ASP.NET 跨域

#region 支持跨域请求
            //Response.ClearHeaders();
            string origin = Request.Headers["Origin"];
            Response.AppendHeader("Access-Control-Allow-Origin",
                string.IsNullOrEmpty(origin) ? "*" : origin);
            string requestHeaders = Request.Headers["Access-Control-Request-Headers"];
            Response.AppendHeader("Access-Control-Allow-Headers",
                string.IsNullOrEmpty(requestHeaders) ? "*" : requestHeaders);
            Response.AppendHeader("Access-Control-Allow-Methods", "POST, OPTIONS");
            #endregion