如何用actix获取文本形式的请求体？

[dependencies]
actix-web = "3.0"

use actix_web::{web, App, HttpRequest, HttpServer};

async fn handle_request(req: HttpRequest) -> String {
    let body = req.body().await.unwrap();
    let text = String::from_utf8(body.to_vec()).unwrap();
    text
}

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| {
        App::new()
            .service(web::resource("/").route(web::post().to(handle_request)))
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}