Function build_extension

src/websockets/headers.py:411–420

Build a ``Sec-WebSocket-Extensions`` header. This is the reverse of :func:`parse_extension`.

(extensions: Sequence[ExtensionHeader])

def build_extension(extensions: Sequence[ExtensionHeader]) -> str:
    """
    Build a ``Sec-WebSocket-Extensions`` header.

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

    """
    return ", ".join(
        build_extension_item(name, parameters) for name, parameters in extensions
    )


build_extension_list = build_extension  # alias for backwards compatibility