Send log to graylog with authentication

we want to send a log from the client to graylog over gelf Http input.
we have public ip, so to send log we want authentication.
our address is http://ip-public-graylog:12202/gelf, this case anyone with our address can send log!!
How can we consider ‍authentication for sending data?

thanks.

Why not side car an API Gateway technology like Kong or other products to help provide the TLS and Auth, Graylog’s doc’s mention that as one good idea.

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