WDDX
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WDDX (Web Distributed Data eXchange) is a
transport
-neutral data interchange mechanism designed to pass data between different environments and different computers.
History
WDDX was created by Simeon Simeonov of
ColdFusion
server environment.
WDDX was open-sourced later that year.[2]
Usage
WDDX is functionally comparable to
arrays
and recordsets (row/column data, typically coming from database queries).
The data is encoded into
DTD, producing a platform-independent but relatively bulky representation.[4] The XML-encoded data can then be sent to another computer using HTTP, FTP, or other transmission mechanism. The receiving computer must have WDDX-aware software to translate the encoded data into the receiver's native data representation. WDDX can also be used to serialize data structures to storage (file system or database). Many applications use WDDX to pass complex data to browsers where it can be manipulated with JavaScript, as an alternative to JSON
.
Example from
php.net:[5]
<wddxPacket version='1.0'>
<header comment='PHP'/>
<data>
<struct>
<var name='pi'>
<number>3.1415926</number>
</var>
<var name='cities'>
<array length='3'>
<string>Austin</string>
<string>Novato</string>
<string>Seattle</string>
</array>
</var>
</struct>
</data>
</wddxPacket>
Adoption
WDDX is mainly used by
ColdFusion
and, as February 2022, still supported by Adobe.
Outside ColdFusion, libraries exist to read or write this format,
Haskell, Perl
.
PHP used to offer a comprehensive support for WDDX, which could be used as a format to store session information[10] until the version 7.4. It has been removed since from the base language, but still available through PECL.[11] The rationale was a lack of standardization of the format, and new formats like JSON more mainstream.[12] A vulnerability was fixed in 2007.[13]
Notes
- ^ Simeonov, Simeon. "WDDX: Distributed Data for the Web". Retrieved 2007-02-05.
- ^ Itoi, Nikki Goth (February 1999). "Syndicating the Web: Businesses are hoping that the ICE protocol will reduce the Web's content-sharing hassles". Red Herring. Archived from the original on October 13, 1999.
- ^ Udell, Jon (1999-06-07). "Exploring XML-RPC: DCOM? CORBA? RMI? Why Not Just XML-RPC?". Byte. Archived from the original on March 4, 2000. Retrieved 2015-11-17.
- ^ "WDDX White Paper by Jeremy Allaire".
- ^ "PHP: WDDX - Manual". www.php.net.
- ^ http://www.juretta.com/log/2007/01/31/rails_wddx_request/ Using WDDX with Ruby on Rails]
- ^ Using WDDX with Python
- ^ .NET plattform WDDX project
- ^ Using WDDX with Flex and AS3
- ^ Andrew Stopford, PHP Programming for Windows, Landmark, New Riders, 2002.
- ^ "PHP: Removed Extensions - Manual".
- ^ "PHP: RFC:deprecate-and-remove-ext-WDDX".
- ^ "Cve - Cve-2007-0908".
External links
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