"This browser doesn't support WebAuthn API" when accessing from VM host

[tashian]

I'm running this app inside a VM.
When I access it via localhost from inside the VM, it works fine.
When I access it from the host, using the VM's DNS name or IP, I get the "This browser doesn't support WebAuthn API" error, no matter which browser I use.

• I've given my VM a DNS name, and I've set WEBAUTHN_ORIGIN=http:https://vm.dns.name:3000.
• I've also set config.hosts << "vm.dns.name:3000"
• I'm running with development rails env, and I'm binding to 0.0.0.0.

[tashian]

Ah. WebAuthn requires either localhost or https. I needed to set up a server certificate.