為 WebAPI 2 啟用 CORS

// Global.asax.cs calls this method at application start
public static void Register(HttpConfiguration config)
{
    // New code
    config.EnableCors();
}

//Enabling CORS for controller after the above registration
[EnableCors(origins: "http://example.com", headers: "*", methods: "*")]
public class TestController : ApiController
{
    // Controller methods not shown...
}