// <helpers>
use actix_web::{error, get, App, HttpServer};

#[derive(Debug)]
struct MyError {
    name: &'static str,
}

#[get("/")]
async fn index() -> actix_web::Result<String> {
    let result = Err(MyError { name: "test error" });

    result.map_err(|err| error::ErrorBadRequest(err.name))
}
// </helpers>

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| App::new().service(index))
        .bind(("127.0.0.1", 8080))?
        .run()
        .await
}