加载资源失败：服务器响应状态为 500（内部服务器错误）

Question

i had build a web form with autocomplete method, the program is working fine in IDE. But after i publish the application to IIS, the method is not working. the console show this error `failed to load resouces: server response with a status 500(internal server error) Index2). Im suspected the jquery code didn't recognize the controller name. CSHTML

<script type="text/javascript">
    $(document).ready(function () {
        $("#CardName").autocomplete({
            source: function (request, response) {
                $.ajax({
                    url: "Index2",
                    type: "POST",
                    dataType: "json",
                    data: { Prefix: request.term },
                    success: function (data) {
                        response($.map(data, function (item) {
                            return { label: item.CardName, value: item.CardId };
                        }))

                    }
                })
            },
            messages: {
                noResults: "", results: ""
            }
        });
    })
</script>

Controller

[HttpPost]
        public JsonResult Index2(string Prefix)
        {
            List<CardHolderDetails> getCardList = new List<CardHolderDetails>();
            getCardList = _service.getCardList();
            List<CardHolderDetails> ObjList = new List<CardHolderDetails>();
            foreach (var value in getCardList)
            {
                ObjList.Add(new CardHolderDetails { CardId = value.CardId, CardName = value.CardName });

            }

            //Searching records from list using LINQ query
            var CardName= (from N in ObjList
                            where N.CardName.StartsWith(Prefix)
                            select new { N.CardName, N.CardId });
            return Json(CardName, JsonRequestBehavior.AllowGet);
        }

The following code it is working fine during the development, but once publish to IIS it seem the jquery url cannot be read. any replacement for URL to controller function name?

Answer 1

If your _service.getCardList() returns null then the foreach will throw an exception which you have not handled.

Maybe that is the reason you are getting (500) internal server error and not the jquery url , as 500 error code suggests that something went wrong in the server code.

As a suggestion, You should use implement try - catch and log the exceptions somewhere to be able to resolve such issues.

Answer 2

https://github.com/Rotimi-28/book-search-engine

Failed to load resource: the server responded with a status of 500 (Internal Server Error)