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git.stella-ops.org/docs/features/unchecked/concelier/concelier-deprecation-headers-middleware.md

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# Concelier Deprecation Headers Middleware
## Module
Concelier
## Status
IMPLEMENTED
## Description
HTTP deprecation headers middleware for Concelier API endpoints, signaling API version lifecycle to consumers. Not in the known list.
## Implementation Details
- **Modules**: `src/Concelier/StellaOps.Concelier.WebService/Deprecation/`
- **Key Classes**:
- `DeprecationMiddleware` (`src/Concelier/StellaOps.Concelier.WebService/Deprecation/DeprecationMiddleware.cs`) - ASP.NET Core middleware that adds HTTP deprecation headers to responses
- `DeprecationMiddlewareExtensions` (`src/Concelier/StellaOps.Concelier.WebService/Deprecation/DeprecationMiddleware.cs`) - extension methods for middleware registration
- `DeprecationMiddlewareRegistration` (`src/Concelier/StellaOps.Concelier.WebService/Deprecation/DeprecationMiddleware.cs`) - DI registration helpers
- **Source**: Sprint 0116 (batch_14/file_17.md)
## E2E Test Plan
- [ ] Call a deprecated API endpoint and verify the response includes `Deprecation` and `Sunset` HTTP headers
- [ ] Call a non-deprecated endpoint and verify no deprecation headers are present
- [ ] Verify the deprecation date format conforms to RFC 7231
- [ ] Verify middleware registration: confirm `DeprecationMiddleware` is in the ASP.NET Core pipeline