Rust actix spa example

actix.rs

// Quick and dirty way to run spa apps on rust actix server
use dotenvy::dotenv;
use std::env;
use actix_web::{HttpServer, App, Result};
use actix_web::dev::{ServiceRequest, ServiceResponse};
use actix_files as a_fs;

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    dotenv().ok();

    let host = env::var("HOST").expect("HOST must be set");
    let port = env::var("PORT").expect("PORT must be set").parse::<u16>().expect("PORT must be a number");
    HttpServer::new(|| {
        App::new()
        .service(a_fs::Files::new("/", "[SPA DIR]").index_file("index.html").default_handler(index))
    })
        .bind((host, port))?
        .run()
        .await
}

async fn index(reqs: ServiceRequest) -> Result<ServiceResponse> {
    let (req, _) = reqs.into_parts();
    let file = a_fs::NamedFile::open_async("[SPA DIR]/index.html").await?;
    let res = file.into_response(&req);
    Ok(ServiceResponse::new(req, res))
}