C++ RSDK Casablanca listener with extern uri

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C++

webservice

VS2012

I find this useful code that wait on port and send request, but the problem is cause it want work for external addresses (like www.google.com), now my question is how to make listener to listen for external addresses in casablanca?

http_listener listenerVoices(L"http://localhost:8080/hello");
// http_listener listenerVoices(L"https://www.google.com/"); this don't work
listenerVoices.open().wait();

listenerVoices.support(web::http::methods::GET, [](web::http::http_request request)
{
    request.reply(web::http::status_codes::OK, L"Hello world");
}
);

std::string line;
std::cout << "Press enter to exit" << std::endl;
std::getline(std::cin, line);

listenerVoices.close().wait();