fetch the public IP addresses of your n8n instance

Description

Why
If you need to use n8n to connect to service providers of yours, some of which happen to rely on firewall white-listing as part of their access control, you'll need to determine or verify the public IP addresses of your n8n instance(s).

How does it work
The webhook, upon invocation, will use Http Request node to request public IP address information from ++api.ipify.org++ in json format, for 10 times, then aggregate results to an array.
The reason to repeat, is to get all the potential public IP addresses of your n8n instance.
Often than not, enterprises or network providers deploy at least a pair of gateway devices at the border for redundancy.
built-in array functions in a javascript expression are used to pluck all the values under 'ip' key, and to dedup to an array as response body.

How to set it up
import the workflow
set up your own header-auth credential
update the workflow to use the new credential
test or activate workflow as usual.

example invocation
$ curl -H "api-key: super-long-api-token" http://localhost:5678/webhook-test/4879bc79-d6f8-48df-bfe4-613366c7f399
["88.88.88.66", "88.88.88.88"]