SpringBoot Add server.netty.max-keep-alive-requests

A new maxKeepAliveRequests property was added to the http server in reactor-netty v1.0.13 (https://github.com/reactor/reactor-netty/issues/1865 / https://github.com/reactor/reactor-netty/pull/1867)

It would be great if spring boot allowed the maxKeepAliveRequests to be configured via a server.netty.max-keep-alive-requests property, similar to the other reactor-netty server properties.

Comment From: philwebb

Closing in favor of PR #28875. Thanks @polarbear567!