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OK, that makes it clear, because for example Rails require existing Web server in contrast.

I this is quite similar to Rails; by default Rails includes webbrick or puma.

OK, browsing through their code, I see they use Hyper.

But they're still on the previous, non-Tokio release.

Personally I'm more tempted by something like Susanoo: https://github.com/ubnt-intrepid/susanoo/