我有一个使用 Microsoft Graph 访问邮箱的应用程序。它可以在 Windows 10 的开发机器上运行。 在服务器中，我收到以下错误。 （Windows 服务器 2016 和 Windows 服务器 2012）
“System.Net.Http.HttpRequestException：发送请求时发生错误。---> System.Net.Http.WinHttpException：调用WINHTTP_CALLBACK_STATUS_REQUEST_ERROR时出现错误12002，'操作超时'。”
详细错误：
Status Code: 0
Microsoft.Graph.ServiceException: Code: generalException
Message: An error occurred sending the request.
---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.Http.WinHttpException: Error 12002 calling WINHTTP_CALLBACK_STATUS_REQUEST_ERROR, 'The operation timed out'.
at System.Threading.Tasks.RendezvousAwaitable`1.GetResult()
at System.Net.Http.WinHttpHandler.<StartRequestAsync>d_122.MoveNext()
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.RedirectHandler.<SendAsync>d6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.RetryHandler.<SendAsync>d9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.CompressionHandler.<SendAsync>d2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.AuthenticationHandler.<SendAsync>d16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.HttpProvider.<SendRequestAsync>d19.MoveNext()
--- End of inner exception stack trace ---
at Microsoft.Graph.HttpProvider.<SendRequestAsync>d19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.HttpProvider.<SendAsync>d18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.BaseRequest.<SendRequestAsync>d40.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.BaseRequest.<SendAsync>d34`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Graph.MailFolderMessagesCollectionRequest.<GetAsync>d_3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
我一直在追踪完全相同的问题，发现我们的机器有一个使用 netsh 配置的代理，但代理服务器不可用。所以“操作超时”100%有效。
您可以通过从命令提示符调用“netsh winhttp show proxy”进行检查。我们的代理来自较旧的测试场景，因此我们只需从管理命令提示符中使用“netsh winhttp重置代理”将其清除。
我认为这只会在升级 Microsoft.Graph nuget 包后在我们的服务器上出现问题。也许它已被“改进”以遵循系统范围的代理服务器配置。
这也解释了为什么我无法让 Fiddler 跟踪适用于 Graph API 调用，但它适用于 MSAL 身份验证调用。