Use Cross Origin Resources (CORS) in ASP.NET Web API

As a security feature, AJAX prevents calls to resources that lives outside the current origin. Which means you can’t provide a service exposed by Web API to some origin. However, if you want to allow legitimate acces to a resource, this is where Cross Origin Resources (CORS) come in place.

CORS or Cross Engine Resource Sharing is a W3C standard that deals with the mechanism for making AJAX calls across various origins. ASP.NET Web API Supports CORS comes in the form of System.Web.Cors and System.Web.Http.Cors.
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