DefaultServeMux http.Handler.

your /api route register to mux.NewRouter() , your / and /ws route register to http.DefaultServeMux ,These are two different http.Handler objetc, You need to merge the routing requests registered by the two routers.

    router := mux.NewRouter().StrictSlash(true)
    router.HandleFunc("/api", home)
    // move ws up, prevent '/*' from covering '/ws' in not testing mux, httprouter has this bug.
    router.HandleFunc("/ws", handleConnections)
    // PathPrefix("/") match '/*' request
    router.PathPrefix("/").Handler(http.FileServer(http.Dir("../public")))
    go handleMessages()
    http.ListenAndServe(":8000", router)
gorilla/mux example not use http.HandleFunc function.
                I not use gorilla/mux, uncertain route / or /* match all request,like / can mathc all request uri.  your 404 is file not found, not is route 404. os.Open has no file return 404,Permission denied return 403.    static file reference forum.golangbridge.org/t/…
– eudore
                Apr 10, 2020 at 16:15
                The following wildcard matching was studied. The correct code is router.PathPrefix("/").Handler(http.FileServer(http.Dir("../public"))). The mux library is different from other library frameworks. Chaos design interface.
– eudore
                Apr 10, 2020 at 16:32
                /* route and wildcards route will override other routes in mux and httprouter. /* contain /ws path, So pay attention to the order of routing registration.
– eudore
                Apr 11, 2020 at 2:34
        
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