def default_retry_on(exc: Exception) -> bool:
    import httpx
    import requests

    if isinstance(exc, ConnectionError):
        return True
    if isinstance(exc, httpx.HTTPStatusError):
        return 500 <= exc.response.status_code < 600
    if isinstance(exc, requests.HTTPError):
        return 500 <= exc.response.status_code < 600 if exc.response else True
    if isinstance(
        exc,
        (
            ValueError,
            TypeError,
            ArithmeticError,
            ImportError,
            LookupError,
            NameError,
            SyntaxError,
            RuntimeError,
            ReferenceError,
            StopIteration,
            StopAsyncIteration,
            OSError,
        ),
    ):
        return False
    return True