Using CURL to Capture Website Response Time

using-curl-to-capture-website-response-time.md

Using CURL to Capture Website Response Time

Generate 2 CURL templates, the first is for readability and the second is for generating a CSV report over time.

$ tee &> /dev/null ~/.curl_report <<-EOT
       url_effective: %{url_effective}\n
           http_code: %{http_code}\n
\n
      speed_download: %{speed_download}\n
       size_download: %{size_download}\n
\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
EOT

$ tee &> /dev/null ~/.curl_csv <<-EOT
%{time_namelookup},%{time_connect},%{time_appconnect},%{time_pretransfer},%{time_redirect},%{time_starttransfer},%{time_total},%{size_download},%{speed_download},%{http_code},%{url_effective}\n
EOT

Single test

$ curl -skL -o /dev/null \
  -w "@${HOME}/.curl_report" \
  --limit-rate 1250000 \
  "http://localhost.localdomain/"

Reporting

5 minute of testing with a 30 second interval.

NOTE: 10 Megabit per second = 1250000 bytes per second.

$ URL='http://localhost.localdomain'; \
for i in {1..10}; do \
  printf -- \
    '%s,' \
    "$(date +%FT%T)"; \
  curl -skL -o /dev/null \
    -w "@${HOME}/.curl_csv" \
    --limit-rate 1250000 \
    "${URL}"; \
  sleep 30; \
done