在Blazor中，我们可以使用HttpClient库来发出HTTP请求。为了达到目的，我们需要调用API提供者的HTTP接口。下面是两个示例，分别展示了“不用凭证请求草莓奶昔”和“使用凭证请求草莓奶昔”的情况：

1. 不用凭证请求草莓奶昔

@inject HttpClient http

@code { private string strawberryShakeResponse;

private async Task MakeStrawberryShakeRequest()
{
    var response = await http.GetAsync("https://example.com/strawberryshake");
    if (response.IsSuccessStatusCode)
    {
        strawberryShakeResponse = await response.Content.ReadAsStringAsync();
    }
}

}

2. 使用凭证请求草莓奶昔

@inject HttpClient http @inject IConfiguration configuration

@code { private string strawberryShakeResponse;

private async Task MakeStrawberryShakeRequest()
{
    var token = await GetAccessToken();
    http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

    var response = await http.GetAsync("https://example.com/strawberryshake");
    if (response.IsSuccessStatusCode)
    {
        strawberryShakeResponse = await response.Content.ReadAsStringAsync();
    }
}

private async Task GetAccessToken()
{
    var client = new HttpClient();
    var disco = await client.GetDiscoveryDocumentAsync(configuration["AuthServer"]);

    if (disco.IsError)
    {
        throw new Exception(disco.Error);
    }

    var tokenResponse = await client.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
    {
        Address = disco.TokenEndpoint,
        ClientId = configuration["ClientId"],
        ClientSecret = configuration["ClientSecret"],
        Scope = "strawberryshakeapi"
    });

    if (tokenResponse.IsError)
    {
        throw new Exception(tokenResponse.Error);
    }

    return tokenResponse.AccessToken;
}

}

在第二个示例中，我们首先使用IdentityServer或其他身份验证服务获取令牌