Enable CORS in Web API 2

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CORS works absolutely fine in Microsoft.AspNet.WebApi.Cors version 5.2.2. The following steps configured CORS like a charm for me:

  1. Install-Package Microsoft.AspNet.WebApi.Cors -Version "5.2.2" // run from Package manager console

  2. In Global.asax, add the following line: BEFORE ANY MVC ROUTE REGISTRATIONS

    GlobalConfiguration.Configure(WebApiConfig.Register);

  3. In the WebApiConfig Register method, have the following code:

    public static void Register(HttpConfiguration config)
{
    config.EnableCors();
    config.MapHttpAttributeRoutes();
}

In the web.config, the following handler must be the first one in the pipeline:

<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

In the controller derived from ApiController, add the EnableCorsAttribute:

[EnableCors(origins: "*", headers: "*", methods: "*")] // tune to your needs
[RoutePrefix("")]
public class MyController : ApiController

That should set you up nicely!

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