Callable Functions - Custom URL

[Jason Berryman]

Does anyone know of a way to set the config file so that from a web app, you can call `functions.httpsCallable` with a custom URL?

We want to route traffic through Google Cloud Load Balancing (to ensure compliance and protection with Cloud Armor).

[Sam Stern]

Hi Jason,

Yes you can do this! It's a very under-documented feature but basically you can do:

// "fn" will call https://mydomain.com/api/myFunction using the Callable Functions contract

const functions = firebase.functions("https://mydomain.com/api");
const fn = functions.httpsCallable("myFunction");

This works really well with Functions + Hosting redirects, but should also be fine to use with GCLB and Cloud Armor.

- Sam

On Wed, Jul 14, 2021 at 10:28 AM Jason Berryman <jasonpb...@gmail.com> wrote:

Does anyone know of a way to set the config file so that from a web app, you can call `functions.httpsCallable` with a custom URL?

We want to route traffic through Google Cloud Load Balancing (to ensure compliance and protection with Cloud Armor).

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