如何使用asio执行非阻塞读取？

#include<iostream>
#include<boost/asio.hpp>

void read_handler(const boost::system::error_code& ec, std::size_t bytes_transferred) {
    if (!ec) {
        std::cout << "成功读取 "<< bytes_transferred << " 字节数据。"<< std::endl;
    } else {
        std::cout << "读取错误: " << ec.message()<< std::endl;
    }
}

int main() {
    boost::asio::io_context io_context;
    boost::asio::ip::tcp::socket socket(io_context);
    socket.connect(boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string("127.0.0.1"), 8080));

    boost::asio::streambuf buffer;
    std::ostream request_stream(&buffer);
    request_stream << "GET / HTTP/1.1\r\n";
    request_stream << "Host: 127.0.0.1\r\n";
    request_stream << "Connection: close\r\n\r\n";

    socket.write_some(buffer.data());

    buffer.consume(buffer.size());

    socket.async_read_some(buffer.prepare(1024), read_handler);

    io_context.run();

    return 0;
}