BLOX site content is served off of 3 server clusters represented in the below table. The BLOX servers run everything that has to do with the CMS. The /app directory is where customers can place custom code or files they want to create.  Files within the /app directory will be served from either the APP server or the Image server depending on the file type. The APP server only serves PHPfiles. The Image server will serve any other file extension type other than PHP that is loaded to the /app directory.