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139 lines
4.3 KiB
Markdown
139 lines
4.3 KiB
Markdown
# axum
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`axum` is a web application framework that focuses on ergonomics and modularity.
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[](https://github.com/tokio-rs/axum/actions/workflows/CI.yml)
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[](https://crates.io/crates/axum)
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[](https://docs.rs/axum)
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More information about this crate can be found in the [crate documentation][docs].
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## High level features
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- Route requests to handlers with a macro free API.
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- Declaratively parse requests using extractors.
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- Simple and predictable error handling model.
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- Generate responses with minimal boilerplate.
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- Take full advantage of the [`tower`] and [`tower-http`] ecosystem of
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middleware, services, and utilities.
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In particular the last point is what sets `axum` apart from other frameworks.
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`axum` doesn't have its own middleware system but instead uses
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[`tower::Service`]. This means `axum` gets timeouts, tracing, compression,
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authorization, and more, for free. It also enables you to share middleware with
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applications written using [`hyper`] or [`tonic`].
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## Usage example
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```rust
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use axum::{prelude::*, response::IntoResponse, http::StatusCode};
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use serde::{Deserialize, Serialize};
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use std::net::SocketAddr;
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#[tokio::main]
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async fn main() {
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// initialize tracing
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tracing_subscriber::fmt::init();
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// build our application with a route
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let app =
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// `GET /` goes to `root`
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route("/", get(root))
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// `POST /users` goes to `create_user`
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.route("/users", post(create_user));
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// run our app with hyper
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// `axum::Server` is a re-export of `hyper::Server`
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let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
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tracing::debug!("listening on {}", addr);
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axum::Server::bind(&addr)
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.serve(app.into_make_service())
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.await
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.unwrap();
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}
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// basic handler that responds with a static string
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async fn root() -> &'static str {
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"Hello, World!"
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}
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async fn create_user(
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// this argument tells axum to parse the request body
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// as JSON into a `CreateUser` type
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extract::Json(payload): extract::Json<CreateUser>,
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) -> impl IntoResponse {
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// insert your application logic here
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let user = User {
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id: 1337,
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username: payload.username,
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};
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// this will be converted into an JSON response
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// with a status code of `201 Created`
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(StatusCode::CREATED, response::Json(user))
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}
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// the input to our `create_user` handler
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#[derive(Deserialize)]
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struct CreateUser {
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username: String,
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}
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// the output to our `create_user` handler
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#[derive(Serialize)]
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struct User {
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id: u64,
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username: String,
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}
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```
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See the [crate documentation][docs] for way more examples.
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## Performance
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`axum` is a relatively thin layer on top of [`hyper`] and adds very little
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overhead. So `axum`'s performance is comparable to [`hyper`]. You can find a
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benchmark [here](https://github.com/programatik29/rust-web-benchmarks).
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## Safety
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This crate uses `#![forbid(unsafe_code)]` to ensure everything is implemented in
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100% safe Rust.
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## Examples
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The [examples] folder contains various examples of how to use `axum`. The
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[docs] also have lots of examples
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## Getting Help
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In the `axum`'s repo we also have a [number of examples][examples] showing how
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to put everything together. You're also welcome to ask in the [Discord
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channel][chat] or open an [issue] with your question.
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## Contributing
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:balloon: Thanks for your help improving the project! We are so happy to have
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you! We have a [contributing guide][guide] to help you get involved in the
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`axum` project.
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## License
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This project is licensed under the [MIT license](LICENSE).
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in `axum` by you, shall be licensed as MIT, without any
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additional terms or conditions.
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[examples]: https://github.com/tokio-rs/axum/tree/master/examples
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[docs]: https://docs.rs/axum
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[`tower`]: https://crates.io/crates/tower
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[`hyper`]: https://crates.io/crates/hyper
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[`tower-http`]: https://crates.io/crates/tower-http
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[`tonic`]: https://crates.io/crates/tonic
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[guide]: CONTRIBUTING.md
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[chat]: https://discord.gg/tokio
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[issue]: https://github.com/tokio-rs/axum/issues/new
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[`tower::Service`]: https://docs.rs/tower/latest/tower/trait.Service.html
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