Rust - Iron - minimal web server with extra Header (Stackoverflow)

// Stackoverflow: [Staging Ground: Petit soucis en compilation sur Rust - Stack Overflow](https://stackoverflow.com/staging-ground/79907982)

use iron::prelude::*;
use iron::status;
use iron::headers::ContentType;
use iron::modifiers::Header;

fn main() {
    println!("Server running at http://localhost:3000");
    Iron::new(get_form).http("localhost:3000").unwrap();
}

fn get_form(_req: &mut Request) -> IronResult<Response> {
    Ok(Response::with((
        status::Ok,
        Header(ContentType::html()),
        "<h1>Hello</h1>"
    )))
}