如何在设置代理服务器时使用本地静态文件

I am setting up proxy server using NODE and EXPRESS. I have the same setup/codebase in local and proxy server. But i want to use all the js,css,images and other static content from local machine and json response from proxy server. Now since the proxy server also has same ,js,css,images, it is picking up everything from proxy. Do I need to restrict urls calls to not pick js,css,images and other static content from proxy but from local. How do i do that? Here is the code structure (both in local and proxy)I am setting up proxy server using NODE and EXP