guys, I've been developing an iphone web application for a while, and encountered a weird problem:

when open the web app in safari(with safari chrome, not starting it from home screen), safari can generate proper "If-Not-Modified-Since" and "If-None-Matches", so the server simply gives 304 Not Modified to speed up the process.

however, when starting the app from home screen, safari seems to forget these two headers, and server always replies with 200 OK...

any ideas for this?