firebase (fcm) says 401 unauthorized

Question

private void sendMsg() {
    DBManager dbManager = DBManager.getInstance();
    ArrayList<String> firebaseIds;

    try {
        ResultSet rs= dbManager.getRegisteredFirebaseDevice();
        while(rs.next()){
            System.out.println(rs.getString(1));
            firebaseIds.add(rs.getString(1));
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }

    String url = "https://fcm.googleapis.com/fcm/send";
    URL obj = new URL(url);
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();

    // add reuqest header
    con.setRequestMethod("POST");
    con.setRequestProperty("Authorization: key", "AIzaSyAl6S936qt_NKKFwwbd-NEmiSGIL7G_yJc");
    con.setRequestProperty("Content-Type", "application/json");
    // String msg="New design added in "+getCategory(designCategory)+". Design no."+designNo;
    // String urlParameters = "data.msg="+msg+"&registration_id="+firebaseIds.get(0);

    JSONObject msg=new JSONObject();
    msg.put("msg","New design added in "+getCategory(designCategory)+". Design no."+designNo);


    JSONObject parent=new JSONObject();

    parent.put("to", firebaseIds.get(0));
    parent.put("data", msg);

    // String urlParameters = "registration_id="+firebaseIds.get(0);
    // Send post request
    con.setDoOutput(true);


    OutputStreamWriter wr= new OutputStreamWriter(con.getOutputStream());
    wr.write(parent.toString());

    // DataOutputStream wr = new DataOutputStream(con.getOutputStream());
    // wr.writeBytes(urlParameters);
    // wr.flush();
    // wr.close();

    int responseCode = con.getResponseCode();
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + parent.toString());
    System.out.println("Response Code : " + responseCode+" "+con.getResponseMessage());

}

When I call the above code, it gives me response as 401 Unauthorized. I am not able to understand why I am getting this error. I have used proper server key. Is there any syntax error or anything wrong in the strategy used by me.

I have followed the https://firebase.google.com/docs/cloud-messaging/server#implementing-http-connection-server-protocol documentation

score 12 · Answer 1 · answered Jun 24 '16 at 12:29

Just Solved the problem for me, I changed the Server API Key, which is given on the Cloud messaging tab, in FCM Console. In Project Overview, Manage, there is the Cloud Messaging tab, it shows a SERVER API KEY use that may be. In json file client_api key and SERVER_API_KEY different!!

score 9 · Accepted Answer · answered Jun 23 '16 at 16:56

9

Try replacing:

con.setRequestProperty("Authorization: key", "<YOUR API KEY>");

with:

con.setRequestProperty("Authorization", "key=<YOUR API KEY>");

answered Jun 23 '16 at 16:56

Arthur Thompson

9,087
4
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score 3 · Answer 3 · answered Jun 28 '17 at 12:57

3

Based on Harco's answer, in the Firebase console look at "Project settings" (click on gear icon) and choose the "Cloud Messaging" tab. "Server key" is what you need.

Actual on 2017.06.28.

answered Jun 28 '17 at 12:57

DmitryKanunnikoff

2,226
2
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Using the server key, still Unauthorized – UndercoverCoder Feb 19 '20 at 01:42
1

@UndercoverCoder I am sorry for the long silence. Using of server key is deprecated now. We need to use a service account: https://firebase.google.com/docs/cloud-messaging/migrate-v1?hl=en#java – DmitryKanunnikoff Aug 14 '20 at 07:58
1

- I ended up resolving the problem, but thank you :) – UndercoverCoder Aug 14 '20 at 19:20

score -1 · Answer 4 · answered May 22 '17 at 09:31

-1

https://firebase.google.com/docs/cloud-messaging/server

"Make sure this is the server key, whose value is available in the Cloud Messaging tab of the Firebase console Settings pane. Android, iOS, and browser keys are rejected by FCM."

answered May 22 '17 at 09:31

Michal Gumny

1,770
1
16
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firebase (fcm) says 401 unauthorized

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