App Platform: Internal communication between a service and a function

I’m using App Platform and have got the following components setup in it:

• Web Service (called library)
• 4 Functions

The Web Service is a simple NodeJS application with a few endpoints in it. I’ve setup App Platform so that the Web Service uses internal ports only, meaning it cannot be accessed from the internet. All of my Functions are exposed to the public internet however and I am able to use Postman to call them.

I’d like to have my Functions call endpoints in my Web Service. Reading the documentation it appears that this should be possible if components belong to the same App Platform, however when my Function attempt to call any Web Service endpoint (example: http://library:{port}/get-books) it returns Error: getaddrinfo ENOTFOUND library, implying it cannot reach the endpoints in the Web Service.

Is my approach to call endpoints in the Web Service correct? Or have I misinterpreted the documentation and Functions are not included as components that are able to use the private network?

Documentation referenced:

• https://docs.digitalocean.com/products/app-platform/how-to/manage-internal-routing/
• https://www.digitalocean.com/community/questions/app-platform-component-to-component-requests