One document matched: draft-reschke-rfc2183-in-http-00.txt
Network Working Group J. Reschke
Internet-Draft greenbytes
Updates: 2616 (if approved) October 16, 2009
Intended status: Standards Track
Expires: April 19, 2010
Use of the Content-Disposition Header Field in the
Hypertext Transfer Protocol (HTTP)
draft-reschke-rfc2183-in-http-00
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Abstract
HTTP/1.1 defines the Content-Disposition Response Header, but points
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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 considerations.
Editorial Note (To be removed by RFC Editor before publication)
This specification is expected to replace the definition of Content-
Disposition in the HTTP/1.1 specification, as currently revised by
the IETF HTTPbis working group. See also
<http://www3.tools.ietf.org/wg/httpbis/trac/ticket/123>.
Distribution of this document is unlimited. Although this is not a
work item of the HTTPbis Working Group, comments should be sent to
the Hypertext Transfer Protocol (HTTP) mailing list at
ietf-http-wg@w3.org [1], which may be joined by sending a message
with subject "subscribe" to ietf-http-wg-request@w3.org [2].
Discussions of the HTTPbis Working Group are archived at
<http://lists.w3.org/Archives/Public/ietf-http-wg/>.
XML versions, latest edits and the issues list for this document are
available from
<http://greenbytes.de/tech/webdav/#draft-reschke-rfc2183-in-http>. A
collection of test cases is available at
<http://greenbytes.de/tech/tc2231/>.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 4
3. Header Definition . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Grammar . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Disposition Type . . . . . . . . . . . . . . . . . . . . . 5
3.3. Disposition Parameter: 'Filename' . . . . . . . . . . . . . 5
3.4. Disposition Parameter: Extensions . . . . . . . . . . . . . 5
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
6.1. Registry for Disposition Values and Parameter . . . . . . . 6
6.2. Header Registration . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . . 7
Appendix A. Changes from the RFC 2616 Definition . . . . . . . . . 7
Appendix B. Differences compared to RFC 2183 . . . . . . . . . . . 7
Appendix C. Alternative Approaches to Filename Escaping . . . . . 8
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 8
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1. Introduction
HTTP/1.1 defines the Content-Disposition response header in Section
19.5.1 of [RFC2616], but points out that is not part of the HTTP/1.1
Standard (Section 15.5):
Content-Disposition is not part of the HTTP standard, but since it
is widely implemented, we are documenting its use and risks for
implementors.
This specification takes over the definition and registration of
Content-Disposition, as used in HTTP. Based on interoperability
testing with existing User Agents, it defines a profile of the
features defined in the MIME variant ([RFC2183]) of the header, and
also clarifies internationalization considerations.
2. Notational Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
This specification uses the augmented BNF notation defined in Section
2.1 of [RFC2616], including its rules for linear whitespace (LWS).
3. Header Definition
3.1. Grammar
content-disposition = "Content-Disposition" ":"
disposition-type *( ";" disposition-parm )
disposition-type = "inline" | "attachment" | disp-ext-type
; case-insensitive
disp-ext-type = token
disposition-parm = filename-parm | disp-ext-parm
filename-parm = "filename" "=" value
| "filename*" "=" ext-value
disp-ext-parm = token "=" value
| ext-token "=" ext-value
ext-token = <the characters in token, followed by "*">
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Defined in [RFC2616]:
token = <token, defined in [RFC2616], Section 2.2>
value = <value, defined in [RFC2616], Section 3.6>
Defined in [draft-reschke-rfc2231-in-http]:
ext-value = <ext-value, defined in [draft-reschke-rfc2231-in-http], Section 3.2>
3.2. Disposition Type
If the disposition type matches "attachment" (case-insensitively),
the implied suggestion is that the user agent should not display the
response, but directly enter a "save response as..." dialog.
On the other hand, if it matches "inline", this implies regular
processing. Note that this type may be used when it is desirable to
transport filename information for the case of a subsequent, user-
initiated, save operation.
Other disposition types SHOULD be handled the same way as
"attachment" ([RFC2183], Section 2.8).
3.3. Disposition Parameter: 'Filename'
[[anchor3: Talk about expected behavior, mention security
considerations.]]
3.4. Disposition Parameter: Extensions
Parameters other then "filename" SHOULD be ignored ([RFC2183],
Section 2.8).
4. Examples
Direct UA to show "save as" dialog, with a filename of "foo.html":
Content-Disposition: Attachment; filename=foo.html
Direct UA to behave as if the Content-Disposition header wasn't
present, but to remember the filename "foo.html" for a subsequent
save operation:
Content-Disposition: INLINE; FILENAME= "foo.html"
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5. Security Considerations
[[csec: Both refer to 2183, and also mention: long filenames, dot and
dotdot, absolute paths, mismatches between media type and extension]]
6. IANA Considerations
6.1. Registry for Disposition Values and Parameter
Section 9 of [RFC2183] defines the registration procedure for new
disposition values and parameters.
6.2. Header Registration
This document updates the definition of the Content-Disposition HTTP
header in the permanent HTTP header registry (see [RFC3864]).
Header field name: Content-Disposition
Applicable protocol: http
Status: standard
Author/Change controller: IETF
Specification document: this specification (Section 3)
7. Acknowledgements
[[anchor6: TBD.]]
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2183] Troost, R., Dorner, S., and K. Moore, "Communicating
Presentation Information in Internet Messages: The
Content-Disposition Header Field", RFC 2183, August 1997.
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
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[draft-reschke-rfc2231-in-http]
Reschke, J., "Applicability of RFC 2231 Encoding to
Hypertext Transfer Protocol (HTTP) Headers",
draft-reschke-rfc2231-in-http-05 (work in progress),
October 2009.
8.2. Informative References
[RFC3864] Klyne, G., Nottingham, M., and J. Mogul, "Registration
Procedures for Message Header Fields", BCP 90, RFC 3864,
September 2004.
URIs
[1] <mailto:ietf-http-wg@w3.org>
[2] <mailto:ietf-http-wg-request@w3.org?subject=subscribe>
Appendix A. Changes from the RFC 2616 Definition
Compared to Section 19.5.1 of [RFC2616], the following normative
changes reflecting actual implementations have been made:
o According to RFC 2616, the disposition type "attachment" only
applies to content of type "application/octet-stream". This
restriction has been removed, because user agents in practice do
not check the content type, and it also discourages properly
declaring the media type.
o The definition for the disposition type "inline" ([RFC2183],
Section 2.1) has been re-added with a suggestion for its
processing.
o This specification requires support for the extended parameter
encoding defined in [draft-reschke-rfc2231-in-http].
Appendix B. Differences compared to RFC 2183
Section 2 of [RFC2183] defines several additional disposition
parameters: "creation-date", "modification-date", "quoted-date-time",
and "size". These do not appear to be implemented by any user agent,
thus have been ommitted from this specification.
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Appendix C. Alternative Approaches to Filename Escaping
[[anchor10: Mention: RFC 2047, IE, Safari]]
Index
C
Content-Disposition header 4
H
Headers
Content-Disposition 4
Author's Address
Julian F. Reschke
greenbytes GmbH
Hafenweg 16
Muenster, NW 48155
Germany
Email: julian.reschke@greenbytes.de
URI: http://greenbytes.de/tech/webdav/
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