apache日志中出现的疑惑

74.133.66.88 www.abc.com - - [20/Sep/2007:00:00:11 +0800] "GET http://211.121.82.242/config/isp_verify_user? HTTP/1.0" 999 4368 "-" "-" "-"

86.203.20.55 www.abc.com - - [20/Sep/2007:00:04:38 +0800] "HEAD http://n13.login.mud.yahoo.com/config/isp_verify_user? HTTP/1.1" 999 295 "-" "-" "-"

像上面2个apache的日志记录,最后面的 999 4368 "-" "-" "-"和999 295 "-" "-" "-"分别是什么?这说明什么?而且两处的数字不一样。
谢谢!