simple get:
curl https://www.knguyenvan.com
time a get curl:
time https://curl www.knguyenvan.com
get with details (verbose)
curl -v https://www.knguyenvan.com
get with headers only
curl -I https://www.knguyenvan.com
get with headers only 2
curl -sSL -D - www.knguyenvan.org -o /dev/null
post with body
curl -H "Content-type: application/json" -X POST -d '{"some_param":"some_value"}' https://www.knguyenvan.com