admin/docs/core-modules/fallback-screens/backend.md

Fallback Screens Backend

Fallback Screens is currently a frontend-only core module.

There is no backend source folder for this module.

Backend Relationship

Backend modules may return HTTP status codes or API error payloads that eventually lead the admin frontend to show a fallback screen, but the fallback UI is owned by:

apps/admin/src/core/FallbackScreens/

Examples:

Status	Frontend fallback	Notes
403	/error/403 or inline	Used for permission denied states.
404	/error/404	Used for unknown frontend routes.
500	/error/500	Used for generic server failure presentation.

When Backend Changes Are Needed

Backend changes are only needed when:

• A backend endpoint should return a different status code.
• A redirect or auth flow should navigate the frontend to a fallback route.
• A feature needs a new machine-readable error contract that the frontend can map to a fallback screen.