讲这些语句加到squid配置里面 我用的是 squid 2.5
refresh_pattern . 0 20% 4320
refresh_pattern -i \.(htm|html|txt|js)$ 0 66% 1440 reload-into-ims
refresh_pattern -i \.(bmp|gif|jpg|png|swf)$ 0 66% 4320 reload-into-ims