Exploring async and await with web programming

Knowing what we know about async programming, we can now see the main function in our web application in a different light, as follows:

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new( || {
        App::new()
        .route("/", web::get().to(greet))
        .route("/{name}", web::get().to(greet))
        .route("/say/hello", web::get().to(|| 
               async { "Hello Again!" }))
    })
    .bind("127.0.0.1:8080")?
    .workers(3)
    .run()
    .await
}

We know that our greet function is...