Attribute used to limit the locations where your API or Action can be called from. to a singe resourceNamespace: Walter.Web.FireWall.Annotations
Assembly: Walter.Web.FireWall (in Walter.Web.FireWall.dll)
Very must similar to cross site attribute and filter only this is not site but resource relevant and can be used to limit access. This method is ideal when you share views and pages in embedded resources but only allow access to a script or action when the page requesting the resource is listed in the pages allowed to request the endpoint.