Compare compressed and uncompressed requests using cURL

size_compare.sh

#!/usr/bin/env bash
set -e

compare() {
  echo "URI: ${1}"

  SIZE=$(curl -so /dev/null "${1}" -w '%{size_download}')
  echo "Uncompressed size : $SIZE bytes"

  # compressed add the header Accept-Encoding: deflate, gzip, br, zstd
  SIZE=$(curl --compressed -so /dev/null "${1}" -w '%{size_download}') 
  echo "Compressed size (with --compressed): $SIZE bytes"

  SIZE=$(curl -H 'Accept-Encoding: gzip, compress, deflate' -so /dev/null "${1}" -w '%{size_download}')
  echo "Compressed size (with header): $SIZE bytes"
}

compare $1