Fix function signature of NoClickjacking middleware

httph.go

@@ -56,7 +56,7 @@ type Middleware = func(next http.Handler) http.Handler
 // NoClickjacking is Middleware which sets headers to disallow frame embedding and XSS protection for older browsers.
 // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
 // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
-func NoClickjacking(next http.Handler) http.HandlerFunc {
+func NoClickjacking(next http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  w.Header().Set("X-Frame-Options", "deny")
  w.Header().Set("X-XSS-Protection", "1; mode=block")

httph_test.go

@@ -105,10 +105,8 @@ func TestNoClickjacking(t *testing.T) {
  req := httptest.NewRequest(http.MethodGet, "/", nil)
  res := httptest.NewRecorder()
 
- mux := http.NewServeMux()
- mux.HandleFunc("/", httph.NoClickjacking(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})))
-
- mux.ServeHTTP(res, req)
+ h := httph.NoClickjacking(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+ h.ServeHTTP(res, req)
 
  is.Equal(t, http.StatusOK, res.Result().StatusCode)
  is.Equal(t, "deny", res.Result().Header.Get("X-Frame-Options"))