Rust:axum learning notes (1) Hello World

axum yes Rust Ecological web Framework rookie , Although the project was established soon , but github Upper star Number exceeded 2.8k, Its bottom layer depends on high performance Tokio,Tokio I won't say much about this product , To borrow You know 《 Explain profound theories in simple language Rust Asynchronous programming Tokio》 Last picture ：

Rust Medium Tokio It is almost the performance ceiling of similar frames , and axum stay Tokio Build on , The starting point is on the shoulders of giants .

Let's have one first Hello World How to get started with ：

[dependencies]
axum="0.4.3"
tokio = { version = "1.0", features = ["full"] }

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After adding the above dependencies , You can code it ：

use axum::{
    routing::get,
    Router,
};


#[tokio::main]
async fn main() {
    // build our application with a single route
    let app = Router::new().route("/", get(|| async { "Hello, World!" }));

    // run it with hyper on localhost:3000
    axum::Server::bind(&"0.0.0.0:3000".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

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After starting , Run in the browser ：

Add a few more routes ：

use axum::{routing::get, Router};

#[tokio::main]
async fn main() {
    // our router
    let app = Router::new()
        .route("/", get(root))
        .route("/foo", get(get_foo).post(post_foo))
        .route("/foo/bar", get(foo_bar));

    // run it with hyper on localhost:3000
    axum::Server::bind(&"0.0.0.0:3000".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

// which calls one of these handlers
async fn root() -> String {
    String::from("hello axum")
}
async fn get_foo() -> String {
    String::from("get:foo")
}
async fn post_foo() -> String {
    String::from("post:foo")
}
async fn foo_bar() -> String {
    String::from("foo:bar")
}

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Be careful :/foo At the same time, it binds GET And POST Method routing . You can test ：