Function validate_subprotocols

src/websockets/headers.py:471–482

Validate that ``subprotocols`` is suitable for :func:`build_subprotocol`.

(subprotocols: Sequence[Subprotocol])

def validate_subprotocols(subprotocols: Sequence[Subprotocol]) -> None:
    """
    Validate that ``subprotocols`` is suitable for :func:`build_subprotocol`.

    """
    if not isinstance(subprotocols, Sequence):
        raise TypeError("subprotocols must be a list")
    if isinstance(subprotocols, str):
        raise TypeError("subprotocols must be a list, not a str")
    for subprotocol in subprotocols:
        if not _token_re.fullmatch(subprotocol):
            raise ValueError(f"invalid subprotocol: {subprotocol}")


def build_www_authenticate_basic(realm: str) -> str: