You'll need to expand this to support an optional user name at the end of the path.
若要支持在路径的末尾允许出现一个可选的用户名，还需要对之进行扩展。
You're given a user name, a URL, an image name, and an optional S3 bucket name.
您将获得一个用户名、一个 URL、一个照片名和一个可选的 S3 bucket 名。
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?
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？
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