nagios check for parsing the body of the http response for a detailed message

check_http_echo_body.sh

#!/bin/bash

#check input parameters
if [ -z $1 ]; then
  echo "Usage: $0 <url>"
  exit 3
fi

#url to check
checkurl=$1

#get web content
response=$(wget -qO - $checkurl)
if [ $? -ne 0 ]; then
  echo "UNKNOWN - error while running wget $checkurl"
  exit 3
fi

#get text within body tag
response=$(echo $response|sed 's/.*<body[^>]*>\(.*\)<\/body>.*/\1/')

#print response as it is
echo $response

#use exit codes depending on response
if [[ "$response" = *WARNING* ]]; then exit 1; fi
if [[ "$response" = *CRITICAL* ]]; then exit 2; fi
if [[ "$response" = *OK* ]]; then exit 0; fi

#anything else will treated as UNKNOWN
exit 3