I have a servlet serves files for web browser. How can Servket knows if the HTTP web browser had: 1) finished download 100% of the file, or; 2) only downloaded 50% of the file then click cancel, or; 3) only downloaded 70% then reboot the machine -- If user had downloaded the whole file. user cannot re-download the file again. -- If user click cancel in the middle or didn't download 100% of a file --> server will know this and user can download it again. i think the TCP/IP layer (socket) will keep track of acknowledgment send back from client. but how do i implement this in my servlet? i also heard there is a bug in tomcat prevent from counting # bytes client receive if use with apache web server. since acknowledgment is send back to apache server but not tomcat. thanks. __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/
