Quickly test if Cloudflare is caching a resource

is_cloudflare_caching.bash

#!/usr/bin/env bash

readonly DIR=$(dirname $(readlink -f "$0"))
cd $DIR;
set -e
set -u
set -o pipefail
standardIFS="$IFS"
IFS=$'\n\t'

usage() {
    echo "Usage: $0 [URL to test]";
}

if (( $# != 1 )); then
    usage;
    exit 1;
fi

readonly url=$1;

readonly result=$(curl -I --silent --stderr - "${url}" | grep 'cf-cache-status: HIT');

if [[ -z "${result}" ]]; then
    echo "Not cached by Cloudflare";
else
    echo "Cached by Cloudflare";
fi