[48] 仕様書: - [[HTML 2.0]]: [[RFC 1866]] 5.2.5. Associated Meta-information: META [[#comment]] [51] HTTP 鯖は、 [CODE(HTMLa)[http-equiv]] 属性付きの [CODE(HTMLe)[meta]] 要素を使って頭を作っても構いません [SRC[RFC 1866 5.2.5, HTML 4]]。ただし、その方法は規定されていませんし、使用することが強制されてもいません [SRC[RFC 1866 5.2.5]]。しかし、 [CODE(HTMLa)[http-equiv]] なき [CODE(HTMLe)[meta]] 要素を生成に使ってはなりません [SRC[RFC 1866 5.2.5]]。また、 [CODE(HTTP)[[[Date]]]], [CODE(HTTP)[[[Server]]]], [CODE(HTTP)[[[Last-Modified]]]] のような鯖が生成する情報に関する [CODE(HTMLe)[meta]] 情報は捨てても構いません [SRC[RFC 1866 5.2.5]]。 [50] [[M$DN]] の記事によると、 [CODE(HTTP)[[[Pragma]]]] とかでは HTML でも HTTP 頭でも認識するけど [CODE(HTTP)[[[Cache-Control]]]] は HTTP 頭じゃないと認識しないようにわざとしているとか。だからまったく何も考えていないで行き当たりばったりというわけでもない、と。 [83] Is very interesting http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-34.htm ([[Daniel]] [Michael@hotmail.com] [WEAK[2006-09-14 08:46:05 +00:00]]) [116] This great resource poker 29 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-29.htm]poker 29[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-29.htm ([[John]] [George@mail.com] [WEAK[2006-09-18 12:10:10 +00:00]]) [117] i like you! poker 30 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-30.htm]poker 30[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-30.htm ([[Leonard]] [Alton@mail.com] [WEAK[2006-09-18 14:05:22 +00:00]]) [124] Is very interesting pp [url=http://xoomer.alice.it/pidr/pp/]pp[/url] http://xoomer.alice.it/pidr/pp/ ([[Michael]] [Matthew@hotmail.com] [WEAK[2006-09-21 03:40:19 +00:00]]) [[#comment]] * 用例のある、正当な頭欄の名前 [25] ここで「正当」とは、 [[HTTP]] などの仕様書や原案で規定・提案されているものや、 HTTP 頭欄として何らかの取り扱いを行う実装が見つかっているもののことを言います。 - [26] [CODE(HTTP)[[[Content-Type]]]] - [27] [CODE(HTTP)[[[Content-Style-Type]]]] - [28] [CODE(HTTP)[[[Content-Script-Type]]]] - [29] [CODE(HTTP)[[[Default-Style]]]] - [30] [CODE(HTTP)[[[Expires]]]] - [31] [CODE(HTTP)[[[Refresh]]]] - [32] [CODE(HTTP)[[[Pragma]]]] - [33] [CODE(HTTP)[[[Cache-Control]]]] - [34] [CODE(HTTP)[[[Content-Language]]]] - [35] [CODE(HTTP)[[[Window-Target]]]] - [36] [CODE(HTTP)[[[Content-Script-Language]]]] ([CODE(HTTP)[Content-Script-Type]] の旧名) - [37] [CODE(HTTP)[[[Content-Version]]]] - [38] [CODE(HTTP)[[[Ext-Cache]]]] - [39] [CODE(HTTP)[[[MSThemeCompatible]]]] - [40] [CODE(HTTP)[[[Site-Enter]]]] - [41] [CODE(HTTP)[[[Site-Exit]]]] - [42] [CODE(HTTP)[[[Keywords]]]] - [43] [CODE(HTTP)[[[SHOE:]]]] - [44] [CODE(HTTP)[[[Page-Enter]]]] - [45] [CODE(HTTP)[[[Page-Exit]]]] - [46] [CODE(HTTP)[[[Reply-To]]]] - [47] [CODE(HTTP)[[[ImageToolbar]]]] - [60] [CODE(HTTP)[[[Vary]]]] - [61] [CODE(HTTP)[[[Set-Cookie]]]] - [62] [CODE(HTTP)[[[PICS-Label]]]] - [64] [CODE(HTTP)[[[Link]]]] ([[HTML 5]]で処理方法が明記されている) - [71] [CODE(HTTP)[[[]]]] (Cool design http://jobs.msdinc.com/Members/de/free-poker-site.html ) - [150] [CODE(HTTP)[[[]]]] (Thank you... http://xoomer.alice.it/fe7/poker-chips-set/ ) -[152] [CODE(HTTP)[[[]]]] (Best site [url=http://best.delmatrix.com/map.html]free soft[/url] cool site!!) [[#form:'%text(label=>値,size=>10,id=>value); %text(label=>参考,size=>20,id=>comment);':'-[%index;] [CODE(HTTP)[[[%text(source=>value);]]]]%text(prefix=>" (",suffix=>")",source=>comment);']] * 明らかに name 属性と勘違いしてる値を挙げろ! - [2] 勝手に馬鹿が捏造した [[HTTP]] [[頭欄]]の名前を挙げる! - [1] [CODE(HTML)[author]] (ぐぐるとかなりでてくる!) - [3] [CODE(HTML)[keywords]] - [4] [CODE(HTML)[description]] - [5] [CODE(HTML)[generator]] - [6] [CODE(HTML)[copyright]] - [8] [CODE(HTML)[Author/ Creator]] ([CODE(HTML)[NAME="GENERATOR" CONTENT="Adobe PageMill 3.0 Win"]] と書いてあるが、 [[PageMill]] がやったのか著者がやったのか不明。) - [9] [CODE(HTML)[distribution]] (値 [CODE(HTML)[global]] >>8) - [10] [CODE(HTML)[resource-type]] (値 [CODE(HTML)[document]] >>8) - [11] [CODE(HTML)[robots]] - [12] [CODE(HTML)[authoring_tool]] - [13] [CODE(HTML)[resource_type]] (>>10 と同じらしい。 >>9 も >>10 も値は [[CaseInsensible]] のようだ。非 PageMill の用例あり) - [14] [CODE(HTML)[DC.Descrioption]] - [15] [CODE(HTML)[title]] (HTTP にも [[Title:]] 欄がありましたが。。。) - [16] [CODE(HTML)[revisit-after]] (値 [CODE(HTML)[30 days]]。 [[Retry-After:]] 欄の人間向け版?) - [17] [CODE(HTML)[rating]] (値 [CODE(HTML)[general]]) - [18] [CODE(HTML)[owner]] (自由文) - [19] [CODE(HTML)[abstract]] (自由文) - [20] [CODE(HTML)[security]] (値 [CODE(HTML)[public]]) - [66] [CODE(HTML)[]] (Interesting site http://oooauthors.org/Members/derik/poker.html ) - [67] [CODE(HTML)[]] (It very interesting http://www.tchezope.org/Members/de/poker-6.htm ) - [68] [CODE(HTML)[]] (Great work on website. http://www.tchezope.org/Members/de/poker-5.htm ) - [69] [CODE(HTML)[]] (Great work on website. http://jobs.msdinc.com/Members/de/poker-table.html ) - [70] [CODE(HTML)[]] (Hi, nice site! http://www.urbansim.org/plone/Members/de/poker-14.htm ) - [72] [CODE(HTML)[]] (archy it i http://pen.bme.gatech.edu/Members/de/poker-20.htm ) - [73] [CODE(HTML)[]] (VERY GOOD I THINK http://learning.swc.hccs.edu/members/de/poker-21.htm ) - [74] [CODE(HTML)[]] (Great work on website. http://kaon.semanticweb.org/Members/de/poker-22.htm ) - [75] [CODE(HTML)[]] (Great work on website. http://tdweb.fnal.gov/CIS/Members/de/poker-24.htm ) - [76] [CODE(HTML)[]] (Your hard work paid off http://xoomer.alice.it/a3e/internet-car-insurance/ ) - [77] [CODE(HTML)[]] (Thank you... http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-27.htm ) - [78] [CODE(HTML)[]] (Very nice site! http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-28.htm ) - [79] [CODE(HTML)[]] (Very good site http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-29.htm ) - [80] [CODE(HTML)[]] (this site rocks! http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-30.htm ) - [81] [CODE(HTML)[]] (It very interesting http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-31.htm ) - [82] [CODE(HTML)[]] (Good Luck! http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-33.htm ) - [84] [CODE(HTML)[]] (archy it i http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-35.htm ) - [85] [CODE(HTML)[]] (Is very interesting http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-36.htm ) - [86] [CODE(HTML)[]] (Very nice site! http://xoomer.alice.it/a3e/foreclosure/ ) - [87] [CODE(HTML)[]] (Very nice site! http://pen.bme.gatech.edu/Members/koz/1/poker-37.htm ) - [88] [CODE(HTML)[]] (Your hard work paid off http://pen.bme.gatech.edu/Members/koz/1/poker-38.htm ) - [89] [CODE(HTML)[]] (It very interesting http://pen.bme.gatech.edu/Members/koz/1/poker-39.htm ) - [90] [CODE(HTML)[]] (Thanks for taking http://pen.bme.gatech.edu/Members/koz/1/poker-40.htm ) - [91] [CODE(HTML)[]] (Great work on website. http://pen.bme.gatech.edu/Members/koz/1/poker-41.htm ) - [92] [CODE(HTML)[]] (thanks for mentioning http://www.ballview.org/Members/pi/poker-42.htm ) - [93] [CODE(HTML)[]] (Interesting site http://www.andreaskapsalis.com/includes/2/ ) - [94] [CODE(HTML)[]] (Very nice site http://thisdarkqualm.com/wp-content/cache/p/ ) - [95] [CODE(HTML)[]] (Very good site http://bloomhost.net/cache/inc/ ) - [96] [CODE(HTML)[]] (Exciting website. http://www.cognitie.nl/Members/de/poker-43.htm ) - [97] [CODE(HTML)[]] (Thanks for taking http://projects.objectrealms.net/Members/derik/poker-44.htm ) - [98] [CODE(HTML)[]] (Cool design http://repo.isis.vanderbilt.edu/Members/de/poker-45.htm ) - [99] [CODE(HTML)[]] (this site rocks! http://www.opensourcearmenia.com/Members/brr/1.html ) - [100] [CODE(HTML)[]] (Great work on website. http://www.opensourcearmenia.com/Members/brr/2.html ) - [101] [CODE(HTML)[]] (Very nice site http://www.opensourcearmenia.com/Members/brr/3.html ) - [102] [CODE(HTML)[]] (Very nice site! http://www.opensourcearmenia.com/Members/brr/4.html ) - [103] [CODE(HTML)[]] (Thank you... http://www.opensourcearmenia.com/Members/brr/5.html ) - [104] [CODE(HTML)[]] (Very good website http://www.bloopdiary.com/users/72599/poker-46.htm ) - [105] [CODE(HTML)[]] (Exciting website. http://www.bloopdiary.com/users/72599/poker-47.htm ) - [106] [CODE(HTML)[]] (Very nice site! http://www.bloopdiary.com/users/72599/poker-48.htm ) - [107] [CODE(HTML)[]] (Cool design http://www.shalem.org/Members/de/poker-49.htm ) - [108] [CODE(HTML)[]] (Very good website http://www.opensourcearmenia.com/Members/brr/6.html ) - [109] [CODE(HTML)[]] (It very interesting a spyware [url=http://xoomer.alice.it/n31/a-spyware/]a spyware[/url] http://xoomer.alice.it/n31/a-spyware/) - [110] [CODE(HTML)[]] (archy it i poker game [url=http://xoomer.alice.it/po4/poker-game/]poker game[/url] http://xoomer.alice.it/po4/poker-game/) - [111] [CODE(HTML)[]] (Hi, nice site! freeroll poker tournaments [url=http://xoomer.alice.it/po4/freeroll-poker-tournaments/]freeroll poker tournaments[/url] http://xoomer.alice.it/po4/freeroll-poker-tournaments/) - [112] [CODE(HTML)[]] (i like you! slot machine [url=http://xoomer.alice.it/a3e/slot-machine/]slot machine[/url] http://xoomer.alice.it/a3e/slot-machine/) - [113] [CODE(HTML)[]] (Thank you... laser hair removal [url=http://xoomer.alice.it/a3e/laser-hair-removal/]laser hair removal[/url] http://xoomer.alice.it/a3e/laser-hair-removal/) - [114] [CODE(HTML)[]] (this site rocks! poker 26 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-26.htm]poker 26[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-26.htm) - [115] [CODE(HTML)[]] (Very useful poker [url=http://ibo.awardspace.com/poker/]poker[/url] http://ibo.awardspace.com/poker/) - [118] [CODE(HTML)[]] (Very good site poker 31 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-31.htm]poker 31[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-31.htm) - [119] [CODE(HTML)[]] (Hi, nice site! poker 33 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-33.htm]poker 33[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-33.htm) - [120] [CODE(HTML)[]] (archy it i poker 34 [url=http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-34.htm]poker 34[/url] http://neumann.sk.tsukuba.ac.jp/plone/Members/de/poker-34.htm) - [121] [CODE(HTML)[]] (thanks for mentioning poker 50 [url=http://clepy.org/Members/kaka/poker-50.htm]poker 50[/url] http://clepy.org/Members/kaka/poker-50.htm) - [122] [CODE(HTML)[]] (Thank you... ge [url=http://xoomer.alice.it/pidr/ge/]ge[/url] http://xoomer.alice.it/pidr/ge/) - [123] [CODE(HTML)[]] (Very nice site! internet poker [url=http://free.45.kg/pisya/poker-internet.htm]internet poker[/url] http://free.45.kg/pisya/poker-internet.htm) - [125] [CODE(HTML)[]] (Thank you... 5 [url=http://xoomer.alice.it/4fr/5/]5[/url] http://xoomer.alice.it/4fr/5/) - [126] [CODE(HTML)[]] (Interesting site 1 [url=http://xoomer.alice.it/naxibo/1/]1[/url] http://xoomer.alice.it/naxibo/1/) - [127] [CODE(HTML)[]] (Great work on website. 3 [url=http://xoomer.alice.it/naxibo/3/]3[/url] http://xoomer.alice.it/naxibo/3/) - [128] [CODE(HTML)[]] (Very useful 4 [url=http://xoomer.alice.it/naxibo/4/]4[/url] http://xoomer.alice.it/naxibo/4/) - [129] [CODE(HTML)[]] (Great web site 5 [url=http://xoomer.alice.it/naxibo/5/]5[/url] http://xoomer.alice.it/naxibo/5/) - [130] [CODE(HTML)[]] (Very nice site foreclosure [url=http://xoomer.alice.it/kuk1/foreclosure/]foreclosure[/url] http://xoomer.alice.it/kuk1/foreclosure/) - [131] [CODE(HTML)[]] (It very interesting satellite tv [url=http://xoomer.alice.it/kuk1/satellite-tv/]satellite tv[/url] http://xoomer.alice.it/kuk1/satellite-tv/) - [132] [CODE(HTML)[]] (Interesting site morongo [url=http://xoomer.alice.it/icrest/morongo/]morongo[/url] http://xoomer.alice.it/icrest/morongo/) - [133] [CODE(HTML)[]] (It very interesting rewards [url=http://xoomer.alice.it/icrest/rewards/]rewards[/url] http://xoomer.alice.it/icrest/rewards/) - [134] [CODE(HTML)[]] (VERY GOOD I THINK arizona [url=http://xoomer.alice.it/icrest/arizona/]arizona[/url] http://xoomer.alice.it/icrest/arizona/) - [135] [CODE(HTML)[]] (Thanks for taking bn [url=http://xoomer.alice.it/ddoys/bn/]bn[/url] http://xoomer.alice.it/ddoys/bn/) - [136] [CODE(HTML)[]] (Great web site casino [url=http://cas.awardspace.biz/casino/]casino[/url] http://cas.awardspace.biz/casino/) - [137] [CODE(HTML)[]] (thanks for mentioning lemon law [url=http://lemon.awardspace.biz/lemon-law/]lemon law[/url] http://lemon.awardspace.biz/lemon-law/) - [138] [CODE(HTML)[]] (thanks for mentioning spyware removal [url=http://spy.awardspace.biz/spyware-removal/]spyware removal[/url] http://spy.awardspace.biz/spyware-removal/) - [139] [CODE(HTML)[]] (thanks for mentioning slot machine [url=http://slot.awardspace.biz/slot-machine/]slot machine[/url] http://slot.awardspace.biz/slot-machine/) - [140] [CODE(HTML)[]] (Very good site pr [url=http://xoomer.alice.it/ddoys/pr/]pr[/url] http://xoomer.alice.it/ddoys/pr/) - [141] [CODE(HTML)[]] (It very interesting experian [url=http://experian.awardspace.biz/experian/]experian[/url] http://experian.awardspace.biz/experian/) - [142] [CODE(HTML)[]] (Hi, nice site! consolidation [url=http://cons.awardspace.biz/consolidation/]consolidation[/url] http://cons.awardspace.biz/consolidation/) - [143] [CODE(HTML)[]] (Very nice site! steroid [url=http://ster.awardspace.biz/steroid/]steroid[/url] http://ster.awardspace.biz/steroid/) - [144] [CODE(HTML)[]] (Good Luck! anti [url=http://xoomer.alice.it/scukona/anti/]anti[/url] http://xoomer.alice.it/scukona/anti/) - [145] [CODE(HTML)[]] (Very nice site! bachelor degree [url=http://xoomer.alice.it/jopa/bachelor-degree/]bachelor degree[/url] http://xoomer.alice.it/jopa/bachelor-degree/) - [146] [CODE(HTML)[]] (this site rocks! download music [url=http://xoomer.alice.it/jopa/download-music/]download music[/url] http://xoomer.alice.it/jopa/download-music/) - [147] [CODE(HTML)[]] (this site rocks! download music [url=http://xoomer.alice.it/jopa/download-music/]download music[/url] http://xoomer.alice.it/jopa/download-music/) - [148] [CODE(HTML)[]] (thanks for mentioning http://nlp.awardspace.co.uk/cartridge-inkjet/ ) - [149] [CODE(HTML)[]] (Very nice site http://xoomer.alice.it/jopa/anti-virus/ ) - [151] [CODE(HTML)[]] (Good Luck! http://xoomer.alice.it/fe7/texas-holdem-poker-table/ ) [[#form:'%text(label=>値,size=>10,id=>value); %text(label=>参考,size=>20,id=>comment);':'-[%index;] [CODE(HTML)[%text(source=>value);]]%text(prefix=>" (",suffix=>")",source=>comment);']] * 例 [49] 使用例 [SRC[RFC 1866 5.2.5]] [PRE(HTML)[ ]PRE] これから生成した HTTP 応答の頭欄の例 [SRC[RFC 1866 5.2.5]] [PRE(HTTP)[ Expires: Tue, 04 Dec 1993 21:29:02 GMT Keywords: Fred, Barney Reply-to: fielding@ics.uci.edu (Roy Fielding) ]PRE] [[#comment]] * メモ - [7] >>1 ''HTML META for Creating HTTP Headers - HTML Code Tutorial'' は [CODE(HTTP)[Author:]] 欄が HTTP にあると断言してるんだが、歴史的に実在してるんだろうか? [21] [CODE(HTTP)[Author]] の例と [CODE(HTTP)[Keywords]] の例を metatag I-D で発見。後者はニュースの [CODE(822)[[[Keywords]]:]] との絡みもあるし、更なる調査が必要の予感 [22] にしても、現代では [CODE(HTMLa)[[[name]]]] と [CODE(HTMLa)[http-equiv]] ははっきり区別されている (大昔はそうではなかったが)。それなのに両者の違いが分からず適当に使ってる香具師が多いこと。 [23] [[XHTML 2.0]] ではぜひとも古き時代の遺物 [CODE(HTMLa)[http-equiv]] は削除して欲しいね。 [[HTTP]] [[header]] まで著者がいじれて当然の世界にとっとなって欲しい。 [24] >>2 謎のブラウザ新機能の制御のためになぜか [CODE(HTMLa)[http-equiv]] 使う [[M$]] も何とかして下さい。香具師のおかげで意味不明な [[HTTP]] header (例: [CODE(HTTP)[[[MSThemeCompatible]]:]] 欄) がどれだけ増えたか。 [55] [[WMLScript]] は [CODE[meta http equiv]] [[pragma]] を規定しています。 ([[名無しさん]] [sage]) [56] [[WML]] の [CODE(XMLe)[[[meta]]]] 要素にも [CODE(XMLa)[http-equiv]] 属性があります。 ([[名無しさん]] [sage]) [57] [[SSML]] の [CODE(XMLe)[[[meta]]]] 要素にも [CODE(XMLa)[http-equiv]] 属性があります。 ([[名無しさん]] [sage]) [58] [[SRGS]] の XML 形の [CODE(XMLe)[[[meta]]]] 要素にも [CODE(XMLa)[http-equiv]] があります。 [[ABNF]] 形にも [CODE[http-equiv]] 鍵語があります。この仕様書の使用例には例によってあの間違った構文の [CODE(HTTP)[[[Expires]]]] 欄を [CODE(XMLa)[http-equiv]] で使っているのが載っています。こうやっておかしなものが拡大再生産されているのは怖いなあ。 ([[名無しさん]] [sage]) [59] [[CCXML 1.0]] の [CODE(XMLe)[[[meta]]]] 要素にも [CODE(HTMLa)[[[http-equiv]]]] 属性があります。 [CITE[Voice Browser Call Control: CCXML Version 1.0]] ([[名無しさん]] [sage] [WEAK[2005-06-29 23:19:14 +00:00]]) [63] [CITE[Pronunciation Lexicon Specification (PLS) Version 1.0]] ([[名無しさん]] [sage]) [65] [CITE[Webページ用の、正規HTML記述法]] (2003年9月付) > [PRE(HTML example code)[ ]PRE] > この記述の意味は、「httpプロトコルで扱うコンテントのタイプは、HTMLというテキストファイルで、“Shift_JIS”文字セットで記述されている」というもので、''シフトJIS の指定ですが、殆どのパソコンはこれでいいでしょう''。捏造乙。 ([[名無しさん]]) [[#comment]] * [CODE(HTMLa)[http-equiv]] Considered Harmful [52] [CODE(HTMLa)[http-equiv]] 属性を使った [CODE(HTMLe)[meta]] 要素によって HTML 文書に HTTP 頭欄の元となる情報を用意しておくことは、手軽であり、元々はそう悪い考えではありませんでした。しかし、実際にはこの方法はほとんど成功しなかったどころか、一部では誤った方向で使われています。 [CODE(HTMLa)[http-equiv]] は歴史的遺物であり、 '''使用するべきではありません'''。 [53] とかいうことを書こうと思って、どうせもう書いている人がいるだろうとも思って検索してみたら、ありました。 [CITE[Robots Mailing List Archive: Re: HEAD request [was Re: Server name in /robots.txt]]] こちらの文書は [[HTML 2.0]] ができる当時のもので、まだ [CODE(HTMLa)[http-equiv]] が正しく機能する望みがいくらかはあった時のものです。ですからあまり深刻ではありません。 [54] 現代版 Considered Harmful の骨子: - [CODE(HTML)[http-equiv=Content-Type]] は箱の中の鍵、一時しのぎ → 既に必要性は低下している - UA が解釈するのが当然とみなされている (仕様がそもそもおかしい、ものによって UA が解釈したりしなかったり) - HTTP との整合性 (標準化の動きすらない頭欄が使われている、複数の指定があるときの扱い、 HTTP が使われていない時の扱い、指定できるべきではない頭欄の扱い、使用できる文字の種類)