code: public WebSocket sendBinary(byte[] payload, boolean fin)
      {
          return sendFrame(WebSocketFrame.createBinaryFrame(payload).setFin(fin));
      }
docs: Send a binary frame to the server.
  
  <p>
  This method is an alias of {@link #sendFrame(WebSocketFrame)
  sendFrame}{@code (WebSocketFrame.}{@link
  WebSocketFrame#createBinaryFrame(byte[])
  createBinaryFrame}{@code (payload).}{@link
  WebSocketFrame#setFin(boolean) setFin}{@code (fin))}.
  </p>
  
  @param payload
  The payload of a binary frame.
  
  @param fin
  The FIN bit value.
  
  @return
  {@code this} object.