Crossdomain.xml

Adobe Flash 播放器可以创建从公共服务和APIS上加载数据的应用。Flash可以依据一个许可规则（许可来自与服务器）来加载跨域的数据，这种方式是通过在服务器上放置一个名称为crossdomain.xml的文件来区分哪些flash可以访问其服务。
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From：http://www.crossdomainxml.org/
Adobe Flash Player can be used to create applications that load data from public services and APIs. Flash can load data across domains on a permission basis (permission from the server). This is done by the server having a small crossdomain.xml file that specifies whether Flash can connect to services on that server.

Leading Sites using Crossdomain.xml:

Yahoo! - http://api.search.yahoo.com/crossdomain.xml

YouTube.com - http://www.youtube.com/crossdomain.xml

Flickr.com - http://api.flickr.com/crossdomain.xml

Amazon.com - http://www.amazon.com/crossdomain.xml

Example crossdomain.xml file:

<?xml version="1.0"?> <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy> <allow-access-from domain="*" /> </cross-domain-policy></body></html></body></html>