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c# - Authentication per request using HttpClientFactory .net Core 2.1

问题描述

How should I use HttpClientFactory to return an instance of HttpClient whose uri and credentials are determined at the point of the call?

The existing code looks like this:

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

标签： c#.net-corehttpclientfactory

解决方案

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("", ""),
                };
            });

您的控制器将如下所示

 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

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