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All snark aside, is there potential benefit to Varnish Cache with this becoming widely adopted? Things that could only be accomplished at lower layers like this implies access to?

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Since there is already highly efficient event driven I/O and a context switch is bound to happen for applications that require major business logic in user space, I doubt there will be huge benefits for large server applications.

Maybe simplified versions work with this paradigm with significant performance gains, but I doubt that you could simply plug Varnish or nginx in and see much of an improvement.

There is still quite a complexity gap between e.g. interpreting firewall filter rules and a full blown web reverse proxy..

I think you could use this to generate a reverse proxy for the current config in nginx, maybe if only for some subset of configurations. Like a fast path for common flows. But it wouldn't be easy.

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