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Predicate ws_close/3
 ws_close(+WebSocket:stream_pair, +Code, +Data) is det
Close a WebSocket connection by sending a close message if this was not already sent and wait for the close reply.
Arguments:
Code- is the numerical code indicating the close status. This is 16-bit integer. The codes are defined in section 7.4.1. Defined Status Codes of RFC6455. Notably, 1000 indicates a normal closure.
Data- is currently interpreted as text.
Errors
- websocket_error(unexpected_message, Reply) if the other side did not send a close message in reply.
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