Отправка xml запросов на сервер с использованием ssl сертификатов

#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/asio/ssl/context.hpp>
 
using boost::asio::ip::tcp;
namespace ssl = boost::asio::ssl;
typedef ssl::stream<tcp::socket> ssl_socket;
 
ssl::context ctx(ssl::context::sslv3);

#include <iostream>
#include <vector>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
 
int main()
{
    using boost::asio::ip::tcp;
    namespace ssl = boost::asio::ssl;
    typedef ssl::stream<tcp::socket> ssl_socket;
 
    // Create a context that uses the default paths for finding CA certificates.
    ssl::context ctx(ssl::context::sslv23);
    ctx.set_default_verify_paths();
 
    // Open a socket and connect it to the remote host.
    boost::asio::io_service io_service;
    ssl_socket sock(io_service, ctx);
    tcp::resolver resolver(io_service);
    tcp::resolver::query query("vk.com", "https");
    boost::asio::connect(sock.lowest_layer(), resolver.resolve(query));
    sock.lowest_layer().set_option(tcp::no_delay(true));
 
    // Perform SSL handshake and verify the remote host's certificate.
    sock.set_verify_mode(ssl::verify_peer);
    sock.set_verify_callback(ssl::rfc2818_verification("vk.com"));
    sock.handshake(ssl_socket::client);
 
 
     
#define HANDL(ec)   if (ec){ std::cerr << ec.message() << std::endl; exit(1); }
    
 
        boost::system::error_code ec;
        boost::asio::streambuf ss;
 
        HANDL(ec);
 
        std::ostream os(&ss);
        os << "GET / HTTP/1.1\r\n"
            << "Client: boost-asio some\r\n"
            << "Accept: deflate\r\n"
        << "Connection: keep-alive\r\n"
        << "Host: vk.com\r\n"
        << "User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/34.0.1847.116 Chrome/34.0.1847.116 Safari/537.36\r\n"
            << "\r\n";
 
        sock.write_some(ss.data(), ec);
        HANDL(ec);
 
        ss.consume(ss.size());
 
        boost::asio::read_until(sock, ss, "\r\n\r\n");
 
        const char* s = boost::asio::buffer_cast<const char*>(ss.data());
        std::cerr << s << std::endl;
}