Check URL response code and notify it to slack

check_url.sh

#!/bin/bash

# The URL you want to check
url="HTTP_MY_AWESOME_URL"
status_code=$(curl -o /dev/null --silent --head --write-out '%{http_code}\n' $url)
date=`date`

# The channel or user you want to notify
channel="MY_CHANNEL"
# The displayed bot username
username="BOT_USERNAME"
# Your slack Webhook URL
webhook_url="SLACK_WEBHOOK_URL"

if [ $status_code -ne "200" ]
then
   text="status check failed for $url at $date : status code $status_code returned"
   escapedText=$(echo $text | sed 's/"/\"/g' | sed "s/'/\'/g" )
   json="{\"channel\": \"$channel\", \"username\":\"$username\", \"icon_emoji\":\"ghost\", \"attachments\":[{\"color\":\"danger\" , \"text\": \"$escapedText\"}]}"
else
   text="status check ok for $url at $date : status code $status_code returned"
   escapedText=$(echo $text | sed 's/"/\"/g' | sed "s/'/\'/g" )
   json="{\"channel\": \"$channel\", \"username\":\"$username\", \"icon_emoji\":\"ghost\", \"attachments\":[{\"color\":\"good\" , \"text\": \"$escapedText\"}]}"
fi

curl -s -d "payload=$json" "$webhook_url"