Which URL`s are needed for Xtracta to go through a firewall?

Xtracta requires some URL`s to be allowed to go through internal firewalls.

• web1-akl.xtracta.com (PDFs)
• app.xtracta.com (UI)
• api-app.xtracta.com (API)
• api-app-ui.xtracta.com (UI if opened through API)