Using cURL to test HTTP response time

cURL-for-testing-HTTP-response.md

cuRL - Measuring HTTP Response Time

A way of measuring HTTP Response Time with cURL.

• curl is used to transfer data to and from a server
• in this example curl is used to measure website response time

Usage:

• curl -w "@curl-format.txt" -o -s www.costco.com

curl-format.txt file:

\n
	time_namelookup:	%{time_namelookup}\n
	time_connect:		%{time_connect}\n
	time_appconnect:	%{time_appconnect}\n
	time_pretransfer:	%{time_pretransfer}\n
	time_redirect:		%{time_redirect}\n
	time_starttransfer:	%{time_starttransfer}\n
	-----------------------------\n
	time_total:		%{time_total}\n
\n

Time Values

• time_namelookup - Start to end of name resolution
• time_connect - Start to end of TCP handshake
• time_appconnect - Start to end of SSL/SSH handshake
• time_pretransfer - Start to just before transfer begins
• time_redirect - Time for redirection to complete
• time_starttransfer - Start to First Byte of transfer
• time_total - Time to complete full operation