Routing in ASP.NET Web API | The ASP.NET Site

To allow multiple HTTP methods for an action, or to allow HTTP methods other than GET, PUT, POST, and DELETE, use the AcceptVerbs attribute, which takes a list of HTTP methods.

public class ProductsController : ApiController
{
    [AcceptVerbs("GET", "HEAD")]
    public Product FindProduct(id) { }

    // WebDAV method
    [AcceptVerbs("MKCOL")]
    public void MakeCollection() { }
}