What exactly mean “No Outbound Networking” in free tier on Cloud Functions for Firebase?

Question

In Google Firebase pricing (https://firebase.google.com/pricing/) table states:

The Spark plan only allows outbound network requests to Google-owned

Answer 1

no, they do not talk about JavaScript Functions, they talk about serverless computing functions

https://firebase.google.com/features/functions/

theses functions can make only make http calls to Google Services and e.g. not to Yahoo or Amazon services

Answer 2

At lowest possible costs (USD 11.53) it is better to have Blaze plan and use REST calls to Firebase functions freely:

Answer 3

firebaser here

Good catch, that piece of documentation probably should be clarified.

Inbound requests are allowed, as long as you're within your allowed quota. So your app can call a Cloud Function.

Outbound requests for projects on the free plan are only allowed to Google-owned services. So your Cloud Function code can only call google owned web APIs, unless it's on a paid plan.

Update: the above applies up to Node.js runtimes up to v8. From Node.js 10 and upwards your Firebase project needs to be on a paid plan to be able to use Cloud Functions. For full details on this, see the Firebase FAQ on Cloud Functions pricing.