Firebase Admin SDK always returns OK when sending a push notification

[saitz.peter]

Why does the Firebase Admin SDK always return OK when sending a push notification, even if no iOS- and no Android-App has been assigned to the project? 

Firebase always returns HTTP status 200 ("OK") with a body(payload) somthing like "projects/my-project-name/messages/1234567890123456789", where the number is the message id. 

When no App is assigned to the project, I would expect HTTP status 4xx with a error message.

How to differentiate between success and failure?

[Hiranya Jayathilaka]

Admin SDK (and the underlying REST API) hands the message off to FCM for delivery. You get a 200 OK if this hand off is successful. The delivery to an app happens later in the cloud. That's out of the control of the Admin SDK/REST API. This is typical in most pubsub messaging systems. Publisher does not block/fail on the state of the subscriber.

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[saitz.peter]

An API or REST call should not return "OK" if preconditions fail (e.g. no SmartPhone app assigned to project). If Firebase always returns "OK", we have to live with that circumstance.

[Hiranya Jayathilaka]

That depends. If you're sending a message to a topic, sender should be able to send anytime regardless of if there are any subscribers on the topic or not. That level of temporal decoupling is inherent in the pubsub model. I believe you do get an error when sending to a non-existing device token.

On Fri, Aug 10, 2018 at 2:27 AM saitz.peter <peter...@bawagpsk.com> wrote:

An API or REST call should not return "OK" if preconditions fail (e.g. no SmartPhone app assigned to project). If Firebase always returns "OK", we have to live with that circumstance.

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