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HTML5 Boilerplate homepage | Documentation table of contents

crossdomain.xml

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 the cross-domain policy file specification

Read the Cross-domain policy file specification

  • (PDF, 129 KB)
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