Perhaps the most widely known web framework for Rust is Rocket. It started as a one-man project and gradually evolved into a simple, elegant, and fast framework over the last year or so. Rocket focuses a lot on simplicity, something that a lot of Flask users will appreciate. Like Flask uses python decorators to declare routes, Rocket uses custom attributes to the same effect. Unfortunately, this means that Rocket has to make heavy use of nightly-only features. Thus, as of now, Rocket applications can only be built using nightly Rust. However, as more and more things are stabilized (moved to stable Rust), this restriction will eventually go away.
Let us start with a basic example of Rocket, beginning with setting up the project:
$ cargo new --bin rocket-simple
Our Cargo setup needs to add Rocket components as dependencies, and should look like this: