feedburnerの一ヶ月に渡るfeedリダイレクション期間

feedburnerのサービスを止めたくなり，feedburnerのフィードから元のフィードに戻したい場合，一ヶ月に渡るfeedリダイレクション期間を設けて元のフィードにリダイレクトさせるしくみが付いた。

So, beginning today, we're providing a detailed service for publishers who choose to leave FeedBurner. When you delete your FeedBurner feed, we have added an option to redirect your feed. If you select this, we begin a one month process of transitioning your subscribers back to your source feed. This is the interesting part; because of the very different capabilities of the different feed readers, we have to take a few different approaches.

普通はHTTP 301 "Permanent Redirect"で事足りるけれども，Permanent Redirectを"Temporary Redirect"と解釈してしまうfeedリーダーがあるので，feedburnerではDave Winerの規定したスペックであるredirect documentをfeedリーダーがサポートして確実にリダイレクトさせるように推奨している。

Secondly, we will enthusiastically promote feed readers to support Dave Winer's feed redirect specification. While, in a perfect world, a 301 permanent redirect would be the "one true answer", the reality is quite different. Providing a redirect document is a much more explicit intention and gives publishers the freedom to move their feeds at will. This mechanism currently works with NetNewsWire and some other readers, and we strongly encourage other feed readers to support this specification.

30日後にはfeedburnerのフィードは永久に消去されて，リクエストすると"Feed Not Found"が返ってくるようになる。
void GraphicWizardsLair( void ); //によれば301による自動修正に対応していないRSSリーダーには以下がある。

301による自動修正に対応していないRSSリーダーを簡易リストアップしてみた。
AppleSyndication/38
Becky! BlogReader/1.2
BlogSearch/1.1 +http://www.icerocket.com/
Blogdigger/2.0 (http://www.blogdigger.com/; contact@blogdigger.com)
CFNetwork/1.1
Comaneci_bot/2.0 (+http://help.i-know.jp/?crawler)
Desktop Sidebar v1.04.75.0
FNavigator/1.0b1 (http://www.mobirus.com/)
FeedDemon/1.5 (http://www.bradsoft.com/; Microsoft Windows XP)
FeedOnFeeds/0.1.7 (+http://minutillo.com/steve/feedonfeeds/)
GreatNews/1.0
Hatena Antenna/0.4 (http://a.hatena.ne.jp/help)
Hatena RSS/0.1
Headline-Reader [t] (http://www.infomaker.jp/)
Headline-Reader [t] (www.infomaker.jp)
Heimdallr 1.09alpha1
HepCat: http://www.witha.jp/
Java/1.4.2_02
JetBrains Omea Reader 1.0.4 (http://www.jetbrains.com/omea_reader/)
KissReader/0.7.1
LWP::Simple/5.65
Miech/600
NATSU-MICAN/3.1b(20010312)
NetNewsWire/2.0 (Mac OS X; Lite; http://ranchero.com/netnewswire/)
NetNewsWire/2.0 (Mac OS X; http://ranchero.com/netnewswire/)
NewsFire/30
NewsGatorOnline/2.0 (http://www.newsgator.com; 2 subscribers)
Opera/8.0 (Windows NT 5.0; U; en)
Opera/8.0 (Windows NT 5.1; U; ja)
PAIPO-Bot 0.1b
PukiWiki/1.4.2
PukiWiki/1.4.3
PulpFiction/1.2.1
PulpFictionLite/1.2.0
PulpFictionLite/1.2.1
RNA 2.0b1 (build 041026) libwww-perl/5.69
RNA pre2.0 (build 040902) libwww-perl/5.69
RNA pre2.0b2 (build 050324) libwww-perl/5.69
RNA/libwww-perl/5.69
RSSGate/0.9 (http://www.geocities.jp/nao_rssgate/)
RSSOwl/1.1 2005-03-24 (Windows; U; ja)
RThReader/2.0
RssBandit/1.3.0.29 (.NET CLR 1.1.4322.2032; WinNT 5.1.2600.0; http://www.rssbandit.org)
RssBar/1.02
RssBar/1.12
RssBar/1.13
RssBar/1.14
RssBar/1.15
RssBar/1.20
SharpReader/0.9.5.1 (.NET CLR 1.1.4322.2032; WinNT 5.0.2195.0)
SharpReader/0.9.5.1 (.NET CLR 1.1.4322.573; WinNT 5.1.2600.0)
Snoopy v1.01
Syndic8/1.0 (http://www.syndic8.com/)
WWWC/1.04
YouReadMe Feedeater 1.0
blogmap cralwer
blogmap crawler(http://1470.net/)
cococ/1.03
eCruiser Build20050315
glucose/1.0-448
glucose2/2.0-20050313
livedoorCheckers/0.11
lwp-trivial/1.35
lwp-trivial/1.38
msnbot/1.0 (+http://search.msn.com/msnbot.htm)
rAntenna 0.0.5
samidare
wiliki/rssmix http://www.shiro.dreamhost.com/scheme/wiliki/rssmix3.cgi
yubisakiAntenna/0.1.6 (hidari; http://web-ya.jp/yubi/)
という結果になった。

http://www.burningdoor.com/feedburner/archives/001251.html
http://www.otsune.com/diary/2005/06/09/6.html#200506096
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