Netty server does not shutdown gracefully

[nimatrueway]

Tapir version: 1.5.5

Scala version: 2.13.11

Describe the bug

I could not find a way to gracefully shutdown tapir-netty server.

When you stop the server programatically, or send SIG_TERM signal to the process; it breaks the connection for in-flight requests.

val bindingF = NettyFutureServer().port(8080)...start()
val binding = Await.result(bindingF, 10.seconds)
Await.result(binding.stop(), 10.seconds)

However my expectation is for the server to:

• Not accept any more requests
• Finish in-flight requests

How to reproduce?

Reproduction scenario in a gist

Additional information

We maybe able to adopt a similar strategy as reactor-netty 🤔
https://github.com/reactor/reactor-netty/pull/1034/files