Function parse_upgrade_protocol

src/websockets/headers.py:268–283

Parse an Upgrade protocol from ``header`` at the given position. Return the protocol value and the new position. Raises: InvalidHeaderFormat: On invalid inputs.

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

def parse_upgrade_protocol(
    header: str, pos: int, header_name: str
) -> tuple[UpgradeProtocol, int]:
    """
    Parse an Upgrade protocol from ``header`` at the given position.

    Return the protocol value and the new position.

    Raises:
        InvalidHeaderFormat: On invalid inputs.

    """
    match = _protocol_re.match(header, pos)
    if match is None:
        raise InvalidHeaderFormat(header_name, "expected protocol", header, pos)
    return cast(UpgradeProtocol, match.group()), match.end()


def parse_upgrade(header: str) -> list[UpgradeProtocol]: