Title: If Modified Since
Author: ezraverheijen
Published: <strong>2015 年 8 月 17 日</strong>
Last modified: 2015 年 8 月 17 日

---

搜尋外掛

這個外掛**並未在最新的 3 個 WordPress 主要版本上進行測試**。開發者可能不再對這個
外掛進行維護或提供技術支援，並可能會與更新版本的 WordPress 產生使用上的相容性問題。

![](https://s.w.org/plugins/geopattern-icon/if-modified-since.svg)

# If Modified Since

 由 [ezraverheijen](https://profiles.wordpress.org/ezraverheijen/) 開發

[下載](https://downloads.wordpress.org/plugin/if-modified-since.0.9.zip)

 * [詳細資料](https://tw.wordpress.org/plugins/if-modified-since/#description)
 * [使用者評論](https://tw.wordpress.org/plugins/if-modified-since/#reviews)
 *  [安裝方式](https://tw.wordpress.org/plugins/if-modified-since/#installation)
 * [開發資訊](https://tw.wordpress.org/plugins/if-modified-since/#developers)

 [技術支援](https://wordpress.org/support/plugin/if-modified-since/)

## 外掛說明

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](https://github.com/ezraverheijen/wp-if-modified-since).

If you don’t report it, I can’t fix it!

## 安裝方式

 1. Upload the `if-modified-since` folder to the `/wp-content/plugins/` directory
 2. Activate the plugin through the ‘Plugins’ menu in WordPress
 3. No need to configure, it just works!

## 常見問題集

  Do I need this when I already use a caching plugin like W3 Total Cache?

Some plugins like W3TC support the If-Modified-Since header, so there’s no need 
to install this plugin.

  How do I know if the plugin works after installing?

You can test If Modified Since [here](https://varvy.com/tools/if-modified/)

## 使用者評論

![](https://secure.gravatar.com/avatar/a9e1c3b02a34fa228a8b06bc21c3ddf019f45078129cae10f8bd0e474aaef4db?
s=60&d=retro&r=g)

### 󠀁[Breaks sites, empty blank pages for normal visitors](https://wordpress.org/support/topic/breaks-sites-empty-blank-pages-for-normal-visitors/)󠁿

 [amityweb](https://profiles.wordpress.org/amityweb/) 2018 年 9 月 13 日 1 則留言

This plugin caused our site to show blank pages often. The site would initially 
work, then after a reload it was completely blank. No errors or anything. The theme
files failed to load, just completely blank. After investigation it turned out to
be this plugin. Possibly broken due to be being so old. This description should 
scare you off anyway which I should guess what was happening to normal users: “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”

![](https://secure.gravatar.com/avatar/5c9f90d4afcd330f8e303dae3d483865c423b4731de5e880e198cabc91464850?
s=60&d=retro&r=g)

### 󠀁[Deserves a 5 star](https://wordpress.org/support/topic/deserves-a-5-star/)󠁿

 [Jayanta](https://profiles.wordpress.org/jkmwp/) 2016 年 9 月 3 日

Yes, it works. thanks a lot, man. I have been trying to fix it for 3 hours now and
your plugin has made it look so easy.

![](https://secure.gravatar.com/avatar/e2cd8591ee5454dbadd17260dfb625e47675057ef435bf32698de5a75112d12a?
s=60&d=retro&r=g)

### 󠀁[Great!](https://wordpress.org/support/topic/great-4580/)󠁿

 [klinsky](https://profiles.wordpress.org/klinsky/) 2016 年 9 月 3 日

Simple and elegant script code. I checked – it stable works! The Author thanks!

 [ 閱讀全部 3 則使用者評論 ](https://wordpress.org/support/plugin/if-modified-since/reviews/)

## 參與者及開發者

以下人員參與了開源軟體〈If Modified Since〉的開發相關工作。

參與者

 *   [ ezraverheijen ](https://profiles.wordpress.org/ezraverheijen/)

[將〈If Modified Since〉外掛本地化為台灣繁體中文版](https://translate.wordpress.org/projects/wp-plugins/if-modified-since)

### 對開發相關資訊感興趣？

任何人均可[瀏覽程式碼](https://plugins.trac.wordpress.org/browser/if-modified-since/)、
查看 [SVN 存放庫](https://plugins.svn.wordpress.org/if-modified-since/)，或透過 
[RSS](https://plugins.trac.wordpress.org/log/if-modified-since/?limit=100&mode=stop_on_copy&format=rss)
訂閱[開發記錄](https://plugins.trac.wordpress.org/log/if-modified-since/)。

## 變更記錄

#### 0.9

 * Beta release

## 中繼資料

 *  版本 **0.9**
 *  最後更新 **11 年前**
 *  啟用安裝數 **1,000+**
 *  WordPress 版本需求 ** 3.5 或更新版本 **
 *  已測試相容的 WordPress 版本 **4.2.39**
 *  語言
 * [English (US)](https://wordpress.org/plugins/if-modified-since/)
 * 標籤:
 * [if-modified-since](https://tw.wordpress.org/plugins/tags/if-modified-since/)
   [seo](https://tw.wordpress.org/plugins/tags/seo/)
 *  [進階檢視](https://tw.wordpress.org/plugins/if-modified-since/advanced/)

## 評分

 3.7 星，滿分為 5 星

 *  [  2 個 5 星使用者評論     ](https://wordpress.org/support/plugin/if-modified-since/reviews/?filter=5)
 *  [  0 個 4 星使用者評論     ](https://wordpress.org/support/plugin/if-modified-since/reviews/?filter=4)
 *  [  0 個 3 星使用者評論     ](https://wordpress.org/support/plugin/if-modified-since/reviews/?filter=3)
 *  [  0 個 2 星使用者評論     ](https://wordpress.org/support/plugin/if-modified-since/reviews/?filter=2)
 *  [  1 個 1 星使用者評論     ](https://wordpress.org/support/plugin/if-modified-since/reviews/?filter=1)

[撰寫評分](https://wordpress.org/support/plugin/if-modified-since/reviews/#new-post)

[查看全部使用者評論](https://wordpress.org/support/plugin/if-modified-since/reviews/)

## 參與者

 *   [ ezraverheijen ](https://profiles.wordpress.org/ezraverheijen/)

## 技術支援

使用者可在技術支援論壇提出意見反應或使用問題。

 [檢視技術支援論壇](https://wordpress.org/support/plugin/if-modified-since/)

## 贊助

想要支援這個外掛的發展嗎？

 [ 贊助這個外掛 ](http://bit.ly/1eC8iDE)