iPhone Safari Web Application not using cache at all?

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 s开发者_StackOverflow中文版creen, safari seems to forget these two headers, and server always replies with 200 OK...

any ideas for this?

See if this helps you at all.

http://new.efficientcoder.net/2009/06/webkitsafari-application-cache-work.html

Check for consistency in the manifest file.

Somehow I also was dealing with 304 returncodes for my manifestfile (in normal safaribrowser mode on my iphone)..and always 200 returncodes when starting from homescreen.

In the end it was really stupid.. I didn't watch my chrome console for a while..which pointed out that my manifest-file was corrupt.