Rocket is nice but I had a much, much better experience with Warp[0]. I ran into a lot of roadblocks with Rocket, especially with stuff like JWT and working with databases. No such issues with Warp.

0: https://github.com/seanmonstar/warp

I'm curious about both, and Rust for APIs in general. While I'm excited by the expressiveness of the language (compared to e.g. Go) and how robust the type system is. Right now, though it feels like a bit too much of a barrier both in terms of learning the language and the smaller ecosystem right now (this article covers a lot of my concerns: https://macwright.com/2021/01/15/rust.html). Still keeping an eye on it and would gravitate towards it if I had a smaller service that needed particularly high performance.