:sig
function ws_send_to(connection_id : string, message : string, binary : bool, request : capture dval) bool

:params
request : the caller's request, captured when omitted
connection_id : client ID
message : message bytes to send
binary : `true` for a binary frame

:returns
`true` when the server queues the message.

:content
`ws_send_to()` sends a message to one client.

:example capy ws
ws_send_to(string(request.websocket.connection_id), "hello", false)

:see-group
websocket
