With this preview, GitHub Enterprise Cloud accounts with Enterprise Managed Users (EMU) can decide to allow EMU enterprise traffic to github.com only via their existing corporate proxies. Unapproved traffic would be blocked. With enterprise access restrictions via corporate proxies, you can now configure your network proxy or firewall to inject a header into your users’ web and API requests to github.com. This signal tells GitHub to block the request if it is from a user outside of your EMU ente...