客户机应该不必分辨出资源的定位，与什么协议彼此相应，以及什么API应该用于向其发送消息。

A client should not have to know where a resource is located, what protocol it responds to, and what API should be used to send a message to it.

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可将URI看作是幕后没有协议处理程序的统一资源定位符(uniform resource locator, URL)。

Think of a URI as a uniform resource locator (URL) without a protocol handler behind it.

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