Rust Iron minimal API

Cargo.toml

[package]
name = "iron"
version = "0.1.0"
authors = ["snobu <foo@snobu.org>"]
edition = "2018"

[dependencies]
iron = "*"
rustc-serialize = "*"
chrono = "*"

main.rs

extern crate iron;
extern crate rustc_serialize;
extern crate chrono;

use iron::prelude::*;
use iron::status;
use rustc_serialize::json;
use chrono::Utc;

#[derive(RustcEncodable)]
struct Greeting {
    msg: String,
    when: String
}

fn main() {
    fn hello_world(_: &mut Request) -> IronResult<Response> {
        let greeting = Greeting {
            msg: "Rust says hi.".to_string(),
            when: Utc::now().to_rfc2822().to_string()
        };
        let payload = json::encode(&greeting).unwrap();
        Ok(Response::with((status::Ok, payload)))
    }

    Iron::new(hello_world).http("localhost:3000").unwrap();
    println!("On 3000");
}