Firebase 401 unauthorized error FCM

Question

I\'m trying to test out Firebase Cloud messaging APIs as all functionality is not available from console (notably customization of notifications when app is in background).

Answer 1

I noticed from your screenshot that you were using "key: serverKey". Could you try using "key=serverKey" instead?

Also you don't need to have "POST fcm.googleapus.com/fcm/send"; this is not proper json and would explain the error you are seeing. The URL of the request is already defined elsewhere so remove it from the payload.