Golang http muxer with middleware support

mux.go

package mux

import (
	"fmt"
	"net/http"
)

type Middleware struct {
	mux         *http.ServeMux
	middlewares [](func(http.Handler) http.Handler)
}

func NewServeMux() Middleware {
	return Middleware{
		mux: http.NewServeMux(),
	}
}

func (m *Middleware) AddMiddleware(handler func(http.Handler) http.Handler) {
	m.middlewares = append(m.middlewares, handler)
}

func (m Middleware) Route(pattern string, f func(m *Middleware, prefix string) http.Handler) {
	newMux := NewServeMux()
	for _, h := range m.middlewares {
		newMux.AddMiddleware(h)
	}
	m.mux.Handle(pattern, f(&newMux, pattern))
}

func (m Middleware) Handle(pattern string, handler func(http.ResponseWriter, *http.Request)) {
	var newHandler http.Handler = http.HandlerFunc(handler)

	for _, h := range m.middlewares {
		newHandler = h(newHandler)
	}
	m.mux.Handle(pattern, newHandler)
}

func (m Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	m.mux.ServeHTTP(w, r)
}

func (m Middleware) Error(w http.ResponseWriter, error string, code int) {
	w.Header().Set("X-Content-Type-Options", "nosniff")
	w.WriteHeader(code)
	fmt.Fprintln(w, error)
}

func (m Middleware) Write(w http.ResponseWriter, msg string, args ...interface{}) {
	fmt.Fprintf(w, msg, args...)
}