I have a site that I need to set as non-cachable. I have both the URL and
the file types set as non-cachable in Cachable Object Control, but some
users are still seeing cached data through the proxy.

Is there still a bug in read-ahead? I saw this tip on Craig's site about
disabling it to fix the problem where non-cachable objects and sites were
still being cached. However, I also noticed that this tip is almost four
years old.