HTTP now has a designated pattern for checking server is responding.
How to use
To verify in your browser, browse to <http(s)://host__and_port>/config/authenticate/heartbeat/
You will see the host name of the server and get a status 200.
To customise the message show, set "heartBeatMessage" on the "com.phenixidentity~auth-http" module found in boot.json:
"heartBeatMessage":"it is alive",
Module "com.phenixidentity~auth-http" deployed.