a simple http protocol implement
curl -o 'g.html' -w '%{time_total} %{time_starttransfer}' -A 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36' 'https://www.google.com/search?q=webkit'