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Send a websocket pong control frame.
void pong( ping_data const& payload, error_code& ec);
This function is used to send a pong frame, which is usually sent automatically in response to a ping frame from the remote peer. 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. WebSocket allows pong frames to be sent at any time, without
            first receiving a ping. An unsolicited pong sent in this fashion may
            indicate to the remote peer that the connection is still active.
          
| Name | Description | 
|---|---|
| 
                       | The payload of the pong message, which may be empty. | 
| 
                       | Set to indicate what error occurred, if any. |