Specific CURL command is Automatically run in the System

We are new to Rancher Kubernetes. We noticed that below commands are triggered by the system automatically? Is this a normal kubernetes behavior? Seems like this is checking the health of the application.

curl -k --head --write-out %{http_code} --silent --output /dev/null https://127.0.0.1:9443/idswebapp/

May I know where we can find above command in the kubernetes object manifest?