Update to the API Gateway runtime architecture The API Gateway runtime architecture is being updated to improve its integration
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## Change
Change
**Update to the API Gateway runtime architecture**
The API Gateway runtime architecture is being updated to improve its integration with Google Cloud Platform and its services.
This update does not affect existing API Gateway features. However, be aware of the following differences:
* Status code changes for **gRPC** API Gateways
| Error | New status code | Previous status code |
| --------------- | ----------------- | -------------------- |
| Quota exceeded | ResourceExhausted | Unavailable |
| Invalid API key | InvalidArgument | InternalError |
* For 4xx client-side quota failures, API Gateway will now reject requests (fail closed). This applies to both **gRPC** and **OpenAPI** API Gateways.
If you experience any other differences in behavior due to this update, contact [Google Cloud Customer Care](https://cloud.google.com/support-hub).
**Note**: Rollouts of this release to production instances might take up to 4 weeks to complete across all Google Cloud zones. Your instances might not be updated until the rollout is complete.