https://actix.rs/

A pretty good rust web framework.

use std::net::TcpListener;

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

async fn health_check() -> impl Responder {
        HttpResponse::Ok().finish()
}

pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
        let server = HttpServer::new(|| {
                App::new()
                        .route("/health_check", web::get().to(health_check))
        })
        .listen(listener)?
        .run();
        Ok(server)
}