YUI recommends YUI3.
YUI 2 has been deprecated since 2011. This site acts as an archive for files and documentation.
This documentation is no longer maintained.
The YUI Connection Manager provides support for XMLHttpRequest transactions using a convenient interface normalized across the A-Grade browsers. Connection Manager also supports file uploads using the same interface.
All YUI 2.x users should review the YUI 2.8.2 security bulletin, which discusses a vulnerability present in YUI 2.4.0-2.8.1.
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