Can I specify an absolute URL as installation callback?

The base URL of my Atlassian Connect app is the HTTP server responsible for serving the static UI only. I would like to receive the lifecycle callbacks directly to my backend service, though, so I can reliably respond with a 200 code without having to forward anything from my frontend.

The docs state that:

Each property in this object is a URL relative to the app’s base URL.

Is there a way to do it?

Not what you’re wanting to do. Connect requires you to serve everything off from the same base url.

Thanks for the quick reply. To all the following readers: I have solved the problem by deploying an nginx API gateway in front of both front- and backend, which then routes the requests by Jira accordingly.