Chrome - why is it sending if-modified-since reque

Question

I have a page with lots of small images (icons). When used with chrome, each time the page is reloaded, chrome requests each icon from the server with if-modified-since header.

All icons are served with expires and max-age headers. Firefox loads images from its cache.

Why is chrome doing that and how can I prevent it?

Thanks

Answer 1

Have you checked the request headers?

"‘Cache-Control’ is always set to ‘max-age=0′, no matter if you press enter, f5 or ctrl+f5. Except if you start Chrome and enter the url and press enter."

http://techblog.tilllate.com/2008/11/14/clientside-cache-control/