c# - 如何使用 HttpClient 返回 "refresh"cookie

Question

我在一个 Xamarin.Forms 项目上工作，我在其中调用一些使用 cookies 的 WebServices，因为它们最初是为网站制作的。有一些网络服务只返回 cookie，但其他网络服务需要接收 cookie 才能正常工作。

例如，Login 网络服务获取一个 JSON 并返回 2 个 cookie，而 Logout 网络服务获取一个“空”JSON，之前的 2 个 cookie，并且必须为其中一个 cookie 返回更新后的值。

我基于以下链接用HttpClient管理cookies: Struggling trying to get cookie out of response with HttpClient in .net 4.5

我的问题是我可以将 cookie 发送到网络服务，我可以接收网络服务返回的 cookie，但是如果我在调用之前发送了它，我将无法接收到任何“更新的”cookie...

调用Login 网络服务的代码如下所示:

public async Task Login()
{
    Uri uri = new Uri("http://www.website.com/Login");

    CookieContainer cookies = new CookieContainer();
    HttpClientHandler handler = new HttpClientHandler();
    handler.CookieContainer = cookies;

    var httpClient = new HttpClient(handler);

    var jsonParam = "{\"data\":{\"device\":\"xxx\",\"login\":\"my@email.com\",\"password\":\"password\"}}";

    HttpContent httpContent = new StringContent(jsonParam);
    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

    httpClient.DefaultRequestHeaders.Add("X-HTTP-Method-Override", "PUT");
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    try
    {
        HttpResponseMessage httpResponse = httpClient.PostAsync(uri), httpContent).Result;
        //Treatment of the recovered cookies
        IEnumerable<Cookie> responseCookies = cookies.GetCookies(uri).Cast<Cookie>();
        foreach (Cookie cookie in responseCookies)
        {
            Debug.WriteLine(cookie.Name + " : " + cookie.Value);
            wsCookies.Add(new KeyValuePair<string, string>(cookie.Name, cookie.Value));
        }

        if (httpResponse.IsSuccessStatusCode)
        {
            var responseText = await httpResponse.Content.ReadAsStringAsync();
        }
    }
    catch (Exception e)
    {

    }
}

=> 它运行良好:我得到了预期的 cookie:SESSIONID=xxx 和 USERID=xxx

我的Logout 方法的代码如下所示:

public async Task Logout(String test)
{
    Uri uri = new Uri("http://www.website.com/Logout");

    CookieContainer cookies = new CookieContainer();
    HttpClientHandler handler = new HttpClientHandler();
    handler.CookieContainer = cookies;

    var httpClient = new HttpClient(handler);

    var jsonParam = "{\"data\":{}}";

    HttpContent httpContent = new StringContent(jsonParam);
    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

    httpClient.DefaultRequestHeaders.Add("X-HTTP-Method-Override", "GET");
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    //Retrieving cookies to send
    foreach (KeyValuePair<string, string> kvpCookie in wsCookies)
    {
        cookies.Add(uri, new Cookie(kvpCookie.Key, kvpCookie.Value));
    }

    try
    {
        HttpResponseMessage httpResponse = httpClient.PostAsync(uri, httpContent).Result;
        //Treatment of the recovered cookies
        IEnumerable<Cookie> responseCookies = cookies.GetCookies(uri).Cast<Cookie>();
        foreach (Cookie cookie in responseCookies)
        {
            Debug.WriteLine(cookie.Name + " : " + cookie.Value);
            wsCookies.Add(new KeyValuePair<string, string>(cookie.Name, cookie.Value));
        }

        if (httpResponse.IsSuccessStatusCode)
        {
            var responseText = await httpResponse.Content.ReadAsStringAsync();
        }
    }
    catch (Exception e)
    {

    }
}

=> 此方法有效，但我没有得到预期的 cookie。我发送了之前收到的 cookie(名称和值)(SESSIONID=xxx 和 USERID=xxx)，但我没有得到新的值cookie，而我等待 USERID=deleted 正如我在 Fiddler 中嗅探它时所看到的:我只找到我在“responseCookies”中发送的 2 个 cookie...

=> 你有解释吗？我做错了什么吗？有没有其他方法来管理网络服务和 cookie？

Answer 1

不确定这是否是问题所在，但为什么每次都创建 cookie 容器？您每次都可以传递 cookie。

所以初始化一次，然后将已有的cookie容器赋值给Login和Logout中的请求。