Cross-origin resource sharing (CORS) is a World Wide Web Consortium (W3C) specification (commonly considered part of HTML5) that lets JavaScript overcome the same-origin policy security restriction imposed by browsers. The same-origin policy means that your JavaScript can only make AJAX calls back to the same origin of the containing Web page (where "origin" is defined as the combination of host name, protocol and port number). For example, JavaScript on a Web page from http://foo.com can't make AJAX calls to http://bar.com (or to http://www.foo.com, https://foo.com or http://foo.com:999, for that matter). CORS relaxes this restriction by letting servers indicate which origins are allowed to call them. CORS is enforced by browsers but must be implemented on the server, and the most recent release of ASP.NET Web API 2 has full CORS support. With Web API 2, you can configure policy to allow JavaScript clients from a different origin to access your APIs.


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