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git.stella-ops.org/docs/features/checked/concelier/concelier-deprecation-headers-middleware.md
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Concelier Deprecation Headers Middleware

Module

Concelier

Status

VERIFIED

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

Verification

  • Run ID: run-001
  • Date: 2026-02-13
  • Result: PASS - WebService.Tests 215/215 passed. 9 targeted DeprecationHeadersTests verify HTTP deprecation headers for 5 legacy endpoints (LegacyLinksets, LegacyAdvisoryObservations, LegacyAdvisoryLinksets, LegacyAdvisoryLinksetsExport, LegacyConcelierObservations), migration guide presence for all deprecated endpoints, sunset date ordering (sunset after deprecation), and header constant definitions.