客户端订阅一个Hub，当feed有更新时Hub会即时通知客户端。
The client subscribes to a Hub and it is almost instantly notified when the feed is updated.
我们为什么不给PSHB协议添加一种简单机制，当客户端订阅推送更新时会留下一些识别信息，如姓名、头像等？
Why couldn't we add a simple mechanism to PubSubHub so that when a client subscribes to push updates, it leaves behind some optional identifying information about the user like their name and avatar?
这完成了客户端处理程序为这种订阅令牌符号的场景而作出的必要的修改。
This completes the necessary changes that must be made to the client handler for this subscription token scenario.
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