curl统计时长

curl -o /dev/null -s -w "time_namelookup:%{time_namelookup}\ntime_connect: %{time_connect}\ntime_starttransfer: %{time_starttransfer}\ntime_total: %{time_total}\n" "https://www.baidu.com"

time_namelookup:0.017484
time_connect: 2.061431
time_starttransfer: 4.671446
time_total: 4.671580