BEGINNING_SPACE.matcher(key2).replaceAll("").length());
long c = req.content().readLong();
ByteBuf input = Unpooled.buffer(16);
input.writeInt(a);
input.writeInt(b);
input.writeLong(c);
res.content().writeBytes(WebSocketUtil.md5(input.array()));
} else {
// Old Hixie 75 handshake getMethod with no challenge:
res.headers().add(HttpHeaderNames.WEBSOCKET_ORIGIN, req.headers().get(HttpHeaderNames.ORIGIN));
res.headers().add(HttpHeaderNames.WEBSOCKET_LOCATION, uri());