simple c++ web server with multi-threading, async i/o and keep-alives.

www.cpp

#include <boost/beast.hpp>
#include <boost/asio.hpp>
namespace ip = boost::asio::ip;
namespace http = boost::beast::http;
int main() {
  boost::asio::thread_pool ioc;
  ip::tcp::acceptor acceptor{ioc, ip::tcp::endpoint{ip::address::from_string("127.0.0.1"), 9999}};
  while(true) {
    ip::tcp::socket socket{ioc};
    acceptor.accept(socket);
    co_spawn(ioc, [socket = std::move(socket)]() mutable -> boost::asio::awaitable<void> {
      for (bool keep_alive = true; keep_alive; ) {
        http::request<http::string_body> req;
        boost::beast::flat_buffer buffer;
        co_await http::async_read(socket, buffer, req, boost::asio::use_awaitable);
        keep_alive = req.keep_alive();
        auto path = "htdir" + std::string{req.target()};
        if (req.target().ends_with("/")) path += "index.html";
        boost::beast::error_code ec;
        http::response<http::file_body> resp;
        resp.body().open(path.c_str(), boost::beast::file_mode::scan, ec);
        if (resp.body().is_open()) {
          resp.keep_alive(keep_alive);
          resp.prepare_payload();
          co_await http::async_write(socket, resp, boost::asio::use_awaitable);
        }
      }
    }, boost::asio::detached);
  }
}