c# - 使用 HttpClientFactory .net Core 2.1 对每个请求进行身份验证

Question

我应该如何使用 HttpClientFactory 返回其 uri 和凭据在调用时确定的 HttpClient 实例？

现有代码如下所示:

var httpClientHandler = new HttpClientHandler()
    {
        Credentials = new NetworkCredential(userName, password),
    };
HttpClient client = new HttpClient(httpClientHandler);
client.BaseAddress = new Uri(_appSetting.ServiceURI);

Answer 1

启动类中的ConfigureServices方法

services.AddHttpClient("github", c =>
{
    //c.BaseAddress = new Uri("https://api.github.com/");
    c.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");
    c.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
    
}).ConfigurePrimaryHttpMessageHandler(() =>
{
    return new HttpClientHandler()
    {
        UseDefaultCredentials = true,
        Credentials = new NetworkCredential("", ""),
    };
});

你的 Controller 看起来像这样

private readonly IHttpClientFactory _httpClientFactory;

public DataProController(IHttpClientFactory httpClientFactory)
{
    _httpClientFactory = httpClientFactory;
}

[HttpGet]
public async Task<ActionResult> Get()
{            
    var client = _httpClientFactory.CreateClient("github");
    
    client.BaseAddress = new Uri("https://api.github.com/");

    string result = await client.GetStringAsync("/");
    return Ok(result);
}

使用 httpclientfactory 时，您可能无法在运行时设置网络凭据，可能需要在启动类中进行设置。您可以在此处找到有关此问题的信息。 https://github.com/aspnet/HttpClientFactory/issues/71