我可以从Actix-Web中间件获取响应正文并修改它吗？

use actix_web::{web, App, HttpResponse, HttpServer, Responder};
use actix_web::dev::{ServiceRequest, ServiceResponse};
use actix_web::middleware::Logger;
use futures::future::{ok, Ready};

async fn my_middleware(
    req: ServiceRequest,
    srv: web::Data<actix_web::web::Payload>,
) -> Result<ServiceResponse, actix_web::Error> {
    let mut res = req.into_response(HttpResponse::Ok().body("Original body"));

    // 获取响应正文
    let body = res.take_body();

    // 将响应正文转换为字符串
    let body_str = match body {
        actix_web::dev::ResponseBody::Body(actix_web::dev::Body::Bytes(bytes)) => {
            String::from_utf8(bytes.to_vec()).unwrap()
        }
        _ => String::new(),
    };

    // 修改响应正文
    let modified_body_str = format!("Modified body: {}", body_str);

    // 将修改后的正文设置回响应中
    res.set_body(actix_web::dev::ResponseBody::Body(modified_body_str.into()));

    Ok(res)
}

async fn index() -> impl Responder {
    HttpResponse::Ok().body("Hello, world!")
}

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| {
        App::new()
            .wrap(Logger::default())
            .wrap(my_middleware) // 使用自定义中间件
            .route("/", web::get().to(index))
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}