Prevent all non GET/POST requests in a base controller class in asp mvc

OnActionExecuting.cs

        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            string httpMethod = filterContext.RequestContext.HttpContext.Request.HttpMethod.ToUpper();

            // Prevent all non GET/POST requests
            if (httpMethod != "GET" && httpMethod != "POST")
            {
                filterContext.Result = new HttpStatusCodeResult(404);
                return;
            }
            else
            {
                base.OnActionExecuting(filterContext);
            }
        }