Advanced curl debugging
Jan 28, 2020 · 1 minute readUse curl write-out option
https://curl.haxx.se/docs/manpage.html
Exemple with a curl.cfg file with “csv” style output :
%{http_code};%{http_connect};%{stderr};%{stdout};%{time_namelookup};%{time_connect};%{time_appconnect};%{time_pretransfer};%{time_redirect};%{time_starttransfer};%{time_total};%{size_download};%{size_header};%{size_request};%{size_upload}\n
Use this output configuration in curl :
curl -s -o /dev/null -w "@curl.cfg" https://ralex.fr
Output :
;;200;200;;0,000065;0,000230;0,156049;0,156175;0,000000;0,187346;0,187442;5311;814;180;0;
Use parallel to launch simultaneous requests
seq 1000 | parallel -j5 'date=$(date "+%d-%m-%Y %H:%M:%S") curl=$(curl -s -o /dev/null -w "@curl.cfg" https://ralex.fr) && echo ${date}${curl} >> result.csv'
Timing diagram
From Cloudflare blog