Function parse_subprotocol_item

src/websockets/headers.py:426–439

Parse a subprotocol from ``header`` at the given position. Return the subprotocol value and the new position. Raises: InvalidHeaderFormat: On invalid inputs.

(
    header: str, pos: int, header_name: str
)

def parse_subprotocol_item(
    header: str, pos: int, header_name: str
) -> tuple[Subprotocol, int]:
    """
    Parse a subprotocol from ``header`` at the given position.

    Return the subprotocol value and the new position.

    Raises:
        InvalidHeaderFormat: On invalid inputs.

    """
    item, pos = parse_token(header, pos, header_name)
    return cast(Subprotocol, item), pos


def parse_subprotocol(header: str) -> list[Subprotocol]: