Dose the lines interator of BufReader of TcpStream never return None?

help
1

I'm learning Rust with the document on the official website.
I'm reading the part whose title is Build a Single-Thread Web Server.
The example code is

fn handle_connection(mut stream: TcpStream) {
    let buf_reader = BufReader::new(&mut stream);
    let http_request: Vec<_> = buf_reader
        .lines()
        .map(|result| result.unwrap())
        .take_while(|line| !line.is_empty())
        .collect();

    println!("Request: {:#?}", http_request);
}

But when I use the filter() instead of the take_while(), the thread will being blocked.

Isn't it like the title says, the lines iterator doesn't return None?

2

It will return None when the incoming stream is closed (which isn't representative of a web request).