Help to write the Monitor script

This one should do it:

!/bin/sh
 these arguments supplied automatically for all external pingers:
 $1 = IP (::ffff:nnn.nnn.nnn.nnn notation or hostname)
 $2 = port (decimal, host byte order)
 $3 and higher = additional arguments

 $MONITOR_NAME = name of the monitor

 In this sample script, $3 is the regular expression


 Name of the pidfile
pidfile="/var/run/$MONITOR_NAME.$1..$2.pid"

 Send signal to the process group to kill our former self and any children
 as external monitors are run with SIGHUP blocked
if [ -f $pidfile ]
then
   kill -9 -`cat $pidfile` > /dev/null 2>&1
fi

echo "$$" > $pidfile

 Remove the IPv6/IPv4 compatibility prefix
node_ip=`echo $1 | sed 's/::ffff://'`

 Using the nc utility to get data from the server.
 Search the data received for the expected expression.

count=$(echo -en "GET / HTTP/1.0\n\n\n\n" | nc $node_ip $2 2>/dev/null | egrep -v '200 OK' 2>/dev/null | tr -d -c 'OK' 2>/dev/null | awk '{ print length; }' 2>/dev/null)

if [ ! -z "$count" ]
then
    count=$(($count+0))
    if [ $count -gt 8 ]
    then
     Remove the pidfile before the script echoes anything to stdout and is killed by bigd
    rm -f $pidfile
    echo "up"
    fi
fi

 Remove the pidfile before the script ends
rm -f $pidfile

 END.

You need to modify it to put in the URI specific for your application.

Edit: The count should be 8 or greater.