what's your site's URL ? you can PM it.
I've managed to search out the conversation with Mike you mentioned in your reference. He emailed us around June 1, about this "304 response issues". We just replied it might be a php issue and asked him to try on apache ? then no response from him since then. As far as I know, we don't insist on this is a php issue, and haven't ever said will fix it in next release. To us, it's just an issue need more information, but lost the further response from the customer. This is why I ask you to provide an URL to investigate it further. Once we confirm the issue, we'd glad to fix it.