Does Front Door origins support wildcard hosts?

Question

I have an AKS cluster behind a Front Door, connected through a private link that is pointing to an internal load balancer. The cluster hosts multiple applications that are accessible through dynamically created subdomains.

My setup is as follows:

1. My DNS forwards all requests to *.example.com to Front Door
2. A route sends all requests for *.example.com to the cluster origin
3. The cluster origin host name is set to example.com (with PLS enabled)

I am struggling to find out in 3. if its possible to use a wildcard host (*.example.com). This would essentially route requests for *.example.com to a single host. The requests would then be resolved by my ingress controller (so the original host name must be preserved up to this point), using the subdomain to route the request to the correct application.

Is this possible?

Answer 1

Hi John,

Thank you for reaching out to us on the Microsoft Q&A forum.

As an original poster cannot accept their own answer, I am reposting it so that you can accept it an answer. Accepted answer will help other community members navigate to the appropriate solutions.

Issue: Does Front Door origins support wildcard hosts?

Solution: Setting a dummy subdomain in the origin host forwards the original host in the request to the origin. What I wanted was to set the origin host name to something like *.example.com, which is not possible, but x.example.com (or any string before .example) works. I also set the origin host header to blank.

Answer 2

I believe I have solved this.

Setting a dummy subdomain in the origin host forwards the original host in the request to the origin. What i wanted was to set the origin host name to something like *.example.com, which is not possible, but x.example.com (or any string before .example) works. I also set the origin host header to blank.