long c = req.data().readLong();
ByteBuf input = Unpooled.buffer(16);
input.writeInt(a);
input.writeInt(b);
input.writeLong(c);
res.data().writeBytes(WebSocketUtil.md5(input.array()));
} else {
// Old Hixie 75 handshake getMethod with no challenge:
res.headers().add(WEBSOCKET_ORIGIN, req.headers().get(ORIGIN));
res.headers().add(WEBSOCKET_LOCATION, uri());
String protocol = req.headers().get(WEBSOCKET_PROTOCOL);