Windows 服务和控制台应用程序中的 System.Net.Http 不同行为

问题描述

我正在尝试创建在计时器上执行 HTTP 请求的 Windows 服务。在生产中部署应用程序后，我注意到某些端点无法接收数据。手动检查后，我当然知道我可以 ping，向该端点发出 POST 请求。

我注意到，如果我在相同的 .NET 4.7.2 版本上运行完全相同的代码，控制台应用程序会成功，而 Windows 服务 - 不会。它抛出这个异常：

控制台应用程序：

using (HttpClient httpClient = new HttpClient())
 {
     httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic","xxxxxxxxxxxxxxx");
     var content = new StringContent(JsonSerializer.Serialize(data),Encoding.UTF8,"application/json");
     Console.WriteLine(await content.ReadAsstringAsync());
     var response = await httpClient.PostAsync("http://xx.xx.xx.xx:8080/zzz/xx.svc/InsertData",content);
     Console.WriteLine(response.StatusCode);
}

Windows 服务：

using (HttpClient httpClient = new HttpClient())
{
    httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(endpoint.AuthScheme,endpoint.AuthKey);
    var content = new StringContent(JsonSerializer.Serialize(data),"application/json");
                        try
                        {
                            var response = await httpClient.PostAsync(endpoint.UrlAddress,content);
                            response.EnsureSuccessstatusCode();
                            logger.Info($"Duomenys perduoti gavėjui:{endpoint.Name}");
                        }
                        catch (Exception ex)
                        {
                            logger.Warn($"Nepavyko perduoti duomenų šaltiniui: {endpoint.Name}; Adresas:{endpoint.UrlAddress}; Duomenų kiekis:{endpoint.Tags.Count}",ex);
                        }   
}

异常：

System.Net.Http.HttpRequestException: An error occurred while sending the request. 
---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. 
---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt Failed because the connected party did not properly respond after a period of time,or established connection Failed because connected host has Failed to respond. 
---> System.Net.sockets.socketException: A connection attempt Failed because the connected party did not properly respond after a period of time,or established connection Failed because connected host has Failed to respond
   at System.Net.sockets.socket.EndReceive(IAsyncResult asyncResult)
   at System.Net.sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   at System.Net.PooledStream.EndRead(IAsyncResult asyncResult)
   at System.Net.Connection.ReadCallback(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.httpclienthandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at historianPusher.Service.<Timer_Elapsed>d__5.MoveNext() in C:\Users\alaburda_e\source\repos\historianPusher\historianPusher\Service.cs:line 120

我可以保证我检查了地址、身份验证密钥、方案 - 一切都 100% 匹配。我已禁用代理、防火墙。

服务安装程序配置：

            // 
            // serviceProcessInstaller1
            // 
            this.serviceProcessInstaller1.Account = System.ServiceProcess.ServiceAccount.LocalSystem;
            this.serviceProcessInstaller1.Password = null;
            this.serviceProcessInstaller1.Username = null;
            // 
            // serviceInstaller1
            // 
            this.serviceInstaller1.ServiceName = "historian Pusher";
            this.serviceInstaller1.displayName = "historian Pusher";
            this.serviceInstaller1.Description = "Procesas skirtas perduoti historian duomenis į išorinius šaltinius naudojantis HTTP/HTTPS protokolu";
            this.serviceInstaller1.StartType = System.ServiceProcess.ServiceStartMode.Automatic;

解决方法

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c#c#system.net.httpwebrequest system.net.webexception