On Fri, Jul 27, 2007 at 07:29:24AM +0100, Andrew Black - lists wrote:
Do proxying caches remember the Modified: and Expired: header when they fetch a page. Or do they always go back to the main site and ask them for the headers for the page. And if they ask for the headers, might that end up as two hits?
This is why the If-Modified-Since request header exists.