Client server cache

Client send request for files available on server. It must show list of server files on its UI which resides in tmpfolder of Server application. Out of them, it will select one file to download. Request will first goes to cache. It will check whether it had requested file if yes it will respond to client else it will forward request to server. the server responds by sending content of requested file to cache. cache send reqponse back to client and saves a copy of downloaded file in its tmpfolder for future use. Client will never interact with server directly it will do that via cache only. same is the case with server.