I have a use case where a client is invoking a Rest endpoint via a load balancer, which in turn invokes a third party endpoint which is really slow to respond. The third party endpoint takes over 1 min to start sending the response. Because of this the client is getting 504 Gateway timeout due to the connection being idle for more than 60 seconds. We don’t want to alter the configuration of load balancer’s keep alive timeout rather want the Rest endpoint to send some keep alive data packets periodically till the data from third party endpoint is available ensuring that the connection is not idle for long time.

I can implement this by generating a Flux which periodically checks for data availability and returns a dummy packet till the data from third party endpoint is available.
Wanted to know if the same can be achieved just with some out of the box configuration. The goal is to just ensure that the connection does not remain idle till we have data available from the third part endpoint