I have a .net core API service which is called from a angular client project.

When a user request a status of his payment, we will make call to this service api and this service will then call a payment gateway service to fetch the status of payment and the output result will return to the user.

When i try to integrate this i am facing this below error.

net::ERR_CONNECTION_RESET 200 (OK)
core.js:5967 ERROR Unknown Error

This above issue is not showing when i try to hit the service after putting one breakpoint. Its also returning the result.

This is how entire flow works

Client side call performs by user

this.dataservice.postFeed(method, JSON.stringify(this.initsearch)).subscribe(result => {
var response = result.body["data"];
console.log(response);

[HttpPost]
[ProducesResponseType(typeof(int), 401)]
[ProducesResponseType(typeof(int), 400)]
[ProducesResponseType(typeof(string), 500)]
public async Task<IActionResult> Post([FromBody] PaymentSearchModel searchValue)

           ApiResponse<string> response = new ApiResponse<string>();
           if (searchValue != null)
               searchValue.searchcode = "1";//setting for the time being for auditing purpose
               string result = await _adlerBo.GetPaymentStatus(searchValue);
               response.Success = true;
               response.Data = result;
               return Ok(response);
               return StatusCode(StatusCodes.Status400BadRequest, "No required values submitted");
       catch (Exception ex)
           return StatusCode(StatusCodes.Status500InternalServerError, "There was a problem in retreiving the data");
private async Task<string> GetPaymentStatus(PaymentSearchModel requestModel)  

string result = string.Empty;
           AdlerCCAvenue adlerCCAvenue = new AdlerCCAvenue();
           StatusAPIResponseModel objResponseModel = new StatusAPIResponseModel();
           //switch (requestModel.searchcode) {
           //    case "1"://search using order  id
           //        adlerCCAvenue = await _adlerDao.GetAvenuePaymentDetails(requestModel.searchcode,requestModel.orderid);
           //        break;
           //START Check Payment Status
           //if (adlerCCAvenue != null && adlerCCAvenue.PaymentId > -1)
           string apiResponse = await PaymentStatusCheckUsingAPI(requestModel.orderid);
           await Task.Delay(10000);
           if (!string.IsNullOrEmpty(apiResponse))
               result = apiResponse;
           //END
       catch (Exception ex)
           _appLogger.CreateLog("GetPaymentStatus - " + ex);
       return result;
private async Task<string> PaymentStatusCheckUsingAPI(string orderNumber)  

string resJson = string.Empty;
        string accessCode = _configuration["Avenue:accessCode"];
        string workingKey = _configuration["Avenue:workingkey"];
        string statusApiUrl = _configuration["Avenue:status_api_url"];
        //string orderStatusQueryJson = "{ \"reference_no\":\"\", \"order_no\":\"" + orderNumber + "\" }"; //Ex. { "reference_no":"CCAvenue_Reference_No" , "order_no":"123456"}
        string orderStatusQueryJson = "{ \"order_no\":\"" + orderNumber + "\" }"; //Ex. { "reference_no":"CCAvenue_Reference_No" , "order_no":"123456"}
        string encJson = "";
        CCACrypto ccaCrypto = new CCACrypto();
        encJson = ccaCrypto.Encrypt(orderStatusQueryJson, workingKey);
        // make query for the status of the order to ccAvenues change the command param as per your need
        ////string authQueryUrlParam = "enc_request=" + encJson + "&access_code=" + accessCode + "&command=orderStatusTracker&request_type=JSON&response_type=JSON";
        // Url Connection
        ////string message = PostPaymentRequestToGateway(statusApiUrl, authQueryUrlParam);
        string message = await PostPaymentRequestToGateway(statusApiUrl, encJson, accessCode);
        NameValueCollection param = GetResponseMap(message);
        string status = "";
        string encResJson = "";
        if (param != null && param.Count == 2)
            for (int i = 0; i < param.Count; i++)
                if ("status".Equals(param.Keys[i]))
                    status = param[i];
                if ("enc_response".Equals(param.Keys[i]))
                    encResJson = param[i];
            if (!"".Equals(status) && status.Equals("0"))
                resJson = ccaCrypto.Decrypt(encResJson, workingKey);
            else if (!"".Equals(status) && status.Equals("1"))
                //Console.WriteLine("failure response from ccAvenues: " + encResJson);
    catch (Exception exp)
        _appLogger.CreateLog("PaymentStatusCheckUsingAPI - " + exp);
    return resJson;
private async Task<string> PostPaymentRequestToGateway(string queryUrl, string urlParam,string accessCode)  

string message = "";  

using (HttpClient client = new HttpClient())  

var parameters = new Dictionary<string, string> { { "enc_request", urlParam },  

{ "access_code", accessCode },  

{ "command", "orderStatusTracker" },{"request_type", "JSON" },{"response_type", "JSON" }};
             var encodedContent = new FormUrlEncodedContent(parameters);
             HttpResponseMessage response = await client.PostAsync(queryUrl, encodedContent);
             response.EnsureSuccessStatusCode();
             string responseBody = await response.Content.ReadAsStringAsync();
             message = responseBody;
         //    StreamWriter myWriter = null;// it will open a http connection with provided url
         //WebRequest objRequest = WebRequest.Create(queryUrl);//send data using objxmlhttp object
         //objRequest.Method = "POST";
         ////objRequest.ContentLength = TranRequest.Length;
         //objRequest.ContentType = "application/x-www-form-urlencoded";//to set content type
         //myWriter = new System.IO.StreamWriter(objRequest.GetRequestStream());
         //myWriter.Write(urlParam);//send data
         //myWriter.Close();//closed the myWriter object
         //// Getting Response
         //System.Net.HttpWebResponse objResponse = (System.Net.HttpWebResponse)objRequest.GetResponse();//receive the responce from objxmlhttp object
         //using (System.IO.StreamReader sr = new System.IO.StreamReader(objResponse.GetResponseStream()))
         //    message = sr.ReadToEnd();
     catch (Exception exception)
         Console.Write("Exception occured while connection." + exception);
     return message;
private NameValueCollection GetResponseMap(string message)  

//await Task.Delay(2000);
       NameValueCollection Params = new NameValueCollection();
       if (message != null || !"".Equals(message))
           string[] segments = message.Split('&');
           foreach (string seg in segments)
               string[] parts = seg.Split('=');
               if (parts.Length > 0)
                   string Key = parts[0].Trim();
                   string Value = parts[1].Trim();
                   Params.Add(Key, Value);
       return Params;
												
If you look at the requests in the Network tab of your browser's dev tools for the AJAX request does it highlight any issues? I'm wondering if it's working locally because of a self-signed SSL certificate, but in production the app's certificate may not be valid (probably also worth checking the Security tab too.)  
That doesn't explain why adding a 10s delay bypasses the issue, but it's worth eliminating.
												
Hi @Nidhin Paul  ,    
Please check the request url, whether it is a Http request or a Https request. According to my experience, if you configure the application to use an https request, but the request url is an http request. Therefore, it may cause net::ERR_CONNECTION_RESET error. If that is the case, try to change the request url start with https.