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Prevent NGINX from rerouting to a backend that was previously down

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I'm using NGINX's ip_hash directive to ensure that client requests always
end up at the same backend server. In the case of a backend server outage,
NGINX will reroute to the available server, and since I can listen for a
disconnection event on my client application, I can have my client-side
application react accordingly. However, when the previously down server
comes back up, NGINX will route requests back to the original server. This
breaks my application, as I have no way of knowing that this happens from my
client-side application.

So is there a way for NGINX to send a notification event to my client-side
app when it detects that a previously down server is available, or
preferably prevent NGINX from exhibiting this behavior?

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