C++ REST SDK 接続確認のpingでjsonをかえすときのresponseの確認

pplx::task<void> RequestJSONValueAsync()
{
    // TODO: To successfully use this example, you must perform the request 
    // against a server that provides JSON data. 
    // This example fails because the returned Content-Type is text/html and not application/json.
    http_client client(L"http://133.34.174.246:5000/ping");
    return client.request(methods::GET).then([](http_response response) -> pplx::task<json::value>
    {
        if (response.status_code() == status_codes::OK)
        {
            return response.extract_json();
        }

        // Handle error cases, for now return empty json value...
        return pplx::task_from_result(json::value());
    })
        .then([](pplx::task<json::value> previousTask)
    {
        try
        {
            const json::value& v = previousTask.get();
            // Perform actions here to process the JSON value...
            wcout << v << endl;
        }
        catch (const http_exception& e)
        {
            // Print error.
            wostringstream ss;
            ss << e.what() << endl;
            wcout << ss.str();
        }
    });

    /* Output:
   Content-Type must be application/json to extract (is: text/html)
   */
}


int wmain()
{
    /*std::wcout << L"Calling HTTPStreamingAsync..." << std::endl;
   HTTPStreamingAsync().wait();*/
    
    wcout << L"Calling RequestJSONValueAsync..." << endl;
    RequestJSONValueAsync().wait();

    getchar();
}

responseがvで帰ってくる