Golang HTTP サーバーで Mux ハンドラーを動的に変更するにはどうすればよいですか?

<code class="go">type Handler struct {
    http.HandlerFunc
    Enabled bool
}

type Handlers map[string]*Handler

// Implementation of ServeHTTP that checks if the handler is enabled
func (h Handlers) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    path := r.URL.Path
    if handler, ok := h[path]; ok &amp;&amp; handler.Enabled {
        handler.ServeHTTP(w, r)
    } else {
        http.Error(w, "Not Found", http.StatusNotFound)
    }
}</code>

<code class="go">mux := http.NewServeMux()
handlers := Handlers{}

handlers.HandleFunc(mux, "/", func(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("this will show once"))
    handlers["/"].Enabled = false
})

http.Handle("/", mux)</code>

<code class="go">func DisableRouteMiddleware(disabledRoutes []string) func(http.Handler) http.Handler {
    return func(next http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
            for _, route := range disabledRoutes {
                if r.URL.Path == route {
                    http.Error(w, "Disabled", http.StatusNotFound)
                    return
                }
            }
            next.ServeHTTP(w, r)
        })
    }
}</code>