Firebase: How do you add a vanity URL to a cloud function?

Question

Was briefly mentioned here, but right now I'm at the point where I've connected my GCP project to Firebase, set up a custom domain under Firebase hosting, but on the functions page of the Firebase dashboard, there doesn't seem to be a way to set the vanity URL on a cloud function.

My firebase.json (at the root of my project) looks like :

{
    "hosting": {
        "public": "public",
        "rewrites": [
            { "source": "/helloWorld", "function": "helloWorld" },
            { "source": "/progress", "function": "progress" }
        ]
    }
}

Answer 1

To associate a vanity domain with your Cloud Functions, you need to associate them with Firebase Hosting. See the documentation on connecting the two.

Say you have a Cloud Function https://us-central1-<your-project-id>.cloudfunctions.net/bigben.

After making this connection the function will also be available on https://<your-project-id>.firebaseapp.com/bigben.

If you also connect a custom domain with Firebase Hosting, the function will also be available on https://<your-custom-domain>.com/bigben.