compare-compression.sh

#!/usr/bin/env bash

# This script compares the different compression & download times of a cdn using the `Accept-Encoding` header
# It will compare Brotli, Gzip, and uncompressed responses
#
# ./compare-compress.sh https://my-url.com

set -euo pipefail

URL=$1

function gzip() {
  URL="$1"
  printf "%-40s" "gzipped, $URL"
  curl -so /dev/null $URL -H "Accept-Encoding: gzip" -w '%{size_download}, Connect: %{time_connect} TTFB: %{time_starttransfer} Total time: %{time_total}\n'
}

function brotli() {
  URL="$1"
  printf "%-40s" "brotli, $URL"
  curl -so /dev/null $URL -H "Accept-Encoding: br" -w '%{size_download}, Connect: %{time_connect} TTFB: %{time_starttransfer} Total time: %{time_total}\n'
}

function uncompressed() {
  URL="$1"
  printf "%-40s" "uncompressed, $URL"
  curl -so /dev/null $URL -H "Accept-Encoding:" -w '%{size_download}, Connect: %{time_connect} TTFB: %{time_starttransfer} Total time: %{time_total}\n'
}

uncompressed $URL
gzip $URL
brotli $URL