| [HTML5 Boilerplate homepage](http://html5boilerplate.com) | [Documentation | |
| table of contents](README.md) | |
| # 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](http://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html) | |
| Read the [Cross-domain policy file | |
| specification](http://learn.adobe.com/wiki/download/attachments/64389123/CrossDomain_PolicyFile_Specification.pdf?version=1) | |
| - (PDF, 129 KB) | |