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120.txt
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120.txt
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[31] [DFN[[[AppCache]]]] は、[[クライアント側Webアプリケーション]]の関連ファイル一式を
[[Webブラウザー]]に[[キャッシュ]]するための仕組みです。この機能は2007年に
[[HTML5]] に追加され、その後各 [[Webブラウザー]]で実装されました。
* 呼称
[25] 元々本機能全体を表す明確な用語はありませんでしたが、2011年頃から AppCache
と呼ばれるようになっています。
* 構成要素
[FIG(short list)[
- [[キャッシュマニフェスト]]
- [CODE(HTMLa)@en[[[manifest]]]] [[属性]]
- [CODE(DOMi)@en[[[ApplicationCache]]]]
- [[アプリケーションキャッシュ選択アルゴリズム]]
]FIG]
* 歴史
[17] [CITE['''['''whatwg''']''' Offline Web Apps]] ([CODE[2007-09-08 07:21:56 +09:00]] 版) <http://www.mail-archive.com/whatwg@lists.whatwg.org/msg07556.html>
[18] [CITE[Latest proposal for offline web app API]] ([[Ian Hickson <ian@...>]] 著, [CODE[2007-09-21 10:36:07 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/11832>
[19] [CITE[Re: Google Gears and HTML5]] ([[Ian Hickson <ian@...>]] 著, [CODE[2007-10-09 07:03:00 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/11960>
[20] [CITE[HTML5: Offline Web Applications - Anne’s Weblog]] ([CODE[2007-10-07 02:38:50 +09:00]] 版) <http://annevankesteren.nl/2007/10/offline>
[21] [CITE[Caching offline Web applications]] ([[Ian Hickson <ian@...>]] 著, [TIME[2008-10-18 01:36:31 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/16043>
[16] [CITE[Re: Caching offline Web applications]] ([[Ian Hickson]] 著, [TIME[2008-11-18 04:05:08 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/16623>
[22] [CITE[Bug 23165 - Add support for application cache dynamic entries]] ([TIME[2009-01-19 12:18:06 +09:00]] 版) <https://bugs.webkit.org/show_bug.cgi?id=23165>
[23] [CITE@en[Dynamic entries in the Application Cache removed]] ([[Ian Hickson]] 著, [TIME[2009-01-22 10:22:47 +09:00]] 版) <http://lists.w3.org/Archives/Public/public-html/2009Jan/0287.html>
[24] [CITE@en-us[Firefox 3.1 for developers - MDC]] ([TIME[2009-02-08 18:25:06 +09:00]] 版) <https://developer.mozilla.org/ja/Firefox_3.1_for_developers#.E6.96.B0.E3.81.97.E3.81.8F.E3.82.B5.E3.83.9D.E3.83.BC.E3.83.88.E3.81.95.E3.82.8C.E3.81.9F.E6.A9.9F.E8.83.BD_2>
>HTML5 Offline Specification のサポートが完了しました。
[1] [CITE['''['''whatwg''']''' Appcache feedback (various threads)]]
([TIME[2011-02-01 09:31:33 +09:00]] 版)
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2011-January/030136.html>
[2] [CITE@en[Web Applications 1.0 r5812 Change the suggested extension for appcache manifests from .manifest to .appcache to avoid clashing with Microsoft's unregistered application/manifest type]]
( ([TIME[2011-02-01 09:42:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=5811&to=5812>
[3] [CITE['''['''whatwg''']''' AppCache-related e-mails]]
([TIME[2011-06-17 09:50:54 +09:00]] 版)
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2011-June/031964.html>
[4] [CITE[''''''[''''''whatwg'''''']'''''' AppCache-related e-mails]]
( ([TIME[2011-08-04 23:37:37 +09:00]] 版))
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-August/032771.html>
[5] [CITE@en[Web Applications 1.0 r6920 Remove vestiges of MIME type checking in appcache.Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=14701]]
( ([TIME[2012-01-26 08:27:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=6919&to=6920>
[6] [CITE[''''''[''''''whatwg'''''']'''''' Can we change the base URL of fallback entries in appcache manifests? and other feedback]]
( ([TIME[2012-05-08 08:27:59 +09:00]] 版))
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2012-May/035712.html>
[7] [CITE@en[Web Applications 1.0 r7136 Add a feature to appcache to make it possible to mark a cache as preferring online resources than cached resources.]]
( ([TIME[2012-06-15 07:48:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=7135&to=7136>
[8] [CITE[Bug 60493 – ApplicationCache - feature request for a way to override the fallback behavior]]
( ([TIME[2012-12-12 08:53:05 +09:00]] 版))
<https://bugs.webkit.org/show_bug.cgi?id=60493>
[10] [CITE[''''''[''''''whatwg'''''']'''''' The src-N proposal]]
( ([TIME[2013-11-08 20:17:35 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2013-November/041374.html>
[11] [CITE@en[Application Cache API ("AppCache") (Windows)]]
( ([TIME[2013-11-13 13:51:54 +09:00]] 版))
<http://msdn.microsoft.com/en-us/library/ie/hh673545(v=vs.85).aspx>
[12] [CITE@en[Bug 22702 – appcache: More detailed error information]]
( ([TIME[2014-02-14 13:09:51 +09:00]] 版))
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=22702>
[13] [CITE[IRC logs: freenode / #whatwg / 20140213]]
( ([TIME[2014-02-14 20:43:39 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20140213#l-467>
[14] [CITE@en[Re: ''''''[''''''whatwg'''''']'''''' AppCache Content-Type Security Considerations]]
( ([[Ian Hickson]] 著, [TIME[2014-05-13 08:17:31 +09:00]] 版))
<http://lists.w3.org/Archives/Public/public-whatwg-archive/2014May/0076.html>
[15] [CITE[IRC logs: freenode / #whatwg / 20140515]]
( ([TIME[2014-05-17 18:12:00 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20140515#l-987>
[28] [CITE[''''''[''''''whatwg'''''']'''''' Fwd: fallback section taking over for 4xx and 5xx responses while online]]
( ([TIME[2012-12-11 01:01:52 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-December/038292.html>
** ServiceWorker
[26] [[AppCache]] は広く実装されるに至りましたが、実用上の様々な問題から、
代替策が議論されるようになりました。
[REFS[
- [9] [CITE@en[Fixing appcache: a proposal to get us started]]
( ([[Jonas Sicking]] 著, [TIME[2013-03-26 16:02:58 +09:00]] 版))
<http://lists.w3.org/Archives/Public/public-webapps/2013JanMar/0977.html>
]REFS]
[27] 2013年以後 [[ServiceWorker]] の開発が進められ、 [[AppCache]]
にかわるものとして期待されています。 [[AppCache]] への新機能の追加は保留状態となっています。
[29] [CITE@en[Web Applications 1.0 r8739 Attempt to mitigate the injection elevation attack on appcache, and describe the attack in detail]]
( ([TIME[2014-09-04 06:39:00 +09:00]] 版))
<http://html5.org/r/8739>
[30] [CITE@en[Web Applications 1.0 r8791 Make appcache requests have no referrer, since it's not clear what referrer to use.]]
( ([TIME[2014-09-20 02:52:00 +09:00]] 版))
<https://html5.org/r/8791>
[32] [CITE@en[Web Applications 1.0 r8823 Mention cookie-bombing in the appcache section]]
( ([TIME[2014-09-27 08:44:00 +09:00]] 版))
<https://html5.org/r/8823>
* 濫用
[REFS[
- [33] [CITE[HTML5における no-cache - Qiita]] ([TIME[2014-10-06 08:48:29 +09:00]] 版) <http://qiita.com/hidekuro/items/dea83ebdf73e2f2277ae>
]REFS]
[34] >>33 は [CODE(HTTP)@en[[[Cache-Control:]] [[no-cache]]]] の意味に
[[AppCache]] を濫用する方法を提案しています。