HttpClient，UseDefaultCredentials，Windows身份验证，.NET Core 2.0+控制台应用程序收到401未经授权

本文介绍了HttpClient，UseDefaultCredentials，Windows身份验证，.NET Core 2.0+控制台应用程序收到401未经授权的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试从.NET Core 3.0控制台应用程序进行HTTP GET调用。端点需要Windows身份验证。终结点是IIS上的一个生产中的.NET Framework 4.5.2 Web API服务，已成功被多个客户端应用程序使用。

I am trying to make an HTTP GET call from a .NET Core 3.0 console application. The endpoint expects Windows Authentication. The endpoint is an in-production .NET Framework 4.5.2 Web API service on IIS successfully used by several client applications.

我的测试程序成功运行 net45 框架目标。相比之下， netcoreapp3.0 内部版本收到401未经授权。

My test program succeeds for a net45 framework target. In contrast, the netcoreapp3.0 build receives a 401 Unauthorized.

这是我的方法：

using System; using System.Net; using System.Net.Http; using System.Net.Http.Headers; using System.Threading.Tasks; static async Task<string> Get(string serverUri, string requestUri) { var handler = new HttpClientHandler() { UseDefaultCredentials = true }; var client = new HttpClient(handler) { BaseAddress = new Uri(serverUri) }; return await client.GetStringAsync(requestUri); }

这是我的项目文件。

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <OutputType>Exe</OutputType> <TargetFrameworks>net45;netcoreapp3.0</TargetFrameworks> </PropertyGroup> <ItemGroup Condition="'$(TargetFramework)' == 'net45'"> <PackageReference Include="System.Net.Http" Version="4.3" /> </ItemGroup> </Project>

运行 。\bin\Debug\net45\HttpClientTest。 exe 返回预期的JSON结果。

Running .\bin\Debug\net45\HttpClientTest.exe returns the expected JSON result.

运行 dotnet .\bin\Debug\netcoreapp3.0＼ ＼HttpClientTest.dll 收到401未经授权。

Running dotnet .\bin\Debug\netcoreapp3.0\HttpClientTest.dll receives a 401 Unauthorized.

Unhandled exception. System.AggregateException: One or more errors occurred. (Response status code does not indicate success: 401 (Unauthorized).) ---> System.Net.Http.HttpRequestException: Response status code does not indicate success: 401 (Unauthorized). at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() at System.Net.Http.HttpClient.GetStringAsyncCore(Task`1 getTask) at ConsoleApp1.Program.Get(String serverUri, String requestUri) in C:\temp\coreapp3\Program.cs:line 16 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification) at System.Threading.Tasks.Task`1.get_Result() at ConsoleApp1.Program.Main(String[] args) in C:\temp\coreapp3\Program.cs:line 22

我该如何解决？

我也尝试了以下变体，但输出没有任何变化：

I have also tried the variations below, without any change in output:

handler.Credentials = CredentialCache.DefaultNetworkCredentials; handler.Credentials = CredentialCache.DefaultCredentials; handler.Credentials = new NetworkCredential(username, password, domain);

推荐答案

此变通办法适用于我，在创建HttpClient /之前将其添加处理程序：

This workaround works for me add this before creating HttpClient / Handler:

AppContext.SetSwitch("System.Net.Http.UseSocketsHttpHandler", false);