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

【问题标题】：HttpClient, Azure and System.Net.Sockets.SocketException: what to do?HttpClient、Azure 和 System.Net.Sockets.SocketException：怎么办？
【发布时间】：2021-11-09 04:33:33
【问题描述】：

我们在 Azure 中的一个 Web 应用程序上遇到了很多问题，它使用 HttpClient 对端点进行远程调用。

我知道这是 Azure 中的出站连接限制问题，因此我只使用一个具有单例模式的 HttpClient 实例重构了代码。

这是我的助手：

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;
    }
}

比我调用 SingleRead()（用于 GET）或 PostRead()（用于 POST）的基本请求。

问题是，有时我仍然会收到 SocketException：

这是全栈跟踪：

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)

这是异常堆栈跟踪：

   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

我不知道问题出在哪里。 出站连接现在低于服务计划（即“S3 : 2”）。

SNAT 似乎远远低于限制：

出站连接也是如此：

（注意：我昨天 21:30 已将 3 个实例的大小调整为 2 个，这就是为什么那些绿色“下降”的原因）。

我真的不明白发生了什么。环境设置正确。

有什么线索吗？

编辑 这是添加建议的 IHttpClientFactory 的版本（即编辑）：

// 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);
    }
    
    // ...
}

仍然无法正常工作，并且我收到了相同的错误套接字消息。这是一个完整的例子：

{
    "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
}

【问题讨论】：

  • 这样使用HttpClient是错误的。无需创建自己的类，而是使用 HttpClientFactory 和services.AddHttpClient 来根据需要配置、注册和回收 SocketHttpClientHandler 实例。使用单个 HttpClient 实例可以避免套接字耗尽但是如果有任何 DNS 或负载均衡器更改，缓存的套接字将指向一个不存在的服务器
  • 您使用的是哪个 .NET (Core) 版本？ GetFromJsonAsync 和 PostAsJsonAsync 之类的方法可以帮助删除大部分（如果不是全部）额外代码
  • 您也可以在AddHttpClientusing named or typed HttpClients和Polly中配置API密钥并重试登录。
  • @PanagiotisKanavos 我正在使用 .NET Core 2.2。我可以切换到 HttpClientFactory，但确定这是问题所在？
  • 检查Use IHttpClientFactory to implement resilient HTTP requests。所描述的问题正是您遇到的。此外，通过减少自定义代码来解决问题总是更容易，特别是如果它复制了内置功能。正如文章所解释的，使用 HttpClientFactory 允许使用重试逻辑。由于多种原因，HTTP 调用总是会失败

标签： c# azure httpclient .net-core-2.2


【解决方案1】：

尝试 1：在您的应用中最多可以使用 IHttpClientFactory 来实现弹性 HTTP 请求（请参阅：https://docs.microsoft.com/en-us/dotnet/architecture/microservices/implement-resilient-applications/use-httpclientfactory-to-implement-resilient-http-requests）。

尝试 2：当您横向扩展端点（如果它在您的控制范围内）时，您的所有实例上都有一个负载均衡器，因此流量会在它们之间自动进行负载均衡。也许您需要更好的负载平衡解决方案（请参阅：https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/load-balancing-overview）。

尝试 3：如果您的应用在单台机器上运行更好，您应该扩大并使用每个应用的缩放（请参阅：https://docs.microsoft.com/en-us/azure/app-service/manage-scale-per-app）

尝试 4：解决 Azure 应用服务中的间歇性出站连接错误（请参阅：https://docs.microsoft.com/en-us/azure/app-service/troubleshoot-intermittent-outbound-connection-errors）

P.S.：一个疯狂的猜测是端点无法处理来自您的 3 个实例的不断增加的请求（当使用通过 HttpClientHandler.MaxConnectionsPerServer 设置的 HttpClient 对象发出请求时，一个实例的并发连接限制为 256 个（每个服务器端点））财产）;这就是为什么当你减少实例数量时它会表现得更好

【讨论】：

  • “如果您的应用在单一服务计划上运行得更好”是什么意思？它当然在服务计划内。在这种情况下，一个应用程序，有 2 个插槽（我在一个特定的插槽上使用它）。
  • 可能是 Azure 问题。您的应用程序在标准服务计划上运行，当实例数量增加时，问题似乎出现（变得更糟）。所以我会尝试使用高级服务计划并尝试（使用每个应用程序扩展）在同一个服务计划上拥有多个实例。也许标准服务计划的负载平衡不是很好
  • 为什么溢价会更好？现在我在同一个服务计划上有多个实例，如果我将“手动实例”设置为高于 1 的值，对吗？
  • 对不起，我想说的是同一台机器；当您向外扩展（比如说 3 个实例）时，在您的服务计划后面有 3 台机器，每台运行您的应用程序的一个实例；如果您需要将在同一服务计划上运行的其他应用程序扩展到 3，通过每个应用程序扩展，您可以控制此应用程序可以拥有多少个实例（其他应用程序将保留为 3 个实例），或者您应该尝试 p2v2： 2 服务计划
  • 问题又回来了 :( 即使在应用服务计划 (S3:1) 上有 1 个实例，它只包含单个应用程序（在 3 个不同的插槽上）。我真的不知道如何做更多...！那个槽会不会给其他人带来问题？
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