#include <iostream>
#include <Poco/Net/HTTPSClientSession.h>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/StreamCopier.h>
#include <Poco/Net/SSLManager.h>

int main()
{
    Poco::Net::Context::Ptr context
        = new Poco::Net::Context(Poco::Net::Context::TLS_CLIENT_USE, "");

    Poco::Net::initializeSSL();
    Poco::Net::SSLManager::instance().initializeClient(nullptr, nullptr, context);

    try {
        static const std::string host = "status.github.com";
        Poco::Net::HTTPSClientSession session(host, 443);
        Poco::Net::HTTPRequest req(Poco::Net::HTTPRequest::HTTP_GET, "/");
        session.sendRequest(req);
        Poco::Net::HTTPResponse res;
        std::istream& rs = session.receiveResponse(res);
        std::cout << res.getStatus() << " " << res.getReason() << "\n";
        Poco::StreamCopier::copyStream(rs, std::cout);
    }
    catch (const Poco::Exception& ex)
    {
        std::cerr << ex.displayText() << "\n";
    }

    return EXIT_SUCCESS;
}

Invalid certficate: Host name verification failed