在 Blazor 服务器端使用 HttpClient 获取 StatusCode 407 AuthenticationRequired

Question

我正在尝试从 Blazor 服务器端项目访问 WebApi，已按如下方式配置 HttpClient，但我总是得到：

{StatusCode: 407, ReasonPhrase: 'authenticationrequired', Version: 1.1, Content: System.Net.Http.HttpConnectionResponseContent, Headers:{  Date: Thu, 24 Oct 2019 11:01:00 GMT  Cache-Control: no-cache  X-Frame-Options: deny  Proxy-Connection: Keep-Alive  Proxy-Authenticate: NTLM  Content-Type: text/html  Content-Length: 3851}}

           services.AddHttpClient<IUsersService, HttpUsersService>(options =>
            {
                options.BaseAddress = new Uri("https://api.example.com/");
                options.DefaultRequestHeaders.Accept.Clear();
                options.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            })
                .ConfigureHttpMessageHandlerBuilder(h =>
                    new HttpClientHandler
                    {
                        DefaultProxyCredentials = CredentialCache.DefaultCredentials,
                    });

private async Task<User> GetUser()
{
    var response = await _httpClient.GetAsync("v1/Users");

    var test = await response.Content.ReadAsStreamAsync();

    var model = await JsonSerializer.DeserializeAsync<User[]>(test);

    return model.First();
}

有没有办法获取系统的代理和凭据或者我在这里做错了什么？

Answer 1

你在哪里应用这个代码：

services.AddHttpClient<IUsersService, HttpUsersService>(options =>
            {
                options.BaseAddress = new Uri("https://api.example.com/");
                options.DefaultRequestHeaders.Accept.Clear();
                options.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            })
                .ConfigureHttpMessageHandlerBuilder(h =>
                    new HttpClientHandler
                    {
                        DefaultProxyCredentials = CredentialCache.DefaultCredentials,
                    });

我猜是 Startup class，对吧？

好的，因为你在上面提到你正在从 Blazor 客户端应用程序调用 Web Api 端点，所以不应使用此代码。我猜，这段代码从 IHttpClientFactory 创建了一个 HttpClient 服务。这与 Blazor 客户端应用程序中使用的 HttpClient 服务无关，该服务基于 JavaScript Fetch API.

但是，Blazor 框架默认将 HttpClient 服务添加到 DI 容器中，要使用它，您只需将其注入到您的组件或 class 服务中...

样本：

 @page "/"
    @inject HttpClient Http

    // more code... 

    @code {
        User[] users;

        // more code... 
    private async Task<User> GetUser()
    {
        users = await Http.GetJsonAsync<User[]>("v1/Users");
        return model.First();
    }

    }

希望这对您有所帮助...

在 Blazor 服务器端使用 HttpClient 获取 StatusCode 407 AuthenticationRequired

Using HttpClient in Blazor server side getting StatusCode 407 AuthenticationRequired

c#

dotnet-httpclient

.net-core

blazor