Ignore:
Timestamp:
14/06/14 11:20:37 (6 years ago)
Author:
julian.reschke@…
Message:

update to latest version of rfc2629.xslt, regen all HTML

File:
1 edited

Legend:

Unmodified
Added
Removed
  • draft-ietf-httpbis-content-disp/05/draft-ietf-httpbis-content-disp.html

    r1119 r2726  
    22  PUBLIC "-//W3C//DTD HTML 4.01//EN">
    33<html lang="en">
    4    <head profile="http://www.w3.org/2006/03/hcard http://dublincore.org/documents/2008/08/04/dc-html/">
     4   <head profile="http://dublincore.org/documents/2008/08/04/dc-html/">
    55      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    66      <title>Use of the Content-Disposition&nbsp;Header&nbsp;Field
     
    3333body {
    3434  color: black;
    35   font-family: verdana, helvetica, arial, sans-serif;
    36   font-size: 10pt;
     35  font-family: cambria, helvetica, arial, sans-serif;
     36  font-size: 11pt;
     37  margin-right: 2em;
    3738}
    3839cite {
     
    4243  margin-left: 2em;
    4344}
    44 dd {
    45   margin-right: 2em;
    46 }
    4745dl {
    4846  margin-left: 2em;
    4947}
    50 
    5148ul.empty {
    5249  list-style-type: none;
     
    6259}
    6360h1 {
    64   font-size: 14pt;
     61  font-size: 130%;
    6562  line-height: 21pt;
    6663  page-break-after: avoid;
     
    6966  page-break-before: always;
    7067}
    71 h1 a {
    72   color: #333333;
    73 }
    7468h2 {
    75   font-size: 12pt;
     69  font-size: 120%;
    7670  line-height: 15pt;
    7771  page-break-after: avoid;
    7872}
    79 h3, h4, h5, h6 {
    80   font-size: 10pt;
     73h3 {
     74  font-size: 110%;
    8175  page-break-after: avoid;
    8276}
    83 h2 a, h3 a, h4 a, h5 a, h6 a {
     77h4, h5, h6 {
     78  page-break-after: avoid;
     79}
     80h1 a, h2 a, h3 a, h4 a, h5 a, h6 a {
    8481  color: black;
    8582}
     
    8986li {
    9087  margin-left: 2em;
    91   margin-right: 2em;
    9288}
    9389ol {
    9490  margin-left: 2em;
    95   margin-right: 2em;
     91}
     92ol.la {
     93  list-style-type: lower-alpha;
     94}
     95ol.ua {
     96  list-style-type: upper-alpha;
    9697}
    9798ol p {
     
    100101p {
    101102  margin-left: 2em;
    102   margin-right: 2em;
    103103}
    104104pre {
     
    106106  background-color: lightyellow;
    107107  padding: .25em;
     108  page-break-inside: avoid;
    108109}
    109110pre.text2 {
     
    134135table.tt {
    135136  vertical-align: top;
     137  border-color: gray;
     138}
     139table.tt th {
     140  border-color: gray;
     141}
     142table.tt td {
     143  border-color: gray;
     144}
     145table.all {
     146  border-style: solid;
     147  border-width: 2px;
    136148}
    137149table.full {
    138   border-style: outset;
    139   border-width: 1px;
    140 }
    141 table.headers {
    142   border-style: outset;
    143   border-width: 1px;
     150  border-style: solid;
     151  border-width: 2px;
    144152}
    145153table.tt td {
    146154  vertical-align: top;
    147155}
     156table.all td {
     157  border-style: solid;
     158  border-width: 1px;
     159}
    148160table.full td {
    149   border-style: inset;
     161  border-style: none solid;
    150162  border-width: 1px;
    151163}
     
    153165  vertical-align: top;
    154166}
     167table.all th {
     168  border-style: solid;
     169  border-width: 1px;
     170}
    155171table.full th {
    156   border-style: inset;
    157   border-width: 1px;
     172  border-style: solid;
     173  border-width: 1px 1px 2px 1px;
    158174}
    159175table.headers th {
    160   border-style: none none inset none;
    161   border-width: 1px;
     176  border-style: none none solid none;
     177  border-width: 2px;
    162178}
    163179table.left {
     
    174190  caption-side: bottom;
    175191  font-weight: bold;
    176   font-size: 9pt;
     192  font-size: 10pt;
    177193  margin-top: .5em;
    178194}
     
    181197  border-spacing: 1px;
    182198  width: 95%;
    183   font-size: 10pt;
     199  font-size: 11pt;
    184200  color: white;
    185201}
     
    189205td.topnowrap {
    190206  vertical-align: top;
    191   white-space: nowrap; 
     207  white-space: nowrap;
    192208}
    193209table.header td {
     
    209225  list-style: none;
    210226  margin-left: 1.5em;
    211   margin-right: 0em;
    212227  padding-left: 0em;
    213228}
     
    215230  line-height: 150%;
    216231  font-weight: bold;
    217   font-size: 10pt;
    218232  margin-left: 0em;
    219   margin-right: 0em;
    220233}
    221234ul.toc li li {
    222235  line-height: normal;
    223236  font-weight: normal;
    224   font-size: 9pt;
     237  font-size: 10pt;
    225238  margin-left: 0em;
    226   margin-right: 0em;
    227239}
    228240li.excluded {
     
    231243ul p {
    232244  margin-left: 0em;
     245}
     246.title, .filename, h1, h2, h3, h4 {
     247  font-family: candara, helvetica, arial, sans-serif;
     248}
     249samp, tt, code, pre {
     250  font: consolas, monospace;
    233251}
    234252ul.ind, ul.ind ul {
    235253  list-style: none;
    236254  margin-left: 1.5em;
    237   margin-right: 0em;
    238255  padding-left: 0em;
    239256  page-break-before: avoid;
     
    243260  line-height: 200%;
    244261  margin-left: 0em;
    245   margin-right: 0em;
    246262}
    247263ul.ind li li {
     
    249265  line-height: 150%;
    250266  margin-left: 0em;
    251   margin-right: 0em;
    252267}
    253268.avoidbreak {
     
    276291  font-weight: bold;
    277292  text-align: center;
    278   font-size: 9pt;
     293  font-size: 10pt;
    279294}
    280295.filename {
    281296  color: #333333;
     297  font-size: 75%;
    282298  font-weight: bold;
    283   font-size: 12pt;
    284299  line-height: 21pt;
    285300  text-align: center;
     
    288303  font-weight: bold;
    289304}
    290 .hidden {
    291   display: none;
    292 }
    293305.left {
    294306  text-align: left;
     
    298310}
    299311.title {
    300   color: #990000;
    301   font-size: 18pt;
     312  color: green;
     313  font-size: 150%;
    302314  line-height: 18pt;
    303315  font-weight: bold;
     
    305317  margin-top: 36pt;
    306318}
    307 .vcardline {
    308   display: block;
    309 }
    310319.warning {
    311   font-size: 14pt;
     320  font-size: 130%;
    312321  background-color: yellow;
    313322}
     
    318327    display: none;
    319328  }
    320  
     329
    321330  a {
    322331    color: black;
     
    333342    background-color: white;
    334343    vertical-align: top;
    335     font-size: 12pt;
    336   }
    337 
    338   ul.toc a::after {
     344    font-size: 110%;
     345  }
     346
     347  ul.toc a:nth-child(2)::after {
    339348    content: leader('.') target-counter(attr(href), page);
    340349  }
    341  
     350
    342351  ul.ind li li a {
    343352    content: target-counter(attr(href), page);
    344353  }
    345  
     354
    346355  .print2col {
    347356    column-count: 2;
     
    353362@page {
    354363  @top-left {
    355        content: "Internet-Draft"; 
    356   } 
     364       content: "Internet-Draft";
     365  }
    357366  @top-right {
    358        content: "February 2011"; 
    359   } 
     367       content: "February 2011";
     368  }
    360369  @top-center {
    361        content: "Content-Disposition in HTTP"; 
    362   } 
     370       content: "Content-Disposition in HTTP";
     371  }
    363372  @bottom-left {
    364        content: "Reschke"; 
    365   } 
     373       content: "Reschke";
     374  }
    366375  @bottom-center {
    367        content: "Expires August 21, 2011"; 
    368   } 
     376       content: "Expires August 21, 2011";
     377  }
    369378  @bottom-right {
    370        content: "[Page " counter(page) "]"; 
    371   } 
    372 }
    373 
    374 @page:first { 
     379       content: "[Page " counter(page) "]";
     380  }
     381}
     382
     383@page:first {
    375384    @top-left {
    376385      content: normal;
     
    401410      <link rel="Appendix" title="C Alternative Approaches to Internationalization" href="#rfc.section.C">
    402411      <link rel="Appendix" title="D Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.D">
    403       <meta name="generator" content="http://greenbytes.de/tech/webdav/rfc2629.xslt, Revision 1.540, 2011-01-10 09:27:20, XSLT vendor: SAXON 8.9 from Saxonica http://www.saxonica.com/">
     412      <meta name="generator" content="http://greenbytes.de/tech/webdav/rfc2629.xslt, Revision 1.640, 2014/06/13 12:42:58, XSLT vendor: SAXON 8.9 from Saxonica http://www.saxonica.com/">
    404413      <link rel="schema.dct" href="http://purl.org/dc/terms/">
    405414      <meta name="dct.creator" content="Reschke, J. F.">
     
    421430            </tr>
    422431            <tr>
    423                <td class="left">Updates: <a href="http://tools.ietf.org/html/rfc2616">2616</a> (if approved)
     432               <td class="left">Updates: <a href="https://tools.ietf.org/html/rfc2616">2616</a> (if approved)
    424433               </td>
    425434               <td class="right">February 17, 2011</td>
     
    436445      </table>
    437446      <p class="title">Use of the Content-Disposition&nbsp;Header&nbsp;Field in the Hypertext&nbsp;Transfer&nbsp;Protocol&nbsp;(HTTP)<br><span class="filename">draft-ietf-httpbis-content-disp-05</span></p>
    438       <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1> 
     447      <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1>
    439448      <p>HTTP/1.1 defines the Content-Disposition response header field, but points out that it is not part of the HTTP/1.1 Standard.
    440449         This specification takes over the definition and registration of Content-Disposition, as used in HTTP, and clarifies internationalization
    441450         aspects.
    442       </p> 
    443       <h1 id="rfc.note.1"><a href="#rfc.note.1">Editorial Note (To be removed by RFC Editor before publication)</a></h1> 
     451      </p>
     452      <h1 id="rfc.note.1"><a href="#rfc.note.1">Editorial Note (To be removed by RFC Editor before publication)</a></h1>
    444453      <p>This specification is expected to replace the definition of Content-Disposition in the HTTP/1.1 specification, as currently
    445454         revised by the IETF HTTPbis working group. See also &lt;<a href="http://trac.tools.ietf.org/wg/httpbis/trac/ticket/123">http://trac.tools.ietf.org/wg/httpbis/trac/ticket/123</a>&gt;.
    446       </p> 
     455      </p>
    447456      <p>Discussion of this draft should take place on the HTTPBIS working group mailing list (ietf-http-wg@w3.org). The current issues
    448457         list is at &lt;<a href="http://trac.tools.ietf.org/wg/httpbis/trac/query?component=content-disp">http://trac.tools.ietf.org/wg/httpbis/trac/query?component=content-disp</a>&gt; and related documents (including fancy diffs) can be found at &lt;<a href="http://tools.ietf.org/wg/httpbis/">http://tools.ietf.org/wg/httpbis/</a>&gt;.
    449       </p> 
     458      </p>
    450459      <p>The changes in this draft are summarized in <a href="#changes.since.04" title="Since draft-ietf-httpbis-content-disp-04">Appendix&nbsp;D.9</a>.
    451       </p>
    452       <h1><a id="rfc.status" href="#rfc.status">Status of This Memo</a></h1>
    453       <p>This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.</p>
    454       <p>Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute
    455          working documents as Internet-Drafts. The list of current Internet-Drafts is at <a href="http://datatracker.ietf.org/drafts/current/">http://datatracker.ietf.org/drafts/current/</a>.
    456460      </p>
    457       <p>Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other
    458          documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as “work
    459          in progress”.
    460       </p>
    461       <p>This Internet-Draft will expire on August 21, 2011.</p>
    462       <h1><a id="rfc.copyrightnotice" href="#rfc.copyrightnotice">Copyright Notice</a></h1>
    463       <p>Copyright © 2011 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
    464       <p>This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights
    465          and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License
    466          text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified
    467          BSD License.
    468       </p>
     461      <div id="rfc.status">
     462         <h1><a href="#rfc.status">Status of This Memo</a></h1>
     463         <p>This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.</p>
     464         <p>Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute
     465            working documents as Internet-Drafts. The list of current Internet-Drafts is at <a href="http://datatracker.ietf.org/drafts/current/">http://datatracker.ietf.org/drafts/current/</a>.
     466         </p>
     467         <p>Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other
     468            documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as “work
     469            in progress”.
     470         </p>
     471         <p>This Internet-Draft will expire on August 21, 2011.</p>
     472      </div>
     473      <div id="rfc.copyrightnotice">
     474         <h1><a href="#rfc.copyrightnotice">Copyright Notice</a></h1>
     475         <p>Copyright © 2011 IETF Trust and the persons identified as the document authors. All rights reserved.</p>
     476         <p>This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights
     477            and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License
     478            text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified
     479            BSD License.
     480         </p>
     481      </div>
    469482      <hr class="noprint">
    470483      <h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1>
    471484      <ul class="toc">
    472          <li>1.&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a></li>
    473          <li>2.&nbsp;&nbsp;&nbsp;<a href="#notational.conventions">Notational Conventions</a></li>
    474          <li>3.&nbsp;&nbsp;&nbsp;<a href="#conformance.and.error.handling">Conformance and Error Handling</a></li>
    475          <li>4.&nbsp;&nbsp;&nbsp;<a href="#header.field.definition">Header Field Definition</a><ul>
    476                <li>4.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.4.1">Grammar</a></li>
    477                <li>4.2&nbsp;&nbsp;&nbsp;<a href="#disposition.type">Disposition Type</a></li>
    478                <li>4.3&nbsp;&nbsp;&nbsp;<a href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></li>
    479                <li>4.4&nbsp;&nbsp;&nbsp;<a href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></li>
    480                <li>4.5&nbsp;&nbsp;&nbsp;<a href="#extensibility">Extensibility</a></li>
     485         <li><a href="#rfc.section.1">1.</a>&nbsp;&nbsp;&nbsp;<a href="#introduction">Introduction</a></li>
     486         <li><a href="#rfc.section.2">2.</a>&nbsp;&nbsp;&nbsp;<a href="#notational.conventions">Notational Conventions</a></li>
     487         <li><a href="#rfc.section.3">3.</a>&nbsp;&nbsp;&nbsp;<a href="#conformance.and.error.handling">Conformance and Error Handling</a></li>
     488         <li><a href="#rfc.section.4">4.</a>&nbsp;&nbsp;&nbsp;<a href="#header.field.definition">Header Field Definition</a><ul>
     489               <li><a href="#rfc.section.4.1">4.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.4.1">Grammar</a></li>
     490               <li><a href="#rfc.section.4.2">4.2</a>&nbsp;&nbsp;&nbsp;<a href="#disposition.type">Disposition Type</a></li>
     491               <li><a href="#rfc.section.4.3">4.3</a>&nbsp;&nbsp;&nbsp;<a href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></li>
     492               <li><a href="#rfc.section.4.4">4.4</a>&nbsp;&nbsp;&nbsp;<a href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></li>
     493               <li><a href="#rfc.section.4.5">4.5</a>&nbsp;&nbsp;&nbsp;<a href="#extensibility">Extensibility</a></li>
    481494            </ul>
    482495         </li>
    483          <li>5.&nbsp;&nbsp;&nbsp;<a href="#examples">Examples</a></li>
    484          <li>6.&nbsp;&nbsp;&nbsp;<a href="#i18n">Internationalization Considerations</a></li>
    485          <li>7.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
    486          <li>8.&nbsp;&nbsp;&nbsp;<a href="#iana.considerations">IANA Considerations</a><ul>
    487                <li>8.1&nbsp;&nbsp;&nbsp;<a href="#registry">Registry for Disposition Values and Parameter</a></li>
    488                <li>8.2&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
     496         <li><a href="#rfc.section.5">5.</a>&nbsp;&nbsp;&nbsp;<a href="#examples">Examples</a></li>
     497         <li><a href="#rfc.section.6">6.</a>&nbsp;&nbsp;&nbsp;<a href="#i18n">Internationalization Considerations</a></li>
     498         <li><a href="#rfc.section.7">7.</a>&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a></li>
     499         <li><a href="#rfc.section.8">8.</a>&nbsp;&nbsp;&nbsp;<a href="#iana.considerations">IANA Considerations</a><ul>
     500               <li><a href="#rfc.section.8.1">8.1</a>&nbsp;&nbsp;&nbsp;<a href="#registry">Registry for Disposition Values and Parameter</a></li>
     501               <li><a href="#rfc.section.8.2">8.2</a>&nbsp;&nbsp;&nbsp;<a href="#header.field.registration">Header Field Registration</a></li>
    489502            </ul>
    490503         </li>
    491          <li>9.&nbsp;&nbsp;&nbsp;<a href="#rfc.section.9">Acknowledgements</a></li>
    492          <li>10.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
    493                <li>10.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    494                <li>10.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     504         <li><a href="#rfc.section.9">9.</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.9">Acknowledgements</a></li>
     505         <li><a href="#rfc.section.10">10.</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul>
     506               <li><a href="#rfc.section.10.1">10.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     507               <li><a href="#rfc.section.10.2">10.2</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    495508            </ul>
    496509         </li>
    497          <li><a href="#rfc.authors">Author's Address</a></li>
    498          <li>A.&nbsp;&nbsp;&nbsp;<a href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></li>
    499          <li>B.&nbsp;&nbsp;&nbsp;<a href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></li>
    500          <li>C.&nbsp;&nbsp;&nbsp;<a href="#alternatives">Alternative Approaches to Internationalization</a><ul>
    501                <li>C.1&nbsp;&nbsp;&nbsp;<a href="#alternatives.rfc2047">RFC 2047 Encoding</a></li>
    502                <li>C.2&nbsp;&nbsp;&nbsp;<a href="#alternatives.percent">Percent Encoding</a></li>
    503                <li>C.3&nbsp;&nbsp;&nbsp;<a href="#alternatives.sniff">Encoding Sniffing</a></li>
    504                <li>C.4&nbsp;&nbsp;&nbsp;<a href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></li>
     510         <li><a href="#rfc.section.A">A.</a>&nbsp;&nbsp;&nbsp;<a href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></li>
     511         <li><a href="#rfc.section.B">B.</a>&nbsp;&nbsp;&nbsp;<a href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></li>
     512         <li><a href="#rfc.section.C">C.</a>&nbsp;&nbsp;&nbsp;<a href="#alternatives">Alternative Approaches to Internationalization</a><ul>
     513               <li><a href="#rfc.section.C.1">C.1</a>&nbsp;&nbsp;&nbsp;<a href="#alternatives.rfc2047">RFC 2047 Encoding</a></li>
     514               <li><a href="#rfc.section.C.2">C.2</a>&nbsp;&nbsp;&nbsp;<a href="#alternatives.percent">Percent Encoding</a></li>
     515               <li><a href="#rfc.section.C.3">C.3</a>&nbsp;&nbsp;&nbsp;<a href="#alternatives.sniff">Encoding Sniffing</a></li>
     516               <li><a href="#rfc.section.C.4">C.4</a>&nbsp;&nbsp;&nbsp;<a href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></li>
    505517            </ul>
    506518         </li>
    507          <li>D.&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul>
    508                <li>D.1&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.1">Since draft-reschke-rfc2183-in-http-00</a></li>
    509                <li>D.2&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.2">Since draft-reschke-rfc2183-in-http-01</a></li>
    510                <li>D.3&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.3">Since draft-reschke-rfc2183-in-http-02</a></li>
    511                <li>D.4&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.4">Since draft-reschke-rfc2183-in-http-03</a></li>
    512                <li>D.5&nbsp;&nbsp;&nbsp;<a href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></li>
    513                <li>D.6&nbsp;&nbsp;&nbsp;<a href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></li>
    514                <li>D.7&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></li>
    515                <li>D.8&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></li>
    516                <li>D.9&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></li>
     519         <li><a href="#rfc.section.D">D.</a>&nbsp;&nbsp;&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul>
     520               <li><a href="#rfc.section.D.1">D.1</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.1">Since draft-reschke-rfc2183-in-http-00</a></li>
     521               <li><a href="#rfc.section.D.2">D.2</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.2">Since draft-reschke-rfc2183-in-http-01</a></li>
     522               <li><a href="#rfc.section.D.3">D.3</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.3">Since draft-reschke-rfc2183-in-http-02</a></li>
     523               <li><a href="#rfc.section.D.4">D.4</a>&nbsp;&nbsp;&nbsp;<a href="#rfc.section.D.4">Since draft-reschke-rfc2183-in-http-03</a></li>
     524               <li><a href="#rfc.section.D.5">D.5</a>&nbsp;&nbsp;&nbsp;<a href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></li>
     525               <li><a href="#rfc.section.D.6">D.6</a>&nbsp;&nbsp;&nbsp;<a href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></li>
     526               <li><a href="#rfc.section.D.7">D.7</a>&nbsp;&nbsp;&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></li>
     527               <li><a href="#rfc.section.D.8">D.8</a>&nbsp;&nbsp;&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></li>
     528               <li><a href="#rfc.section.D.9">D.9</a>&nbsp;&nbsp;&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></li>
    517529            </ul>
    518530         </li>
    519531         <li><a href="#rfc.index">Index</a></li>
     532         <li><a href="#rfc.authors">Author's Address</a></li>
    520533      </ul>
    521       <h1 id="rfc.section.1" class="np"><a href="#rfc.section.1">1.</a>&nbsp;<a id="introduction" href="#introduction">Introduction</a></h1>
    522       <p id="rfc.section.1.p.1">HTTP/1.1 defines the Content-Disposition response header field in <a href="http://tools.ietf.org/html/rfc2616#section-19.5.1">Section 19.5.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, but points out that it is not part of the HTTP/1.1 Standard (<a href="http://tools.ietf.org/html/rfc2616#section-15.5" id="rfc.xref.RFC2616.2">Section 15.5</a>):
    523       </p>
    524       <blockquote id="rfc.section.1.p.2" cite="http://tools.ietf.org/html/rfc2616#section-15.5">
    525          <p>Content-Disposition is not part of the HTTP standard, but since it is widely implemented, we are documenting its use and risks
    526             for implementers.
    527          </p>
    528       </blockquote>
    529       <p id="rfc.section.1.p.3">This specification takes over the definition and registration of Content-Disposition, as used in HTTP. Based on interoperability
    530          testing with existing User Agents, it fully defines a profile of the features defined in the Multipurpose Internet Mail Extensions
    531          (MIME) variant (<a href="#RFC2183" id="rfc.xref.RFC2183.1"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>) of the header field, and also clarifies internationalization aspects.
    532       </p>
    533       <div class="note" id="rfc.section.1.p.4">
    534          <p> <b>Note:</b> this document does not apply to Content-Disposition header fields appearing in message payloads transmitted over HTTP, such
    535             as when using the media type "multipart/form-data" (<a href="#RFC2388" id="rfc.xref.RFC2388.1"><cite title="Returning Values from Forms: multipart/form-data">[RFC2388]</cite></a>).
    536          </p>
    537       </div>
    538       <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="notational.conventions" href="#notational.conventions">Notational Conventions</a></h1>
    539       <p id="rfc.section.2.p.1">The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL"
    540          in this document are to be interpreted as described in <a href="#RFC2119" id="rfc.xref.RFC2119.1"><cite title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</cite></a>.
    541       </p>
    542       <p id="rfc.section.2.p.2">This specification uses the augmented BNF notation defined in <a href="http://tools.ietf.org/html/rfc2616#section-2.1">Section 2.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.3"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, including its rules for implied linear whitespace (LWS).
    543       </p>
    544       <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="conformance.and.error.handling" href="#conformance.and.error.handling">Conformance and Error Handling</a></h1>
    545       <p id="rfc.section.3.p.1">This specification defines conformance criteria for both senders (usually, HTTP origin servers) and recipients (usually, HTTP
    546          user agents) of the Content-Location header field. An implementation is considered conformant if it complies with all of the
    547          requirements associated with its role.
    548       </p>
    549       <p id="rfc.section.3.p.2">This specification also defines certain forms of the header field-value to be invalid, using both ABNF and prose requirements,
    550          but it does not define special handling of these invalid field-values.
    551       </p>
    552       <p id="rfc.section.3.p.3">Sending implementations <em class="bcp14">MUST NOT</em> generate Content-Location header fields that are invalid.
    553       </p>
    554       <p id="rfc.section.3.p.4">Consuming implementations <em class="bcp14">MAY</em> take steps to recover a usable field-value from an invalid header field, but <em class="bcp14">SHOULD NOT</em> reject the message outright, unless this is explicitly desirable behaviour (e.g., the implementation is a validator). As such,
    555          the default handling of invalid fields is to ignore them.
    556       </p>
    557       <div id="rfc.iref.h.1"></div>
    558       <div id="rfc.iref.c.1"></div>
    559       <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="header.field.definition" href="#header.field.definition">Header Field Definition</a></h1>
    560       <p id="rfc.section.4.p.1">The Content-Disposition response header field is used to convey additional information about how to process the response payload,
    561          and also can be used to attach additional metadata, such as the filename to use when saving the response payload locally.
    562       </p>
    563       <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;Grammar
    564       </h2>
    565       <div id="rfc.figure.u.1"></div><pre class="inline">  content-disposition = "Content-Disposition" ":"
     534      <div id="introduction">
     535         <h1 id="rfc.section.1" class="np"><a href="#rfc.section.1">1.</a>&nbsp;<a href="#introduction">Introduction</a></h1>
     536         <p id="rfc.section.1.p.1">HTTP/1.1 defines the Content-Disposition response header field in <a href="https://tools.ietf.org/html/rfc2616#section-19.5.1">Section 19.5.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, but points out that it is not part of the HTTP/1.1 Standard (<a href="https://tools.ietf.org/html/rfc2616#section-15.5" id="rfc.xref.RFC2616.2">Section 15.5</a>):
     537         </p>
     538         <blockquote id="rfc.section.1.p.2" cite="http://tools.ietf.org/html/rfc2616#section-15.5">
     539            <p>Content-Disposition is not part of the HTTP standard, but since it is widely implemented, we are documenting its use and risks
     540               for implementers.
     541            </p>
     542         </blockquote>
     543         <p id="rfc.section.1.p.3">This specification takes over the definition and registration of Content-Disposition, as used in HTTP. Based on interoperability
     544            testing with existing User Agents, it fully defines a profile of the features defined in the Multipurpose Internet Mail Extensions
     545            (MIME) variant (<a href="#RFC2183" id="rfc.xref.RFC2183.1"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>) of the header field, and also clarifies internationalization aspects.
     546         </p>
     547         <div class="note" id="rfc.section.1.p.4">
     548            <p><b>Note:</b> this document does not apply to Content-Disposition header fields appearing in message payloads transmitted over HTTP, such
     549               as when using the media type "multipart/form-data" (<a href="#RFC2388" id="rfc.xref.RFC2388.1"><cite title="Returning Values from Forms: multipart/form-data">[RFC2388]</cite></a>).
     550            </p>
     551         </div>
     552      </div>
     553      <div id="notational.conventions">
     554         <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a href="#notational.conventions">Notational Conventions</a></h1>
     555         <p id="rfc.section.2.p.1">The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL"
     556            in this document are to be interpreted as described in <a href="#RFC2119" id="rfc.xref.RFC2119.1"><cite title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</cite></a>.
     557         </p>
     558         <p id="rfc.section.2.p.2">This specification uses the augmented BNF notation defined in <a href="https://tools.ietf.org/html/rfc2616#section-2.1">Section 2.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.3"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, including its rules for implied linear whitespace (LWS).
     559         </p>
     560      </div>
     561      <div id="conformance.and.error.handling">
     562         <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a href="#conformance.and.error.handling">Conformance and Error Handling</a></h1>
     563         <p id="rfc.section.3.p.1">This specification defines conformance criteria for both senders (usually, HTTP origin servers) and recipients (usually, HTTP
     564            user agents) of the Content-Location header field. An implementation is considered conformant if it complies with all of the
     565            requirements associated with its role.
     566         </p>
     567         <p id="rfc.section.3.p.2">This specification also defines certain forms of the header field-value to be invalid, using both ABNF and prose requirements,
     568            but it does not define special handling of these invalid field-values.
     569         </p>
     570         <p id="rfc.section.3.p.3">Sending implementations <em class="bcp14">MUST NOT</em> generate Content-Location header fields that are invalid.
     571         </p>
     572         <p id="rfc.section.3.p.4">Consuming implementations <em class="bcp14">MAY</em> take steps to recover a usable field-value from an invalid header field, but <em class="bcp14">SHOULD NOT</em> reject the message outright, unless this is explicitly desirable behaviour (e.g., the implementation is a validator). As such,
     573            the default handling of invalid fields is to ignore them.
     574         </p>
     575      </div>
     576      <div id="header.field.definition">
     577         <div id="rfc.iref.h.1"></div>
     578         <div id="rfc.iref.c.1"></div>
     579         <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a href="#header.field.definition">Header Field Definition</a></h1>
     580         <p id="rfc.section.4.p.1">The Content-Disposition response header field is used to convey additional information about how to process the response payload,
     581            and also can be used to attach additional metadata, such as the filename to use when saving the response payload locally.
     582         </p>
     583         <div>
     584            <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;Grammar
     585            </h2>
     586            <div id="rfc.figure.u.1"></div><pre class="inline">  content-disposition = "Content-Disposition" ":"
    566587                         disposition-type *( ";" disposition-parm )
    567588
     
    578599                      | ext-token "=" ext-value
    579600  ext-token           = &lt;the characters in token, followed by "*"&gt;
    580 </pre><div id="rfc.figure.u.2"></div> 
    581       <p>Defined in <a href="#RFC2616" id="rfc.xref.RFC2616.4"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>:
    582       </p>  <pre class="inline">  token         = &lt;token, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.5"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>&gt;
    583   quoted-string = &lt;quoted-string, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.6"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>&gt;
    584   value         = &lt;value, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.7"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-3.6">Section 3.6</a>&gt;
     601</pre><div id="rfc.figure.u.2"></div>
     602            <p>Defined in <a href="#RFC2616" id="rfc.xref.RFC2616.4"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>:
     603            </p><pre class="inline">  token         = &lt;token, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.5"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="https://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>&gt;
     604  quoted-string = &lt;quoted-string, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.6"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="https://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>&gt;
     605  value         = &lt;value, defined in <a href="#RFC2616" id="rfc.xref.RFC2616.7"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="https://tools.ietf.org/html/rfc2616#section-3.6">Section 3.6</a>&gt;
    585606                ; token | quoted-string
    586607             
    587 </pre><div id="rfc.figure.u.3"></div> 
    588       <p>Defined in <a href="#RFC5987" id="rfc.xref.RFC5987.1"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>:
    589       </p>  <pre class="inline">  ext-value   = &lt;ext-value, defined in <a href="#RFC5987" id="rfc.xref.RFC5987.2"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, <a href="http://tools.ietf.org/html/rfc5987#section-3.2">Section 3.2</a>&gt;
     608</pre><div id="rfc.figure.u.3"></div>
     609            <p>Defined in <a href="#RFC5987" id="rfc.xref.RFC5987.1"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>:
     610            </p><pre class="inline">  ext-value   = &lt;ext-value, defined in <a href="#RFC5987" id="rfc.xref.RFC5987.2"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, <a href="https://tools.ietf.org/html/rfc5987#section-3.2">Section 3.2</a>&gt;
    590611</pre><p id="rfc.section.4.1.p.4">Header field values with multiple instances of the same parameter name are invalid.</p>
    591       <p id="rfc.section.4.1.p.5">Note that due to the rules for implied linear whitespace (<a href="http://tools.ietf.org/html/rfc2616#section-2.1">Section 2.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.8"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>), OPTIONAL whitespace can appear between words (token or quoted-string) and separator characters.
    592       </p>
    593       <p id="rfc.section.4.1.p.6">Furthermore note that the format used for ext-value allows specifying a natural language; this is of limited use for filenames
    594          and is likely to be ignored by recipients.
    595       </p>
    596       <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="disposition.type" href="#disposition.type">Disposition Type</a></h2>
    597       <p id="rfc.section.4.2.p.1">If the disposition type matches "attachment" (case-insensitively), this indicates that the user agent should prompt the user
    598          to save the response locally, rather than process it normally (as per its media type).
    599       </p>
    600       <p id="rfc.section.4.2.p.2">On the other hand, if it matches "inline" (case-insensitively), this implies default processing.</p>
    601       <p id="rfc.section.4.2.p.3">Unknown or unhandled disposition types <em class="bcp14">SHOULD</em> be handled by recipients the same way as "attachment" (see also <a href="#RFC2183" id="rfc.xref.RFC2183.2"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="http://tools.ietf.org/html/rfc2183#section-2.8">Section 2.8</a>).
    602       </p>
    603       <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="disposition.parameter.filename" href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></h2>
    604       <p id="rfc.section.4.3.p.1">The parameters "filename" and "filename*", to be matched case-insensitively, provide information on how to construct a filename
    605          for storing the message payload.
    606       </p>
    607       <p id="rfc.section.4.3.p.2">Depending on the disposition type, this information might be used right away (in the "save as..." interaction caused for the
    608          "attachment" disposition type), or later on (for instance, when the user decides to save the contents of the current page
    609          being displayed).
    610       </p>
    611       <p id="rfc.section.4.3.p.3">The parameters "filename" and "filename*" differ only in that "filename*" uses the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.3"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, allowing the use of characters not present in the ISO-8859-1 character set (<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>).
    612       </p>
    613       <p id="rfc.section.4.3.p.4">Many user agent implementations predating this specification do not understand the "filename*" parameter. Therefore, when
    614          both "filename" and "filename*" are present in a single header field value, recipients <em class="bcp14">SHOULD</em> pick "filename*" and ignore "filename". This way, senders can avoid special-casing specific user agents by sending both the
    615          more expressive "filename*" parameter, and the "filename" parameter as fallback for legacy recipients (see <a href="#examples" title="Examples">Section&nbsp;5</a> for an example).
    616       </p>
    617       <p id="rfc.section.4.3.p.5">It is essential that user agents treat the specified filename as advisory only, thus be very careful in extracting the desired
    618          information. In particular:
    619       </p>
    620       <ul>
    621          <li>
    622             <p>When the value contains path separator characters ("\" or "/"), recipients <em class="bcp14">SHOULD</em> ignore all but the last path segment. This prevents unintentional overwriting of well-known file system locations (such as
    623                "/etc/passwd").
    624             </p>
    625          </li>
    626          <li>
    627             <p>Many platforms do not use Internet Media Types (<a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a>) to hold type information in the file system, but rely on filename extensions instead. Trusting the server-provided file
    628                extension could introduce a privilege escalation when the saved file is later opened (consider ".exe"). Thus, recipients need
    629                to ensure that a file extension is used that is safe, optimally matching the media type of the received payload.
    630             </p>
    631          </li>
    632          <li>
    633             <p>Recipients are advised to strip or replace character sequences that are known to cause confusion both in user interfaces and
    634                in filenames, such as control characters and leading and trailing whitespace.
    635             </p>
    636          </li>
    637          <li>
    638             <p>Other aspects recipients need to be aware of are names that have a special meaning in the file system or in shell commands,
    639                such as "." and "..", "~", "|", and also device names.
    640             </p>
    641          </li>
    642       </ul>
    643       <div class="note" id="rfc.section.4.3.p.6">
    644          <p> <b>Note:</b> Many user agents do not properly handle escape characters when using the quoted-string form. Furthermore, some user agents
    645             erroneously try to perform unescaping of "percent" escapes (see <a href="#alternatives.percent" title="Percent Encoding">Appendix&nbsp;C.2</a>), and thus might misinterpret filenames containing the percent character followed by two hex digits.
    646          </p>
    647       </div>
    648       <h2 id="rfc.section.4.4"><a href="#rfc.section.4.4">4.4</a>&nbsp;<a id="disposition.parameter.extensions" href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></h2>
    649       <p id="rfc.section.4.4.p.1">To enable future extensions, recipients <em class="bcp14">SHOULD</em> ignore unrecognized parameters (see also <a href="#RFC2183" id="rfc.xref.RFC2183.3"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="http://tools.ietf.org/html/rfc2183#section-2.8">Section 2.8</a>).
    650       </p>
    651       <h2 id="rfc.section.4.5"><a href="#rfc.section.4.5">4.5</a>&nbsp;<a id="extensibility" href="#extensibility">Extensibility</a></h2>
    652       <p id="rfc.section.4.5.p.1">Note that <a href="http://tools.ietf.org/html/rfc2183#section-9">Section 9</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.4"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a> defines IANA registries both for disposition types and disposition parameters. This registry is shared by different protocols
    653          using Content-Disposition, such as MIME and HTTP. Therefore, not all registered values may make sense in the context of HTTP.
    654       </p>
    655       <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="examples" href="#examples">Examples</a></h1>
    656       <div id="rfc.figure.u.4"></div>
    657       <p>Direct UA to show "save as" dialog, with a filename of "example.html":</p>  <pre class="text">Content-Disposition: Attachment; filename=example.html
    658 </pre><div id="rfc.figure.u.5"></div>
    659       <p>Direct UA to behave as if the Content-Disposition header field wasn't present, but to remember the filename "an example.html"
    660          for a subsequent save operation:
    661       </p>  <pre class="text">Content-Disposition: INLINE; FILENAME= "an example.html"
    662 </pre>  <p>Note: this uses the quoted-string form so that the space character can be included.</p>
    663       <div id="rfc.figure.u.6"></div>
    664       <p>Direct UA to show "save as" dialog, with a filename containing the Unicode character U+20AC (EURO SIGN):</p>  <pre class="text">Content-Disposition: attachment;
     612            <p id="rfc.section.4.1.p.5">Note that due to the rules for implied linear whitespace (<a href="https://tools.ietf.org/html/rfc2616#section-2.1">Section 2.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.8"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>), OPTIONAL whitespace can appear between words (token or quoted-string) and separator characters.
     613            </p>
     614            <p id="rfc.section.4.1.p.6">Furthermore note that the format used for ext-value allows specifying a natural language; this is of limited use for filenames
     615               and is likely to be ignored by recipients.
     616            </p>
     617         </div>
     618         <div id="disposition.type">
     619            <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a href="#disposition.type">Disposition Type</a></h2>
     620            <p id="rfc.section.4.2.p.1">If the disposition type matches "attachment" (case-insensitively), this indicates that the user agent should prompt the user
     621               to save the response locally, rather than process it normally (as per its media type).
     622            </p>
     623            <p id="rfc.section.4.2.p.2">On the other hand, if it matches "inline" (case-insensitively), this implies default processing.</p>
     624            <p id="rfc.section.4.2.p.3">Unknown or unhandled disposition types <em class="bcp14">SHOULD</em> be handled by recipients the same way as "attachment" (see also <a href="#RFC2183" id="rfc.xref.RFC2183.2"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="https://tools.ietf.org/html/rfc2183#section-2.8">Section 2.8</a>).
     625            </p>
     626         </div>
     627         <div id="disposition.parameter.filename">
     628            <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></h2>
     629            <p id="rfc.section.4.3.p.1">The parameters "filename" and "filename*", to be matched case-insensitively, provide information on how to construct a filename
     630               for storing the message payload.
     631            </p>
     632            <p id="rfc.section.4.3.p.2">Depending on the disposition type, this information might be used right away (in the "save as..." interaction caused for the
     633               "attachment" disposition type), or later on (for instance, when the user decides to save the contents of the current page
     634               being displayed).
     635            </p>
     636            <p id="rfc.section.4.3.p.3">The parameters "filename" and "filename*" differ only in that "filename*" uses the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.3"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, allowing the use of characters not present in the ISO-8859-1 character set (<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>).
     637            </p>
     638            <p id="rfc.section.4.3.p.4">Many user agent implementations predating this specification do not understand the "filename*" parameter. Therefore, when
     639               both "filename" and "filename*" are present in a single header field value, recipients <em class="bcp14">SHOULD</em> pick "filename*" and ignore "filename". This way, senders can avoid special-casing specific user agents by sending both the
     640               more expressive "filename*" parameter, and the "filename" parameter as fallback for legacy recipients (see <a href="#examples" title="Examples">Section&nbsp;5</a> for an example).
     641            </p>
     642            <p id="rfc.section.4.3.p.5">It is essential that user agents treat the specified filename as advisory only, thus be very careful in extracting the desired
     643               information. In particular:
     644            </p>
     645            <ul>
     646               <li>
     647                  <p>When the value contains path separator characters ("\" or "/"), recipients <em class="bcp14">SHOULD</em> ignore all but the last path segment. This prevents unintentional overwriting of well-known file system locations (such as
     648                     "/etc/passwd").
     649                  </p>
     650               </li>
     651               <li>
     652                  <p>Many platforms do not use Internet Media Types (<a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a>) to hold type information in the file system, but rely on filename extensions instead. Trusting the server-provided file
     653                     extension could introduce a privilege escalation when the saved file is later opened (consider ".exe"). Thus, recipients need
     654                     to ensure that a file extension is used that is safe, optimally matching the media type of the received payload.
     655                  </p>
     656               </li>
     657               <li>
     658                  <p>Recipients are advised to strip or replace character sequences that are known to cause confusion both in user interfaces and
     659                     in filenames, such as control characters and leading and trailing whitespace.
     660                  </p>
     661               </li>
     662               <li>
     663                  <p>Other aspects recipients need to be aware of are names that have a special meaning in the file system or in shell commands,
     664                     such as "." and "..", "~", "|", and also device names.
     665                  </p>
     666               </li>
     667            </ul>
     668            <div class="note" id="rfc.section.4.3.p.6">
     669               <p><b>Note:</b> Many user agents do not properly handle escape characters when using the quoted-string form. Furthermore, some user agents
     670                  erroneously try to perform unescaping of "percent" escapes (see <a href="#alternatives.percent" title="Percent Encoding">Appendix&nbsp;C.2</a>), and thus might misinterpret filenames containing the percent character followed by two hex digits.
     671               </p>
     672            </div>
     673         </div>
     674         <div id="disposition.parameter.extensions">
     675            <h2 id="rfc.section.4.4"><a href="#rfc.section.4.4">4.4</a>&nbsp;<a href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></h2>
     676            <p id="rfc.section.4.4.p.1">To enable future extensions, recipients <em class="bcp14">SHOULD</em> ignore unrecognized parameters (see also <a href="#RFC2183" id="rfc.xref.RFC2183.3"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="https://tools.ietf.org/html/rfc2183#section-2.8">Section 2.8</a>).
     677            </p>
     678         </div>
     679         <div id="extensibility">
     680            <h2 id="rfc.section.4.5"><a href="#rfc.section.4.5">4.5</a>&nbsp;<a href="#extensibility">Extensibility</a></h2>
     681            <p id="rfc.section.4.5.p.1">Note that <a href="https://tools.ietf.org/html/rfc2183#section-9">Section 9</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.4"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a> defines IANA registries both for disposition types and disposition parameters. This registry is shared by different protocols
     682               using Content-Disposition, such as MIME and HTTP. Therefore, not all registered values may make sense in the context of HTTP.
     683            </p>
     684         </div>
     685      </div>
     686      <div id="examples">
     687         <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a href="#examples">Examples</a></h1>
     688         <div id="rfc.figure.u.4"></div>
     689         <p>Direct UA to show "save as" dialog, with a filename of "example.html":</p><pre class="text">Content-Disposition: Attachment; filename=example.html
     690</pre><div id="rfc.figure.u.5"></div>
     691         <p>Direct UA to behave as if the Content-Disposition header field wasn't present, but to remember the filename "an example.html"
     692            for a subsequent save operation:
     693         </p><pre class="text">Content-Disposition: INLINE; FILENAME= "an example.html"
     694</pre><p>Note: this uses the quoted-string form so that the space character can be included.</p>
     695         <div id="rfc.figure.u.6"></div>
     696         <p>Direct UA to show "save as" dialog, with a filename containing the Unicode character U+20AC (EURO SIGN):</p><pre class="text">Content-Disposition: attachment;
    665697                     filename*= UTF-8''<b>%e2%82%ac</b>%20rates
    666 </pre>  <p>Here, the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.4"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a> is also used to encode the non-ISO-8859-1 character.
    667       </p>
    668       <div id="rfc.figure.u.7"></div>
    669       <p>Same as above, but adding the "filename" parameter for compatibility with user agents not implementing RFC 5987:</p>  <pre class="text">Content-Disposition: attachment;
     698</pre><p>Here, the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.4"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a> is also used to encode the non-ISO-8859-1 character.
     699         </p>
     700         <div id="rfc.figure.u.7"></div>
     701         <p>Same as above, but adding the "filename" parameter for compatibility with user agents not implementing RFC 5987:</p><pre class="text">Content-Disposition: attachment;
    670702                     filename="EURO rates";
    671703                     filename*=utf-8''<b>%e2%82%ac</b>%20rates
    672 </pre>  <p>Note: as of February 2011, those user agents that do not support the RFC 5987 encoding ignore "filename*" when it occurs after
    673          "filename". Unfortunately, some user agents that do support RFC 5987 do pick the "filename" rather than the "filename*" parameter
    674          when it occurs first; it is expected that this situation is going to improve soon.
    675       </p>
    676       <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="i18n" href="#i18n">Internationalization Considerations</a></h1>
    677       <p id="rfc.section.6.p.1">The "filename*" parameter (<a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>), using the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.5"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, allows the server to transmit characters outside the ISO-8859-1 character set, and also to optionally specify the language
    678          in use.
    679       </p>
    680       <p id="rfc.section.6.p.2">Future parameters might also require internationalization, in which case the same encoding can be used.</p>
    681       <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
    682       <p id="rfc.section.7.p.1">Using server-supplied information for constructing local filenames introduces many risks. These are summarized in <a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>.
    683       </p>
    684       <p id="rfc.section.7.p.2">Furthermore, implementers also ought to be aware of the Security Considerations applying to HTTP (see <a href="http://tools.ietf.org/html/rfc2616#section-15">Section 15</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.9"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>), and also the parameter encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.6"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a> (see <a href="http://tools.ietf.org/html/rfc5987#section-5" id="rfc.xref.RFC5987.7">Section 5</a>).
    685       </p>
    686       <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="iana.considerations" href="#iana.considerations">IANA Considerations</a></h1>
    687       <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="registry" href="#registry">Registry for Disposition Values and Parameter</a></h2>
    688       <p id="rfc.section.8.1.p.1">This specification does not introduce any changes to the registration procedures for disposition values and parameters that
    689          are defined in <a href="http://tools.ietf.org/html/rfc2183#section-9">Section 9</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.5"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>.
    690       </p>
    691       <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a id="header.field.registration" href="#header.field.registration">Header Field Registration</a></h2>
    692       <p id="rfc.section.8.2.p.1">This document updates the definition of the Content-Disposition HTTP header field in the permanent HTTP header field registry
    693          (see <a href="#RFC3864" id="rfc.xref.RFC3864.1"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>).
    694       </p>
    695       <p id="rfc.section.8.2.p.2"> </p>
    696       <dl>
    697          <dt>Header field name:</dt>
    698          <dd>Content-Disposition</dd>
    699          <dt>Applicable protocol:</dt>
    700          <dd>http</dd>
    701          <dt>Status:</dt>
    702          <dd>standard</dd>
    703          <dt>Author/Change controller:</dt>
    704          <dd>IETF</dd>
    705          <dt>Specification document:</dt>
    706          <dd>this specification (<a href="#header.field.definition" id="rfc.xref.header.field.definition.1" title="Header Field Definition">Section&nbsp;4</a>)
    707          </dd>
    708       </dl>
    709       <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;Acknowledgements
    710       </h1>
    711       <p id="rfc.section.9.p.1">Thanks to Adam Barth, Rolf Eike Beer, Bjoern Hoehrmann, Alfred Hoenes, Roar Lauritzsen, Henrik Nordstrom, and Mark Nottingham
    712          for their valuable feedback.
    713       </p>
     704</pre><p>Note: as of February 2011, those user agents that do not support the RFC 5987 encoding ignore "filename*" when it occurs after
     705            "filename". Unfortunately, some user agents that do support RFC 5987 do pick the "filename" rather than the "filename*" parameter
     706            when it occurs first; it is expected that this situation is going to improve soon.
     707         </p>
     708      </div>
     709      <div id="i18n">
     710         <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a href="#i18n">Internationalization Considerations</a></h1>
     711         <p id="rfc.section.6.p.1">The "filename*" parameter (<a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>), using the encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.5"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>, allows the server to transmit characters outside the ISO-8859-1 character set, and also to optionally specify the language
     712            in use.
     713         </p>
     714         <p id="rfc.section.6.p.2">Future parameters might also require internationalization, in which case the same encoding can be used.</p>
     715      </div>
     716      <div id="security.considerations">
     717         <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a href="#security.considerations">Security Considerations</a></h1>
     718         <p id="rfc.section.7.p.1">Using server-supplied information for constructing local filenames introduces many risks. These are summarized in <a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>.
     719         </p>
     720         <p id="rfc.section.7.p.2">Furthermore, implementers also ought to be aware of the Security Considerations applying to HTTP (see <a href="https://tools.ietf.org/html/rfc2616#section-15">Section 15</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.9"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>), and also the parameter encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.6"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a> (see <a href="https://tools.ietf.org/html/rfc5987#section-5" id="rfc.xref.RFC5987.7">Section 5</a>).
     721         </p>
     722      </div>
     723      <div id="iana.considerations">
     724         <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a href="#iana.considerations">IANA Considerations</a></h1>
     725         <div id="registry">
     726            <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a href="#registry">Registry for Disposition Values and Parameter</a></h2>
     727            <p id="rfc.section.8.1.p.1">This specification does not introduce any changes to the registration procedures for disposition values and parameters that
     728               are defined in <a href="https://tools.ietf.org/html/rfc2183#section-9">Section 9</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.5"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>.
     729            </p>
     730         </div>
     731         <div id="header.field.registration">
     732            <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a href="#header.field.registration">Header Field Registration</a></h2>
     733            <p id="rfc.section.8.2.p.1">This document updates the definition of the Content-Disposition HTTP header field in the permanent HTTP header field registry
     734               (see <a href="#RFC3864" id="rfc.xref.RFC3864.1"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>).
     735            </p>
     736            <p id="rfc.section.8.2.p.2"></p>
     737            <dl>
     738               <dt>Header field name:</dt>
     739               <dd>Content-Disposition</dd>
     740               <dt>Applicable protocol:</dt>
     741               <dd>http</dd>
     742               <dt>Status:</dt>
     743               <dd>standard</dd>
     744               <dt>Author/Change controller:</dt>
     745               <dd>IETF</dd>
     746               <dt>Specification document:</dt>
     747               <dd>this specification (<a href="#header.field.definition" id="rfc.xref.header.field.definition.1" title="Header Field Definition">Section&nbsp;4</a>)
     748               </dd>
     749            </dl>
     750         </div>
     751      </div>
     752      <div>
     753         <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;Acknowledgements
     754         </h1>
     755         <p id="rfc.section.9.p.1">Thanks to Adam Barth, Rolf Eike Beer, Bjoern Hoehrmann, Alfred Hoenes, Roar Lauritzsen, Henrik Nordstrom, and Mark Nottingham
     756            for their valuable feedback.
     757         </p>
     758      </div>
    714759      <h1 id="rfc.references"><a id="rfc.section.10" href="#rfc.section.10">10.</a> References
    715760      </h1>
    716761      <h2 id="rfc.references.1"><a href="#rfc.section.10.1" id="rfc.section.10.1">10.1</a> Normative References
    717762      </h2>
    718       <table>       
     763      <table>
    719764         <tr>
    720765            <td class="reference"><b id="ISO-8859-1">[ISO-8859-1]</b></td>
     
    723768         <tr>
    724769            <td class="reference"><b id="RFC2119">[RFC2119]</b></td>
    725             <td class="top"><a href="mailto:sob@harvard.edu" title="Harvard University">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>”, BCP&nbsp;14, RFC&nbsp;2119, March&nbsp;1997.
     770            <td class="top"><a href="mailto:sob@harvard.edu" title="Harvard University">Bradner, S.</a>, “<a href="https://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>”, BCP&nbsp;14, RFC&nbsp;2119, March&nbsp;1997.
    726771            </td>
    727772         </tr>
    728773         <tr>
    729774            <td class="reference"><b id="RFC2616">[RFC2616]</b></td>
    730             <td class="top"><a href="mailto:fielding@ics.uci.edu" title="University of California, Irvine">Fielding, R.</a>, <a href="mailto:jg@w3.org" title="W3C">Gettys, J.</a>, <a href="mailto:mogul@wrl.dec.com" title="Compaq Computer Corporation">Mogul, J.</a>, <a href="mailto:frystyk@w3.org" title="MIT Laboratory for Computer Science">Frystyk, H.</a>, <a href="mailto:masinter@parc.xerox.com" title="Xerox Corporation">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="W3C">T. Berners-Lee</a>, “<a href="http://tools.ietf.org/html/rfc2616">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2616, June&nbsp;1999.
     775            <td class="top"><a href="mailto:fielding@ics.uci.edu" title="University of California, Irvine">Fielding, R.</a>, <a href="mailto:jg@w3.org" title="W3C">Gettys, J.</a>, <a href="mailto:mogul@wrl.dec.com" title="Compaq Computer Corporation">Mogul, J.</a>, <a href="mailto:frystyk@w3.org" title="MIT Laboratory for Computer Science">Frystyk, H.</a>, <a href="mailto:masinter@parc.xerox.com" title="Xerox Corporation">Masinter, L.</a>, <a href="mailto:paulle@microsoft.com" title="Microsoft Corporation">Leach, P.</a>, and <a href="mailto:timbl@w3.org" title="W3C">T. Berners-Lee</a>, “<a href="https://tools.ietf.org/html/rfc2616">Hypertext Transfer Protocol -- HTTP/1.1</a>”, RFC&nbsp;2616, June&nbsp;1999.
    731776            </td>
    732777         </tr>
    733778         <tr>
    734779            <td class="reference"><b id="RFC5987">[RFC5987]</b></td>
    735             <td class="top"><a href="mailto:julian.reschke@greenbytes.de" title="greenbytes GmbH">Reschke, J.</a>, “<a href="http://tools.ietf.org/html/rfc5987">Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters</a>”, RFC&nbsp;5987, August&nbsp;2010.
     780            <td class="top"><a href="mailto:julian.reschke@greenbytes.de" title="greenbytes GmbH">Reschke, J.</a>, “<a href="https://tools.ietf.org/html/rfc5987">Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters</a>”, RFC&nbsp;5987, August&nbsp;2010.
    736781            </td>
    737782         </tr>
     
    739784      <h2 id="rfc.references.2"><a href="#rfc.section.10.2" id="rfc.section.10.2">10.2</a> Informative References
    740785      </h2>
    741       <table>               
     786      <table>
    742787         <tr>
    743788            <td class="reference"><b id="RFC2046">[RFC2046]</b></td>
    744             <td class="top"><a href="mailto:ned@innosoft.com" title="Innosoft International, Inc.">Freed, N.</a> and <a href="mailto:nsb@nsb.fv.com" title="First Virtual Holdings">N. Borenstein</a>, “<a href="http://tools.ietf.org/html/rfc2046">Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types</a>”, RFC&nbsp;2046, November&nbsp;1996.
     789            <td class="top"><a href="mailto:ned@innosoft.com" title="Innosoft International, Inc.">Freed, N.</a> and <a href="mailto:nsb@nsb.fv.com" title="First Virtual Holdings">N. Borenstein</a>, “<a href="https://tools.ietf.org/html/rfc2046">Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types</a>”, RFC&nbsp;2046, November&nbsp;1996.
    745790            </td>
    746791         </tr>
    747792         <tr>
    748793            <td class="reference"><b id="RFC2047">[RFC2047]</b></td>
    749             <td class="top"><a href="mailto:moore@cs.utk.edu" title="University of Tennessee">Moore, K.</a>, “<a href="http://tools.ietf.org/html/rfc2047">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</a>”, RFC&nbsp;2047, November&nbsp;1996.
     794            <td class="top"><a href="mailto:moore@cs.utk.edu" title="University of Tennessee">Moore, K.</a>, “<a href="https://tools.ietf.org/html/rfc2047">MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text</a>”, RFC&nbsp;2047, November&nbsp;1996.
    750795            </td>
    751796         </tr>
    752797         <tr>
    753798            <td class="reference"><b id="RFC2183">[RFC2183]</b></td>
    754             <td class="top"><a href="mailto:rens@century.com" title="New Century Systems">Troost, R.</a>, <a href="mailto:sdorner@qualcomm.com" title="QUALCOMM Incorporated">Dorner, S.</a>, and <a href="mailto:moore@cs.utk.edu" title="Department of Computer Science">K. Moore</a>, “<a href="http://tools.ietf.org/html/rfc2183">Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field</a>”, RFC&nbsp;2183, August&nbsp;1997.
     799            <td class="top"><a href="mailto:rens@century.com" title="New Century Systems">Troost, R.</a>, <a href="mailto:sdorner@qualcomm.com" title="QUALCOMM Incorporated">Dorner, S.</a>, and <a href="mailto:moore@cs.utk.edu" title="Department of Computer Science">K. Moore</a>, “<a href="https://tools.ietf.org/html/rfc2183">Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field</a>”, RFC&nbsp;2183, August&nbsp;1997.
    755800            </td>
    756801         </tr>
    757802         <tr>
    758803            <td class="reference"><b id="RFC2231">[RFC2231]</b></td>
    759             <td class="top"><a href="mailto:ned.freed@innosoft.com" title="Innosoft International, Inc.">Freed, N.</a> and <a href="mailto:moore@cs.utk.edu" title="University of Tennessee">K. Moore</a>, “<a href="http://tools.ietf.org/html/rfc2231">MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations</a>”, RFC&nbsp;2231, November&nbsp;1997.
     804            <td class="top"><a href="mailto:ned.freed@innosoft.com" title="Innosoft International, Inc.">Freed, N.</a> and <a href="mailto:moore@cs.utk.edu" title="University of Tennessee">K. Moore</a>, “<a href="https://tools.ietf.org/html/rfc2231">MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations</a>”, RFC&nbsp;2231, November&nbsp;1997.
    760805            </td>
    761806         </tr>
    762807         <tr>
    763808            <td class="reference"><b id="RFC2388">[RFC2388]</b></td>
    764             <td class="top"><a href="mailto:masinter@parc.xerox.com" title="Xerox Palo Alto Research Center">Masinter, L.</a>, “<a href="http://tools.ietf.org/html/rfc2388">Returning Values from Forms: multipart/form-data</a>”, RFC&nbsp;2388, August&nbsp;1998.
     809            <td class="top"><a href="mailto:masinter@parc.xerox.com" title="Xerox Palo Alto Research Center">Masinter, L.</a>, “<a href="https://tools.ietf.org/html/rfc2388">Returning Values from Forms: multipart/form-data</a>”, RFC&nbsp;2388, August&nbsp;1998.
    765810            </td>
    766811         </tr>
    767812         <tr>
    768813            <td class="reference"><b id="RFC3864">[RFC3864]</b></td>
    769             <td class="top"><a href="mailto:GK-IETF@ninebynine.org" title="Nine by Nine">Klyne, G.</a>, <a href="mailto:mnot@pobox.com" title="BEA Systems">Nottingham, M.</a>, and <a href="mailto:JeffMogul@acm.org" title="HP Labs">J. Mogul</a>, “<a href="http://tools.ietf.org/html/rfc3864">Registration Procedures for Message Header Fields</a>”, BCP&nbsp;90, RFC&nbsp;3864, September&nbsp;2004.
     814            <td class="top"><a href="mailto:GK-IETF@ninebynine.org" title="Nine by Nine">Klyne, G.</a>, <a href="mailto:mnot@pobox.com" title="BEA Systems">Nottingham, M.</a>, and <a href="mailto:JeffMogul@acm.org" title="HP Labs">J. Mogul</a>, “<a href="https://tools.ietf.org/html/rfc3864">Registration Procedures for Message Header Fields</a>”, BCP&nbsp;90, RFC&nbsp;3864, September&nbsp;2004.
    770815            </td>
    771816         </tr>
    772817         <tr>
    773818            <td class="reference"><b id="RFC3986">[RFC3986]</b></td>
    774             <td class="top"><a href="mailto:timbl@w3.org" title="World Wide Web Consortium">Berners-Lee, T.</a>, <a href="mailto:fielding@gbiv.com" title="Day Software">Fielding, R.</a>, and <a href="mailto:LMM@acm.org" title="Adobe Systems Incorporated">L. Masinter</a>, “<a href="http://tools.ietf.org/html/rfc3986">Uniform Resource Identifier (URI): Generic Syntax</a>”, STD&nbsp;66, RFC&nbsp;3986, January&nbsp;2005.
     819            <td class="top"><a href="mailto:timbl@w3.org" title="World Wide Web Consortium">Berners-Lee, T.</a>, <a href="mailto:fielding@gbiv.com" title="Day Software">Fielding, R.</a>, and <a href="mailto:LMM@acm.org" title="Adobe Systems Incorporated">L. Masinter</a>, “<a href="https://tools.ietf.org/html/rfc3986">Uniform Resource Identifier (URI): Generic Syntax</a>”, STD&nbsp;66, RFC&nbsp;3986, January&nbsp;2005.
    775820            </td>
    776821         </tr>
    777822      </table>
    778       <div class="avoidbreak">
    779          <h1 id="rfc.authors"><a href="#rfc.authors">Author's Address</a></h1>
    780          <address class="vcard"><span class="vcardline"><span class="fn">Julian F. Reschke</span><span class="n hidden"><span class="family-name">Reschke</span><span class="given-name">Julian F.</span></span></span><span class="org vcardline">greenbytes GmbH</span><span class="adr"><span class="street-address vcardline">Hafenweg 16</span><span class="vcardline"><span class="locality">Muenster</span>, <span class="region">NW</span>&nbsp;<span class="postal-code">48155</span></span><span class="country-name vcardline">Germany</span></span><span class="vcardline">Email: <a href="mailto:julian.reschke@greenbytes.de"><span class="email">julian.reschke@greenbytes.de</span></a></span><span class="vcardline">URI: <a href="http://greenbytes.de/tech/webdav/" class="url">http://greenbytes.de/tech/webdav/</a></span></address>
    781       </div>
    782       <h1 id="rfc.section.A" class="np"><a href="#rfc.section.A">A.</a>&nbsp;<a id="changes.from.rfc2616" href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></h1>
    783       <p id="rfc.section.A.p.1">Compared to <a href="http://tools.ietf.org/html/rfc2616#section-19.5.1">Section 19.5.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.10"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, the following normative changes reflecting actual implementations have been made:
    784       </p>
    785       <ul>
    786          <li>According to RFC 2616, the disposition type "attachment" only applies to content of type "application/octet-stream". This
    787             restriction has been removed, because user agents in practice do not check the content type, and it also discourages properly
    788             declaring the media type.
    789          </li>
    790          <li>RFC 2616 only allows "quoted-string" for the filename parameter. This would be an exceptional parameter syntax, and also doesn't
    791             reflect actual use.
    792          </li>
    793          <li>The definition for the disposition type "inline" (<a href="#RFC2183" id="rfc.xref.RFC2183.6"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="http://tools.ietf.org/html/rfc2183#section-2.1">Section 2.1</a>) has been re-added with a suggestion for its processing.
    794          </li>
    795          <li>This specification requires support for the extended parameter encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.8"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>.
    796          </li>
    797       </ul>
    798       <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="diffs.compared.to.rfc2183" href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></h1>
    799       <p id="rfc.section.B.p.1"> <a href="http://tools.ietf.org/html/rfc2183#section-2">Section 2</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.7"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a> defines several additional disposition parameters: "creation-date", "modification-date", "quoted-date-time", and "size". The
    800          majority of user agents does not implement these, thus they have been omitted from this specification.
    801       </p>
    802       <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="alternatives" href="#alternatives">Alternative Approaches to Internationalization</a></h1>
    803       <p id="rfc.section.C.p.1">By default, HTTP header field parameters cannot carry characters outside the ISO-8859-1 (<a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.2"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a>) character encoding (see <a href="#RFC2616" id="rfc.xref.RFC2616.11"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>). For the "filename" parameter, this of course is an unacceptable restriction.
    804       </p>
    805       <p id="rfc.section.C.p.2">Unfortunately, user agent implementers have not managed to come up with an interoperable approach, although the IETF Standards
    806          Track specifies exactly one solution (<a href="#RFC2231" id="rfc.xref.RFC2231.1"><cite title="MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations">[RFC2231]</cite></a>, clarified and profiled for HTTP in <a href="#RFC5987" id="rfc.xref.RFC5987.9"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>).
    807       </p>
    808       <p id="rfc.section.C.p.3">For completeness, the sections below describe the various approaches that have been tried, and explains how they are inferior
    809          to the RFC 5987 encoding used in this specification.
    810       </p>
    811       <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a>&nbsp;<a id="alternatives.rfc2047" href="#alternatives.rfc2047">RFC 2047 Encoding</a></h2>
    812       <p id="rfc.section.C.1.p.1">RFC 2047 defines an encoding mechanism for header fields, but this encoding is not supposed to be used for header field parameters
    813          - see <a href="http://tools.ietf.org/html/rfc2047#section-5">Section 5</a> of <a href="#RFC2047" id="rfc.xref.RFC2047.1"><cite title="MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text">[RFC2047]</cite></a>:
    814       </p>
    815       <blockquote id="rfc.section.C.1.p.2" cite="http://tools.ietf.org/html/rfc2047#section-5">
    816          <p>An 'encoded-word' MUST NOT appear within a 'quoted-string'.</p> 
    817          <p>...</p> 
    818          <p>An 'encoded-word' MUST NOT be used in parameter of a MIME Content-Type or Content-Disposition field, or in any structured
    819             field body except within a 'comment' or 'phrase'.
    820          </p>
    821       </blockquote>
    822       <p id="rfc.section.C.1.p.3">In practice, some user agents implement the encoding, some do not (exposing the encoded string to the user), and some get
    823          confused by it.
    824       </p>
    825       <h2 id="rfc.section.C.2"><a href="#rfc.section.C.2">C.2</a>&nbsp;<a id="alternatives.percent" href="#alternatives.percent">Percent Encoding</a></h2>
    826       <p id="rfc.section.C.2.p.1">Some user agents accept percent encoded (<a href="#RFC3986" id="rfc.xref.RFC3986.1"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="http://tools.ietf.org/html/rfc3986#section-2.1">Section 2.1</a>) sequences of characters. The character encoding being used for decoding depends on various factors, including the encoding
    827          of the referring page, the user agent's locale, its configuration, and also the actual value of the parameter.
    828       </p>
    829       <p id="rfc.section.C.2.p.2">In practice, this is hard to use because those user agents that do not support it will display the escaped character sequence
    830          to the user. For those user agents that do implement this it is difficult to predict what character encoding they actually
    831          expect.
    832       </p>
    833       <h2 id="rfc.section.C.3"><a href="#rfc.section.C.3">C.3</a>&nbsp;<a id="alternatives.sniff" href="#alternatives.sniff">Encoding Sniffing</a></h2>
    834       <p id="rfc.section.C.3.p.1">Some user agents inspect the value (which defaults to ISO-8859-1 for the quoted-string form) and switch to UTF-8 when it seems
    835          to be more likely to be the correct interpretation.
    836       </p>
    837       <p id="rfc.section.C.3.p.2">As with the approaches above, this is not interoperable and furthermore risks misinterpreting the actual value.</p>
    838       <h2 id="rfc.section.C.4"><a href="#rfc.section.C.4">C.4</a>&nbsp;<a id="alternatives.implementations" href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></h2>
    839       <p id="rfc.section.C.4.p.1">Unfortunately, as of February 2011, neither the encoding defined in RFCs 2231 and 5987, nor any of the alternate approaches
    840          discussed above was implemented interoperably. Thus, this specification recommends the approach defined in RFC 5987, which
    841          at least has the advantage of actually being specified properly.
    842       </p>
    843       <p id="rfc.section.C.4.p.2">The table below shows the implementation support for the various approaches:</p>
    844       <div id="rfc.table.u.1">
    845          <table class="tt full left" cellpadding="3" cellspacing="0">
    846             <thead>
    847                <tr>
    848                   <th>User Agent</th>
    849                   <th>RFC 2231/5987</th>
    850                   <th>RFC 2047</th>
    851                   <th>Percent Encoding</th>
    852                   <th>Encoding Sniffing</th>
    853                </tr>
    854             </thead>
    855             <tbody>
    856                <tr>
    857                   <td class="left">Chrome</td>
    858                   <td class="left">yes</td>
    859                   <td class="left">yes</td>
    860                   <td class="left">yes</td>
    861                   <td class="left">yes</td>
    862                </tr>
    863                <tr>
    864                   <td class="left">Firefox</td>
    865                   <td class="left">yes (*)</td>
    866                   <td class="left">yes</td>
    867                   <td class="left">no</td>
    868                   <td class="left">yes</td>
    869                </tr>
    870                <tr>
    871                   <td class="left">Internet Explorer</td>
    872                   <td class="left">yes (**)</td>
    873                   <td class="left">no</td>
    874                   <td class="left">yes</td>
    875                   <td class="left">no</td>
    876                </tr>
    877                <tr>
    878                   <td class="left">Konqueror</td>
    879                   <td class="left">yes</td>
    880                   <td class="left">no</td>
    881                   <td class="left">no</td>
    882                   <td class="left">no</td>
    883                </tr>
    884                <tr>
    885                   <td class="left">Opera</td>
    886                   <td class="left">yes</td>
    887                   <td class="left">no</td>
    888                   <td class="left">no</td>
    889                   <td class="left">no</td>
    890                </tr>
    891                <tr>
    892                   <td class="left">Safari</td>
    893                   <td class="left">no</td>
    894                   <td class="left">no</td>
    895                   <td class="left">no</td>
    896                   <td class="left">yes</td>
    897                </tr>
    898             </tbody>
    899          </table>
    900       </div>
    901       <p id="rfc.section.C.4.p.3">(*) Does not implement the fallback behavior to "filename" described in <a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>.
    902       </p>
    903       <p id="rfc.section.C.4.p.4">(**) Starting with IE9RC, but only implements UTF-8.</p>
    904       <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a id="change.log" href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
    905       <p id="rfc.section.D.p.1">Note: the issues names in the change log entries for draft-reschke-rfc2183-in-http refer to &lt;<a href="http://greenbytes.de/tech/webdav/draft-reschke-rfc2183-in-http-issues.html">http://greenbytes.de/tech/webdav/draft-reschke-rfc2183-in-http-issues.html</a>&gt;.
    906       </p>
    907       <h2 id="rfc.section.D.1"><a href="#rfc.section.D.1">D.1</a>&nbsp;Since draft-reschke-rfc2183-in-http-00
    908       </h2>
    909       <p id="rfc.section.D.1.p.1">Adjust terminology ("header" -&gt; "header field"). Update rfc2231-in-http reference.</p>
    910       <h2 id="rfc.section.D.2"><a href="#rfc.section.D.2">D.2</a>&nbsp;Since draft-reschke-rfc2183-in-http-01
    911       </h2>
    912       <p id="rfc.section.D.2.p.1">Update rfc2231-in-http reference. Actually define the "filename" parameter. Add internationalization considerations. Add examples
    913          using the RFC 5987 encoding. Add overview over other approaches, plus a table reporting implementation status. Add and resolve
    914          issue "nodep2183". Add issues "asciivsiso", "deplboth", "quoted", and "registry".
    915       </p>
    916       <h2 id="rfc.section.D.3"><a href="#rfc.section.D.3">D.3</a>&nbsp;Since draft-reschke-rfc2183-in-http-02
    917       </h2>
    918       <p id="rfc.section.D.3.p.1">Add and close issue "docfallback". Close issues "asciivsiso", "deplboth", "quoted", and "registry".</p>
    919       <h2 id="rfc.section.D.4"><a href="#rfc.section.D.4">D.4</a>&nbsp;Since draft-reschke-rfc2183-in-http-03
    920       </h2>
    921       <p id="rfc.section.D.4.p.1">Updated to be a Working Draft of the IETF HTTPbis Working Group.</p>
    922       <h2 id="rfc.section.D.5"><a href="#rfc.section.D.5">D.5</a>&nbsp;<a id="changes.since.00" href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></h2>
    923       <p id="rfc.section.D.5.p.1">Closed issues: </p>
    924       <ul>
    925          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/242">http://tools.ietf.org/wg/httpbis/trac/ticket/242</a>&gt;: "handling of unknown disposition types"
    926          </li>
    927       </ul>
    928       <p id="rfc.section.D.5.p.2">Slightly updated the notes about the proposed fallback behavior.</p>
    929       <h2 id="rfc.section.D.6"><a href="#rfc.section.D.6">D.6</a>&nbsp;<a id="changes.since.01" href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></h2>
    930       <p id="rfc.section.D.6.p.1">Various editorial improvements.</p>
    931       <h2 id="rfc.section.D.7"><a href="#rfc.section.D.7">D.7</a>&nbsp;<a id="changes.since.02" href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></h2>
    932       <p id="rfc.section.D.7.p.1">Closed issues: </p>
    933       <ul>
    934          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/244">http://tools.ietf.org/wg/httpbis/trac/ticket/244</a>&gt;: "state that repeating parameters are invalid"
    935          </li>
    936          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/245">http://tools.ietf.org/wg/httpbis/trac/ticket/245</a>&gt;: "warn about %xx in filenames being misinterpreted"
    937          </li>
    938          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/246">http://tools.ietf.org/wg/httpbis/trac/ticket/246</a>&gt;: "mention control chars when talking about postprecessing the filename parameter"
    939          </li>
    940       </ul>
    941       <p id="rfc.section.D.7.p.2">Update <a href="#alternatives.implementations" title="Implementations (to be removed by RFC Editor before publication)">Appendix&nbsp;C.4</a>; Opera 10.63 RC implements the recommended fallback behavior.
    942       </p>
    943       <h2 id="rfc.section.D.8"><a href="#rfc.section.D.8">D.8</a>&nbsp;<a id="changes.since.03" href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></h2>
    944       <p id="rfc.section.D.8.p.1">Closed issues: </p>
    945       <ul>
    946          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/252">http://tools.ietf.org/wg/httpbis/trac/ticket/252</a>&gt;: "'modification-date' *is* implemented in Konq 4.5"
    947          </li>
    948          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/253">http://tools.ietf.org/wg/httpbis/trac/ticket/253</a>&gt;: "clarify what LWS means for the Content-Disp grammar"
    949          </li>
    950          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/258">http://tools.ietf.org/wg/httpbis/trac/ticket/258</a>&gt;: "Avoid passive voice in message requirements"
    951          </li>
    952          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/263">http://tools.ietf.org/wg/httpbis/trac/ticket/263</a>&gt;: "text about historical percent-decoding unclear"
    953          </li>
    954          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/264">http://tools.ietf.org/wg/httpbis/trac/ticket/264</a>&gt;: "add explanation of language tagging"
    955          </li>
    956          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/265">http://tools.ietf.org/wg/httpbis/trac/ticket/265</a>&gt;: "Clarify that C-D spec does not apply to multipart upload"
    957          </li>
    958       </ul>
    959       <h2 id="rfc.section.D.9"><a href="#rfc.section.D.9">D.9</a>&nbsp;<a id="changes.since.04" href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></h2>
    960       <p id="rfc.section.D.9.p.1">Updated implementation information (Chrome 9 implements RFC 5987, IE 9 RC implements it for UTF-8 only).</p>
    961       <p id="rfc.section.D.9.p.2">Clarify who requirements are on, add a section discussing conformance and handling of invalid field values in general.</p>
    962       <p id="rfc.section.D.9.p.3">Closed issues: </p>
    963       <ul>
    964          <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/272">http://tools.ietf.org/wg/httpbis/trac/ticket/272</a>&gt;: "Path Separator Characters"
    965          </li>
    966       </ul>
     823      <div id="changes.from.rfc2616">
     824         <h1 id="rfc.section.A" class="np"><a href="#rfc.section.A">A.</a>&nbsp;<a href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></h1>
     825         <p id="rfc.section.A.p.1">Compared to <a href="https://tools.ietf.org/html/rfc2616#section-19.5.1">Section 19.5.1</a> of <a href="#RFC2616" id="rfc.xref.RFC2616.10"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, the following normative changes reflecting actual implementations have been made:
     826         </p>
     827         <ul>
     828            <li>According to RFC 2616, the disposition type "attachment" only applies to content of type "application/octet-stream". This
     829               restriction has been removed, because user agents in practice do not check the content type, and it also discourages properly
     830               declaring the media type.
     831            </li>
     832            <li>RFC 2616 only allows "quoted-string" for the filename parameter. This would be an exceptional parameter syntax, and also doesn't
     833               reflect actual use.
     834            </li>
     835            <li>The definition for the disposition type "inline" (<a href="#RFC2183" id="rfc.xref.RFC2183.6"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a>, <a href="https://tools.ietf.org/html/rfc2183#section-2.1">Section 2.1</a>) has been re-added with a suggestion for its processing.
     836            </li>
     837            <li>This specification requires support for the extended parameter encoding defined in <a href="#RFC5987" id="rfc.xref.RFC5987.8"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>.
     838            </li>
     839         </ul>
     840      </div>
     841      <div id="diffs.compared.to.rfc2183">
     842         <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></h1>
     843         <p id="rfc.section.B.p.1"><a href="https://tools.ietf.org/html/rfc2183#section-2">Section 2</a> of <a href="#RFC2183" id="rfc.xref.RFC2183.7"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a> defines several additional disposition parameters: "creation-date", "modification-date", "quoted-date-time", and "size". The
     844            majority of user agents does not implement these, thus they have been omitted from this specification.
     845         </p>
     846      </div>
     847      <div id="alternatives">
     848         <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a href="#alternatives">Alternative Approaches to Internationalization</a></h1>
     849         <p id="rfc.section.C.p.1">By default, HTTP header field parameters cannot carry characters outside the ISO-8859-1 (<a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.2"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a>) character encoding (see <a href="#RFC2616" id="rfc.xref.RFC2616.11"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="https://tools.ietf.org/html/rfc2616#section-2.2">Section 2.2</a>). For the "filename" parameter, this of course is an unacceptable restriction.
     850         </p>
     851         <p id="rfc.section.C.p.2">Unfortunately, user agent implementers have not managed to come up with an interoperable approach, although the IETF Standards
     852            Track specifies exactly one solution (<a href="#RFC2231" id="rfc.xref.RFC2231.1"><cite title="MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations">[RFC2231]</cite></a>, clarified and profiled for HTTP in <a href="#RFC5987" id="rfc.xref.RFC5987.9"><cite title="Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters">[RFC5987]</cite></a>).
     853         </p>
     854         <p id="rfc.section.C.p.3">For completeness, the sections below describe the various approaches that have been tried, and explains how they are inferior
     855            to the RFC 5987 encoding used in this specification.
     856         </p>
     857         <div id="alternatives.rfc2047">
     858            <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a>&nbsp;<a href="#alternatives.rfc2047">RFC 2047 Encoding</a></h2>
     859            <p id="rfc.section.C.1.p.1">RFC 2047 defines an encoding mechanism for header fields, but this encoding is not supposed to be used for header field parameters
     860               - see <a href="https://tools.ietf.org/html/rfc2047#section-5">Section 5</a> of <a href="#RFC2047" id="rfc.xref.RFC2047.1"><cite title="MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text">[RFC2047]</cite></a>:
     861            </p>
     862            <blockquote id="rfc.section.C.1.p.2" cite="http://tools.ietf.org/html/rfc2047#section-5">
     863               <p>An 'encoded-word' MUST NOT appear within a 'quoted-string'.</p>
     864               <p>...</p>
     865               <p>An 'encoded-word' MUST NOT be used in parameter of a MIME Content-Type or Content-Disposition field, or in any structured
     866                  field body except within a 'comment' or 'phrase'.
     867               </p>
     868            </blockquote>
     869            <p id="rfc.section.C.1.p.3">In practice, some user agents implement the encoding, some do not (exposing the encoded string to the user), and some get
     870               confused by it.
     871            </p>
     872         </div>
     873         <div id="alternatives.percent">
     874            <h2 id="rfc.section.C.2"><a href="#rfc.section.C.2">C.2</a>&nbsp;<a href="#alternatives.percent">Percent Encoding</a></h2>
     875            <p id="rfc.section.C.2.p.1">Some user agents accept percent encoded (<a href="#RFC3986" id="rfc.xref.RFC3986.1"><cite title="Uniform Resource Identifier (URI): Generic Syntax">[RFC3986]</cite></a>, <a href="https://tools.ietf.org/html/rfc3986#section-2.1">Section 2.1</a>) sequences of characters. The character encoding being used for decoding depends on various factors, including the encoding
     876               of the referring page, the user agent's locale, its configuration, and also the actual value of the parameter.
     877            </p>
     878            <p id="rfc.section.C.2.p.2">In practice, this is hard to use because those user agents that do not support it will display the escaped character sequence
     879               to the user. For those user agents that do implement this it is difficult to predict what character encoding they actually
     880               expect.
     881            </p>
     882         </div>
     883         <div id="alternatives.sniff">
     884            <h2 id="rfc.section.C.3"><a href="#rfc.section.C.3">C.3</a>&nbsp;<a href="#alternatives.sniff">Encoding Sniffing</a></h2>
     885            <p id="rfc.section.C.3.p.1">Some user agents inspect the value (which defaults to ISO-8859-1 for the quoted-string form) and switch to UTF-8 when it seems
     886               to be more likely to be the correct interpretation.
     887            </p>
     888            <p id="rfc.section.C.3.p.2">As with the approaches above, this is not interoperable and furthermore risks misinterpreting the actual value.</p>
     889         </div>
     890         <div id="alternatives.implementations">
     891            <h2 id="rfc.section.C.4"><a href="#rfc.section.C.4">C.4</a>&nbsp;<a href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></h2>
     892            <p id="rfc.section.C.4.p.1">Unfortunately, as of February 2011, neither the encoding defined in RFCs 2231 and 5987, nor any of the alternate approaches
     893               discussed above was implemented interoperably. Thus, this specification recommends the approach defined in RFC 5987, which
     894               at least has the advantage of actually being specified properly.
     895            </p>
     896            <p id="rfc.section.C.4.p.2">The table below shows the implementation support for the various approaches:</p>
     897            <div id="rfc.table.u.1">
     898               <table class="tt full left" cellpadding="3" cellspacing="0">
     899                  <thead>
     900                     <tr>
     901                        <th>User Agent</th>
     902                        <th>RFC 2231/5987</th>
     903                        <th>RFC 2047</th>
     904                        <th>Percent Encoding</th>
     905                        <th>Encoding Sniffing</th>
     906                     </tr>
     907                  </thead>
     908                  <tbody>
     909                     <tr>
     910                        <td class="left">Chrome</td>
     911                        <td class="left">yes</td>
     912                        <td class="left">yes</td>
     913                        <td class="left">yes</td>
     914                        <td class="left">yes</td>
     915                     </tr>
     916                     <tr>
     917                        <td class="left">Firefox</td>
     918                        <td class="left">yes (*)</td>
     919                        <td class="left">yes</td>
     920                        <td class="left">no</td>
     921                        <td class="left">yes</td>
     922                     </tr>
     923                     <tr>
     924                        <td class="left">Internet Explorer</td>
     925                        <td class="left">yes (**)</td>
     926                        <td class="left">no</td>
     927                        <td class="left">yes</td>
     928                        <td class="left">no</td>
     929                     </tr>
     930                     <tr>
     931                        <td class="left">Konqueror</td>
     932                        <td class="left">yes</td>
     933                        <td class="left">no</td>
     934                        <td class="left">no</td>
     935                        <td class="left">no</td>
     936                     </tr>
     937                     <tr>
     938                        <td class="left">Opera</td>
     939                        <td class="left">yes</td>
     940                        <td class="left">no</td>
     941                        <td class="left">no</td>
     942                        <td class="left">no</td>
     943                     </tr>
     944                     <tr>
     945                        <td class="left">Safari</td>
     946                        <td class="left">no</td>
     947                        <td class="left">no</td>
     948                        <td class="left">no</td>
     949                        <td class="left">yes</td>
     950                     </tr>
     951                  </tbody>
     952               </table>
     953            </div>
     954            <p id="rfc.section.C.4.p.3">(*) Does not implement the fallback behavior to "filename" described in <a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section&nbsp;4.3</a>.
     955            </p>
     956            <p id="rfc.section.C.4.p.4">(**) Starting with IE9RC, but only implements UTF-8.</p>
     957         </div>
     958      </div>
     959      <div id="change.log">
     960         <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a>&nbsp;<a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1>
     961         <p id="rfc.section.D.p.1">Note: the issues names in the change log entries for draft-reschke-rfc2183-in-http refer to &lt;<a href="http://greenbytes.de/tech/webdav/draft-reschke-rfc2183-in-http-issues.html">http://greenbytes.de/tech/webdav/draft-reschke-rfc2183-in-http-issues.html</a>&gt;.
     962         </p>
     963         <div>
     964            <h2 id="rfc.section.D.1"><a href="#rfc.section.D.1">D.1</a>&nbsp;Since draft-reschke-rfc2183-in-http-00
     965            </h2>
     966            <p id="rfc.section.D.1.p.1">Adjust terminology ("header" -&gt; "header field"). Update rfc2231-in-http reference.</p>
     967         </div>
     968         <div>
     969            <h2 id="rfc.section.D.2"><a href="#rfc.section.D.2">D.2</a>&nbsp;Since draft-reschke-rfc2183-in-http-01
     970            </h2>
     971            <p id="rfc.section.D.2.p.1">Update rfc2231-in-http reference. Actually define the "filename" parameter. Add internationalization considerations. Add examples
     972               using the RFC 5987 encoding. Add overview over other approaches, plus a table reporting implementation status. Add and resolve
     973               issue "nodep2183". Add issues "asciivsiso", "deplboth", "quoted", and "registry".
     974            </p>
     975         </div>
     976         <div>
     977            <h2 id="rfc.section.D.3"><a href="#rfc.section.D.3">D.3</a>&nbsp;Since draft-reschke-rfc2183-in-http-02
     978            </h2>
     979            <p id="rfc.section.D.3.p.1">Add and close issue "docfallback". Close issues "asciivsiso", "deplboth", "quoted", and "registry".</p>
     980         </div>
     981         <div>
     982            <h2 id="rfc.section.D.4"><a href="#rfc.section.D.4">D.4</a>&nbsp;Since draft-reschke-rfc2183-in-http-03
     983            </h2>
     984            <p id="rfc.section.D.4.p.1">Updated to be a Working Draft of the IETF HTTPbis Working Group.</p>
     985         </div>
     986         <div id="changes.since.00">
     987            <h2 id="rfc.section.D.5"><a href="#rfc.section.D.5">D.5</a>&nbsp;<a href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></h2>
     988            <p id="rfc.section.D.5.p.1">Closed issues: </p>
     989            <ul>
     990               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/242">http://tools.ietf.org/wg/httpbis/trac/ticket/242</a>&gt;: "handling of unknown disposition types"
     991               </li>
     992            </ul>
     993            <p id="rfc.section.D.5.p.2">Slightly updated the notes about the proposed fallback behavior.</p>
     994         </div>
     995         <div id="changes.since.01">
     996            <h2 id="rfc.section.D.6"><a href="#rfc.section.D.6">D.6</a>&nbsp;<a href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></h2>
     997            <p id="rfc.section.D.6.p.1">Various editorial improvements.</p>
     998         </div>
     999         <div id="changes.since.02">
     1000            <h2 id="rfc.section.D.7"><a href="#rfc.section.D.7">D.7</a>&nbsp;<a href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></h2>
     1001            <p id="rfc.section.D.7.p.1">Closed issues: </p>
     1002            <ul>
     1003               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/244">http://tools.ietf.org/wg/httpbis/trac/ticket/244</a>&gt;: "state that repeating parameters are invalid"
     1004               </li>
     1005               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/245">http://tools.ietf.org/wg/httpbis/trac/ticket/245</a>&gt;: "warn about %xx in filenames being misinterpreted"
     1006               </li>
     1007               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/246">http://tools.ietf.org/wg/httpbis/trac/ticket/246</a>&gt;: "mention control chars when talking about postprecessing the filename parameter"
     1008               </li>
     1009            </ul>
     1010            <p id="rfc.section.D.7.p.2">Update <a href="#alternatives.implementations" title="Implementations (to be removed by RFC Editor before publication)">Appendix&nbsp;C.4</a>; Opera 10.63 RC implements the recommended fallback behavior.
     1011            </p>
     1012         </div>
     1013         <div id="changes.since.03">
     1014            <h2 id="rfc.section.D.8"><a href="#rfc.section.D.8">D.8</a>&nbsp;<a href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></h2>
     1015            <p id="rfc.section.D.8.p.1">Closed issues: </p>
     1016            <ul>
     1017               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/252">http://tools.ietf.org/wg/httpbis/trac/ticket/252</a>&gt;: "'modification-date' *is* implemented in Konq 4.5"
     1018               </li>
     1019               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/253">http://tools.ietf.org/wg/httpbis/trac/ticket/253</a>&gt;: "clarify what LWS means for the Content-Disp grammar"
     1020               </li>
     1021               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/258">http://tools.ietf.org/wg/httpbis/trac/ticket/258</a>&gt;: "Avoid passive voice in message requirements"
     1022               </li>
     1023               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/263">http://tools.ietf.org/wg/httpbis/trac/ticket/263</a>&gt;: "text about historical percent-decoding unclear"
     1024               </li>
     1025               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/264">http://tools.ietf.org/wg/httpbis/trac/ticket/264</a>&gt;: "add explanation of language tagging"
     1026               </li>
     1027               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/265">http://tools.ietf.org/wg/httpbis/trac/ticket/265</a>&gt;: "Clarify that C-D spec does not apply to multipart upload"
     1028               </li>
     1029            </ul>
     1030         </div>
     1031         <div id="changes.since.04">
     1032            <h2 id="rfc.section.D.9"><a href="#rfc.section.D.9">D.9</a>&nbsp;<a href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></h2>
     1033            <p id="rfc.section.D.9.p.1">Updated implementation information (Chrome 9 implements RFC 5987, IE 9 RC implements it for UTF-8 only).</p>
     1034            <p id="rfc.section.D.9.p.2">Clarify who requirements are on, add a section discussing conformance and handling of invalid field values in general.</p>
     1035            <p id="rfc.section.D.9.p.3">Closed issues: </p>
     1036            <ul>
     1037               <li>&lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/272">http://tools.ietf.org/wg/httpbis/trac/ticket/272</a>&gt;: "Path Separator Characters"
     1038               </li>
     1039            </ul>
     1040         </div>
     1041      </div>
    9671042      <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1>
    9681043      <p class="noprint"><a href="#rfc.index.C">C</a> <a href="#rfc.index.H">H</a> <a href="#rfc.index.I">I</a> <a href="#rfc.index.R">R</a>
     
    10251100         </ul>
    10261101      </div>
     1102      <div class="avoidbreak">
     1103         <h1 id="rfc.authors"><a href="#rfc.authors">Author's Address</a></h1>
     1104         <p><b>Julian F. Reschke</b><br>greenbytes GmbH<br>Hafenweg 16<br>Muenster, NW&nbsp;48155<br>Germany<br>Email: <a href="mailto:julian.reschke@greenbytes.de">julian.reschke@greenbytes.de</a><br>URI: <a href="http://greenbytes.de/tech/webdav/">http://greenbytes.de/tech/webdav/</a></p>
     1105      </div>
    10271106   </body>
    10281107</html>
Note: See TracChangeset for help on using the changeset viewer.