CORS

CORS 中間件可以用於 跨源資源共享.

由於瀏覽器會發 Method::OPTIONS 的請求, 所以需要增加對此類請求的處理. 可以對根 Router 添加 empty_handler 一勞永逸地處理這種情況.

示例代碼

use salvo::cors::Cors;
use salvo::http::Method;
use salvo::prelude::*;

#[handler]
async fn hello() -> &'static str {
    "hello"
}

#[tokio::main]
async fn main() {
    tracing_subscriber::fmt().init();

    let cors_handler = Cors::new()
        .allow_origin("https://salvo.rs")
        .allow_methods(vec![Method::GET, Method::POST, Method::DELETE])
        .into_handler();

    let router = Router::with_hoop(cors_handler)
        .get(hello)
        .options(handler::empty());

    let acceptor = TcpListener::new("127.0.0.1:5800").bind().await;
    Server::new(acceptor).serve(router).await;
}

[package]
name = "example-cors"
version = "0.1.0"
edition = "2021"
publish = false


[dependencies]
salvo = { workspace = true, features=["cors"] }
tokio = { version = "1", features = ["macros"] }
tracing = "0.1"
tracing-subscriber = "0.3"