如何注册将验证域用户的 HttpClient

Question

我必须将 HttpClient 配置为自动传递 Windows 凭据（我正在调用的公司 API 正在使用 Windows 身份验证）。 到目前为止，我在我的方法中创建了 HttpClient，如下所示：

var credentialsCache = new CredentialCache {{
  new Uri("https://localhost"),
  "NTLM",
  CredentialCache.DefaultNetworkCredentials
 }};
var handler = new HttpClientHandler { Credentials = credentialsCache };
var client = new HttpClient(handler);

但由于这可能导致套接字耗尽，我想使用工厂。 因此在Startup.cs我会像这样添加 HttpClient ：

public void ConfigureServices(IServiceCollection services)
{
 // ...
 services.AddHttpClient();
}

然后我会通过构造函数将工厂注入到我的服务中：

public class MyService
{
 private readonly IHttpClientFactory clientFactory;
 public MyService(IHttpClientFactory clientFactory)
 {
  this.clientFactory = clientFactory;
 }
 public async Task MakeHttpRequest()
 {
  var request = new HttpRequestMessage(HttpMethod.Get, "https://localhost/endpoint");
  var client = clientFactory.CreateClient();
  var response = await client.SendAsync(request);
  // ...
 }
}

如何配置以这种方式创建的客户端以使用网络凭据？ 理想情况下，我只想在ConfigureServices()中配置一次

Answer 1

您可以查看命名客户端并使用ConfigurePrimaryHttpMessageHandler方法

services
    .AddHttpClient("myService")
    .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler()
    {
        Credentials = credentialsCache
    });

MyService中的HttpClient应该使用给定的名称创建

...
var client = clientFactory.CreateClient("myService");
...

Answer 2

您可以使用选项模式来设置IHttpClientFactory如何创建HttpClient的配置。 您可以通过以下方式配置这些选项

未命名的选项，这些将应用于工厂创建的所有HttpClient实例

services.Configure<HttpClientFactoryOptions>(options =>
{
    options.HttpMessageHandlerBuilderActions.Add(builder =>
    {
        var credentialsCache = new CredentialCache {{
            new Uri("https://localhost"),
            "NTLM",
            CredentialCache.DefaultNetworkCredentials
        }};
        builder.PrimaryHandler = new HttpClientHandler { Credentials = credentialsCache };
    });
});

命名选项，这些仅适用于您将名称传递给工厂上的CreateClient方法的HttpClient实例

services.Configure<HttpClientFactoryOptions>("myclient", options =>
{
    options.HttpMessageHandlerBuilderActions.Add(builder =>
    {
        var credentialsCache = new CredentialCache {{
            new Uri("https://localhost"),
            "NTLM",
            CredentialCache.DefaultNetworkCredentials
        }};
        builder.PrimaryHandler = new HttpClientHandler { Credentials = credentialsCache };
    });
});

要使用命名选项，你会做

var client = clientFactory.CreateClient("myclient");