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Curl Command To Measure DNS And Network Timing

Curl Command To Measure DNS And Network Timing

The curl command line tool has a reporting option which you can use to measure different bits of timing in the network handling. This can be useful to monitor or investigate network issues:

curl -s --connect-timeout 5 \ -w "time_namelookup: %{time_namelookup}, time_connect: %{time_connect}, time_appconnect: %{time_appconnect}, time_pretransfer: %{time_pretransfer}, time_redirect: %{time_redirect}, time_starttransfer: %{time_starttransfer}, time_total: %{time_total}\n" \ -o /dev/null \ https://www.kaper.com/
Code language: Bash (bash)

Example output:

$ curl -s --connect-timeout 5 -w "time_namelookup: %{time_namelookup}, time_connect: %{time_connect}, time_appconnect: %{time_appconnect}, time_pretransfer: %{time_pretransfer}, time_redirect: %{time_redirect}, time_starttransfer: %{time_starttransfer}, time_total: %{time_total}\n" -o /dev/null https://www.kaper.com/ time_namelookup: 0,372554, time_connect: 0,389102, time_appconnect: 0,433429, time_pretransfer: 0,433522, time_redirect: 0,000000, time_starttransfer: 0,739809, time_total: 0,837366
Code language: Bash (bash)

You can also insert \n’s in the option to put the result on multiple lines:

$ curl -s --connect-timeout 5 -w "time_namelookup: %{time_namelookup}\ntime_connect: %{time_connect}\ntime_appconnect: %{time_appconnect}\ntime_pretransfer: %{time_pretransfer}\ntime_redirect: %{time_redirect}\ntime_starttransfer: %{time_starttransfer}\ntime_total: %{time_total}\n" -o /dev/null https://www.kaper.com/ time_namelookup: 0,003033 time_connect: 0,018615 time_appconnect: 0,059657 time_pretransfer: 0,059775 time_redirect: 0,000000 time_starttransfer: 0,222467 time_total: 0,292495
Code language: Bash (bash)

December 19, 2021

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