public interface IMyWebApi : IHttpApi
{
    [HttpGet("user/{id}")]
    ITask<UserInfo> GetUserAsync(string id);
}

HttpApi.Register<IMyWebApi>().ConfigureHttpApiConfig(c =>
{
    // 可以替换的序列化工具
    c.JsonFormatter = null;
    c.XmlFormatter = null;
    c.KeyValueFormatter = null;
    // 参数验证和返回值验证，使用System.ComponentModel.DataAnnotations验证特性
    c.UseParameterPropertyValidate = false;
    c.UseReturnValuePropertyValidate = false;
    // 请求主机和HttpClient相关配置
    c.HttpHost = new Uri("https://localhost:9999/");
    c.HttpClient.Timeout = TimeSpan.FromMinutes(2d);               
    // 格式相关配置
    c.FormatOptions.UseCamelCase = true;
    c.FormatOptions.DateTimeFormat = DateTimeFormats.ISO8601_WithMillisecond;
    // 响应缓存提供者配置，配合[CacheAttribute]来使用
    c.ResponseCacheProvider = null; 
    // 服务提供者，实例一般由DI创建得到
    // 对于Asp.net core，此ServiceProvider应该为请求时创建的ServiceProvider，而不是ConfigureServices()创建的根ServiceProvider
    c.ServiceProvider = null;
    // 日志工厂，可以自主创建并赋值，如果保留为null，获取其实例时则从ServiceProvider获取 
    c.LoggerFactory = null;
});

var myWebApi = HttpApi.Resolve<IMyWebApi>();
var user = await myWebApi.GetUserAsync("id001");

public interface IMyWebApi : IHttpApi
{
    [HttpGet("user/{id}")]
    ITask<UserInfo> GetUserAsync(string id);
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpApi<IMyWebApi>();
    services.ConfigureHttpApi<IMyWebApi>(o=>
    {
        o.HttpHost = new Uri("https://localhost:9999/");
        ...
    });
}

public class HomeController : Controller
{
    public async Task<UserInfo> Index([FromServices]IMyWebApi myWebApi)
    {
        return await myWebApi.GetUserAsync("id001");
    }
}

var builder = new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired();
builder.Register(_ => new HttpApiFactory<IMyWebApi>()
    .ConfigureHttpApiConfig(c =>
    {
        c.HttpHost = new Uri("https://localhost:9999/");
        c.FormatOptions.DateTimeFormat = DateTimeFormats.ISO8601_WithMillisecond;
    }))
    .As<IHttpApiFactory<IMyWebApi>>()
    .SingleInstance();
builder.Register(c => c.Resolve<IHttpApiFactory<IMyWebApi>>().CreateHttpApi())
    .As<IMyWebApi>()
    .InstancePerHttpRequest();
DependencyResolver.SetResolver(new AutofacDependencyResolver(builder.Build()));

public class HomeController : Controller
{
    public IMyWebApi MyWebApi { get; set; }
    public async Task<ActionResult> Index()
    {
        var user = await this.MyWebApi.GetUserAsync("id001");
        return View(user);
    }
}