Version 1.21 is mainly a bugfix release over 1.4.20 and fixes at least 30 bugs. There are also 3 new features:
- mod_compress now supports caching through etags and last-modified
- a new config setting
debug.log-timeouts = "enable". The default is now disabled and eleminates annoying log entries - a new $HTTP["language"] conditional that allows interesting stuff like url rewritings that takes language codes into account
The official Lighttpd 1.4.21 release announcement and changelog ■