代码

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#include <string>
#include <memory>
#include <iostream>
#include "boost/asio.hpp"

class HttpConnect : public std::enable_shared_from_this<HttpConnect>
{
public:
    HttpConnect(boost::asio::io_context& io) : m_socket(io) {}
    ~HttpConnect(){}
    void RunOnce()
    {
        auto sphc = shared_from_this();
        boost::asio::async_read_until(m_socket, boost::asio::dynamic_buffer(m_szRequest), "\r\n\r\n",
            [sphc, this](const boost::system::error_code& err, size_t length) {
                if (err)
                {
                    std::cout << "async_read_until error:" << err.message() << '\n';
                    return;
                }
                std::cout << "Request length: " << length << '\n';
                std::cout << m_szRequest << '\n';

                const char cszHtml[]{ "HTTP/1.0 200 OK\r\n\r\n<html>hello word!!!</html>\r\n" };
                boost::asio::async_write(m_socket, boost::asio::buffer(cszHtml), [sphc, this](const boost::system::error_code& err, size_t length){
                    std::cout << "write length: " << length << '\n';
                    if (err)
                    {
                        std::cout << "async_write error:" << err.message() << '\n';
                    }
                    m_socket.close();
                    }
                ); // async_write
            }
        );// async_read_until
    }
    boost::asio::ip::tcp::socket& Socket() { return m_socket; }
private:
    boost::asio::ip::tcp::socket m_socket;
    std::string m_szRequest;
};

class SimpleHttpServer
{
public:
    SimpleHttpServer(boost::asio::io_context& io, boost::asio::ip::tcp::endpoint ep) : m_ioContext(io), m_acceptor(io, ep) {}
    ~SimpleHttpServer(){}
    void StartAccept()
    {
        auto sphc = std::make_shared<HttpConnect>(m_ioContext);
        m_acceptor.async_accept(sphc->Socket(), [sphc, this](const boost::system::error_code& err) {
            if (err)
            {
                std::cout << "async_accept error:" << err.message() << '\n';
                return;
            }
            sphc->RunOnce();
            StartAccept();
            }
        );// async_accept
    }
private:
    boost::asio::io_context& m_ioContext;
    boost::asio::ip::tcp::acceptor m_acceptor;
};
// 
int main()
{
    unsigned short nPort{ 8866 };
    boost::asio::ip::address address(boost::asio::ip::make_address("127.0.0.1"));

    boost::asio::io_context io;
    boost::asio::ip::tcp::endpoint ep(address, nPort);
    SimpleHttpServer httpServer(io, ep);
    httpServer.StartAccept();
    io.run();
    return 0;
}