C++ Asio connect to wss - c++

Question

I am trying to connect to a secure websocket using asio.
This example will work for an ip address:
#include <iostream>
#include <asio.hpp>
int main() {
asio::error_code ec;
asio::io_context context;
asio::io_context::work idleWork(context);
asio::ip::tcp::endpoint endpoint(asio::ip::make_address("51.38.81.49", ec), 80);
asio::ip::tcp::socket socket(context);
socket.connect(endpoint, ec);
if (!ec) {
std::cout << "Connected!" << std::endl;
} else {
std::cout << "Failed to connect to address: \n" << ec.message() << std::endl;
}
return 0;
}
but how would I change it so I connect to "wss://api2.example.com"?
EDIT:
Thanks for your answer karastojko - it seems to get me some of the way. I would though like to know if I am actually connected to the server, so I have updated my example with your input, added a working WSS which I know will answer and created read and write.
#include <asio.hpp>
#include <asio/ts/buffer.hpp>
std::vector<char> vBuffer(1 * 1024);
// This should output the received data
void GrabSomeData(asio::ip::tcp::socket& socket) {
socket.async_read_some(asio::buffer(vBuffer.data(), vBuffer.size()),
[&](std::error_code ec, std::size_t lenght) {
if (!ec) {
std::cout << "\n\nRead " << lenght << " bytes\n\n";
for (int i = 0; i < lenght; i++)
std::cout << vBuffer[i];
GrabSomeData(socket);
}
}
);
}
int main() {
asio::error_code ec;
asio::io_context context;
asio::io_context::work idleWork(context);
std::thread thrContext = std::thread([&]() { context.run(); });
// I hope this is what you meant
asio::ip::tcp::resolver res(context);
asio::ip::tcp::socket socket(context);
asio::connect(socket, res.resolve("echo.websocket.org", std::to_string(443)));
// Check the socket is open
if (socket.is_open()) {
// Start to output incoming data
GrabSomeData(socket);
// Send data to the websocket, which should be sent back
std::string sRequest = "Echo";
socket.write_some(asio::buffer(sRequest.data(), sRequest.size()), ec);
// Wait some time, so the data is received
using namespace std::chrono_literals;
std::this_thread::sleep_for(20000ms);
context.stop();
if (thrContext.joinable()) thrContext.join();
}
return 0;
}

Answer 1

For that purpose use the resolver class:
tcp::resolver res(context);
asio::ip::tcp::socket socket(context);
boost::asio::connect(socket, res.resolve("api2.example.com", 80));