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

Question

我知道您可以通过在请求处理程序中添加

CookieContainer

来获取 cookie。

但是，除非我将

UseCookies

设置为 false，否则以下发布请求将失败：

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);
    }

说实话，我对 HTTP 请求不太了解。我原来的方法是否失败，因为我手动设置 cookie？

Answer 1

请求失败的原因可能取决于很多因素 - 例如身份验证和所需的其他标头，如果不知道您尝试访问的内容的具体情况，就很难判断是什么原因导致的。 这是一个简单的示例，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);
    }
}

Answer 2

很多人仍然建议

UseCookies = false

发送/覆盖自定义cookie，这是错误的。

UseCookies = false

是禁用请求/响应cookie容器，我知道如果我这样做，我可以发送自定义标头

Cookie

，但缺点是我无法读取cookie容器内的

Response Cookie

甚至响应标头。

覆盖此设置的正确方法是在

CookieContainer

中设置 cookie

CookieContainer cookies = new CookieContainer();
// add your custom cookie here (key, value, path, domain)
Cookie customCookie = new Cookie("cookieKey", "cookieValue", "/", "example.com");
cookies.Add(customCookie);

var clientHandler = new HttpClientHandler
{
    CookieContainer = cookies,
    //UseCookies = false, // no need this
};

// no need to write
// Headers = { { "cookie", "cookieKey=cookieValue" } }