const char* data
Close the connection in an orderly fashion.
Note that until the
SoupWebsocketConnection::closed signal fires, the connection
is not yet completely closed. The close message is not even sent until the
main loop runs.
data are sent to the peer along with the close request.
SOUP_WEBSOCKET_CLOSE_NO_STATUS a close message with no body
(without code and data) is sent.
Note that the
data must be UTF-8 valid.