the best way to serve assets so as to not needa do the 301.
<!-- Main Stylesheet -->
<asp:Placeholder runat="server">
<link href='<%= CDNUrl("/sitefiles/xxxx/css/master.css") %>' rel="stylesheet" type="text/css"></link>
</asp:Placeholder>
<!--buncha body code -->
<!-- Custom Helper Script -->
<asp:Placeholder runat="server">
<script src='<%= CDNUrl("/sitefiles/xxxx/js/helper.js") %>'></script>
</asp:Placeholder>