lifespan: Return required?

[AstraLuma]

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The example lifespan application exits after the lifespan.shutdown event but this behavior is not specified in the actual text of the specification.

It's actually not super-clear in the asgi specification how it should be handled.

[andrewgodwin]

I don't believe I have an opinion on this, thinking about it - it doesn't really matter, since the server will exit anyway (though most provide a grace period to allow applications to exit before they shut down).

If you want, I'd take a PR suggesting they should try to exit, providing nobody else disagrees.

[lovelydinosaur]

Not sure if it needs to be specified, but it'd be a reasonable assumption that:

• Applications shouldn't do anything else after after the lifespan.shutdown messages.
• Servers should probably wait for the application lifespan task to complete, for cleanness.

[Kludex]

It doesn't matter. There's no ambiguity on the ecosystem regarding this.

Can we close this?