0.4.2:
    - in order to minimize TCP packets, CoW uses a user-space buffering scheme
      derived from Apache's code
    - KeepAlive is implemented and actually works now
    - included copy of GNU Pth has experimental sys_epoll support now; in
      theory this should be a lot faster than the current select() code
    - filename(s) of index files can be set in cow.conf now
    - 503 responses are no longer sent unless --enable-503 is specified during
      configuration; this was never actually getting used and probably would
      have just wasted resources
    - HTTP PUT requests are disabled unless --enable-put is passed at
      configuration 
    - socket backlog can be set with a -b command line 
    - CoW properly 'half-closes' sockets now as required by HTTP/1.1
    - lots of code cleanup

0.4.1:
    - fixed critical bug that caused only the first part (probably about 256K)
      of a file to actually be returned to the user
    - CoW was using a pool of pmsg structures for communication between the
      main thread and the depot, but was malloc'ing messages sent from the
      depot to the handlers; messages are now forwarded to handlers instead of
      copied so we avoid the malloc overhead
    - ability to disable the Nagle algorithm is provided as an option (Nagle
      remains enabled by default)
    - CoW now re-uses server socket so we don't have to wait a couple minutes
      after shutdown before restarting (avoids "Address in use" messages)
    - Popular mime types now "bubble" up to the top of the mime type list over
      time, making them less expensive to lookup in the future.
    - CoW is more lenient in many ways; it accepts use of \n instead of \r\n
      in headers and will silently ignore unrecognized/malformed headers
    - CoW now backgrounds itself unless -d is passed on the command line
    - fixed minor bug in connection counting
    - can now build against DMalloc memory debugger library
    - code cleanup and commenting, especially in request.c

0.4.0 (7/23/03):
    - first release by Matt
    - fixed compile errors in cow.c
    - fixed loop problem that resulted in crash on first connection
    - fixed message reuse crash that occurred under very high loads
    - added configuration file support (cow.conf)
    - updated build system to use autoconf parameters
    - misc cleanups and minor fixes

0.3.2:
    - last release by Takashi (available from
      http://wwwcsif.cs.ucdavis.edu/~ishihara/cow)