Overriding Caches

     Issue: Does the user have complete control over a private cache?
            I.e., can the user configure the cache to ignore/override
            certain cache directives/defaults, as is commonly known in
            browsers as the "never check" mode?

            Answer: Yes.  There is no way for the protocol to prevent it,
                    regardless of our opinions on the matter.

     Issue: Given the above, is it reasonable to require some indication
            be presented (not necessarily a dialog box -- more likely a
            broken-key type symbol) which indicates that the origin
            server's requirements are being overridden?

            Answer: Yes.

http working group issues