网关中的订阅令牌符号处理程序识别订阅消息头。
The subscription token handler in the Gateway identifies the subscription header.
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?
使用这种方案时，由于限定名不变，处理程序总能识别出订阅令牌符号。
When using this approach, handlers always recognize the subscription token header because the qualified name does not change.
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