Function is_benign_close

crates/openshell-supervisor-network/src/l7/rest.rs:2395–2402

Check if an IO error represents a benign connection close. TLS peers commonly close the socket without sending a `close_notify` alert. Rustls reports this as `UnexpectedEof`, but it's functionally equivalent to a clean close when no request data has been received yet.

(err: &std::io::Error)

/// Rustls reports this as `UnexpectedEof`, but it's functionally equivalent
/// to a clean close when no request data has been received yet.
fn is_benign_close(err: &std::io::Error) -> bool {
    matches!(
        err.kind(),
        std::io::ErrorKind::UnexpectedEof
            | std::io::ErrorKind::ConnectionReset
            | std::io::ErrorKind::BrokenPipe
    )
}

#[cfg(test)]
#[allow(