@bagder I added a specific Cache-Control hack in Squid for old Internet Explorer around version 4, I think, and they didn't fix the bug for a few years. I stopped working with Squid around the time it got fixed, so I don't know when it got removed, but I'll assume it did, as it certainly hasn't been needed for at least a decade. IE was really a big waste of everybody's time, and Microsoft should be ashamed of themselves.