- on pipe signal, check to see which closed, and if so, reopen to server or gracefully finish client.
- allow cache_file and real_server_name to have multiple values: perldoc Getopt::Long, "Options with multiple values".
- pull default servers out of *.razor.vipul.net with list terminator syntax and test for reachability.
- add seconds and records/second statistics
- check and modify behavior based on "protocol version N" in server_banner.
- add a configurable max age for non-pos, non-neg entries too?
- add separate writable cache file.
- write a cache-cleaner tool to run once a week:
	- loads all cache files into hashes with same discard.
	- max_pos|neg_age CLP's to specify oldest to be kept.
	- writes out newest entries, as long as they're younger than that set of ages.
- packaging
	- /usr/sbin/razor-caching-proxy.pl
- select on client filehandle; add and remove server filehandle as approriate when opening/closing.
- autodetermine target IP if client connection redirected and connect out to that if a non-local IP.
- pull in syncing command into documentation
- put out an Exiting banner on exit