New model routing gateways might use a gateway.dev default hostname

If you create a gateway that uses model routing on or after September 3, 2026, it might receive a gateway.dev default hostname instead of a run.app one, in the form https://GATEWAY_ID-PROJECT_NUMBER.REGION.gateway.dev — for example, https://my-gateway-123456789012.us-central1.gateway.dev. This is a second gateway.dev format; other gateways keep the existing one.

To get a gateway's URL, read its defaultHostname property.