Authentication Exception Http Status Code Issue

[Gayatri-Alluri]

In OCPP 1.6, as CSMS implementors we are going for OCPP 1.6 certification. During testing when Charger Authentication failed with user name and password we are throwing Authentication Exception. Here the HTTP status code returned from library is 404. But if authentication failed the charger is expecting 401 status code instead of 404. How to handle it. Any other exception class I have to use instead of Authentication Exception. Please help on this.