Folks, If you have been following along my other questions, I want to use a proxy on my kiosk to cache downsized images. The problem is that the system operator can make changes to images, such as rotating them or cropping them. If I understand all this correctly, I can change the Last-Modified header to reflect the last time the image was changed rather then when the script was run to downsize the image. Correct? Assuming I can change the Last-Modified header, is there some type of "pre-fetch" that the proxy does to JUST get the header info as to knows whether or not to get the generated content? Assuming there is some type of pre-fetch. Is my impression correct that I have to handle the pre-fetch correctly within my script (PHP, by the way) and not do the actual content when receiving a pre-fetch request? If my impression is correct about this whole thing, how do I detect that the request is a pre-fetch and not a full fetch, generically speaking, for I don't know if I am going to be sticking with PHP;) Sam
