Again on Rocket.rs (built on hyper*), it has such a nice and expandable API, makes it super easy to add middleware like things on anything super simply in ways I haven’t seen before, in addition to guards, fallbacks, etc… I want Phoenix to absorb a few of it’s features (basically just need a Router and Controller replacement, a library could do it).
Warp is also fast growing, it’s more “thin” but super fast and easy to use.