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HttpClient、Azure 和 System.Net.Sockets.SocketException：怎么辦？

[英]HttpClient, Azure and System.Net.Sockets.SocketException: what to do?

 原文  2021-11-05 08:12:00  6   1    c#/ azure/ httpclient/ .net-core-2.2

問題描述

我們在 Azure 中的 Web 應用程序上遇到了很多問題，它使用 HttpClient 對端點進行遠程調用。

我知道這是 Azure 中出站連接限制的問題，因此我僅使用一個具有單例模式的 HttpClient 實例重構了代碼。

這是我的幫手：

public class HttpClientHelper
{
    string ApiKey = "";
    static HttpClient httpClient;
    
    public HttpClientHelper(IConfiguration config)
    {            
        var appsettings = config.GetSection("AppSettings");
        ApiKey = appsettings.GetChildren().Where(x => x.Key == "URL").FirstOrDefault().Value;
        
        if (httpClient == null)
        {
            httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Add("Authorization", ApiKey);
        }
    }

    public async Task<T> SingleRead<T>(string baseAddress, string url)
    {
        T returnValue = default(T);
        
        try
        {
            var response = await httpClient.GetAsync($"{baseAddress}/{url}").ConfigureAwait(false);
            if (response.IsSuccessStatusCode)
            {
                var r = await response.Content.ReadAsStringAsync();
                returnValue = JsonConvert.DeserializeObject<T>(r);
            }
            else
            {
                Log($"SingleRead failed, error: {JsonConvert.SerializeObject(response)}");
            }
        }
        catch (Exception ex)
        {
            Log(ex, $"SingleRead ex: {baseAddress}/{url}");
            throw ex;
        }

        return returnValue;
    }

    public async Task<T> PostRead<T>(string baseAddress, string url, object entity = null)
    {
        T returnValue = default(T);            

        try
        {
            string json = JsonConvert.SerializeObject(entity);
            var body = new StringContent(json, UnicodeEncoding.UTF8, "application/json");
            var response = await httpClient.PostAsync($"{baseAddress}/{url}", body).ConfigureAwait(false);
            if (response.IsSuccessStatusCode)
            {
                var r = await response.Content.ReadAsStringAsync();
                returnValue = JsonConvert.DeserializeObject<T>(r);
            }
            else
            {
                Log($"PostRead failed, error: {JsonConvert.SerializeObject(response)}");
            }
        }
        catch (Exception ex)
        {
            Log(ex, $"PostRead url: {baseAddress}/{url} entity: {JsonConvert.SerializeObject(entity)}");
            throw ex;
        }

        return returnValue;
    }
}

比我做的基本請求調用 SingleRead()（用於 GET）或 PostRead()（用於 POST）。

問題是，有時我仍然會收到 SocketException：

在此處輸入圖片說明

這是完整的堆棧跟蹤：

System.Net.Http.HttpRequestException:
   at MobilityServer.Helpers.HttpClientHelper+<PostRead>d__4`1.MoveNext (MobilityServer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null: c:\MyProject\WebApp\Helpers\HttpClientHelper.cs:77)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at MobilityServer.Helpers.MigrationHelper+<GetLdcHeaders>d__8.MoveNext (MobilityServer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null: c:\MyProject\WebApp\Helpers\MigrationHelper.cs:54)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at MobilityServer.Controllers.AndroidController+<GetLdcHeaders>d__8.MoveNext (MobilityServer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null: c:\MyProject\WebApp\Controllers\BasicController.cs:104)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor+TaskOfIActionResultExecutor+<Execute>d__0.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Threading.Tasks.ValueTask`1.get_Result (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ValueTaskAwaiter`1.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeActionMethodAsync>d__12.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeNextActionFilterAsync>d__10.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeInnerFilterAsync>d__13.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeNextResourceFilter>d__23.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeFilterPipelineAsync>d__18.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeAsync>d__16.MoveNext (Microsoft.AspNetCore.Mvc.Core, Version=2.2.10.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware+<Invoke>d__3.MoveNext (Microsoft.AspNetCore.Routing, Version=2.2.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware+<Invoke>d__6.MoveNext (Microsoft.AspNetCore.Routing, Version=2.2.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__7.MoveNext (Microsoft.AspNetCore.Diagnostics, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60)
Eccezione interna System.Net.Sockets.SocketException gestita in MobilityServer.Helpers.HttpClientHelper+<PostRead>d__4`1.MoveNext:
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Net.Http.ConnectHelper+<ConnectAsync>d__2.MoveNext (System.Net.Http, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a)

這是異常堆棧跟蹤：

   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at MobilityServer.Helpers.HttpClientHelper.PostRead[T](String baseAddress, String url, Object entity) in c:\MyProject\WebApp\Helpers\HttpClientHelper.cs:line 63

我不明白問題出在哪里。 現在出站連接低於服務計划（即“S3：2”）。

SNAT 似乎遠遠低於限制：

在此處輸入圖片說明

出站連接也是如此：

在此處輸入圖片說明

（注意：我昨天在 21:30 從 3 個實例調整到 2 個實例，這就是為什么那些綠色的“下降”）。

我真的搞不懂這是怎么回事。 環境相同正確設置。

有什么線索嗎？

編輯這是添加建議的 IHttpClientFactory 的版本（即編輯）：

// Startup.cs
public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);            
    services.AddApplicationInsightsTelemetry(Configuration["APPINSIGHTS_CONNECTIONSTRING"]);
    services.AddHttpClient<MigrationHelper>();
}

public class MigrationHelper
{
    HttpClientHelper httpc;

    public MigrationHelper(IConfiguration config, HttpClient httpClient)
    {
        // ...
        
        httpc = new HttpClientHelper(config, httpClient);
    }
}

public class HttpClientHelper
{
    string ApiKey = "";
    HttpClient httpClient;
    
    public HttpClientHelper(IConfiguration config, HttpClient _httpClient)
    {
        var appsettings = config.GetSection("AppSettings");
        ApiKey = appsettings.GetChildren().Where(x => x.Key == "URL").FirstOrDefault().Value;
        
        httpClient = _httpClient;
        httpClient.DefaultRequestHeaders.Add("Authorization", ApiKey);
    }
    
    // ...
}

仍然不起作用，我收到了同樣的錯誤 Socket 消息。 這是一個完整的例子：

{
    "Message": "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",
    "Data": {},
    "InnerException": {
        "ClassName": "System.Net.Sockets.SocketException",
        "Message": "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",
        "Data": null,
        "InnerException": null,
        "HelpURL": null,
        "StackTraceString": " at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)",
        "RemoteStackTraceString": null,
        "RemoteStackIndex": 0,
        "ExceptionMethod": null,
        "HResult": -2147467259,
        "Source": "System.Private.CoreLib",
        "WatsonBuckets": null,
        "NativeErrorCode": 10060
    },
    "StackTrace": " at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)\r\n at System.Threading.Tasks.ValueTask`1.get_Result()\r\n at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Threading.Tasks.ValueTask`1.get_Result()\r\n at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)\r\n at System.Threading.Tasks.ValueTask`1.get_Result()\r\n at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)\r\n at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)\r\n at MobilityServer.Helpers.HttpClientHelper.PostRead[T](String baseAddress, String url, Object entity) in c:\\MyProject\\WebApp\\Helpers\\HttpClientHelper.cs:line 60",
    "HelpLink": null,
    "Source": "System.Net.Http",
    "HResult": -2147467259
}

1 個解決方案

解決方案1
 0  2021-11-08 09:31:15

嘗試 1：您可以在應用程序中執行的最大操作是使用 IHttpClientFactory 來實現彈性 HTTP 請求（請參閱： https ://docs.microsoft.com/en-us/dotnet/architecture/microservices/implement-resilient-applications/use -httpclientfactory-to-implement-resilient-http-requests ）。

嘗試 2：當您向外擴展時，所有實例都有一個負載均衡器，因此，它們之間的流量會自動進行負載均衡。 也許您需要一個更好的負載平衡解決方案（請參閱： https : //docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/load-balancing-overview ）。

嘗試 3：如果您的應用在單一服務計划上運行得更好，您應該向上擴展並使用每個應用擴展（請參閱： https : //docs.microsoft.com/en-us/azure/app-service/manage-scale - 每個應用程序）

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