how to implement simple http2 server #2898

amirhosseinvz94 · 2022-06-20T16:20:22Z

amirhosseinvz94
Jun 20, 2022

my server code is:

use std::{convert::Infallible, net::SocketAddr};
use hyper::{Body, Request, Response, Server};
use hyper::service::{make_service_fn, service_fn};

async fn handle(_: Request<Body>) -> Result<Response<Body>, Infallible> {
    Ok(Response::new("Hello, World!".into()))
}

#[tokio::main]
async fn main() {
    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));

    let make_svc = make_service_fn(|_conn| async {
        Ok::<_, Infallible>(service_fn(handle))
    });

    let server = Server::bind(&addr).http2_only(true).serve(make_svc);

    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
}

and i use curl for client:

curl --http2 http://localhost:3000 -o /dev/null -vv

but not work and the curl output is:

* Expire in 0 ms for 6 (transfer 0x55f169b7d010)
* Expire in 1 ms for 1 (transfer 0x55f169b7d010)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Expire in 0 ms for 1 (transfer 0x55f169b7d010)
* Expire in 0 ms for 1 (transfer 0x55f169b7d010)
*   Trying ::1...
* TCP_NODELAY set
* Expire in 149999 ms for 3 (transfer 0x55f169b7d010)
* Expire in 200 ms for 4 (transfer 0x55f169b7d010)
* connect to ::1 port 3000 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Expire in 149999 ms for 3 (transfer 0x55f169b7d010)
* Connected to localhost (127.0.0.1) port 3000 (#0)
> GET / HTTP/1.1
> Host: localhost:3000
> User-Agent: curl/7.64.0
> Accept: */*
> Connection: Upgrade, HTTP2-Settings
> Upgrade: h2c
> HTTP2-Settings: AAMAAABkAARAAAAAAAIAAAAA
> 
{ [21 bytes data]
* Recv failure: Connection reset by peer
100    21    0    21    0     0   7000      0 --:--:-- --:--:-- --:--:--  7000
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer

seanmonstar · 2022-06-20T23:57:01Z

seanmonstar
Jun 20, 2022
Maintainer

You need to tell curl to use --http2-prior-knowledge. The --http2 option uses TLS ALPN, which you would need to setup on your server. But hyper can do HTTP/2 without TLS.

2 replies

amirhosseinvz94 Jun 21, 2022
Author

thanks, i know that, but why hyper does not support TLS ALPN, because it is necessary features in any web server to handle clients default behavior(oldest browser or anything)

seanmonstar Jun 21, 2022
Maintainer

hyper doesn't pick a TLS implementation, you need to pick one. You could use openssl, rustls, native-tls, or any other, and configure its server config to advertise h2 in its ALPN options. Then it would work.

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