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| 6 | <title>Use of the Content-Disposition Header Field |
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| 7 | in the Hypertext Transfer Protocol (HTTP) |
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| 323 | |
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| 324 | |
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| 328 | } |
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| 329 | |
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| 334 | |
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| 337 | } |
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| 338 | |
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| 341 | color: black; |
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| 342 | background-color: white; |
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| 343 | vertical-align: top; |
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| 344 | font-size: 110%; |
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| 345 | } |
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| 346 | |
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| 349 | } |
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| 350 | |
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| 354 | |
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| 357 | -moz-column-count: 2; |
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| 359 | } |
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| 360 | } |
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| 361 | |
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| 362 | @page { |
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| 363 | @top-left { |
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| 364 | content: "Internet-Draft"; |
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| 365 | } |
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| 366 | @top-right { |
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| 367 | content: "March 2011"; |
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| 368 | } |
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| 369 | @top-center { |
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| 370 | content: "Content-Disposition in HTTP"; |
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| 371 | } |
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| 372 | @bottom-left { |
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| 373 | content: "Reschke"; |
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| 374 | } |
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| 375 | @bottom-center { |
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| 376 | content: "Expires September 29, 2011"; |
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| 377 | } |
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| 378 | @bottom-right { |
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| 379 | content: "[Page " counter(page) "]"; |
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| 380 | } |
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| 381 | } |
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| 382 | |
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| 383 | @page:first { |
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| 384 | @top-left { |
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| 385 | content: normal; |
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| 386 | } |
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| 387 | @top-right { |
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| 388 | content: normal; |
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| 389 | } |
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| 390 | @top-center { |
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| 391 | content: normal; |
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| 392 | } |
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| 393 | } |
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| 394 | </style><link rel="Contents" href="#rfc.toc"> |
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| 395 | <link rel="Author" href="#rfc.authors"> |
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| 396 | <link rel="Copyright" href="#rfc.copyrightnotice"> |
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| 397 | <link rel="Index" href="#rfc.index"> |
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| 398 | <link rel="Chapter" title="1 Introduction" href="#rfc.section.1"> |
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| 399 | <link rel="Chapter" title="2 Notational Conventions" href="#rfc.section.2"> |
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| 400 | <link rel="Chapter" title="3 Conformance and Error Handling" href="#rfc.section.3"> |
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| 401 | <link rel="Chapter" title="4 Header Field Definition" href="#rfc.section.4"> |
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| 402 | <link rel="Chapter" title="5 Examples" href="#rfc.section.5"> |
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| 403 | <link rel="Chapter" title="6 Internationalization Considerations" href="#rfc.section.6"> |
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| 404 | <link rel="Chapter" title="7 Security Considerations" href="#rfc.section.7"> |
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| 405 | <link rel="Chapter" title="8 IANA Considerations" href="#rfc.section.8"> |
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| 406 | <link rel="Chapter" title="9 Acknowledgements" href="#rfc.section.9"> |
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| 407 | <link rel="Chapter" href="#rfc.section.10" title="10 References"> |
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| 408 | <link rel="Appendix" title="A Changes from the RFC 2616 Definition" href="#rfc.section.A"> |
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| 409 | <link rel="Appendix" title="B Differences compared to RFC 2183" href="#rfc.section.B"> |
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| 410 | <link rel="Appendix" title="C Alternative Approaches to Internationalization" href="#rfc.section.C"> |
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| 411 | <link rel="Appendix" title="D Advice on Generating Content-Disposition Header Fields" href="#rfc.section.D"> |
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| 412 | <link rel="Appendix" title="E Change Log (to be removed by RFC Editor before publication)" href="#rfc.section.E"> |
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| 413 | <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/"> |
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| 414 | <link rel="schema.dct" href="http://purl.org/dc/terms/"> |
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| 415 | <meta name="dct.creator" content="Reschke, J. F."> |
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| 416 | <meta name="dct.identifier" content="urn:ietf:id:draft-ietf-httpbis-content-disp-09"> |
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| 417 | <meta name="dct.issued" scheme="ISO8601" content="2011-03-28"> |
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| 418 | <meta name="dct.abstract" content="RFC 2616 defines the Content-Disposition response header field, but points out that it is not part of the HTTP/1.1 Standard. This specification takes over the definition and registration of Content-Disposition, as used in HTTP, and clarifies internationalization aspects."> |
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| 419 | <meta name="description" content="RFC 2616 defines the Content-Disposition response header field, but points out that it is not part of the HTTP/1.1 Standard. This specification takes over the definition and registration of Content-Disposition, as used in HTTP, and clarifies internationalization aspects."> |
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| 420 | </head> |
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| 421 | <body> |
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| 422 | <table class="header"> |
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| 423 | <tbody> |
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| 424 | <tr> |
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| 425 | <td class="left">HTTPbis Working Group</td> |
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| 426 | <td class="right">J. Reschke</td> |
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| 427 | </tr> |
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| 428 | <tr> |
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| 429 | <td class="left">Internet-Draft</td> |
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| 430 | <td class="right">greenbytes</td> |
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| 431 | </tr> |
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| 432 | <tr> |
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| 433 | <td class="left">Updates: <a href="https://tools.ietf.org/html/rfc2616">2616</a> (if approved) |
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| 434 | </td> |
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| 435 | <td class="right">March 28, 2011</td> |
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| 436 | </tr> |
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| 437 | <tr> |
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| 438 | <td class="left">Intended status: Standards Track</td> |
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| 439 | <td class="right"></td> |
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| 440 | </tr> |
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| 441 | <tr> |
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| 442 | <td class="left">Expires: September 29, 2011</td> |
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| 443 | <td class="right"></td> |
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| 444 | </tr> |
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| 445 | </tbody> |
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| 446 | </table> |
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| 447 | <p class="title">Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)<br><span class="filename">draft-ietf-httpbis-content-disp-09</span></p> |
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| 448 | <h1 id="rfc.abstract"><a href="#rfc.abstract">Abstract</a></h1> |
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| 449 | <p>RFC 2616 defines the Content-Disposition response header field, but points out that it is not part of the HTTP/1.1 Standard. |
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| 450 | This specification takes over the definition and registration of Content-Disposition, as used in HTTP, and clarifies internationalization |
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| 451 | aspects. |
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| 452 | </p> |
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| 453 | <h1 id="rfc.note.1"><a href="#rfc.note.1">Editorial Note (To be removed by RFC Editor before publication)</a></h1> |
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| 454 | <p>This specification is expected to replace the definition of Content-Disposition in the HTTP/1.1 specification, as currently |
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| 455 | revised by the IETF HTTPbis working group. See also <<a href="http://trac.tools.ietf.org/wg/httpbis/trac/ticket/123">http://trac.tools.ietf.org/wg/httpbis/trac/ticket/123</a>>. |
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| 456 | </p> |
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| 457 | <p>Discussion of this draft should take place on the HTTPBIS working group mailing list (ietf-http-wg@w3.org). The current issues |
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| 458 | list is at <<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>> and related documents (including fancy diffs) can be found at <<a href="http://tools.ietf.org/wg/httpbis/">http://tools.ietf.org/wg/httpbis/</a>>. |
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| 459 | </p> |
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| 460 | <p>The changes in this draft are summarized in <a href="#changes.since.08" title="Since draft-ietf-httpbis-content-disp-08">Appendix E.13</a>. |
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| 461 | </p> |
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| 462 | <div id="rfc.status"> |
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| 463 | <h1><a href="#rfc.status">Status of This Memo</a></h1> |
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| 464 | <p>This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.</p> |
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| 465 | <p>Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute |
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| 466 | 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>. |
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| 467 | </p> |
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| 468 | <p>Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other |
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| 469 | documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as “work |
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| 470 | in progress”. |
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| 471 | </p> |
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| 472 | <p>This Internet-Draft will expire on September 29, 2011.</p> |
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| 473 | </div> |
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| 474 | <div id="rfc.copyrightnotice"> |
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| 475 | <h1><a href="#rfc.copyrightnotice">Copyright Notice</a></h1> |
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| 476 | <p>Copyright © 2011 IETF Trust and the persons identified as the document authors. All rights reserved.</p> |
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| 477 | <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 |
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| 478 | and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License |
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| 479 | text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified |
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| 480 | BSD License. |
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| 481 | </p> |
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| 482 | </div> |
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| 483 | <hr class="noprint"> |
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| 484 | <h1 class="np" id="rfc.toc"><a href="#rfc.toc">Table of Contents</a></h1> |
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| 485 | <ul class="toc"> |
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| 486 | <li><a href="#rfc.section.1">1.</a> <a href="#introduction">Introduction</a></li> |
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| 487 | <li><a href="#rfc.section.2">2.</a> <a href="#notational.conventions">Notational Conventions</a></li> |
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| 488 | <li><a href="#rfc.section.3">3.</a> <a href="#conformance.and.error.handling">Conformance and Error Handling</a></li> |
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| 489 | <li><a href="#rfc.section.4">4.</a> <a href="#header.field.definition">Header Field Definition</a><ul> |
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| 490 | <li><a href="#rfc.section.4.1">4.1</a> <a href="#rfc.section.4.1">Grammar</a></li> |
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| 491 | <li><a href="#rfc.section.4.2">4.2</a> <a href="#disposition.type">Disposition Type</a></li> |
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| 492 | <li><a href="#rfc.section.4.3">4.3</a> <a href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></li> |
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| 493 | <li><a href="#rfc.section.4.4">4.4</a> <a href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></li> |
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| 494 | <li><a href="#rfc.section.4.5">4.5</a> <a href="#extensibility">Extensibility</a></li> |
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| 495 | </ul> |
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| 496 | </li> |
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| 497 | <li><a href="#rfc.section.5">5.</a> <a href="#examples">Examples</a></li> |
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| 498 | <li><a href="#rfc.section.6">6.</a> <a href="#i18n">Internationalization Considerations</a></li> |
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| 499 | <li><a href="#rfc.section.7">7.</a> <a href="#security.considerations">Security Considerations</a></li> |
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| 500 | <li><a href="#rfc.section.8">8.</a> <a href="#iana.considerations">IANA Considerations</a><ul> |
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| 501 | <li><a href="#rfc.section.8.1">8.1</a> <a href="#registry">Registry for Disposition Values and Parameter</a></li> |
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| 502 | <li><a href="#rfc.section.8.2">8.2</a> <a href="#header.field.registration">Header Field Registration</a></li> |
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| 503 | </ul> |
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| 504 | </li> |
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| 505 | <li><a href="#rfc.section.9">9.</a> <a href="#rfc.section.9">Acknowledgements</a></li> |
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| 506 | <li><a href="#rfc.section.10">10.</a> <a href="#rfc.references">References</a><ul> |
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| 507 | <li><a href="#rfc.section.10.1">10.1</a> <a href="#rfc.references.1">Normative References</a></li> |
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| 508 | <li><a href="#rfc.section.10.2">10.2</a> <a href="#rfc.references.2">Informative References</a></li> |
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| 509 | </ul> |
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| 510 | </li> |
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| 511 | <li><a href="#rfc.section.A">A.</a> <a href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></li> |
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| 512 | <li><a href="#rfc.section.B">B.</a> <a href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></li> |
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| 513 | <li><a href="#rfc.section.C">C.</a> <a href="#alternatives">Alternative Approaches to Internationalization</a><ul> |
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| 514 | <li><a href="#rfc.section.C.1">C.1</a> <a href="#alternatives.rfc2047">RFC 2047 Encoding</a></li> |
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| 515 | <li><a href="#rfc.section.C.2">C.2</a> <a href="#alternatives.percent">Percent Encoding</a></li> |
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| 516 | <li><a href="#rfc.section.C.3">C.3</a> <a href="#alternatives.sniff">Encoding Sniffing</a></li> |
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| 517 | <li><a href="#rfc.section.C.4">C.4</a> <a href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></li> |
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| 518 | </ul> |
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| 519 | </li> |
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| 520 | <li><a href="#rfc.section.D">D.</a> <a href="#advice.generating">Advice on Generating Content-Disposition Header Fields</a></li> |
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| 521 | <li><a href="#rfc.section.E">E.</a> <a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a><ul> |
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| 522 | <li><a href="#rfc.section.E.1">E.1</a> <a href="#rfc.section.E.1">Since draft-reschke-rfc2183-in-http-00</a></li> |
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| 523 | <li><a href="#rfc.section.E.2">E.2</a> <a href="#rfc.section.E.2">Since draft-reschke-rfc2183-in-http-01</a></li> |
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| 524 | <li><a href="#rfc.section.E.3">E.3</a> <a href="#rfc.section.E.3">Since draft-reschke-rfc2183-in-http-02</a></li> |
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| 525 | <li><a href="#rfc.section.E.4">E.4</a> <a href="#rfc.section.E.4">Since draft-reschke-rfc2183-in-http-03</a></li> |
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| 526 | <li><a href="#rfc.section.E.5">E.5</a> <a href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></li> |
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| 527 | <li><a href="#rfc.section.E.6">E.6</a> <a href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></li> |
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| 528 | <li><a href="#rfc.section.E.7">E.7</a> <a href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></li> |
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| 529 | <li><a href="#rfc.section.E.8">E.8</a> <a href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></li> |
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| 530 | <li><a href="#rfc.section.E.9">E.9</a> <a href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></li> |
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| 531 | <li><a href="#rfc.section.E.10">E.10</a> <a href="#changes.since.05">Since draft-ietf-httpbis-content-disp-05</a></li> |
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| 532 | <li><a href="#rfc.section.E.11">E.11</a> <a href="#changes.since.06">Since draft-ietf-httpbis-content-disp-06</a></li> |
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| 533 | <li><a href="#rfc.section.E.12">E.12</a> <a href="#changes.since.07">Since draft-ietf-httpbis-content-disp-07</a></li> |
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| 534 | <li><a href="#rfc.section.E.13">E.13</a> <a href="#changes.since.08">Since draft-ietf-httpbis-content-disp-08</a></li> |
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| 535 | </ul> |
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| 536 | </li> |
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| 537 | <li><a href="#rfc.index">Index</a></li> |
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| 538 | <li><a href="#rfc.authors">Author's Address</a></li> |
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| 539 | </ul> |
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| 540 | <div id="introduction"> |
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| 541 | <h1 id="rfc.section.1" class="np"><a href="#rfc.section.1">1.</a> <a href="#introduction">Introduction</a></h1> |
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| 542 | <p id="rfc.section.1.p.1">RFC 2616 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>): |
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| 543 | </p> |
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| 544 | <blockquote id="rfc.section.1.p.2" cite="http://tools.ietf.org/html/rfc2616#section-15.5"> |
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| 545 | <p>Content-Disposition is not part of the HTTP standard, but since it is widely implemented, we are documenting its use and risks |
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| 546 | for implementers. |
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| 547 | </p> |
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| 548 | </blockquote> |
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| 549 | <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 |
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| 550 | testing with existing User Agents, it fully defines a profile of the features defined in the Multipurpose Internet Mail Extensions |
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| 551 | (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. |
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| 552 | </p> |
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| 553 | <div class="note" id="rfc.section.1.p.4"> |
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| 554 | <p><b>Note:</b> this document does not apply to Content-Disposition header fields appearing in payload bodies transmitted over HTTP, such |
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| 555 | 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>). |
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| 556 | </p> |
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| 557 | </div> |
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| 558 | </div> |
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| 559 | <div id="notational.conventions"> |
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| 560 | <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a> <a href="#notational.conventions">Notational Conventions</a></h1> |
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| 561 | <p id="rfc.section.2.p.1">The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" |
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| 562 | 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>. |
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| 563 | </p> |
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| 564 | <p id="rfc.section.2.p.2">This specification uses the augmented BNF (ABNF) 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). |
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| 565 | </p> |
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| 566 | </div> |
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| 567 | <div id="conformance.and.error.handling"> |
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| 568 | <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a> <a href="#conformance.and.error.handling">Conformance and Error Handling</a></h1> |
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| 569 | <p id="rfc.section.3.p.1">This specification defines conformance criteria for both senders (usually, HTTP origin servers) and recipients (usually, HTTP |
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| 570 | user agents) of the Content-Disposition header field. An implementation is considered conformant if it complies with all of |
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| 571 | the requirements associated with its role. |
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| 572 | </p> |
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| 573 | <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 |
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| 574 | (<a href="#header.field.definition" id="rfc.xref.header.field.definition.1" title="Header Field Definition">Section 4</a>), but it does not define special handling of these invalid field-values. |
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| 575 | </p> |
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| 576 | <p id="rfc.section.3.p.3">Senders <em class="bcp14">MUST NOT</em> generate Content-Disposition header fields that are invalid. |
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| 577 | </p> |
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| 578 | <p id="rfc.section.3.p.4">Recipients <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, |
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| 579 | the default handling of invalid fields is to ignore them. |
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| 580 | </p> |
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| 581 | </div> |
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| 582 | <div id="header.field.definition"> |
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| 583 | <div id="rfc.iref.h.1"></div> |
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| 584 | <div id="rfc.iref.c.1"></div> |
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| 585 | <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a> <a href="#header.field.definition">Header Field Definition</a></h1> |
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| 586 | <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, |
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| 587 | and also can be used to attach additional metadata, such as the filename to use when saving the response payload locally. |
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| 588 | </p> |
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| 589 | <div> |
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| 590 | <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a> Grammar |
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| 591 | </h2> |
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| 592 | <div id="rfc.figure.u.1"></div><pre class="inline"> content-disposition = "Content-Disposition" ":" |
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| 593 | disposition-type *( ";" disposition-parm ) |
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| 594 | |
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| 595 | disposition-type = "inline" | "attachment" | disp-ext-type |
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| 596 | ; case-insensitive |
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| 597 | disp-ext-type = token |
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| 598 | |
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| 599 | disposition-parm = filename-parm | disp-ext-parm |
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| 600 | |
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| 601 | filename-parm = "filename" "=" value |
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| 602 | | "filename*" "=" ext-value |
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| 603 | |
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| 604 | disp-ext-parm = token "=" value |
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| 605 | | ext-token "=" ext-value |
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| 606 | ext-token = <the characters in token, followed by "*"> |
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| 607 | </pre><div id="rfc.figure.u.2"></div> |
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| 608 | <p>Defined in <a href="#RFC2616" id="rfc.xref.RFC2616.4"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>: |
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| 609 | </p><pre class="inline"> token = <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>> |
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| 610 | quoted-string = <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>> |
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| 611 | value = <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>> |
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| 612 | ; token | quoted-string |
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| 613 | |
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| 614 | </pre><div id="rfc.figure.u.3"></div> |
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| 615 | <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>: |
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| 616 | </p><pre class="inline"> ext-value = <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>> |
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| 617 | </pre><p id="rfc.section.4.1.p.4">Content-Disposition header field values with multiple instances of the same parameter name are invalid.</p> |
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| 618 | <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>), <em class="bcp14">OPTIONAL</em> whitespace can appear between words (token or quoted-string) and separator characters. |
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| 619 | </p> |
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| 620 | <p id="rfc.section.4.1.p.6">Furthermore note that the format used for ext-value allows specifying a natural language (e.g., "en"); this is of limited |
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| 621 | use for filenames and is likely to be ignored by recipients. |
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| 622 | </p> |
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| 623 | </div> |
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| 624 | <div id="disposition.type"> |
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| 625 | <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a> <a href="#disposition.type">Disposition Type</a></h2> |
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| 626 | <p id="rfc.section.4.2.p.1">If the disposition type matches "attachment" (case-insensitively), this indicates that the recipient should prompt the user |
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| 627 | to save the response locally, rather than process it normally (as per its media type). |
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| 628 | </p> |
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| 629 | <p id="rfc.section.4.2.p.2">On the other hand, if it matches "inline" (case-insensitively), this implies default processing. Therefore, the disposition |
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| 630 | type "inline" is only useful when it is augmented with additional parameters, such as the filename (see below). |
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| 631 | </p> |
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| 632 | <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>). |
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| 633 | </p> |
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| 634 | </div> |
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| 635 | <div id="disposition.parameter.filename"> |
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| 636 | <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a> <a href="#disposition.parameter.filename">Disposition Parameter: 'Filename'</a></h2> |
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| 637 | <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 |
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| 638 | for storing the message payload. |
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| 639 | </p> |
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| 640 | <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 |
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| 641 | "attachment" disposition type), or later on (for instance, when the user decides to save the contents of the current page |
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| 642 | being displayed). |
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| 643 | </p> |
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| 644 | <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>). |
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| 645 | </p> |
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| 646 | <p id="rfc.section.4.3.p.4">Many user agent implementations predating this specification do not understand the "filename*" parameter. Therefore, when |
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| 647 | 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 |
|---|
| 648 | more expressive "filename*" parameter, and the "filename" parameter as fallback for legacy recipients (see <a href="#examples" title="Examples">Section 5</a> for an example). |
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| 649 | </p> |
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| 650 | <p id="rfc.section.4.3.p.5">It is essential that recipients treat the specified filename as advisory only, thus be very careful in extracting the desired |
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| 651 | information. In particular: |
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| 652 | </p> |
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| 653 | <ul> |
|---|
| 654 | <li> |
|---|
| 655 | <p>Recipients <em class="bcp14">MUST NOT</em> be able to write into any location other than one to which they are specifically entitled. To illustrate the problem consider |
|---|
| 656 | the consequences of being able to overwrite well-known system locations (such as "/etc/passwd"). One strategy to achieve this |
|---|
| 657 | is to never trust folder name information in the filename parameter, for instance by stripping all but the last path segment |
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| 658 | and only consider the actual filename (where 'path segment' are the components of the field value delimited by the path separator |
|---|
| 659 | characters "\" and "/"). |
|---|
| 660 | </p> |
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| 661 | </li> |
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| 662 | <li> |
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| 663 | <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 |
|---|
| 664 | extension could introduce a privilege escalation when the saved file is later opened (consider ".exe"). Thus, recipients which |
|---|
| 665 | make use of file extensions to determine the media type <em class="bcp14">MUST</em> ensure that a file extension is used that is safe, optimally matching the media type of the received payload. |
|---|
| 666 | </p> |
|---|
| 667 | </li> |
|---|
| 668 | <li> |
|---|
| 669 | <p>Recipients <em class="bcp14">SHOULD</em> strip or replace character sequences that are known to cause confusion both in user interfaces and in filenames, such as control |
|---|
| 670 | characters and leading and trailing whitespace. |
|---|
| 671 | </p> |
|---|
| 672 | </li> |
|---|
| 673 | <li> |
|---|
| 674 | <p>Other aspects recipients need to be aware of are names that have a special meaning in the file system or in shell commands, |
|---|
| 675 | such as "." and "..", "~", "|", and also device names. Recipients <em class="bcp14">SHOULD</em> ignore or substitute names like these. |
|---|
| 676 | </p> |
|---|
| 677 | </li> |
|---|
| 678 | </ul> |
|---|
| 679 | <div class="note" id="rfc.section.4.3.p.6"> |
|---|
| 680 | <p><b>Note:</b> Many user agents do not properly handle the escape character "\" when using the quoted-string form. Furthermore, some user |
|---|
| 681 | agents erroneously try to perform unescaping of "percent" escapes (see <a href="#alternatives.percent" title="Percent Encoding">Appendix C.2</a>), and thus might misinterpret filenames containing the percent character followed by two hex digits. |
|---|
| 682 | </p> |
|---|
| 683 | </div> |
|---|
| 684 | </div> |
|---|
| 685 | <div id="disposition.parameter.extensions"> |
|---|
| 686 | <h2 id="rfc.section.4.4"><a href="#rfc.section.4.4">4.4</a> <a href="#disposition.parameter.extensions">Disposition Parameter: Extensions</a></h2> |
|---|
| 687 | <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>). |
|---|
| 688 | </p> |
|---|
| 689 | </div> |
|---|
| 690 | <div id="extensibility"> |
|---|
| 691 | <h2 id="rfc.section.4.5"><a href="#rfc.section.4.5">4.5</a> <a href="#extensibility">Extensibility</a></h2> |
|---|
| 692 | <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 |
|---|
| 693 | using Content-Disposition, such as MIME and HTTP. Therefore, not all registered values may make sense in the context of HTTP. |
|---|
| 694 | </p> |
|---|
| 695 | </div> |
|---|
| 696 | </div> |
|---|
| 697 | <div id="examples"> |
|---|
| 698 | <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a> <a href="#examples">Examples</a></h1> |
|---|
| 699 | <div id="rfc.figure.u.4"></div> |
|---|
| 700 | <p>Direct UA to show "save as" dialog, with a filename of "example.html":</p><pre class="text">Content-Disposition: Attachment; filename=example.html |
|---|
| 701 | </pre><div id="rfc.figure.u.5"></div> |
|---|
| 702 | <p>Direct UA to behave as if the Content-Disposition header field wasn't present, but to remember the filename "an example.html" |
|---|
| 703 | for a subsequent save operation: |
|---|
| 704 | </p><pre class="text">Content-Disposition: INLINE; FILENAME= "an example.html" |
|---|
| 705 | </pre><p>Note: this uses the quoted-string form so that the space character can be included.</p> |
|---|
| 706 | <div id="rfc.figure.u.6"></div> |
|---|
| 707 | <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; |
|---|
| 708 | filename*= UTF-8''<b>%e2%82%ac</b>%20rates |
|---|
| 709 | </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. |
|---|
| 710 | </p> |
|---|
| 711 | <div id="rfc.figure.u.7"></div> |
|---|
| 712 | <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; |
|---|
| 713 | filename="EURO rates"; |
|---|
| 714 | filename*=utf-8''<b>%e2%82%ac</b>%20rates |
|---|
| 715 | </pre><p>Note: those user agents that do not support the RFC 5987 encoding ignore "filename*" when it occurs after "filename".</p> |
|---|
| 716 | </div> |
|---|
| 717 | <div id="i18n"> |
|---|
| 718 | <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a> <a href="#i18n">Internationalization Considerations</a></h1> |
|---|
| 719 | <p id="rfc.section.6.p.1">The "filename*" parameter (<a href="#disposition.parameter.filename" title="Disposition Parameter: 'Filename'">Section 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 |
|---|
| 720 | in use. |
|---|
| 721 | </p> |
|---|
| 722 | <p id="rfc.section.6.p.2">Future parameters might also require internationalization, in which case the same encoding can be used.</p> |
|---|
| 723 | </div> |
|---|
| 724 | <div id="security.considerations"> |
|---|
| 725 | <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a> <a href="#security.considerations">Security Considerations</a></h1> |
|---|
| 726 | <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 4.3</a>. |
|---|
| 727 | </p> |
|---|
| 728 | <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>). |
|---|
| 729 | </p> |
|---|
| 730 | </div> |
|---|
| 731 | <div id="iana.considerations"> |
|---|
| 732 | <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a> <a href="#iana.considerations">IANA Considerations</a></h1> |
|---|
| 733 | <div id="registry"> |
|---|
| 734 | <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a> <a href="#registry">Registry for Disposition Values and Parameter</a></h2> |
|---|
| 735 | <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 |
|---|
| 736 | 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>. |
|---|
| 737 | </p> |
|---|
| 738 | </div> |
|---|
| 739 | <div id="header.field.registration"> |
|---|
| 740 | <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a> <a href="#header.field.registration">Header Field Registration</a></h2> |
|---|
| 741 | <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 |
|---|
| 742 | (see <a href="#RFC3864" id="rfc.xref.RFC3864.1"><cite title="Registration Procedures for Message Header Fields">[RFC3864]</cite></a>). |
|---|
| 743 | </p> |
|---|
| 744 | <p id="rfc.section.8.2.p.2"></p> |
|---|
| 745 | <dl> |
|---|
| 746 | <dt>Header field name:</dt> |
|---|
| 747 | <dd>Content-Disposition</dd> |
|---|
| 748 | <dt>Applicable protocol:</dt> |
|---|
| 749 | <dd>http</dd> |
|---|
| 750 | <dt>Status:</dt> |
|---|
| 751 | <dd>standard</dd> |
|---|
| 752 | <dt>Author/Change controller:</dt> |
|---|
| 753 | <dd>IETF</dd> |
|---|
| 754 | <dt>Specification document:</dt> |
|---|
| 755 | <dd>this specification (<a href="#header.field.definition" id="rfc.xref.header.field.definition.2" title="Header Field Definition">Section 4</a>) |
|---|
| 756 | </dd> |
|---|
| 757 | <dt>Related information:</dt> |
|---|
| 758 | <dd>none</dd> |
|---|
| 759 | </dl> |
|---|
| 760 | </div> |
|---|
| 761 | </div> |
|---|
| 762 | <div> |
|---|
| 763 | <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a> Acknowledgements |
|---|
| 764 | </h1> |
|---|
| 765 | <p id="rfc.section.9.p.1">Thanks to Adam Barth, Rolf Eike Beer, Stewart Bryant, Bjoern Hoehrmann, Alfred Hoenes, Roar Lauritzsen, Alexey Melnikov, Henrik |
|---|
| 766 | Nordstrom, and Mark Nottingham for their valuable feedback. |
|---|
| 767 | </p> |
|---|
| 768 | </div> |
|---|
| 769 | <h1 id="rfc.references"><a id="rfc.section.10" href="#rfc.section.10">10.</a> References |
|---|
| 770 | </h1> |
|---|
| 771 | <h2 id="rfc.references.1"><a href="#rfc.section.10.1" id="rfc.section.10.1">10.1</a> Normative References |
|---|
| 772 | </h2> |
|---|
| 773 | <table> |
|---|
| 774 | <tr> |
|---|
| 775 | <td class="reference"><b id="ISO-8859-1">[ISO-8859-1]</b></td> |
|---|
| 776 | <td class="top">International Organization for Standardization, “Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1”, ISO/IEC 8859-1:1998, 1998.</td> |
|---|
| 777 | </tr> |
|---|
| 778 | <tr> |
|---|
| 779 | <td class="reference"><b id="RFC2119">[RFC2119]</b></td> |
|---|
| 780 | <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 14, RFC 2119, March 1997. |
|---|
| 781 | </td> |
|---|
| 782 | </tr> |
|---|
| 783 | <tr> |
|---|
| 784 | <td class="reference"><b id="RFC2616">[RFC2616]</b></td> |
|---|
| 785 | <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 2616, June 1999. |
|---|
| 786 | </td> |
|---|
| 787 | </tr> |
|---|
| 788 | <tr> |
|---|
| 789 | <td class="reference"><b id="RFC5987">[RFC5987]</b></td> |
|---|
| 790 | <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 5987, August 2010. |
|---|
| 791 | </td> |
|---|
| 792 | </tr> |
|---|
| 793 | </table> |
|---|
| 794 | <h2 id="rfc.references.2"><a href="#rfc.section.10.2" id="rfc.section.10.2">10.2</a> Informative References |
|---|
| 795 | </h2> |
|---|
| 796 | <table> |
|---|
| 797 | <tr> |
|---|
| 798 | <td class="reference"><b id="RFC2046">[RFC2046]</b></td> |
|---|
| 799 | <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 2046, November 1996. |
|---|
| 800 | </td> |
|---|
| 801 | </tr> |
|---|
| 802 | <tr> |
|---|
| 803 | <td class="reference"><b id="RFC2047">[RFC2047]</b></td> |
|---|
| 804 | <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 2047, November 1996. |
|---|
| 805 | </td> |
|---|
| 806 | </tr> |
|---|
| 807 | <tr> |
|---|
| 808 | <td class="reference"><b id="RFC2183">[RFC2183]</b></td> |
|---|
| 809 | <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 2183, August 1997. |
|---|
| 810 | </td> |
|---|
| 811 | </tr> |
|---|
| 812 | <tr> |
|---|
| 813 | <td class="reference"><b id="RFC2231">[RFC2231]</b></td> |
|---|
| 814 | <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 2231, November 1997. |
|---|
| 815 | </td> |
|---|
| 816 | </tr> |
|---|
| 817 | <tr> |
|---|
| 818 | <td class="reference"><b id="RFC2388">[RFC2388]</b></td> |
|---|
| 819 | <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 2388, August 1998. |
|---|
| 820 | </td> |
|---|
| 821 | </tr> |
|---|
| 822 | <tr> |
|---|
| 823 | <td class="reference"><b id="RFC3864">[RFC3864]</b></td> |
|---|
| 824 | <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 90, RFC 3864, September 2004. |
|---|
| 825 | </td> |
|---|
| 826 | </tr> |
|---|
| 827 | <tr> |
|---|
| 828 | <td class="reference"><b id="RFC3986">[RFC3986]</b></td> |
|---|
| 829 | <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 66, RFC 3986, January 2005. |
|---|
| 830 | </td> |
|---|
| 831 | </tr> |
|---|
| 832 | <tr> |
|---|
| 833 | <td class="reference"><b id="US-ASCII">[US-ASCII]</b></td> |
|---|
| 834 | <td class="top">American National Standards Institute, “Coded Character Set -- 7-bit American Standard Code for Information Interchange”, ANSI X3.4, 1986.</td> |
|---|
| 835 | </tr> |
|---|
| 836 | </table> |
|---|
| 837 | <div id="changes.from.rfc2616"> |
|---|
| 838 | <h1 id="rfc.section.A" class="np"><a href="#rfc.section.A">A.</a> <a href="#changes.from.rfc2616">Changes from the RFC 2616 Definition</a></h1> |
|---|
| 839 | <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: |
|---|
| 840 | </p> |
|---|
| 841 | <ul> |
|---|
| 842 | <li>According to RFC 2616, the disposition type "attachment" only applies to content of type "application/octet-stream". This |
|---|
| 843 | restriction has been removed, because recipients in practice do not check the content type, and it also discourages properly |
|---|
| 844 | declaring the media type. |
|---|
| 845 | </li> |
|---|
| 846 | <li>RFC 2616 only allows "quoted-string" for the filename parameter. This would be an exceptional parameter syntax, and also doesn't |
|---|
| 847 | reflect actual use. |
|---|
| 848 | </li> |
|---|
| 849 | <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. |
|---|
| 850 | </li> |
|---|
| 851 | <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>. |
|---|
| 852 | </li> |
|---|
| 853 | </ul> |
|---|
| 854 | </div> |
|---|
| 855 | <div id="diffs.compared.to.rfc2183"> |
|---|
| 856 | <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a> <a href="#diffs.compared.to.rfc2183">Differences compared to RFC 2183</a></h1> |
|---|
| 857 | <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 |
|---|
| 858 | majority of user agents does not implement these, thus they have been omitted from this specification. |
|---|
| 859 | </p> |
|---|
| 860 | </div> |
|---|
| 861 | <div id="alternatives"> |
|---|
| 862 | <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a> <a href="#alternatives">Alternative Approaches to Internationalization</a></h1> |
|---|
| 863 | <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. |
|---|
| 864 | </p> |
|---|
| 865 | <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 |
|---|
| 866 | 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>). |
|---|
| 867 | </p> |
|---|
| 868 | <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 |
|---|
| 869 | to the RFC 5987 encoding used in this specification. |
|---|
| 870 | </p> |
|---|
| 871 | <div id="alternatives.rfc2047"> |
|---|
| 872 | <h2 id="rfc.section.C.1"><a href="#rfc.section.C.1">C.1</a> <a href="#alternatives.rfc2047">RFC 2047 Encoding</a></h2> |
|---|
| 873 | <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 |
|---|
| 874 | - 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>: |
|---|
| 875 | </p> |
|---|
| 876 | <blockquote id="rfc.section.C.1.p.2" cite="http://tools.ietf.org/html/rfc2047#section-5"> |
|---|
| 877 | <p>An 'encoded-word' MUST NOT appear within a 'quoted-string'.</p> |
|---|
| 878 | <p>...</p> |
|---|
| 879 | <p>An 'encoded-word' MUST NOT be used in parameter of a MIME Content-Type or Content-Disposition field, or in any structured |
|---|
| 880 | field body except within a 'comment' or 'phrase'. |
|---|
| 881 | </p> |
|---|
| 882 | </blockquote> |
|---|
| 883 | <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 |
|---|
| 884 | confused by it. |
|---|
| 885 | </p> |
|---|
| 886 | </div> |
|---|
| 887 | <div id="alternatives.percent"> |
|---|
| 888 | <h2 id="rfc.section.C.2"><a href="#rfc.section.C.2">C.2</a> <a href="#alternatives.percent">Percent Encoding</a></h2> |
|---|
| 889 | <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 |
|---|
| 890 | of the referring page, the user agent's locale, its configuration, and also the actual value of the parameter. |
|---|
| 891 | </p> |
|---|
| 892 | <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 |
|---|
| 893 | to the user. For those user agents that do implement this it is difficult to predict what character encoding they actually |
|---|
| 894 | expect. |
|---|
| 895 | </p> |
|---|
| 896 | </div> |
|---|
| 897 | <div id="alternatives.sniff"> |
|---|
| 898 | <h2 id="rfc.section.C.3"><a href="#rfc.section.C.3">C.3</a> <a href="#alternatives.sniff">Encoding Sniffing</a></h2> |
|---|
| 899 | <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 |
|---|
| 900 | to be more likely to be the correct interpretation. |
|---|
| 901 | </p> |
|---|
| 902 | <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> |
|---|
| 903 | </div> |
|---|
| 904 | <div id="alternatives.implementations"> |
|---|
| 905 | <h2 id="rfc.section.C.4"><a href="#rfc.section.C.4">C.4</a> <a href="#alternatives.implementations">Implementations (to be removed by RFC Editor before publication)</a></h2> |
|---|
| 906 | <p id="rfc.section.C.4.p.1">Unfortunately, as of March 2011, neither the encoding defined in RFCs 2231 and 5987, nor any of the alternate approaches discussed |
|---|
| 907 | above was implemented interoperably. Thus, this specification recommends the approach defined in RFC 5987, which at least |
|---|
| 908 | has the advantage of actually being specified properly. |
|---|
| 909 | </p> |
|---|
| 910 | <p id="rfc.section.C.4.p.2">The table below shows the support for the various approaches in the current implementations:</p> |
|---|
| 911 | <div id="rfc.table.u.1"> |
|---|
| 912 | <table class="tt full left" cellpadding="3" cellspacing="0"> |
|---|
| 913 | <thead> |
|---|
| 914 | <tr> |
|---|
| 915 | <th>User Agent</th> |
|---|
| 916 | <th>RFC 2231/5987</th> |
|---|
| 917 | <th>RFC 2047</th> |
|---|
| 918 | <th>Percent Encoding</th> |
|---|
| 919 | <th>Encoding Sniffing</th> |
|---|
| 920 | </tr> |
|---|
| 921 | </thead> |
|---|
| 922 | <tbody> |
|---|
| 923 | <tr> |
|---|
| 924 | <td class="left">Chrome</td> |
|---|
| 925 | <td class="left">yes</td> |
|---|
| 926 | <td class="left">yes</td> |
|---|
| 927 | <td class="left">yes</td> |
|---|
| 928 | <td class="left">yes</td> |
|---|
| 929 | </tr> |
|---|
| 930 | <tr> |
|---|
| 931 | <td class="left">Firefox</td> |
|---|
| 932 | <td class="left">yes (*)</td> |
|---|
| 933 | <td class="left">yes</td> |
|---|
| 934 | <td class="left">no</td> |
|---|
| 935 | <td class="left">yes</td> |
|---|
| 936 | </tr> |
|---|
| 937 | <tr> |
|---|
| 938 | <td class="left">Internet Explorer</td> |
|---|
| 939 | <td class="left">yes (**)</td> |
|---|
| 940 | <td class="left">no</td> |
|---|
| 941 | <td class="left">yes</td> |
|---|
| 942 | <td class="left">no</td> |
|---|
| 943 | </tr> |
|---|
| 944 | <tr> |
|---|
| 945 | <td class="left">Konqueror</td> |
|---|
| 946 | <td class="left">yes</td> |
|---|
| 947 | <td class="left">no</td> |
|---|
| 948 | <td class="left">no</td> |
|---|
| 949 | <td class="left">no</td> |
|---|
| 950 | </tr> |
|---|
| 951 | <tr> |
|---|
| 952 | <td class="left">Opera</td> |
|---|
| 953 | <td class="left">yes</td> |
|---|
| 954 | <td class="left">no</td> |
|---|
| 955 | <td class="left">no</td> |
|---|
| 956 | <td class="left">no</td> |
|---|
| 957 | </tr> |
|---|
| 958 | <tr> |
|---|
| 959 | <td class="left">Safari</td> |
|---|
| 960 | <td class="left">no</td> |
|---|
| 961 | <td class="left">no</td> |
|---|
| 962 | <td class="left">no</td> |
|---|
| 963 | <td class="left">yes</td> |
|---|
| 964 | </tr> |
|---|
| 965 | </tbody> |
|---|
| 966 | </table> |
|---|
| 967 | </div> |
|---|
| 968 | <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 4.3</a>; a fix is planned for Firefox 5. |
|---|
| 969 | </p> |
|---|
| 970 | <p id="rfc.section.C.4.p.4">(**) Starting with Internet Explorer 9, but only implements UTF-8.</p> |
|---|
| 971 | </div> |
|---|
| 972 | </div> |
|---|
| 973 | <div id="advice.generating"> |
|---|
| 974 | <h1 id="rfc.section.D"><a href="#rfc.section.D">D.</a> <a href="#advice.generating">Advice on Generating Content-Disposition Header Fields</a></h1> |
|---|
| 975 | <p id="rfc.section.D.p.1">To successfully interoperate with existing and future user agents, senders of the Content-Disposition header field are advised |
|---|
| 976 | to: |
|---|
| 977 | </p> |
|---|
| 978 | <p id="rfc.section.D.p.2"></p> |
|---|
| 979 | <ul> |
|---|
| 980 | <li>Include a "filename" parameter when US-ASCII (<a href="#US-ASCII" id="rfc.xref.US-ASCII.1"><cite title="Coded Character Set -- 7-bit American Standard Code for Information Interchange">[US-ASCII]</cite></a>) is sufficiently expressive. |
|---|
| 981 | </li> |
|---|
| 982 | <li>Use the 'token' form of the filename parameter only when it does not contain disallowed characters (e.g., spaces); in such |
|---|
| 983 | cases, the quoted-string form should be used. |
|---|
| 984 | </li> |
|---|
| 985 | <li>Avoid including the percent character followed by two hexadecimal characters (e.g., %A9) in the filename parameter, since |
|---|
| 986 | some existing implementations consider it to be an escape character, while others will pass it through unchanged. |
|---|
| 987 | </li> |
|---|
| 988 | <li>Avoid including the "\" character in the quoted-string form of the filename parameter, as escaping is not implemented by some |
|---|
| 989 | user agents, and can be considered as an illegal path character. |
|---|
| 990 | </li> |
|---|
| 991 | <li>Avoid using non-ASCII characters in the filename parameter. Although most existing implementations will decode them as ISO-8859-1, |
|---|
| 992 | some will apply heuristics to detect UTF-8, and thus might fail on certain names. |
|---|
| 993 | </li> |
|---|
| 994 | <li>Include a "filename*" parameter where the desired filename cannot be expressed faithfully using the "filename" form. Note |
|---|
| 995 | that legacy user agents will not process this, and will fall back to using the "filename" parameter's content. |
|---|
| 996 | </li> |
|---|
| 997 | <li>When a "filename*" parameter is sent, to also generate a "filename" parameter as a fallback for user agents that do not support |
|---|
| 998 | the "filename*" form, if possible. This can be done by substituting characters with US-ASCII sequences (e.g., Unicode character |
|---|
| 999 | point U+00E4 (LATIN SMALL LETTER A WITH DIARESIS) by "ae"). Note that this may not be possible in some locales. |
|---|
| 1000 | </li> |
|---|
| 1001 | <li>When a "filename" parameter is included as a fallback (as per above), "filename" should occur first, due to parsing problems |
|---|
| 1002 | in some existing implementations. <span class="comment" id="fallbackbug">[<a href="#fallbackbug" class="smpl">fallbackbug</a>: Firefox is known to pick the wrong parameter; a bug fix is scheduled for Firefox 5. --jre]</span> <span class="comment" id="NOTE-TO-RFC-EDITOR">[<a href="#NOTE-TO-RFC-EDITOR" class="smpl">NOTE-TO-RFC-EDITOR</a>: PLEASE REMOVE THIS AND THE PRECEDING COMMENT BEFORE PUBLICATION AS RFC. --jre]</span> |
|---|
| 1003 | </li> |
|---|
| 1004 | <li>Use UTF-8 as the encoding of the "filename*" parameter, when present, because at least one existing implementation only implements |
|---|
| 1005 | that encoding. |
|---|
| 1006 | </li> |
|---|
| 1007 | </ul> |
|---|
| 1008 | <p id="rfc.section.D.p.3">Note that this advice is based upon UA behaviour at the time of writing, and might be superseded. At the time of publication |
|---|
| 1009 | of this document, <<a href="http://purl.org/NET/http/content-disposition-tests">http://purl.org/NET/http/content-disposition-tests</a>> provides an overview of current levels of support in various implementations. |
|---|
| 1010 | </p> |
|---|
| 1011 | </div> |
|---|
| 1012 | <div id="change.log"> |
|---|
| 1013 | <h1 id="rfc.section.E"><a href="#rfc.section.E">E.</a> <a href="#change.log">Change Log (to be removed by RFC Editor before publication)</a></h1> |
|---|
| 1014 | <p id="rfc.section.E.p.1">Note: the issues names in the change log entries for draft-reschke-rfc2183-in-http refer to <<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>>. |
|---|
| 1015 | </p> |
|---|
| 1016 | <div> |
|---|
| 1017 | <h2 id="rfc.section.E.1"><a href="#rfc.section.E.1">E.1</a> Since draft-reschke-rfc2183-in-http-00 |
|---|
| 1018 | </h2> |
|---|
| 1019 | <p id="rfc.section.E.1.p.1">Adjust terminology ("header" -> "header field"). Update rfc2231-in-http reference.</p> |
|---|
| 1020 | </div> |
|---|
| 1021 | <div> |
|---|
| 1022 | <h2 id="rfc.section.E.2"><a href="#rfc.section.E.2">E.2</a> Since draft-reschke-rfc2183-in-http-01 |
|---|
| 1023 | </h2> |
|---|
| 1024 | <p id="rfc.section.E.2.p.1">Update rfc2231-in-http reference. Actually define the "filename" parameter. Add internationalization considerations. Add examples |
|---|
| 1025 | using the RFC 5987 encoding. Add overview over other approaches, plus a table reporting implementation status. Add and resolve |
|---|
| 1026 | issue "nodep2183". Add issues "asciivsiso", "deplboth", "quoted", and "registry". |
|---|
| 1027 | </p> |
|---|
| 1028 | </div> |
|---|
| 1029 | <div> |
|---|
| 1030 | <h2 id="rfc.section.E.3"><a href="#rfc.section.E.3">E.3</a> Since draft-reschke-rfc2183-in-http-02 |
|---|
| 1031 | </h2> |
|---|
| 1032 | <p id="rfc.section.E.3.p.1">Add and close issue "docfallback". Close issues "asciivsiso", "deplboth", "quoted", and "registry".</p> |
|---|
| 1033 | </div> |
|---|
| 1034 | <div> |
|---|
| 1035 | <h2 id="rfc.section.E.4"><a href="#rfc.section.E.4">E.4</a> Since draft-reschke-rfc2183-in-http-03 |
|---|
| 1036 | </h2> |
|---|
| 1037 | <p id="rfc.section.E.4.p.1">Updated to be a Working Draft of the IETF HTTPbis Working Group.</p> |
|---|
| 1038 | </div> |
|---|
| 1039 | <div id="changes.since.00"> |
|---|
| 1040 | <h2 id="rfc.section.E.5"><a href="#rfc.section.E.5">E.5</a> <a href="#changes.since.00">Since draft-ietf-httpbis-content-disp-00</a></h2> |
|---|
| 1041 | <p id="rfc.section.E.5.p.1">Closed issues: </p> |
|---|
| 1042 | <ul> |
|---|
| 1043 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/242">http://tools.ietf.org/wg/httpbis/trac/ticket/242</a>>: "handling of unknown disposition types" |
|---|
| 1044 | </li> |
|---|
| 1045 | </ul> |
|---|
| 1046 | <p id="rfc.section.E.5.p.2">Slightly updated the notes about the proposed fallback behavior.</p> |
|---|
| 1047 | </div> |
|---|
| 1048 | <div id="changes.since.01"> |
|---|
| 1049 | <h2 id="rfc.section.E.6"><a href="#rfc.section.E.6">E.6</a> <a href="#changes.since.01">Since draft-ietf-httpbis-content-disp-01</a></h2> |
|---|
| 1050 | <p id="rfc.section.E.6.p.1">Various editorial improvements.</p> |
|---|
| 1051 | </div> |
|---|
| 1052 | <div id="changes.since.02"> |
|---|
| 1053 | <h2 id="rfc.section.E.7"><a href="#rfc.section.E.7">E.7</a> <a href="#changes.since.02">Since draft-ietf-httpbis-content-disp-02</a></h2> |
|---|
| 1054 | <p id="rfc.section.E.7.p.1">Closed issues: </p> |
|---|
| 1055 | <ul> |
|---|
| 1056 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/244">http://tools.ietf.org/wg/httpbis/trac/ticket/244</a>>: "state that repeating parameters are invalid" |
|---|
| 1057 | </li> |
|---|
| 1058 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/245">http://tools.ietf.org/wg/httpbis/trac/ticket/245</a>>: "warn about %xx in filenames being misinterpreted" |
|---|
| 1059 | </li> |
|---|
| 1060 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/246">http://tools.ietf.org/wg/httpbis/trac/ticket/246</a>>: "mention control chars when talking about postprecessing the filename parameter" |
|---|
| 1061 | </li> |
|---|
| 1062 | </ul> |
|---|
| 1063 | <p id="rfc.section.E.7.p.2">Update <a href="#alternatives.implementations" title="Implementations (to be removed by RFC Editor before publication)">Appendix C.4</a>; Opera 10.63 RC implements the recommended fallback behavior. |
|---|
| 1064 | </p> |
|---|
| 1065 | </div> |
|---|
| 1066 | <div id="changes.since.03"> |
|---|
| 1067 | <h2 id="rfc.section.E.8"><a href="#rfc.section.E.8">E.8</a> <a href="#changes.since.03">Since draft-ietf-httpbis-content-disp-03</a></h2> |
|---|
| 1068 | <p id="rfc.section.E.8.p.1">Closed issues: </p> |
|---|
| 1069 | <ul> |
|---|
| 1070 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/252">http://tools.ietf.org/wg/httpbis/trac/ticket/252</a>>: "'modification-date' *is* implemented in Konq 4.5" |
|---|
| 1071 | </li> |
|---|
| 1072 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/253">http://tools.ietf.org/wg/httpbis/trac/ticket/253</a>>: "clarify what LWS means for the Content-Disp grammar" |
|---|
| 1073 | </li> |
|---|
| 1074 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/258">http://tools.ietf.org/wg/httpbis/trac/ticket/258</a>>: "Avoid passive voice in message requirements" |
|---|
| 1075 | </li> |
|---|
| 1076 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/263">http://tools.ietf.org/wg/httpbis/trac/ticket/263</a>>: "text about historical percent-decoding unclear" |
|---|
| 1077 | </li> |
|---|
| 1078 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/264">http://tools.ietf.org/wg/httpbis/trac/ticket/264</a>>: "add explanation of language tagging" |
|---|
| 1079 | </li> |
|---|
| 1080 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/265">http://tools.ietf.org/wg/httpbis/trac/ticket/265</a>>: "Clarify that C-D spec does not apply to multipart upload" |
|---|
| 1081 | </li> |
|---|
| 1082 | </ul> |
|---|
| 1083 | </div> |
|---|
| 1084 | <div id="changes.since.04"> |
|---|
| 1085 | <h2 id="rfc.section.E.9"><a href="#rfc.section.E.9">E.9</a> <a href="#changes.since.04">Since draft-ietf-httpbis-content-disp-04</a></h2> |
|---|
| 1086 | <p id="rfc.section.E.9.p.1">Updated implementation information (Chrome 9 implements RFC 5987, IE 9 RC implements it for UTF-8 only).</p> |
|---|
| 1087 | <p id="rfc.section.E.9.p.2">Clarify who requirements are on, add a section discussing conformance and handling of invalid field values in general.</p> |
|---|
| 1088 | <p id="rfc.section.E.9.p.3">Closed issues: </p> |
|---|
| 1089 | <ul> |
|---|
| 1090 | <li><<a href="http://trac.tools.ietf.org/wg/httpbis/trac/ticket/243">http://trac.tools.ietf.org/wg/httpbis/trac/ticket/243</a>>: "avoid stating ISO-8859-1 default for header param" (the default is still mentioned, but it was clarified what it applies |
|---|
| 1091 | to). |
|---|
| 1092 | </li> |
|---|
| 1093 | <li><<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/272">http://tools.ietf.org/wg/httpbis/trac/ticket/272</a>>: "Path Separator Characters" |
|---|
| 1094 | </li> |
|---|
| 1095 | </ul> |
|---|
| 1096 | </div> |
|---|
| 1097 | <div id="changes.since.05"> |
|---|
| 1098 | <h2 id="rfc.section.E.10"><a href="#rfc.section.E.10">E.10</a> <a href="#changes.since.05">Since draft-ietf-httpbis-content-disp-05</a></h2> |
|---|
| 1099 | <p id="rfc.section.E.10.p.1">Editorial changes: Fixed two typos where the new Conformance section said "Content-Location" instead of "Content-Disposition". |
|---|
| 1100 | Cleaned up terminology ("user agent", "recipient", "sender", "message body", ...). Stated what the escape character for quoted-string |
|---|
| 1101 | is. Explained a use case for "inline" disposition type. Updated implementation notes with respect to the fallback behavior. |
|---|
| 1102 | </p> |
|---|
| 1103 | <p id="rfc.section.E.10.p.2">Added appendix "Advice on Generating Content-Disposition Header Fields".</p> |
|---|
| 1104 | </div> |
|---|
| 1105 | <div id="changes.since.06"> |
|---|
| 1106 | <h2 id="rfc.section.E.11"><a href="#rfc.section.E.11">E.11</a> <a href="#changes.since.06">Since draft-ietf-httpbis-content-disp-06</a></h2> |
|---|
| 1107 | <p id="rfc.section.E.11.p.1">Closed issues: </p> |
|---|
| 1108 | <ul> |
|---|
| 1109 | <li><<a href="http://trac.tools.ietf.org/wg/httpbis/trac/ticket/278">http://trac.tools.ietf.org/wg/httpbis/trac/ticket/278</a>>: "conformance language" |
|---|
| 1110 | </li> |
|---|
| 1111 | </ul> |
|---|
| 1112 | </div> |
|---|
| 1113 | <div id="changes.since.07"> |
|---|
| 1114 | <h2 id="rfc.section.E.12"><a href="#rfc.section.E.12">E.12</a> <a href="#changes.since.07">Since draft-ietf-httpbis-content-disp-07</a></h2> |
|---|
| 1115 | <p id="rfc.section.E.12.p.1">Rephrase the requirement about well-known file system locations, and also clarify that by "last path segment" we mean the |
|---|
| 1116 | actual filename. Added a forward reference from "invalid" to the section that defines a valid header field. |
|---|
| 1117 | </p> |
|---|
| 1118 | </div> |
|---|
| 1119 | <div id="changes.since.08"> |
|---|
| 1120 | <h2 id="rfc.section.E.13"><a href="#rfc.section.E.13">E.13</a> <a href="#changes.since.08">Since draft-ietf-httpbis-content-disp-08</a></h2> |
|---|
| 1121 | <p id="rfc.section.E.13.p.1">Update: Internet Explorer 9 is released. Various editorial improvements. Add US-ASCII reference. Strengthen file extension |
|---|
| 1122 | handling requirement to MUST for those recipients that actually use file extensions to map media types. |
|---|
| 1123 | </p> |
|---|
| 1124 | </div> |
|---|
| 1125 | </div> |
|---|
| 1126 | <h1 id="rfc.index"><a href="#rfc.index">Index</a></h1> |
|---|
| 1127 | <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> <a href="#rfc.index.U">U</a> |
|---|
| 1128 | </p> |
|---|
| 1129 | <div class="print2col"> |
|---|
| 1130 | <ul class="ind"> |
|---|
| 1131 | <li><a id="rfc.index.C" href="#rfc.index.C"><b>C</b></a><ul> |
|---|
| 1132 | <li>Content-Disposition header field <a href="#rfc.xref.header.field.definition.1">3</a>, <a href="#rfc.iref.c.1"><b>4</b></a>, <a href="#rfc.xref.header.field.definition.2">8.2</a></li> |
|---|
| 1133 | </ul> |
|---|
| 1134 | </li> |
|---|
| 1135 | <li><a id="rfc.index.H" href="#rfc.index.H"><b>H</b></a><ul> |
|---|
| 1136 | <li>Header Fields |
|---|
| 1137 | <ul> |
|---|
| 1138 | <li>Content-Disposition <a href="#rfc.xref.header.field.definition.1">3</a>, <a href="#rfc.iref.h.1"><b>4</b></a>, <a href="#rfc.xref.header.field.definition.2">8.2</a></li> |
|---|
| 1139 | </ul> |
|---|
| 1140 | </li> |
|---|
| 1141 | </ul> |
|---|
| 1142 | </li> |
|---|
| 1143 | <li><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul> |
|---|
| 1144 | <li><em>ISO-8859-1</em> <a href="#rfc.xref.ISO-8859-1.1">4.3</a>, <a href="#ISO-8859-1"><b>10.1</b></a>, <a href="#rfc.xref.ISO-8859-1.2">C</a></li> |
|---|
| 1145 | </ul> |
|---|
| 1146 | </li> |
|---|
| 1147 | <li><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul> |
|---|
| 1148 | <li><em>RFC2046</em> <a href="#rfc.xref.RFC2046.1">4.3</a>, <a href="#RFC2046"><b>10.2</b></a></li> |
|---|
| 1149 | <li><em>RFC2047</em> <a href="#RFC2047"><b>10.2</b></a>, <a href="#rfc.xref.RFC2047.1">C.1</a><ul> |
|---|
| 1150 | <li><em>Section 5</em> <a href="#rfc.xref.RFC2047.1">C.1</a></li> |
|---|
| 1151 | </ul> |
|---|
| 1152 | </li> |
|---|
| 1153 | <li><em>RFC2119</em> <a href="#rfc.xref.RFC2119.1">2</a>, <a href="#RFC2119"><b>10.1</b></a></li> |
|---|
| 1154 | <li><em>RFC2183</em> <a href="#rfc.xref.RFC2183.1">1</a>, <a href="#rfc.xref.RFC2183.2">4.2</a>, <a href="#rfc.xref.RFC2183.3">4.4</a>, <a href="#rfc.xref.RFC2183.4">4.5</a>, <a href="#rfc.xref.RFC2183.5">8.1</a>, <a href="#RFC2183"><b>10.2</b></a>, <a href="#rfc.xref.RFC2183.6">A</a>, <a href="#rfc.xref.RFC2183.7">B</a><ul> |
|---|
| 1155 | <li><em>Section 2</em> <a href="#rfc.xref.RFC2183.7">B</a></li> |
|---|
| 1156 | <li><em>Section 2.1</em> <a href="#rfc.xref.RFC2183.6">A</a></li> |
|---|
| 1157 | <li><em>Section 2.8</em> <a href="#rfc.xref.RFC2183.2">4.2</a>, <a href="#rfc.xref.RFC2183.3">4.4</a></li> |
|---|
| 1158 | <li><em>Section 9</em> <a href="#rfc.xref.RFC2183.4">4.5</a>, <a href="#rfc.xref.RFC2183.5">8.1</a></li> |
|---|
| 1159 | </ul> |
|---|
| 1160 | </li> |
|---|
| 1161 | <li><em>RFC2231</em> <a href="#RFC2231"><b>10.2</b></a>, <a href="#rfc.xref.RFC2231.1">C</a></li> |
|---|
| 1162 | <li><em>RFC2388</em> <a href="#rfc.xref.RFC2388.1">1</a>, <a href="#RFC2388"><b>10.2</b></a></li> |
|---|
| 1163 | <li><em>RFC2616</em> <a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">1</a>, <a href="#rfc.xref.RFC2616.3">2</a>, <a href="#rfc.xref.RFC2616.4">4.1</a>, <a href="#rfc.xref.RFC2616.5">4.1</a>, <a href="#rfc.xref.RFC2616.6">4.1</a>, <a href="#rfc.xref.RFC2616.7">4.1</a>, <a href="#rfc.xref.RFC2616.8">4.1</a>, <a href="#rfc.xref.RFC2616.9">7</a>, <a href="#RFC2616"><b>10.1</b></a>, <a href="#rfc.xref.RFC2616.10">A</a>, <a href="#rfc.xref.RFC2616.11">C</a><ul> |
|---|
| 1164 | <li><em>Section 2.1</em> <a href="#rfc.xref.RFC2616.3">2</a>, <a href="#rfc.xref.RFC2616.8">4.1</a></li> |
|---|
| 1165 | <li><em>Section 2.2</em> <a href="#rfc.xref.RFC2616.5">4.1</a>, <a href="#rfc.xref.RFC2616.6">4.1</a>, <a href="#rfc.xref.RFC2616.11">C</a></li> |
|---|
| 1166 | <li><em>Section 3.6</em> <a href="#rfc.xref.RFC2616.7">4.1</a></li> |
|---|
| 1167 | <li><em>Section 15.5</em> <a href="#rfc.xref.RFC2616.2">1</a></li> |
|---|
| 1168 | <li><em>Section 15</em> <a href="#rfc.xref.RFC2616.9">7</a></li> |
|---|
| 1169 | <li><em>Section 19.5.1</em> <a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.10">A</a></li> |
|---|
| 1170 | </ul> |
|---|
| 1171 | </li> |
|---|
| 1172 | <li><em>RFC3864</em> <a href="#rfc.xref.RFC3864.1">8.2</a>, <a href="#RFC3864"><b>10.2</b></a></li> |
|---|
| 1173 | <li><em>RFC3986</em> <a href="#RFC3986"><b>10.2</b></a>, <a href="#rfc.xref.RFC3986.1">C.2</a><ul> |
|---|
| 1174 | <li><em>Section 2.1</em> <a href="#rfc.xref.RFC3986.1">C.2</a></li> |
|---|
| 1175 | </ul> |
|---|
| 1176 | </li> |
|---|
| 1177 | <li><em>RFC5987</em> <a href="#rfc.xref.RFC5987.1">4.1</a>, <a href="#rfc.xref.RFC5987.2">4.1</a>, <a href="#rfc.xref.RFC5987.3">4.3</a>, <a href="#rfc.xref.RFC5987.4">5</a>, <a href="#rfc.xref.RFC5987.5">6</a>, <a href="#rfc.xref.RFC5987.6">7</a>, <a href="#rfc.xref.RFC5987.7">7</a>, <a href="#RFC5987"><b>10.1</b></a>, <a href="#rfc.xref.RFC5987.8">A</a>, <a href="#rfc.xref.RFC5987.9">C</a><ul> |
|---|
| 1178 | <li><em>Section 3.2</em> <a href="#rfc.xref.RFC5987.2">4.1</a></li> |
|---|
| 1179 | <li><em>Section 5</em> <a href="#rfc.xref.RFC5987.7">7</a></li> |
|---|
| 1180 | </ul> |
|---|
| 1181 | </li> |
|---|
| 1182 | </ul> |
|---|
| 1183 | </li> |
|---|
| 1184 | <li><a id="rfc.index.U" href="#rfc.index.U"><b>U</b></a><ul> |
|---|
| 1185 | <li><em>US-ASCII</em> <a href="#US-ASCII"><b>10.2</b></a>, <a href="#rfc.xref.US-ASCII.1">D</a></li> |
|---|
| 1186 | </ul> |
|---|
| 1187 | </li> |
|---|
| 1188 | </ul> |
|---|
| 1189 | </div> |
|---|
| 1190 | <div class="avoidbreak"> |
|---|
| 1191 | <h1 id="rfc.authors"><a href="#rfc.authors">Author's Address</a></h1> |
|---|
| 1192 | <p><b>Julian F. Reschke</b><br>greenbytes GmbH<br>Hafenweg 16<br>Muenster, NW 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> |
|---|
| 1193 | </div> |
|---|
| 1194 | </body> |
|---|
| 1195 | </html> |
|---|
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