How to use actix-web crate in Rust web framework

Crates/Actix-Web

2026-04-17T12:05:42+00:00

Install actix-web via Cargo and define an async handler function to route HTTP requests.

Add the actix-web dependency to your Cargo.toml and define an async handler function to process HTTP requests.

[dependencies]
actix-web = "4"

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

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

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