Curl format for displaying time infomation.

curl.time.sh

#!/usr/bin/env bash
# Reference: https://stackoverflow.com/questions/18215389/how-do-i-measure-request-and-response-times-at-once-using-curl
curl_format="\
%{time_namelookup}:\
%{time_connect}:%{time_appconnect}:\
%{time_pretransfer}:%{time_redirect}:\
%{time_starttransfer}:%{time_total}"
curl_result=$(echo "$curl_format" | curl -s -o /dev/null -w @- $@)

IFS=':' read -r -a array <<< "$curl_result"
namelookup="${array[0]}"
connect="${array[1]}"
appconnect="${array[2]}"
pretransfer="${array[3]}"
redirect="${array[4]}"
starttransfer="${array[5]}"
total="${array[6]}"

calc_delta () { awk -v a="$1" -v b="$2" 'BEGIN {printf "%.6f", b-a}'; }

delta_connect=$(calc_delta $namelookup $connect)
if [ "$appconnect" = "0.000000" ]; then
    delta_appconnect=$appconnect
    delta_pretransfer=$(calc_delta $connect $pretransfer)
else
    delta_appconnect=$(calc_delta $connect $appconnect)
    delta_pretransfer=$(calc_delta $appconnect $pretransfer)
fi
if [ "$redirect" = "0.000000" ]; then
    delta_redirect=$redirect
    delta_starttransfer=$(calc_delta $pretransfer $starttransfer)
else
    delta_redirect=$(calc_delta $pretransfer $redirect)
    delta_starttransfer=$(calc_delta $redirect $starttransfer)
fi
delta_total=$(calc_delta $starttransfer $total)

echo_format="\
  DNS Lookup: ${namelookup}s
 TCP Connect: ${connect}s - $delta_connect
 TLS Connect: ${appconnect}s - $delta_appconnect
Pre-transfer: ${pretransfer}s - $delta_pretransfer
    Redirect: ${redirect}s - $delta_redirect
        TTFB: ${starttransfer}s - $delta_starttransfer
               ---------
       Total: ${total}s - $delta_total"
echo "$echo_format"