Connection reset issue in ASP.NET Core Web API call (net::ERR_CONNECTION_RESET 200 (OK))

I have an ASP.NET Core Web API service which is called from an 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 get this 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. It's also returning the result.

This is how entire flow works

1. 
   Client side call performs by user
   
   this.dataservice.postFeed(method, JSON.stringify(this.initsearch)).subscribe(result => {
   var response = result.body["data"];
   console.log(response);
   });
2. 
   Server side code looks like
   
   [HttpPost]
   public async Task<IActionResult> Post([FromBody] ObjectModel searchValue)
   {
   ApiResponse<string> response = new ApiResponse<string>();
   IBaseResult<string> result = await _adlerBo.GetPaymentStatus(searchValue);
   
   response.Success = result.success;
   response.Data = result.Data;
   
   return Ok(response);
   }

In BusinessObject.cs:

public async Task<IBaseResult<string>> GetPaymentStatus(PaymentSearchModel requestModel){
string apiResponse = await PaymentStatusCheckUsingAPI(requestModel.orderid);
return apiResponse ;
}

private async Task<string> PaymentStatusCheckUsingAPI(string orderNumber)
{
string message = await PostPaymentRequestToGateway(statusApiUrl, authQueryUrlParam);
NameValueCollection param = await 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))
{
status = param;
}

if ("enc_response".Equals(param.Keys))
{
encResJson = param;
}
}

if (!"".Equals(status) && status.Equals("0"))
{
resJson = crypto.Decrypt(encResJson, workingKey);
}
else if (!"".Equals(status) && status.Equals("1"))
{
Console.WriteLine("failure response: " + encResJson);
}
}

return resJson;
}

private async Task<string> PostPaymentRequestToGateway(string queryUrl, string urlParam)
{
string message = "";

try
{
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 = await sr.ReadToEndAsync();
//Response.Write(message);
}
}
catch (Exception exception)
{
Console.Write("Exception occurred while connection." + exception);
}

return message;
}

private async Task<NameValueCollection> GetResponseMap(string message)
{
//await Task.Delay(2000); I did this with no Luck

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 await Task.FromResult(Params);
}


Any idea how to fix this? Why its working when I put breakpoint and not otherwise.

Am I doing correct asynchronous implementation in my API ?

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