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Last year I was working with a client who was using Adobe PDFs like no other and Adobe Flash Videos that were on multiple domains and finally found a good use for cross-domain.xml. It was not until then that I realized the importance of that file. Well, I’m working with that file again right now and I wanted to share this PDF regarding the policy to help anybody who has questions about it.
This post was based off of a post that I made on Forrst at, http://forr.st/~6RP.
A good snippet of what the cross-domain.xml file is used for comes from the HTML5BP:
A cross-domain policy file is an XML document that grants a web client—such as Adobe Flash Player, Adobe Reader, etc.—permission to handle data across multiple domains. When a client hosts content from a particular source domain and that content makes requests directed towards a domain other than its own, the remote domain would need to host a cross-domain policy file that grants access to the source domain, allowing the client to continue with the transaction. Policy files grant read access to data, permit a client to include custom headers in cross-domain requests, and are also used with sockets to grant permissions for socket-based connections. For full details, check out Adobe’s article about Cross-domain policy file specification (adobe.com/devnet/articles/…).
