c# - 如何从 Microsoft.Extensions.Http 包中配置 HttpClient？

Question

我正在使用 Microsoft.Extensions.Http我的 .NET Core 项目的包。向 API 发送请求时，我必须停用证书验证。不幸的是，我不知道在哪里为此配置客户端。设置 DI 容器时，我试过这个

private static IServiceCollection ConfigureHttpClients(this IServiceCollection services)
{
    services.AddHttpClient<IMyInterface, MyImplementation>(httpClient =>
    {
        using HttpClientHandler httpClientHandler = new HttpClientHandler()
        {
            ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
        };
        httpClient = new HttpClient(httpClientHandler);
    });

    // ...

    return services;
}

但这不起作用，我的 IDE 向我显示了变量 httpClient 的信息。

the value passed to the method is never used because it is overwritten in the method body before being read

那么我必须在哪里配置客户端以禁用验证？

Answer 1

使用 ConfigurePrimaryHttpMessageHandler配置类型化客户端使用的处理程序

//...

services
    .AddHttpClient<IMyInterface, MyImplementation>()
    .ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler() { 
        ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator 
    });

//...

引用 Configure the HttpMessageHandler