內容簡介
If Modified Since 可以讓搜尋引擎蜘蛛了解一個網頁的兩個狀態：
這個網頁沒有變動，不需要重新下載。
這個網頁有變動，需要重新下載，因為有新的資訊。
如果蜘蛛所請求的網頁自上次修改以來沒有任何更改，就會回傳 304（未修改）的回應，沒有附帶任何的訊息內容。
如果您使用 If Modified Since 出現任何問題，發現錯誤或有任何想法能讓外掛變得更好，請協助改進 If Modified Since。
如果您不回報問題，我就無法修復它！
外掛標籤
開發者團隊
原文外掛簡介
If Modified Since tells search engine spiders one of two things about a webpage:
This webpage has not changed, no need to download again.
This webpage has changed so download again because there is new information.
If the requested page has not been modified since the time specified by a search engine spider, a 304 (not modified) response will be returned without any message-body.
If you have any issues using If Modified Since, find a bug or have an idea to make the plugin even better then please help to improve If Modified Since.
If you don’t report it, I can’t fix it!
