if-modified-since

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 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/ With chrome it

I have a PHP script which is called with an ?img= parameter. The value for that parameter is an (urlencoded) URL of an image. My script checks, if that image is already stored at my server. If not - it downloads it. After that it optionally resizes the image and sends it to STDOUT, i.e. back to the requesting browser, prepended with Content-Type and Last-modified headers: Connection:close Content-Type:image/jpeg Date:Fri, 01 Jun 2012 08:28:30 GMT Last-Modified:Fri, 01 Jun 2012 08:02:44 GMT Server:Apache/2.2.15 (CentOS) Transfer-Encoding:chunked X-Powered-By:PHP/5.3.3 This is needed to