Unpredictable URLs with Firebase Cloud Functions 2nd gen

Question

I am used to Firebase Functions and now trying to set up a project with Firebase Cloud Functions 2nd Gen.

When I deploy my functions they do not get the predictable URLs that I know from 1st gen (like: https://europe-west1-[project-slug].cloudfunctions.net/[function-name]), but rather some weird URLs like this one: https://[function-name]-kbnn7zbc7q-uc.a.run.app).

I can't find any mentions of this in the documentation and I expect there may be a setting to get a more predictable scheme for functions URLs?

Answer 1

As of now at least, there is also a deterministic URL for functions.

The tutorial adds this:

Both 1st gen and 2nd gen functions have assigned URLs that have the following format. These URLs have a deterministic format, meaning that you can predict what the URL will be before you deploy the function:

https://REGION-PROJECT_ID.cloudfunctions.net/FUNCTION_NAME

Firebase (unhelpfully) shows the non-deterministic URL. You can see the deterministic URL in the GCP console for functions if you are like me and don't completely trust the URL pattern above.

Answer 2

There is currently no such option. Cloud Functions 2nd gen is actually built on top of another cloud service called Cloud Run. The URL you're seeing is a Cloud Run URL (note run.app).

There are mentions in GCP Cloud Functions doc about this URL. In particular, in this tutorial, it says:

Note: Currently, function URLs in Cloud Functions (2nd gen) use a non-deterministic format, meaning you cannot predict your function URL before deployment, though the URL remains stable after deployment. In a future release, function URLs will be updated to be both stable and deterministic.

Also in gcloud docs:

Note: Currently, function URLs in Cloud Functions (2nd gen) use a non-deterministic format, meaning you cannot predict your function URL before deployment, though the URL remains stable after deployment. In a future release, function URLs will be updated to be both stable and deterministic.

Firebase just uses the underlying GCP products, so it inherits the same properties of the generated URL.