Question

我有一个ASP.Net核心Wep API项目，它执行以下任务：

通过名为ProcessController的控制器接收请求。
获取传入的请求并将数据格式化为字符串。
使用以下HttpProcessor类中的PostChargeAsync方法在URL上发布上述格式化消息，并等待响应消息执行进一步处理。

注意 HttpClient是使用IoC注入的，是一个单例。

public class HttpProcessor
{
    private readonly HttpClient _httpClient;

    public HttpProcessor(HttpClient httpClient)
    {
        _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));            
    }

    public async Task<string> PostChargeAsync(string payload)
    {
        using (var httpRequest = BuildHttpRequest(payload))
        {
            try
            {
                using (var httpResponse = await _httpClient.SendAsync(httpRequest).ConfigureAwait(false))
                {
                    httpResponse.EnsureSuccessStatusCode();

                    using (var httpContent = httpResponse.Content)
                    {
                        return await httpContent.ReadAsStringAsync();
                    }
                }
            }
            catch (HttpRequestException ex)
            {
                throw;
            }
            catch (TimeoutException ex)
            {
                throw;
            }
            catch (System.Exception ex)
            {
                throw;
            }
        }
    }

    private HttpRequestMessage BuildHttpRequest(string content)
    {
        return new HttpRequestMessage
        {
            Content = new StringContent(content, Encoding.UTF8, "application/xml"),
            Method = HttpMethod.Post,
            RequestUri = new Uri("https://test/process"),
        };
    }
}

问题是当在ProcessController上发送并行请求（~30 - 50个请求/分钟）并调用PostChargeAsync方法时，我得到以下异常：

System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.Http.WinHttpException: The connection with the server was terminated abnormally

我尝试在Web.Config中添加以下设置以增加connectionManagement中的maxconnection：

  <system.net>
    <connectionManagement>
      <add address="*" maxconnection="100"/>
    </connectionManagement>
  </system.net>

但我仍然得到上述异常。

任何想法会导致上述问题？

Answer 1

我们从HttpClient转移到了HttpWebRequest，上面提到的问题已经解决了。 HttpClient在.Net Core Runtime 2.0上存在一些问题。请注意，在创建此帖子时，我使用的是.NET Core SDK 2.1.4和.NET Core Runtime 2.0.5。

WinHttpException：与服务器的连接异常终止

1 个答案: