如何在Rust Axum中获取完整请求URI（scheme+authority+path）

我尝试获取包含scheme、authority和path的完整请求URI，先后用两种方式实现，但都只得到路径部分，调用scheme_str()和authority()时返回None，触发unwrap() panic。

尝试一：通过Request实现 #

use axum::body::Body;
use axum::http::Request;
use axum::routing::get;
use axum::Router;

async fn handler(req: Request<Body>) -> &'static str {
    println!("The request is: {}", req.uri());
    println!("The request is: {}", req.uri().scheme_str().unwrap());
    println!("The request is: {}", req.uri().authority().unwrap());

    "Hello world"
}

#[tokio::main]
async fn main() {
    let app = Router::new().route("/test", get(handler));

    axum::Server::bind(&"0.0.0.0:8080".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

运行命令：

curl -v "http://localhost:8080/test"

仅打印路径/test，并触发panic：

thread 'tokio-runtime-worker' panicked at 'called `Option::unwrap()` on a `None` value', src/main.rs:8:59

尝试二：通过Uri提取器实现 #

use axum::http::Uri;
use axum::routing::get;
use axum::Router;

async fn handler(uri: Uri) -> &'static str {
    println!("The request is: {}", uri);
    println!("The request is: {}", uri.scheme_str().unwrap());
    println!("The request is: {}", uri.authority().unwrap());

    "Hello world"
}

#[tokio::main]
async fn main() {
    let app = Router::new().route("/test", get(handler));

    axum::Server::bind(&"0.0.0.0:8080".parse().unwrap())
        .serve(app.into_make_service())
        .await
        .unwrap();
}

运行相同的curl命令后，同样只得到路径，触发相同panic。

运行环境 #

• cargo 1.68.0-nightly (2381cbdb4 2022-12-23)
• rustc 1.68.0-nightly (ad8ae0504 2022-12-29)

Cargo.toml依赖 #

[package]
name = "axum_test"
version = "0.1.0"
edition = "2021"

[dependencies]
axum = "0.6.10"
tokio = { version = "1.26.0", features = ["macros", "rt-multi-thread"] }

内容的提问来源于stack exchange，提问作者mepmerp