use actix_web::{web, get, App, HttpServer, 
Responder, HttpResponse};

#[get("/")]
async fn hello_world() -> HttpResponse {
    HttpResponse::Ok().json("Hello, World")
}

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