Just wrote a quick shell script to test web server cache and background updating by displaying header output from curl.
Don’t have time to write a description here, just having the script for reference.
#!/bin/bash # # 2016-05-06 20:22:35 # myrveln@gmail.com # # Test cache functionality # usage(){ echo "Usage: $0 [ http://domain.com ] [ sleeptimer ]" exit 1 } # We need two parameters if [[ $# -lt 2 ]]; then usage exit 1 # We want only full urls elif [[ ! $1 == http*://* ]]; then usage exit 1 # We want only numeric sleeptimer elif [[ -z "${2##*[!0-9]*}" ]]; then usage exit 1 fi echo "TERMINATE THE SCRIPT WITH CTRL+C" echo "----------------------" while true do START_TIME="$(date +%s%N)" OUTPUT=$(curl -o /dev/null -D - -s ${1} | grep 'Age:\|Warning:\|X-Cache\|Via:\|Expires:\|X-RateLimit-Remaining:' | sort) ELAPSED_TIME="$((($(date +%s%N) - ${START_TIME})/1000000))" echo "${OUTPUT}" echo "Elapsed time: ${ELAPSED_TIME} ms" echo "----------------------" sleep ${2} done