How do I make a Private Space app accept requests on HTTPS?

Issue

I removed an SSL server certificate or disabled ACM for the custom domain. The app no longer accepts requests even at the default domain name, <app-name>.herokuapp.com

$ curl -I https://<app-name>.herokuapp.com/
curl: (7) Failed to connect to <app-name>.herokuapp.com port 443: Connection refused

Resolution

Please enable Automated Certificate Management:

heroku certs:auto:enable

This will trigger the platform to provision the SSL server certificate for the default domain name. In addition, if your DNS is configured properly, the SSL server certificate will also be valid for the custom domain.

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