C# HttpClient -如果请求头中的UseCookies设置为false，是否可以从响应中获取cookies？

Question

我知道您可以通过在请求处理程序中添加一个CookieContainer来获取cookie。

但是，除非我将UseCookies设置为false，否则以下post请求将失败：

static CookieContainer cookies = new CookieContainer();    

  var clientHandler = new HttpClientHandler
    {
       //Original Apporach - this fails the POST request 
       // UseCookies = true,
       // CookieContainer = cookies,

       //I had to do this
        UseCookies = false,
    };
    var client = new HttpClient(clientHandler);
    var request = new HttpRequestMessage
    {
        Method = HttpMethod.Post,
        RequestUri = new Uri("*redacted*"),
        Headers =
        {
            { "cookie", "SampleCookie" },
        },
        Content = new FormUrlEncodedContent(new Dictionary<string, string>
        {
            { "Provider", "Email" },
            { "Code", "12345" },
            { "RememberMe", "False" },
            { "RememberBrowser", "false" },
            { "__RequestVerificationToken", "SampleToken" },
        }),
    };
    using (var response = await client.SendAsync(request))
    {
        response.EnsureSuccessStatusCode();
        var body = await response.Content.ReadAsStringAsync();
        Console.WriteLine(body);
    }

老实说，对HTTP请求不是很了解。我原来的方法是不是因为我手动设置cookie而失败了？

Answer 1

请求失败的原因可能取决于许多因素--比如身份验证和所需的其他头部，如果不知道您试图访问的具体内容，就很难判断是什么导致了请求失败。这里有一个简单的例子，展示了如何向Google首页发出请求，并将所有cookie放入容器中，并在控制台应用程序中打印出来：

static void Main(string[] args)
{
    var uri = new Uri("https://google.com");
    var cookies = new CookieContainer();
    var handler = new HttpClientHandler();
    handler.CookieContainer = cookies;

    using (var client = new HttpClient(handler))
    {
        var result = client.GetAsync(uri).Result;
    }

    foreach (Cookie cookie in cookies.GetCookies(uri))
    {
        var print = $"cookie name: {cookie.Name}\ncookie value: {cookie.Value}\n";
        Console.WriteLine(print);
    }
}