Is your feature request related to a problem? Please describe.

Admin interface (and api in general) is currently served via HTTP1.1.

Describe the solution you'd like.

What would the feature look like? How would it work? How would it change the API?

It would be nice to have api serve HTTP2 as well (as H2C). (I've seen that you already optionally support QUIC/HTTP3, so H2C/HTTP2 would be even simpler as it's just a wrapper over mux.

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