Golang Naked Redirect WWW Middleware

Last updated: Mar 2, 2024

It is important to make sure you site’s URL is either naked yoursite.com or with www. like www.yoursite.com. One should redirect to the other and you should keep is consistent for SEO.

If you redirect naked to www., and you use Go, you can use the following Go middleware to have all naked requests redirect with 301 to www.:

func RedirectNakedToWWW(handler http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// if host doesn't have www. redirect
		if !strings.HasPrefix(r.Host, "www.") {
			http.Redirect(w, r, fmt.Sprintf("https://www.%s", r.Host)+r.URL.String(), http.StatusMovedPermanently)
		handler.ServeHTTP(w, r)

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