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Custom domains and HTTPS

What it's for

Serve your app on your own domain instead of the platform's default, with a TLS certificate issued and renewed automatically.

This is a two-step model:

  1. Authorize an apex domain you own (project-level, on the Domains page).
  2. Attach a hostname under that apex to a specific app (per-app, in that app's Settings → Domains tab).

Step 1 — Authorize your apex domain

  1. Go to Domains (project-level nav) → Add Domain.
  2. Enter the apex (root) domain you own, e.g. acme.com — no http://, no subdomain, no path.
  3. You'll get a TXT record challenge: a Type, Host/Name, and Value to add at your DNS provider. Each has a copy button.
  4. Add the record at your DNS provider, then come back and click Verify.
  5. Verification is manual — there's no auto-polling. If your DNS hasn't propagated yet, just click Verify again in a few minutes.
  6. Once verified, the apex and all its subdomains are authorized for this project.

Step 2 — Attach a hostname to an app

  1. Open the app you want to expose → Settings → Domains tab.
  2. Enter the hostname, e.g. shop.acme.com (must be the apex itself or a subdomain of an already-verified apex for this project).
  3. Click Attach. You'll get a DNS hint (record type/host/target) to point at the platform ingress if you haven't already.
  4. The TLS certificate is issued automatically once DNS resolves to the platform.
  5. The hostname appears in a table with Status and Certificate columns so you can see when it's live.

Gotchas

  • Attach happens on the app, not on the Domains page. The Domains page only handles apex-level ownership verification — you won't find a "attach subdomain" control there. This matches the inventory's "split-brain" observation; it hasn't been unified yet.
  • Verify is manual, no auto-poll — expect to click it once, wait for DNS propagation ("can take a few minutes"), and click it again.
  • Removing a domain authorization requires detaching every hostname under it first — the confirm dialog says so explicitly. Detach hostnames in each app's Settings → Domains tab before trying to remove the apex.
  • Detaching a hostname removes its TLS certificate and ingress immediately (the app itself keeps running on the platform's default URL).

Not yet supported

  • Auto-polling verification (you must click Verify yourself).
  • Attaching/managing hostnames from the Domains page itself — it's app-settings-only today.
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