X509v3 Extended Key Usage:
                TLS Web Server Authentication
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Subject Alternative Name:
                DNS:longOID.example
            X509v3 Certificate Policies:
                Policy: 1.3.6.1.4.1.311.21.8.1492336001

    Signature Algorithm: sha256WithRSAEncryption

        `on_event` is deprecated, use `lifespan` event handlers instead.

        Read more about it in the
        [FastAPI docs for Lifespan Events](https://fastapi.tiangolo.com/advanced/events/#alternative-events-deprecated).
        """

        def decorator(func: DecoratedCallable) -> DecoratedCallable:
            self.add_event_handler(event_type, func)
            return func