std::string host = "example.com";
unsigned int port_num = 80;
asio::ip::tcp::resolver::query resolver_query(host,
  port_num, asio::ip::tcp::resolver::query::numeric_service);
 asio::ip::tcp::resolver resolver(ios);
 boost::system::error_code ec;
 asio::ip::tcp::resolver::iterator it =
  resolver.resolve(resolver_query, ec);

URL URL::Parse(const char * url) {
std::regex r("^"
    "("             // 1. server = protocol user:password @ host : port
    "("             // 2. protocol = scheme + ://
    "([^:]+)"       // 3. scheme
    "://"           // 
    ")"
    "("             // 4. user:password 
    "([^:@]+)?"     // 5. user
    "(:([^@]*))?"   // 6. :password 7. password
    "@)?"
    "([^:/$]+)?"    // 8. host
    "(:(\\d+))?"    // 9. :port 10. port
    ")"
    "(/[^$]*)?"     // 11. path
    "$"
  );
  std::cmatch m;
  bool matched = std::regex_match(url, m, r);

std::string Requests::Get(const std::string& url)
{
  boost::asio::io_context ioContext;
  boost::asio::ip::tcp::resolver resolver(ioContext);
  boost::asio::ip::tcp::resolver::query query(url, "80",
                                                boost::asio::ip::tcp::resolver::query::numeric_service);
  const auto resolved = resolver.resolve(query);
  boost::beast::tcp_stream tcpStream(ioContext);
  tcpStream.connect(resolved);

  boost::beast::http::request<boost::beast::http::string_body> request{ boost::beast::http::verb::get,
      url, 11 };
  request.set(boost::beast::http::field::host, url);
  request.set(boost::beast::http::field::user_agent, "Agent");
  boost::beast::http::write(tcpStream, request);
  boost::beast::flat_buffer buffer;
  boost::beast::http::response<boost::beast::http::dynamic_body> response;

  boost::beast::http::read(tcpStream, buffer, response);
  const std::string answer = boost::beast::buffers_to_string(buffer.data());

  tcpStream.socket().shutdown(boost::asio::ip::tcp::socket::shutdown_both);
  return answer;
}