NetScaler-13.1-Warning "is_whitelisted_request - Dropping invalid http request" in ns.log

You may see warning message like below in ns.log and would like to know why this log exists. Aug 12 16:50:25 X.X.X.X 08/12/2024:07:50:25 GMT XXX 0-PPE-2 : default SSLVPN Message 918225 0 :"iswhitelistedrequest - Dropping invalid http request:|/v1|"...