nginx close connection event

Question

Nginx

Suppose there is such a situation:
the Client opens a connection, sends data, the formation of a response begins, and then, suddenly, the connection breaks, before the response has yet been formed/completely sent.
It is necessary to make logging of such events.

Answer 1

what happens in the logs?

Answer 2

Such situations are already logged in nginx - error code 499. I quickly googled the branch