fix: auto conn infinite loop if conn closed before send full bytes

[chrislearn]

We cannot assume that the client will definitely send 24 bytes.

• If the client closes the connection before sending 24 bytes, the loop will not exit, but will be awakened infinitely, causing the current thread to fill up the core of the current CPU.
• If the client does not disconnect but does not send the full 24 bytes, it cannot be determined whether it is http1 or http2, resulting in infinite waiting. For example:

use std::{net::{TcpStream},io::{Error, Write, Read}};
fn main()->Result<(),Error> {
    let mut conn = TcpStream::connect("127.0.0.1:5800")?;
    println!("connection ok");
    let write_content = b"GET / HTTP/1.1\r\n\r\n";
    conn.write(write_content)?;
    println!("write ok");
    let mut vec = Vec::new();
    vec.resize(1024 * 1024, b'\0');
    let read_size = conn.read(& mut vec[..])?;
    println!("{read_size}");
    println!("{}",std::str::from_utf8(&vec[..read_size]).unwrap());
    Ok(())
}

Such code will cause the client to not get the data returned by the server.