Firebase:来自 Android 应用程序 returns 的 HTTP POSTing 通知成功但没有任何反应

Firebase: HTTP POSTing Notification from Android App returns success but nothing happens

我正在尝试 post 直接从我的应用程序而不是使用 Firebase 控制台发送通知。 我写的代码是这样的:

    URL url= null;
    HttpURLConnection client = null;
    try{
        url = new URL("https://fcm.googleapis.com/fcm/send");
        client = (HttpURLConnection) url.openConnection();
        client.setDoOutput(true);

        client.setRequestMethod("POST");
        client.setRequestProperty("Content-Type", "application/json");
        client.setRequestProperty("Accept", "application/json");
        client.setRequestProperty("Authorization", "key=<here my server key from firebase site");
        client.setRequestProperty("project_id", "<here my sender ID from firebase site");
        client.connect();


        JSONObject payload = new JSONObject();
        payload.put("body",news.text);
        payload.put("title",news.title);


        JSONObject notif = new JSONObject();
        notif.put("to", "/topics/MyFirstTopic");
        notif.put("notification", payload);

        OutputStream outputPost = client.getOutputStream();
        outputPost.write(notif.toString().getBytes("UTF-8"));
        outputPost.flush();
        outputPost.close();

        // Read the response into a string
        InputStream is = client.getInputStream();
        String responseString = new Scanner(is, "UTF-8").useDelimiter("\A").next();
        is.close();

    }
    catch(Exception e) {
        if (e.getMessage() != null) {
            Log.e("SEND NOTIF TO FB", e.getMessage());
        }
        else {
            Log.e("SEND NOTIF TO FB", e.toString());
        }
    }
    finally {
        if(client!=null) client.disconnect();
    }

代码运行没有错误并且响应(在 responseString 中)显然是正确的:

{
  "message_id": "123456789..."
}

但是在 Firebase 控制台中(在通知页面中)我看不到 posted 通知,两个设备都没有收到它。

我错过了什么??

注意:为了简洁起见,我没有post这里的权限设置和威胁通知代码(onMessageReceive...),但我可以保证它适用于从 Firebase 控制台发送的通知。

Firebase 通知控制台仅显示从控制台本身发送的消息。它不显示您通过 Firebase Cloud Messaging API.

发送的消息