Function build_subprotocol

src/websockets/headers.py:458–465

Build a ``Sec-WebSocket-Protocol`` header. This is the reverse of :func:`parse_subprotocol`.

(subprotocols: Sequence[Subprotocol])

def build_subprotocol(subprotocols: Sequence[Subprotocol]) -> str:
    """
    Build a ``Sec-WebSocket-Protocol`` header.

    This is the reverse of :func:`parse_subprotocol`.

    """
    return ", ".join(subprotocols)


build_subprotocol_list = build_subprotocol  # alias for backwards compatibility