Stuff that we need for a working cache:

7) check for If-* headers and other evil headers (like Translate)
8) logging
10) understand dates and etags for sending 304s.
11) default memory size algorithm

other good stuff:

1) perf counters
2) cache browsing api
3) more stats and instrumentation
4) better table size computations ( would like prime # of buckets ).
5) look-aside lists for frequently allocated resources
7) smarter config based (and tree) invalidation


Stuff to do in umode

3) use cache browse api
4) use handle based file chunks