Multiple errors getting printed when a single error occurs.

[MaximalCats]

Hello everyone,

Just wanted to know if anyone knows a way to disable this behaviour? I'm not completely sure whether this is a bug.

use http_body_util::Full;
use hyper::{body::{Bytes, Incoming}, server::conn::http1, service::service_fn, Request, Response};
use hyper_util::rt::TokioIo;
use log::error;
use std::{
    error::{self, Error}, net::{IpAddr, SocketAddr}, str::FromStr
};
use tokio::{fs::File, io::AsyncReadExt, net::TcpListener};
use yaml_rust::{Yaml, YamlLoader};

async fn test(req: Request<Incoming>) -> Result<Response<Full<Bytes>>, hyper::Error>{
    panic!("hello, i am an error beep boop")
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    pretty_env_logger::init();

    let addr = SocketAddr::new(
        IpAddr::from_str("127.0.0.1").unwrap(),
        8006 ,
    );

    let listener = TcpListener::bind(addr).await?;

    loop {
        let (stream, _) = listener.accept().await?;

        let io = TokioIo::new(stream);

        tokio::task::spawn(async move {
            if let Err(err) = http1::Builder::new().serve_connection(io, service_fn(test)).await {
                error!("Error while trying to serve connection: {}", err.source().unwrap())
            }
        });
    }
}

// Multiple errors seem to get printed here, even though there has only been a single request.

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

thread 'tokio-runtime-worker' panicked at src/main.rs:12:5:
hello, i am an error beep boop

Same also happens when I return any errors by passing it to Err(). I'm thinking it might have something to do with tokio?

Thanks!

[seanmonstar]

Are you certain there's no other connections or requests? hyper isn't doing anything extra here, it just calls your service function when a request is received.

[MaximalCats]

Seems like Librewolf/Firefox is making extra requests. Using curl does actually just print a single error.