actix-web/actix-http/examples/echo2.rs

use std::{env, io};

use actix_http::http::HeaderValue;
use actix_http::{error::PayloadError, Error, HttpService, Request, Response};
use actix_server::Server;
use bytes::BytesMut;
use futures::{Future, Stream};
use log::info;

fn handle_request(mut req: Request) -> impl Future<Item = Response, Error = Error> {
    req.take_payload()
        .fold(BytesMut::new(), move |mut body, chunk| {
            body.extend_from_slice(&chunk);
            Ok::<_, PayloadError>(body)
        })
        .from_err()
        .and_then(|bytes| {
            info!("request body: {:?}", bytes);
            let mut res = Response::Ok();
            res.header("x-head", HeaderValue::from_static("dummy value!"));
            Ok(res.body(bytes))
        })
}

fn main() -> io::Result<()> {
    env::set_var("RUST_LOG", "echo=info");
    env_logger::init();

    Server::build()
        .bind("echo", "127.0.0.1:8080", || {
            HttpService::build().finish(|_req: Request| handle_request(_req))
        })?
        .run()
}