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bugfix: subrouter custom methodNotAllowed handler returning 404 ( 509) ( 510)

bugfix: subrouter custom methodNotAllowed handler returning 404 ( 509) ( 510): a task in repo2rlenv-commit-runtime-test: repo2rlenv-commit-runtime (Harbor dataset). Title: bugfix: subrouter custom methodNotAllowed handler returning 404

The task

**Title:** bugfix: subrouter custom methodNotAllowed handler returning 404

Part of AdithyaSK/repo2rlenv-commit-runtime-test.