放入修订记录的目的是为了明确当前译本是基于官方文档的哪一个版本，如果以后能够及时的查看《URL Session Programming Guide》的版本变化，我会根据版本对译本进行修改。
| 日期 | 记录 |
|---|---|
| 2016-09-13 | Removes discussion of deprecated URL Loading System classes, including NSURLConnection.（移除NSURLConnection等过时类） |
| ... | |
| 2003-06-06 | First release of conceptual and task material covering the usage of new classes in Mac OS X v10.2 with Safari 1.0 for downloading content from the Internet. |
翻译完成于：
2017-10-16