curl命令查用操作

curl -o /dev/null -s -w "http_code: %{http_code} http_connect:%{http_connect} content_type:%{content_type} time_dns:%{time_namelookup} time_redirect:%{time_redirect} time_pretransfer:%{time_pretransfer} time_connect:%{time_connect} time_starttransfer:%{time_starttransfer} time_total:%{time_total}: speed_download:%{speed_download} " "http://www.test.com/23.jpg";