path/to/venv/lib/python3.10/site-packages/fastapi/security/utils.py

from typing import Optional, Tuple


def get_authorization_scheme_param(
    authorization_header_value: Optional[str],
) -> Tuple[str, str]:
    if not authorization_header_value:
        return "", ""
    scheme, _, param = authorization_header_value.partition(" ")
    return scheme, param