HttpClient,UseDefaultCredentials,Windows身份验证,.NET Core 2.0控制台应用程序接收401 Unauthorized

Question

我正在尝试从.NET Core 2.0控制台应用程序进行HTTP GET调用.端点需要Windows身份验证.

我的测试程序成功实现了net45框架目标.相比之下,netcoreapp3.0构建接收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.

跑步dotnet .\bin\Debug\netcoreapp3.0\HttpClientTest.dll收到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？

我也尝试过以下变化,输出没有任何变化:

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

Answer 1

因此，我们在 HttpClient 上遇到了同样的问题，但在第一个请求上它是未经授权的，但如果我们进行另一个快速请求调用，它会顺利进行，并且我们会获得授权。

如果我在 .NET 4.7.1 控制台应用程序上执行此操作，则效果完美。如果我在 .NET 4.7.1 空 Web 应用程序中执行此操作，则它工作正常，只有当我执行 .NET Core 2.x 时，我们才会遇到此问题。

var result = string.Empty;
var responseMessage = _client.GetAsync(url).Result;

if (responseMessage.IsSuccessStatusCode)
{
    result = await responseMessage.Content.ReadAsStringAsync();
}
else
{
    var responseMessage2 = _client.GetAsync(url).Result;

    if (responseMessage2.IsSuccessStatusCode)
    {
        result = await responseMessage2.Content.ReadAsStringAsync();
    }
}

return result;