C++大婶请进！！

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社区大婶，遇到一个问题，用curl做请求的时候，有时候能得到response，有时候拿不到，就是在这行代码出错：

 curl_easy_setopt(_curl_instance, CURLOPT_URL, api_url.c_str());
  curl_easy_setopt(_curl_instance, CURLOPT_WRITEDATA, httpData.get());
  curl_easy_setopt(_curl_instance, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
  curl_easy_setopt(_curl_instance, CURLOPT_TIMEOUT, 10);

  LOG(INFO) << "checking....";
// Here may segmentation fault
  res = curl_easy_perform(_curl_instance);
  curl_easy_getinfo(_curl_instance, CURLINFO_RESPONSE_CODE, &httpCode);
  LOG(INFO) << "done.";

有大佬指点一下吗？