HTTP 1.1介绍了另外一个校验参数：ETag，服务器是服务器生成的唯一标识符etag，每次副本的标签都会变化。

HTTP 1.1 introduced a new kind of validator called the ETag. ETags are unique identifiers that are generated by the server and changed every time the representation does.

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由于文件传输是一种标准技术，这里不作过多介绍，您只需了解客户机将下载清单1中服务配置数据的一个文件副本。

Because file transfer is standard technology, I won't go into detail except to say that the client downloads a file copy of the service profile data in Listing 1.

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原始的存储库和其副本均包含同样的数据地图对象，这是因为数据地图是不能修改的，这一点在本文稍后的部分介绍。

Both the original repository and its copy will contain the same data map objects, which is correct because data maps cannot be modified, as you'll see later in this article.

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