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+Network Working Group L. Masinter
+Request for Comments: 2397 Xerox Corporation
+Category: Standards Track August 1998
+
+
+ The "data" URL scheme
+
+Status of this Memo
+
+ This document specifies an Internet standards track protocol for the
+ Internet community, and requests discussion and suggestions for
+ improvements. Please refer to the current edition of the "Internet
+ Official Protocol Standards" (STD 1) for the standardization state
+ and status of this protocol. Distribution of this memo is unlimited.
+
+Copyright Notice
+
+ Copyright (C) The Internet Society (1998). All Rights Reserved.
+
+1. Abstract
+
+ A new URL scheme, "data", is defined. It allows inclusion of small
+ data items as "immediate" data, as if it had been included
+ externally.
+
+2. Description
+
+ Some applications that use URLs also have a need to embed (small)
+ media type data directly inline. This document defines a new URL
+ scheme that would work like 'immediate addressing'. The URLs are of
+ the form:
+
+ data:[<mediatype>][;base64],<data>
+
+ The <mediatype> is an Internet media type specification (with
+ optional parameters.) The appearance of ";base64" means that the data
+ is encoded as base64. Without ";base64", the data (as a sequence of
+ octets) is represented using ASCII encoding for octets inside the
+ range of safe URL characters and using the standard %xx hex encoding
+ of URLs for octets outside that range. If <mediatype> is omitted, it
+ defaults to text/plain;charset=US-ASCII. As a shorthand,
+ "text/plain" can be omitted but the charset parameter supplied.
+
+ The "data:" URL scheme is only useful for short values. Note that
+ some applications that use URLs may impose a length limit; for
+ example, URLs embedded within <A> anchors in HTML have a length limit
+ determined by the SGML declaration for HTML [RFC1866]. The LITLEN
+ (1024) limits the number of characters which can appear in a single
+
+
+
+Masinter Standards Track [Page 1]
+
+RFC 2397 The "data" URL scheme August 1998
+
+
+ attribute value literal, the ATTSPLEN (2100) limits the sum of all
+ lengths of all attribute value specifications which appear in a tag,
+ and the TAGLEN (2100) limits the overall length of a tag.
+
+ The "data" URL scheme has no relative URL forms.
+
+3. Syntax
+
+ dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
+ mediatype := [ type "/" subtype ] *( ";" parameter )
+ data := *urlchar
+ parameter := attribute "=" value
+
+ where "urlchar" is imported from [RFC2396], and "type", "subtype",
+ "attribute" and "value" are the corresponding tokens from [RFC2045],
+ represented using URL escaped encoding of [RFC2396] as necessary.
+
+ Attribute values in [RFC2045] are allowed to be either represented as
+ tokens or as quoted strings. However, within a "data" URL, the
+ "quoted-string" representation would be awkward, since the quote mark
+ is itself not a valid urlchar. For this reason, parameter values
+ should use the URL Escaped encoding instead of quoted string if the
+ parameter values contain any "tspecial".
+
+ The ";base64" extension is distinguishable from a content-type
+ parameter by the fact that it doesn't have a following "=" sign.
+
+4. Examples
+
+ A data URL might be used for arbitrary types of data. The URL
+
+ data:,A%20brief%20note
+
+ encodes the text/plain string "A brief note", which might be useful
+ in a footnote link.
+
+ The HTML fragment:
+
+ <IMG
+ SRC="data:image/gif;base64,R0lGODdhMAAwAPAAAAAAAP///ywAAAAAMAAw
+ AAAC8IyPqcvt3wCcDkiLc7C0qwyGHhSWpjQu5yqmCYsapyuvUUlvONmOZtfzgFz
+ ByTB10QgxOR0TqBQejhRNzOfkVJ+5YiUqrXF5Y5lKh/DeuNcP5yLWGsEbtLiOSp
+ a/TPg7JpJHxyendzWTBfX0cxOnKPjgBzi4diinWGdkF8kjdfnycQZXZeYGejmJl
+ ZeGl9i2icVqaNVailT6F5iJ90m6mvuTS4OK05M0vDk0Q4XUtwvKOzrcd3iq9uis
+ F81M1OIcR7lEewwcLp7tuNNkM3uNna3F2JQFo97Vriy/Xl4/f1cf5VWzXyym7PH
+ hhx4dbgYKAAA7"
+ ALT="Larry">
+
+
+
+
+Masinter Standards Track [Page 2]
+
+RFC 2397 The "data" URL scheme August 1998
+
+
+ could be used for a small inline image in a HTML document. (The
+ embedded image is probably near the limit of utility. For anything
+ else larger, data URLs are likely to be inappropriate.)
+
+ A data URL scheme's media type specification can include other
+ parameters; for example, one might specify a charset parameter.
+
+ data:text/plain;charset=iso-8859-7,%be%fg%be
+
+ can be used for a short sequence of greek characters.
+
+ Some applications may use the "data" URL scheme in order to provide
+ setup parameters for other kinds of networking applications. For
+ example, one might create a media type
+ application/vnd-xxx-query
+
+ whose content consists of a query string and a database identifier
+ for the "xxx" vendor's databases. A URL of the form:
+
+ data:application/vnd-xxx-
+ query,select_vcount,fcol_from_fieldtable/local
+
+ could then be used in a local application to launch the "helper" for
+ application/vnd-xxx-query and give it the immediate data included.
+
+5. History
+
+ This idea was originally proposed August 1995. Some versions of the
+ data URL scheme have been used in the definition of VRML, and a
+ version has appeared as part of a proposal for embedded data in HTML.
+ Various changes have been made, based on requests, to elide the media
+ type, pack the indication of the base64 encoding more tightly, and
+ eliminate "quoted printable" as an encoding since it would not easily
+ yield valid URLs without additional %xx encoding, which itself is
+ sufficient. The "data" URL scheme is in use in VRML, new applications
+ of HTML, and various commercial products. It is being used for object
+ parameters in Java and ActiveX applications.
+
+6. Security
+
+ Interpretation of the data within a "data" URL has the same security
+ considerations as any implementation of the given media type. An
+ application should not interpret the contents of a data URL which is
+ marked with a media type that has been disallowed for processing by
+ the application's configuration.
+
+
+
+
+
+
+Masinter Standards Track [Page 3]
+
+RFC 2397 The "data" URL scheme August 1998
+
+
+ Sites which use firewall proxies to disallow the retrieval of certain
+ media types (such as application script languages or types with known
+ security problems) will find it difficult to screen against the
+ inclusion of such types using the "data" URL scheme. However, they
+ should be aware of the threat and take whatever precautions are
+ considered necessary within their domain.
+
+ The effect of using long "data" URLs in applications is currently
+ unknown; some software packages may exhibit unreasonable behavior
+ when confronted with data that exceeds its allocated buffer size.
+
+7. References
+
+ [RFC2396] Berners-Lee, T., Fielding, R., and L. Masinter,
+ "Uniform Resource Identifiers (URI): Generic Syntax", RFC
+ 2396, August 1998.
+
+ [RFC1866] Berners-Lee, T., and D. Connolly, "Hypertext Markup
+ Language - 2.0.", RFC 1866, November 1995.
+
+ [RFC2045] Freed N., and N. Borenstein., "Multipurpose Internet Mail
+ Extensions (MIME) Part One: Format of Internet Message
+ Bodies", RFC 2045, November 1996.
+
+Author contact information:
+
+ Larry Masinter
+ Xerox Palo Alto Research Center
+ 3333 Coyote Hill Road
+ Palo Alto, CA 94304
+
+ EMail: masinter@parc.xerox.com
+
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+Masinter Standards Track [Page 4]
+
+RFC 2397 The "data" URL scheme August 1998
+
+
+Full Copyright Statement
+
+ Copyright (C) The Internet Society (1998). All Rights Reserved.
+
+ This document and translations of it may be copied and furnished to
+ others, and derivative works that comment on or otherwise explain it
+ or assist in its implementation may be prepared, copied, published
+ and distributed, in whole or in part, without restriction of any
+ kind, provided that the above copyright notice and this paragraph are
+ included on all such copies and derivative works. However, this
+ document itself may not be modified in any way, such as by removing
+ the copyright notice or references to the Internet Society or other
+ Internet organizations, except as needed for the purpose of
+ developing Internet standards in which case the procedures for
+ copyrights defined in the Internet Standards process must be
+ followed, or as required to translate it into languages other than
+ English.
+
+ The limited permissions granted above are perpetual and will not be
+ revoked by the Internet Society or its successors or assigns.
+
+ This document and the information contained herein is provided on an
+ "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
+ TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
+ BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
+ HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
+ MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+
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+Masinter Standards Track [Page 5]
+