Restart service if an url doesn't works (doesn't return 200 http status). In this example I restart an Apache Tomcat service.

restart.sh

#!/bin/bash
#service monitoring
#check if the url responds 200 in 60 seconds
timeout -s SIGTERM 60 curl -I  https://youurl.com | grep '200 OK'
#> /dev/null
a=$(echo $?)
if test $a -ne 0
then
echo "tried to restart" > laststatus.txt
echo "restart tomcat service"
echo  "restarted at $(date)" >> lastrestarts.log
service tomcat stop
#kill tomcat to be sure, that the service will stop. You can commit this line.
kill -9 $(jps | grep 'Bootstrap' | awk '{print $1}')
#restart the service
service tomcat start
else
echo "tomcat service running"
fi