identityserver4 - 如何在键入的 HttpClient 中获取访问令牌

Question

我的服务器端 Blazor 应用程序中有一个 IdentityServer4/WebAPI 设置和一个键入的 HttpClient。我想在向 API 发出请求时动态添加访问令牌。但无论HttpContext是AuthenticationStateProvider在AddHttpClient方法中还是在AddHttpMessageHandler.

这在本地工作，但在服务器上运行httpContextAccessor为空：

        services.AddHttpClient<IMyClient, MyClient>((serviceProvider, client) =>
        {       
            var httpContextAccessor = serviceProvider.GetService<IHttpContextAccessor>();
            var accessToken = await httpContextAccessor.HttpContext.GetTokenAsync("access_token");
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken); 
        }).AddHttpMessageHandler<MyApiBearerTokenHandler>();

试图访问AuthenticationStateProvider

        services.AddHttpClient<IMyClient, MyClient>((serviceProvider, client) =>
        {       
            var authStateProvider = serviceProvider.GetService<AuthenticationStateProvider>();
        }).AddHttpMessageHandler<MyApiBearerTokenHandler>();

引发以下错误：

'无法从根提供程序解析范围服务'Microsoft.AspNetCore.Components.Authorization.AuthenticationStateProvider'。'

如何获取访问令牌AddHttpClient？我完全走错了吗？

标签： identityserver4blazorblazor-server-side