如何防止用户访问特定目录

I have a directory named "includes" containing information about my database and some other important files that users should not access. I want to use an .htaccess file to redirect requests that begin with "/includes" to errors/403.html. This is my code but it does not work. What's the problem?!

RewriteEngine On    # Turn on the rewriting engine
RewriteRule    ^/includes/([a-zA-Z]+)/?$    /errors/403.html    [NC,L]

If your config files are php, you can just place empty index.php in that directory or create .htaccess with Options -Indexes or Deny from All there (in includes/).