zookeeper client go to dead loop if connection port is not listen

[dongweifly]

i write a demo as follow. if the port is not listened , Client try write socket in dead loop.
`use zookeeper::{ZooKeeper, Watcher, WatchedEvent};
use std::time::Duration;
use std::thread;

struct LoggingWatcher;
impl Watcher for LoggingWatcher {
fn handle(&self, e: WatchedEvent) {
println!("{:?}", e)
}
}

fn main() {
env_logger::init();
let url = "127.0.0.1:2081";
let zk = ZooKeeper::connect(url, Duration::from_secs(1), LoggingWatcher).unwrap();

loop {
    thread::sleep(Duration::from_secs(5));
}

}`

Screen print fail log in dead loop
[2022-09-20T08:57:59Z ERROR zookeeper::io] Failed to write socket: Os { code: 32, kind: BrokenPipe, message: "Broken pipe" }