curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
curl_easy_perform(curl);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
curl_easy_perform(curl);