Hi. Sorry about the delay. On Mon, Oct 25, 2004 at 07:38:23PM +0800, Xuefer wrote: > yes! i can't use ExtraHeaders! why? > with status "Not Modified" mathopd is NOT sending ExtraHeaders > this make IE send request again and again, get NO cache-control header :( > the status bar showing "downloading xx images" is "flashing" each time i click the > link to another page > not even make traffic high, but make user seeing the images so slow
Bummer. I don't use IE myself, so I can't verify this. Let me try to understand what is going on. 1. Browser request image which is not in cache 2. Server sends back image with "Cache-Control" header. Time passes... 3. Browsers reloads the image with "If-Modified-Since" (I guess) 4. Server sends back "304 Not Modified" response WITHOUT the "Cache-Control" header. 5. Browser gets confused and redoes the request. Is this in fact what has happened? I think that servers are not supposed to send "Cache-Control" headers when the response is "304 Not Modified", but it's been a while since I looked at the HTTP standard. Cheers Michiel
