HttpRequestException - An existing connection was forcibly closed by the remote host

We have a web app calling a web service via API calls. We get the below error after creating a new record in that service.

Other code in our application seems to work ok, but for some reason, this particular issue is cropping up for this task only.

System.Net.Http.HttpRequestException HResult=0x80131620 Message=Error while copying content to a stream. Source=System.Net.Http StackTrace: at System.Net.Http.HttpContent.<LoadIntoBufferAsyncCore>d__52.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Net.Http.HttpClient.<FinishSendAsyncBuffered>d__62.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at AcidWebApp.Repositories.LitmusRepository.<CreateLitmus>d__6.MoveNext() in C:\Users\Mark\projects\AcidWebApp\Repositories\LitmusRepository.cs:line 83

Inner Exception 1: IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

Inner Exception 2: SocketException: An existing connection was forcibly closed by the remote host

We are using a helper class for this:

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;

namespace AcidWebApp.Helpers
{
    public interface IHttpClientHelper
    {
        Task<HttpClient> GetHttpClient(HttpContext httpContext);
        Task<HttpClient> GetHttpClient();
    }

    public class HttpClientHelper : IHttpClientHelper
    {
        private readonly string _apiUrl;
        private readonly IHttpContextAccessor _httpContextAccessor;

        public HttpClientHelper(string apiUrl, IHttpContextAccessor httpContextAccessor)
        {
            _apiUrl = apiUrl;
            _httpContextAccessor = httpContextAccessor;
        }

        public async Task<HttpClient> GetHttpClient(HttpContext httpContext)
        {
            var client = new HttpClient();
            var accessToken = await httpContext.GetTokenAsync("access_token");
            client.BaseAddress = new Uri(_apiUrl);
            client.SetBearerToken(accessToken);
            return client;
        }

        public async Task<HttpClient> GetHttpClient()
        {
            var client = new HttpClient();
            var accessToken = await _httpContextAccessor.HttpContext.GetTokenAsync("access_token");
            client.BaseAddress = new Uri(_apiUrl);
            client.SetBearerToken(accessToken);
            return client;
        }
    }
}

This is the implementation that has the issue:

public async Task<Litmus> CreateLitmus(Litmus litmus)
{
	var httpClient = await _httpClientHelper.GetHttpClient();
	var response = await httpClient.PostAsJsonAsync("Litmus", litmus);

	if (!response.IsSuccessStatusCode) return null;

	var result = response.Content.ReadAsStringAsync().Result;
	return JsonConvert.DeserializeObject<Litmus>(result);
}

[dustyghost]

Found the issue, there is a Newtonsoft.Json.JsonSerializationException: Self referencing loop detected this then closes the connection with an unhandled exception.

I know how to resolve that, as it’s our poor data design that is the cause. closing this issue

[dcarr42]

var result = response.Content.ReadAsStringAsync().Result;

That will not play nice when under load.