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Changeset 1240 for draft-ietf-httpbis/latest/p3-payload.html
- Timestamp:
- 30/03/11 14:03:49 (11 years ago)
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- 1 edited
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draft-ietf-httpbis/latest/p3-payload.html (modified) (10 diffs)
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draft-ietf-httpbis/latest/p3-payload.html
r1234 r1240 546 546 </li> 547 547 <li>2. <a href="#protocol.parameters">Protocol Parameters</a><ul> 548 <li>2.1 <a href="#character.sets">Character Encodings (charset)</a><ul> 549 <li>2.1.1 <a href="#missing.charset">Missing Charset</a></li> 550 </ul> 551 </li> 548 <li>2.1 <a href="#character.sets">Character Encodings (charset)</a></li> 552 549 <li>2.2 <a href="#content.codings">Content Codings</a><ul> 553 550 <li>2.2.1 <a href="#content.coding.registry">Content Coding Registry</a></li> … … 703 700 <p id="rfc.section.2.1.p.6">Implementors need to be aware of IETF character set requirements <a href="#RFC3629" id="rfc.xref.RFC3629.1"><cite title="UTF-8, a transformation format of ISO 10646">[RFC3629]</cite></a> <a href="#RFC2277" id="rfc.xref.RFC2277.1"><cite title="IETF Policy on Character Sets and Languages">[RFC2277]</cite></a>. 704 701 </p> 705 <h3 id="rfc.section.2.1.1"><a href="#rfc.section.2.1.1">2.1.1</a> <a id="missing.charset" href="#missing.charset">Missing Charset</a></h3>706 <p id="rfc.section.2.1.1.p.1">Some HTTP/1.0 software has interpreted a Content-Type header field without charset parameter incorrectly to mean "recipient707 should guess". Senders wishing to defeat this behavior <em class="bcp14">MAY</em> include a charset parameter even when the charset is ISO-8859-1 (<a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.1"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a>) and <em class="bcp14">SHOULD</em> do so when it is known that it will not confuse the recipient.708 </p>709 <p id="rfc.section.2.1.1.p.2">Unfortunately, some older HTTP/1.0 clients did not deal properly with an explicit charset parameter. HTTP/1.1 recipients <em class="bcp14">MUST</em> respect the charset label provided by the sender; and those user agents that have a provision to "guess" a charset <em class="bcp14">MUST</em> use the charset from the content-type field if they support that charset, rather than the recipient's preference, when initially710 displaying a document. See <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section 2.3.1</a>.711 </p>712 702 <h2 id="rfc.section.2.2"><a href="#rfc.section.2.2">2.2</a> <a id="content.codings" href="#content.codings">Content Codings</a></h2> 713 703 <p id="rfc.section.2.2.p.1">Content coding values indicate an encoding transformation that has been or can be applied to a representation. Content codings … … 798 788 <p id="rfc.section.2.3.1.p.3">If a representation is encoded with a content-coding, the underlying data <em class="bcp14">MUST</em> be in a form defined above prior to being encoded. 799 789 </p> 800 <p id="rfc.section.2.3.1.p.4">The "charset" parameter is used with some media types to define the character encoding (<a href="#character.sets" title="Character Encodings (charset)">Section 2.1</a>) of the data. When no explicit charset parameter is provided by the sender, media subtypes of the "text" type are defined801 to have a default charset value of "ISO-8859-1" when received via HTTP. Data in character encodings other than "ISO-8859-1"802 or its subsets <em class="bcp14">MUST</em> be labeled with an appropriate charset value. See <a href="#missing.charset" title="Missing Charset">Section 2.1.1</a> for compatibility problems.803 </p>804 790 <h3 id="rfc.section.2.3.2"><a href="#rfc.section.2.3.2">2.3.2</a> <a id="multipart.types" href="#multipart.types">Multipart Types</a></h3> 805 791 <p id="rfc.section.2.3.2.p.1">MIME provides for a number of "multipart" types — encapsulations of one or more representations within a single message-body. … … 1148 1134 </p> 1149 1135 <div id="rfc.figure.u.16"></div><pre class="text"> Accept-Charset: iso-8859-5, unicode-1-1;q=0.8 1150 </pre><p id="rfc.section.6.2.p.5">The special value "*", if present in the Accept-Charset field, matches every character encoding (including ISO-8859-1) which 1151 is not mentioned elsewhere in the Accept-Charset field. If no "*" is present in an Accept-Charset field, then all character 1152 encodings not explicitly mentioned get a quality value of 0, except for ISO-8859-1, which gets a quality value of 1 if not 1153 explicitly mentioned. 1136 </pre><p id="rfc.section.6.2.p.5">The special value "*", if present in the Accept-Charset field, matches every character encoding which is not mentioned elsewhere 1137 in the Accept-Charset field. If no "*" is present in an Accept-Charset field, then all character encodings not explicitly 1138 mentioned get a quality value of 0. 1154 1139 </p> 1155 1140 <p id="rfc.section.6.2.p.6">If no Accept-Charset header field is present, the default is that any character encoding is acceptable. If an Accept-Charset … … 1538 1523 <h2 id="rfc.references.1"><a href="#rfc.section.10.1" id="rfc.section.10.1">10.1</a> Normative References 1539 1524 </h2> 1540 <table> 1541 <tr> 1542 <td class="reference"><b id="ISO-8859-1">[ISO-8859-1]</b></td> 1543 <td class="top">International Organization for Standardization, “Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1”, ISO/IEC 8859-1:1998, 1998.</td> 1544 </tr> 1525 <table> 1545 1526 <tr> 1546 1527 <td class="reference"><b id="Part1">[Part1]</b></td> … … 1787 1768 <p id="rfc.section.C.p.1">Clarify contexts that charset is used in. (<a href="#character.sets" title="Character Encodings (charset)">Section 2.1</a>) 1788 1769 </p> 1789 <p id="rfc.section.C.p.2">Change ABNF productions for header fields to only define the field value. (<a href="#header.fields" title="Header Field Definitions">Section 6</a>) 1790 </p> 1791 <p id="rfc.section.C.p.3">Remove base URI setting semantics for Content-Location due to poor implementation support, which was caused by too many broken 1770 <p id="rfc.section.C.p.2">Remove the default character encoding for text media types; the default now is whatever the media type definition says. (<a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section 2.3.1</a>) 1771 </p> 1772 <p id="rfc.section.C.p.3">Change ABNF productions for header fields to only define the field value. (<a href="#header.fields" title="Header Field Definitions">Section 6</a>) 1773 </p> 1774 <p id="rfc.section.C.p.4">Remove ISO-8859-1 special-casing in Accept-Charset. (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.3" title="Accept-Charset">Section 6.2</a>) 1775 </p> 1776 <p id="rfc.section.C.p.5">Remove base URI setting semantics for Content-Location due to poor implementation support, which was caused by too many broken 1792 1777 servers emitting bogus Content-Location header fields, and also the potentially undesirable effect of potentially breaking 1793 1778 relative links in content-negotiated resources. (<a href="#header.content-location" id="rfc.xref.header.content-location.3" title="Content-Location">Section 6.7</a>) 1794 1779 </p> 1795 <p id="rfc.section.C.p. 4">Remove reference to non-existant identity transfer-coding value tokens. (<a href="#no.content-transfer-encoding" title="No Content-Transfer-Encoding">Appendix A.5</a>)1780 <p id="rfc.section.C.p.6">Remove reference to non-existant identity transfer-coding value tokens. (<a href="#no.content-transfer-encoding" title="No Content-Transfer-Encoding">Appendix A.5</a>) 1796 1781 </p> 1797 1782 <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a> <a id="collected.abnf" href="#collected.abnf">Collected ABNF</a></h1> … … 2056 2041 <p id="rfc.section.E.15.p.1">Closed issues: </p> 2057 2042 <ul> 2043 <li> <<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/20">http://tools.ietf.org/wg/httpbis/trac/ticket/20</a>>: "Default charsets for text media types" 2044 </li> 2058 2045 <li> <<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/276">http://tools.ietf.org/wg/httpbis/trac/ticket/276</a>>: "untangle ABNFs for header fields" 2059 2046 </li> … … 2066 2053 <li><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul> 2067 2054 <li>Accept header field <a href="#rfc.xref.header.accept.1">2.3</a>, <a href="#rfc.xref.header.accept.2">5.1</a>, <a href="#rfc.iref.a.1"><b>6.1</b></a>, <a href="#rfc.xref.header.accept.3">7.1</a></li> 2068 <li>Accept-Charset header field <a href="#rfc.xref.header.accept-charset.1">5.1</a>, <a href="#rfc.iref.a.2"><b>6.2</b></a>, <a href="#rfc.xref.header.accept-charset.2">7.1</a> </li>2055 <li>Accept-Charset header field <a href="#rfc.xref.header.accept-charset.1">5.1</a>, <a href="#rfc.iref.a.2"><b>6.2</b></a>, <a href="#rfc.xref.header.accept-charset.2">7.1</a>, <a href="#rfc.xref.header.accept-charset.3">C</a></li> 2069 2056 <li>Accept-Encoding header field <a href="#rfc.xref.header.accept-encoding.1">2.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.1</a>, <a href="#rfc.iref.a.3"><b>6.3</b></a>, <a href="#rfc.xref.header.accept-encoding.3">7.1</a></li> 2070 2057 <li>Accept-Language header field <a href="#rfc.xref.header.accept-language.1">5.1</a>, <a href="#rfc.iref.a.4"><b>6.4</b></a>, <a href="#rfc.xref.header.accept-language.2">7.1</a></li> … … 2133 2120 <ul> 2134 2121 <li>Accept <a href="#rfc.xref.header.accept.1">2.3</a>, <a href="#rfc.xref.header.accept.2">5.1</a>, <a href="#rfc.iref.h.1"><b>6.1</b></a>, <a href="#rfc.xref.header.accept.3">7.1</a></li> 2135 <li>Accept-Charset <a href="#rfc.xref.header.accept-charset.1">5.1</a>, <a href="#rfc.iref.h.2"><b>6.2</b></a>, <a href="#rfc.xref.header.accept-charset.2">7.1</a> </li>2122 <li>Accept-Charset <a href="#rfc.xref.header.accept-charset.1">5.1</a>, <a href="#rfc.iref.h.2"><b>6.2</b></a>, <a href="#rfc.xref.header.accept-charset.2">7.1</a>, <a href="#rfc.xref.header.accept-charset.3">C</a></li> 2136 2123 <li>Accept-Encoding <a href="#rfc.xref.header.accept-encoding.1">2.2</a>, <a href="#rfc.xref.header.accept-encoding.2">5.1</a>, <a href="#rfc.iref.h.3"><b>6.3</b></a>, <a href="#rfc.xref.header.accept-encoding.3">7.1</a></li> 2137 2124 <li>Accept-Language <a href="#rfc.xref.header.accept-language.1">5.1</a>, <a href="#rfc.iref.h.4"><b>6.4</b></a>, <a href="#rfc.xref.header.accept-language.2">7.1</a></li> … … 2148 2135 <li><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul> 2149 2136 <li>identity (Coding Format) <a href="#rfc.iref.i.1">2.2</a></li> 2150 <li><em>ISO-8859-1</em> <a href="#rfc.xref.ISO-8859-1.1">2.1.1</a>, <a href="#ISO-8859-1"><b>10.1</b></a></li>2151 2137 </ul> 2152 2138 </li>
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