Google FCM Server: 200 but no notification sent to phone

Question

I am working via Postman to send a FCM push notification to my phone that already has the app installed. I have push notifications enabled, the app is on the background, and I have a valid (confirmed) Firebase push token.

I'm POSTing to https://fcm.googleapis.com/fcm/send with the headers (Authorization: key=APP_SERVER_KEY, Content-Type: application/json), and my body looks like:

{ "notification": {
"title": "Portugal vs. Denmark",
"text": "5 to 1"
},
 "to": MY_PUSH_TOKEN
}

I'm getting the following 200 OK response with body:

{
 "multicast_id": MULTICAST_ID,
 "success": 1,
 "failure": 0,
 "canonical_ids": 0,
 "results": [{
  "message_id": "0:MESSAGE_ID"
 }]
}

everything looks fine, but I'm not getting a notification on my phone? How can I troubleshoot this, does anyone know what I'm missing?

Answer 1

Found the solution!

But before I offer the solution, here is a bit more background on the situation for others who might find themselves in a similar problem. I was able to POST and send a notification to an Android device, and I was able to send a push via the Firebase console to both Android and iOS device, so the only thing didn't work was sending the push to specifically an iOS device via a POST HTTP request (quite baffling).

I found this discussion here: https://github.com/firebase/quickstart-ios/issues/21. Basically for iOS, I was missing two othere parameters in the request body. I needed to set content_available to true, and priority to high.

so it looked like this:

{
    "notification": {
        "title": "Portugal vs. Denmark",
        "body": "5 to 1"
    },
    "content_available": true,
    "priority": "high",
    "to": MY_PUSH_TOKEN
}

I believe the github discussion said something about how those added request body parameters allows FCM to push via APNS for iOS.