static HttpSession get(Channel ch) {
        final ChannelHandler lastHandler = ch.pipeline().last();
        if (lastHandler instanceof HttpSession) {
            return (HttpSession) lastHandler;
        }
        return INACTIVE;
    }
2^29 - We could have used 2^30 but this should be large enough.
core/src/main/java/com/linecorp/armeria/internal/client/HttpSession.java