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

use std::io;

use actix_http::{http::StatusCode, Error, HttpService, Request, Response};
use actix_server::Server;
use bytes::BytesMut;
use futures_util::StreamExt as _;
use http::header::HeaderValue;

#[actix_rt::main]
async fn main() -> io::Result<()> {
    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));

    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?);
                    }

                    log::info!("request body: {:?}", body);

                    Ok::<_, Error>(
                        Response::build(StatusCode::OK)
                            .insert_header((
                                "x-head",
                                HeaderValue::from_static("dummy value!"),
                            ))
                            .body(body),
                    )
                })
                .tcp()
        })?
        .run()
        .await
}