OPENAPI_CORS_ALLOW_ORIGINS env var defaults to empty (same-origin only).
Operators expand for third-party integrations via comma-separated list.
Allowed headers: Authorization, Content-Type, X-CSRF-Token. Methods:
GET POST PATCH DELETE OPTIONS. Max-Age 600s. supports_credentials=True
so cookie-authed approve/deny work once Phase D moves them in.
Disallowed origins receive a normal 200 OPTIONS response without the
Access-Control-Allow-Origin header — flask-cors's standard behavior;
browser blocks the cross-origin request from the disallowed origin.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
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