Hello,
>
> The error indicate that your backend server closed the connection.
> That's more less all nginx knows, so if you want to find out why
> your backend did this - consider looking into the backend.
>
i found the problem, there is by default a 180s timeout on my backend.
> Could you please double-check that the behaviour you describe
> appears when using nginx 1.13.2 and with proxy_next_upstream
> switched off?
effectively, i tested proxy_next_stream off only on nginx/1.10.3 so i will confirm if same behavior on nginx/1.13.2
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