kalluripradeep opened a new pull request, #64418:
URL: https://github.com/apache/airflow/pull/64418

   Closes #64151. 
   
   **What changed:** 
   Reuses the persistent/global `Flask` application and `AppBuilder` context 
instantiated on startup (`get_fastapi_app()`) during the `/auth/token` 
endpoints instead of generating new AppBuilder instances per request via 
`get_application_builder()`. 
   
   **Why it matters:** 
   This prevents the FastAPI context manager from racing against concurrent 
requests and clearing the singleton's cached `security_manager` property or 
mutating it with a CLI-oriented volatile AppBuilder setup, ultimately resolving 
the 500 `AppBuilder is not initialized` exceptions.
   


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