Let's say that I have a Zimbra webmail accessible at
https://mail.example.com. I also have a web app at
https://app.example.com. On one of the app's pages I am trying to embed the webmail:
However, when I go to the app page I get the following error (Firefox):
Load denied by X-Frame-Options: https://mail.example.com/ does not permit cross-origin framing.
How can I enable cross-origin framing on Zimbra server/nginx (preferably only for app.example.com)? Or is it possible to embed webmail in some other way?