此 URI 的第二个语义含义则是在原始传输特定回发通道不可用时发挥作用（例如，连接已断开时）。
The second semantic meaning of this URI applies when the original transport-specific back channel is not available (for example, the connection was broken).
工作项的创建、传输和删除必须在原始对象上进行。
Work item creation, transfer, and deletion must occur on the original object.
代理服务器传输插件依赖原始域上的一个代理服务器服务。
The proxy server transport plug-in relies on a proxy server service on the original domain.
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