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Send a websocket close control frame.
void close( close_reason const& cr, error_code& ec);
This function is used to send a close frame, which begins the websocket closing handshake. The session ends when both ends of the connection have sent and received a close frame. The call blocks until one of the following conditions is true:
            The algorithm, known as a composed operation, is
            implemented in terms of calls to the next layer's write_some
            function. After beginning the closing handshake, the program should not
            write further message data, pings, or pongs. Instead, the program should
            continue reading message data until an error occurs. A read returning
            error::closed indicates a successful
            connection closure.
          
| Name | Description | 
|---|---|
| 
                       | The reason for the close. If the close reason specifies a close code other than beast::websocket::close_code::none, the close frame is sent with the close code and optional reason string. Otherwise, the close frame is sent with no payload. | 
| 
                       | Set to indicate what error occurred, if any. |