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downloadHandler give empty on Hololens

Hi! I'm new to hololens and mixed reality application.
Now, I'm struggling at getting downloadHandler.text
I used UnityWebRequest, and put/get "string data" to the firebase.
On Unity, my code works well.
On real device(Hololens), I can put data on firebase, but I cannot get data from firebase.
The data are always empty, not null.

public class : MonoBehaviour, IInputClickHandler
string fb_url = "https://xxxxxxxxxxxxx.firebaseio.com/googlehome/word.json";
// AirTap
public void OnInputClicked(InputClickedEventData eventData)
StartCoroutine(Put(fb_url, "\"tv on\""));
public IEnumerator Put(string url, string jsonStr)

    var request = new UnityWebRequest();
    request.url = url;
    byte[] body = Encoding.UTF8.GetBytes(jsonStr);
    request.uploadHandler = new UploadHandlerRaw(body);
    request.downloadHandler = new DownloadHandlerBuffer();
    request.SetRequestHeader("Content-Type", "application/json; charset=UTF-8");
    request.method = UnityWebRequest.kHttpVerbPUT;
    yield return request.Send();

    if (request.isNetworkError)
        if (request.responseCode == 200)
            Debug.Log(request.downloadHandler.text); // empty...



Please advice me!

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