Rust Hello World

Create a new project and edit src/main.rs:

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

#[derive(Serialize)]
struct Message {
    message: String,
}

#[get("/")]
async fn hello() -> impl Responder {
    HttpResponse::Ok().json(Message {
        message: "Hello World".to_string(),
    })
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| App::new().service(hello))
        .bind(("0.0.0.0", 8080))?
        .run()
        .await
}

Update Cargo.toml dependencies:

[dependencies]
actix-web = "4"
serde = { version = "1", features = ["derive"] }

Run it locally:

cargo run

curl http://localhost:8080
# {"message":"Hello World"}

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