} else if (frame instanceof BinaryWebSocketFrame) {
        BinaryWebSocketFrame binaryFrame = (BinaryWebSocketFrame) frame;
        ByteBuf bf = binaryFrame.content();
        byte[] bytes = new byte[bf.capacity()];
        bf.readBytes(bytes);
        if (bytes[0] == (GZIPInputStream.GZIP_MAGIC & 0x00ff) && bytes[1] == (GZIPInputStream.GZIP_MAGIC & 0xff00) >> 8) {  // upbit GZIPInputStream.
            GZIPInputStream gzipInputStream = new GZIPInputStream(new ByteArrayInputStream(bytes));
            ByteArrayOutputStream result = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int length;
            while ((length = gzipInputStream.read(buffer)) != -1) {
                result.write(buffer, 0, length);
            }
            handler.onMessage(result.toString());
        } else {
            handler.onMessage(new String(bytes));  // upbit
        }
    }