For testing max age of cached resources. bash age-test.sh <http://your-resource/> <age in milliseconds> <optional: HTTP host name>

age-test.sh

#!/bin/bash

shopt -s extglob # Required to trim whitespace

RESOURCE=$1
AGE=$2
HOST=$3
GREEN=$(tput setaf 2)
RED=$(tput setaf 1)
WHITE=$(tput setaf 7)
BOLD=$(tput bold)
NORMAL=$(tput sgr0)
RESET=$(tput sgr0)

currentage=0
previousage=0

if [[ $# -eq 0 || -z "$AGE" || -z "$RESOURCE" ]]
  then
  	echo 
    echo -e "${RED}Incorrect arguments supplied. Please supply a url, an age, and optionally, a host header entry. e.g: agetest.sh http://www.mydomain.com 300 www.mytest.com${WHITE}"
    echo 
    exit
fi


trap ctrl_c INT

function ctrl_c() {
		echo -e "\033[5B\033[2K"  
        echo "Exiting."
        echo -e $RESET
        exit
}

command="curl -Is $RESOURCE"
if [ -n "$HOST" ]; then 
	command="$command -H 'Host: $HOST'"
fi

echo 
echo 
echo -e "${GREEN}Resource: $RESOURCE"
echo "Target age: $AGE"
if [ -z "$HOST" ]; then
	echo  'Host: No Host Header supplied'
else
	echo  "Host: ${HOST}"
fi

echo "Command: $command"
echo 
echo -e "${WHITE}Testing:"

while [ "$currentage" -le "$AGE" ]; do 
	
	#clear
	eval response=\$\($command\)
	httpstatus=$(echo "$response" | grep HTTP/| awk '{$1=""; print $0}')
	httpstatus=${httpstatus##+([[:space:]])}; httpstatus=${httpstatus%%+([[:space:]])}
	currentage=$(echo "$response" | grep Age | awk {'print $2'})
	currentage=${currentage##+([[:space:]])}; currentage=${currentage%%+([[:space:]])}
	cachestatus=$(echo "$response" | grep X-Cache | awk '{$1=""; print $0}')
	cachestatus=${cachestatus##+([[:space:]])}; cachestatus=${cachestatus%%+([[:space:]])}

	if [[ $cachestatus != "Hit from cloudfront" && "$previousage" -gt 0 ]]
		then
		printf "\033[5B"  
		if [[ "$previousage" -eq "$AGE" || "$previousage" -eq "$AGE-1" ]]
		then
			echo -e "${GREEN}"
		else
			echo -e "${RED}"
		fi

		echo -e "Something other than a Cache Hit was detected. Response was: ${BOLD}$cachestatus${NORMAL}"
		exit
	fi

	if [ -z "$currentage" ]
		then
		currentage=0
	fi

	echo -e "${NORMAL}HTTP Status: ${BOLD}$httpstatus      "
	echo -e "${NORMAL}Age: ${BOLD}$currentage      "
	echo -e "${NORMAL}Cache status (X-Cache): ${BOLD}$cachestatus      "

	if [ $currentage -gt $AGE ]
		then 
			echo
	 		echo -e "${RED}Age breached. Target age: $AGE Reported age: $currentage${WHITE}"
	 		exit
	fi

	#Move up four lines
	echo -e "\033[4A" 

	sleep 1
	previousage=$currentage

done