CURL 测试下载速率

curl -H  -H 'User-Agent: Chrom'  -L -w %{speed_download} -o/dev/null -s  "http://urlstring"
curl -Lo /dev/null -skw "remote_ip: %{remote_ip} \ntime_connect: %{time_connect} s\ntime_namelookup: %{time_namelookup} s\ntime_pretransfer: %{time_pretransfer} s\ntime_starttransfer: %{time_starttransfer} s\ntime_redirect: %{time_redirect} s\nspeed_download: %{speed_download} B/s\ntime_total: %{time_total} s\n\n"   "http://URL"