Start the WebHCat server and log in as $WEBHCAT_USER:

su - $WEBHCAT_USER 
export HADOOP_HOME=/usr/hdp/current/hadoop-client
/usr/hdp/current/hive-webhcat/sbin/webhcat_server.sh  start

Type the following URL into your browser:

http://$WebHCat.server.full.hostname:50111/templeton/v1/status

The following message is returned if your installation is valid:

{"status":"ok","version":"v1"}