如何用C++实现一个简单的HTTP服务器？Asio库网络编程实战【网络库】

#include <asio.hpp>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
<p>using asio::ip::tcp;</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/6e7abc4abb9f" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">C++免费学习笔记（深入）</a>”；</p><p>std::string make_http_response(const std::string& path) {
if (path == "/") {
return "Hello, World!";
} else if (path == "/hello") {
return "Hi there from C++ HTTP server!";
} else {
return "404 Not Found";
}
}</p><p>int main() {
try {
asio::io_context io;
tcp::acceptor acceptor(io, tcp::endpoint(tcp::v4(), 8080));
std::cout << "HTTP server listening on <a href="https://www.php.cn/link/c94b9c32bee1951814f79c9646777742">https://www.php.cn/link/c94b9c32bee1951814f79c9646777742</a>";</p><pre class="brush:php;toolbar:false;">while (true) {
  tcp::socket socket(io);
  acceptor.accept(socket);

  // 读请求（简化：最多读 1024 字节，找首个 \r\n\r\n）
  std::vector<char> buf(1024);
  size_t len = socket.read_some(asio::buffer(buf));
  std::string req(buf.begin(), buf.begin() + len);

  // 提取请求行中的路径（粗略解析）
  std::string path = "/";
  size_t get_pos = req.find("GET ");
  if (get_pos != std::string::npos) {
    size_t start = get_pos + 4;
    size_t end = req.find(' ', start);
    if (end != std::string::npos && end > start) {
      path = req.substr(start, end - start);
    }
  }

  // 构造响应
  std::string body = make_http_response(path);
  std::ostringstream resp;
  resp << "HTTP/1.1 200 OK\r\n"
          << "Content-Type: text/plain; charset=utf-8\r\n"
          << "Content-Length: " << body.size() << "\r\n"
          << "\r\n"
          << body;

  // 发送响应
  asio::write(socket, asio::buffer(resp.str()));
}

g++ -std=c++17 -I/path/to/asio/server.cpp -o httpd