+ copy over new -z semantics; don't automatically wipeout cache
+ request-range
++ hit metering
+ we don't properly handle the HTTP/1.1 'Connection' header
+ ETag support (makes metadata bigger--ack!)
-+ make USE_PROXY_AUTH standard
+ Incorporate Pelletier's latest retry patch for 1.1
+ FTP PUT
+ be more persistent in forwarding requests; return fewer error pages
+ fix all the assert(!ERR_FOO) placeholders
+ Finish hacking at storeCopy() to achieve in-memory sliding window
for objects being retrieved.
++ make USE_PROXY_AUTH standard