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499 responses in access log

Hi, why do we return 499 status code?

1-2 times per day our server returns 499 status code with response time about 5 sec. After this, all workers go busy and we star returning 502 status codes.

What does mean 499 from our side and how could we debug this?

thanks

499 might mean "the client has closed the request before the server could send a response". What do you see in other logs of your web app for those timestamps?