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                # 4.13 If-Unmodified-Since > 作者:肖鵬-SpiritLing 時間:2018-11-24 ```http If-Unmodified-Since: Thu, 03 Jul 2018 00:00:00 GMT ``` 首部字段 `If-Unmodified-Since` 和首部字段 `If-Modified-Since` 的作用相反。它的作用就是告知服務器,指定的請求資源只有在字段值內定的日期時間之后,未發生更新的情況下,才能處理請求。如果在指定日期時間后發生了更新,則以狀態碼 412 Precondition Failed 作為響應返回。 > 作者:肖鵬-SpiritLing 時間:2018-11-24
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