Hyper server hangs when handling a request from a client on the same host (not necessarily the same process)

[haydnv]

Version
hyper 1.2
futures 0.3
http_body_util 0.1
hyper_util 0.1
tokio 1.36 with the macros, net, and rt-multi-thread features

Platform
Linux x86_64

Description
A Hyper server task hangs at http1::Builder::new().serve_connection(io, service), where io is a hyper_util::TokioIo wrapping a tokio::net::TcpStream and service is constructed with hyper::service::service_fn. Here is a minimal reproducible example: https://gist.github.com/haydnv/9ed45169963a61c8a18aca341b3b3044

I expect that the test client will receive a "Hello, World!" response from the test server exactly once, but what actually happens is that the server task hangs at http1::Builder::serve_connection. Let me know if I can provide any more information to help debug this issue.

[seanmonstar]

The hang comes from L86. You're awaiting the client connection, and trying to send a request after that. When the client connection future completes, that means the connection is closed. You usually want to spawn the connection into a new task.

[haydnv]

Got it, thanks!