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

use std::{env, io};

use actix_http::{Error, HttpService, Request, Response};
use actix_server::Server;
use bytes::BytesMut;
use futures::StreamExt;
use http::header::HeaderValue;
use log::info;

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()
                .client_timeout(1000)
                .client_disconnect(1000)
                .finish(|mut req: Request| {
                    async move {
                        let mut body = BytesMut::new();
                        while let Some(item) = req.payload().next().await {
                            body.extend_from_slice(&item?);
                        }

                        info!("request body: {:?}", body);
                        Ok::<_, Error>(
                            Response::Ok()
                                .header(
                                    "x-head",
                                    HeaderValue::from_static("dummy value!"),
                                )
                                .body(body),
                        )
                    }
                })
        })?
        .run()
}