finishing up the basic implementation of comments

comments/comments.go

@@ -68,6 +68,7 @@ func (cs *Service) User(r *http.Request) (string, bool) {
 func (cs *Service) ServeComments(post string, w http.ResponseWriter, r *http.Request) error {
 	user, allowed := cs.User(r)
 	if !allowed {
+		fmt.Fprintf(w, "<a href='/login'>click here to enter your name and the comments password</a>")
 		w.WriteHeader(401)
 		return nil
 	}