C# 在 .net 4.5 中尝试使用 HttpClient 使 cookie 脱离响应

Struggling trying to get cookie out of response with HttpClient in .net 4.5

提问by Peter Kellner

I've got the following code that works successfully. I can't figure out how to get the cookie out of the response. My goal is that I want to be able to set cookies in the request and get cookies out of the response. Thoughts?

我有以下成功运行的代码。我不知道如何从响应中获取 cookie。我的目标是我希望能够在请求中设置 cookie 并从响应中获取 cookie。想法？

private async Task<string> Login(string username, string password)
{
    try
    {
        string url = "http://app.agelessemail.com/account/login/";
        Uri address = new Uri(url);
        var postData = new List<KeyValuePair<string, string>>
        {
            new KeyValuePair<string, string>("username", username),
            new KeyValuePair<string, string>("password ", password)
        };

        HttpContent content = new FormUrlEncodedContent(postData);
        var cookieJar = new CookieContainer();
        var handler = new HttpClientHandler
        {
            CookieContainer = cookieJar,
            UseCookies = true,
            UseDefaultCredentials = false
        };

        var client = new HttpClient(handler)
        {
            BaseAddress = address
        };


        HttpResponseMessage response = await client.PostAsync(url,content);
        response.EnsureSuccessStatusCode();
        string body = await response.Content.ReadAsStringAsync();
        return body;
    }
    catch (Exception e)
    {
        return e.ToString();
    }
}

Here is the complete answer:

这是完整的答案：

HttpResponseMessage response = await client.PostAsync(url,content);
response.EnsureSuccessStatusCode();

Uri uri = new Uri(UrlBase);
var responseCookies = cookieJar.GetCookies(uri);
foreach (Cookie cookie in responseCookies)
{
    string cookieName = cookie.Name;
    string cookieValue = cookie.Value;
}

采纳答案by Despertar

To add cookies to a request, populate the cookie container before the request with CookieContainer.Add(uri, cookie). After the request is made the cookie container will automatically be populated with all the cookies from the response. You can then call GetCookies() to retreive them.

要将 cookie 添加到请求中，请在请求之前填充 cookie 容器CookieContainer.Add(uri, cookie)。发出请求后，cookie 容器将自动填充响应中的所有 cookie。然后您可以调用 GetCookies() 来检索它们。

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

HttpClient client = new HttpClient(handler);
HttpResponseMessage response = client.GetAsync("http://google.com").Result;

Uri uri = new Uri("http://google.com");
IEnumerable<Cookie> responseCookies = cookies.GetCookies(uri).Cast<Cookie>();
foreach (Cookie cookie in responseCookies)
    Console.WriteLine(cookie.Name + ": " + cookie.Value);

Console.ReadLine();

回答by Alper Ebicoglu

You can easily get a cookie value with the given URL.

您可以使用给定的 URL 轻松获取 cookie 值。

private async Task<string> GetCookieValue(string url, string cookieName)
{
    var cookieContainer = new CookieContainer();
    var uri = new Uri(url);
    using (var httpClientHandler = new HttpClientHandler
    {
        CookieContainer = cookieContainer
    })
    {
        using (var httpClient = new HttpClient(httpClientHandler))
        {
            await httpClient.GetAsync(uri);
            var cookie = cookieContainer.GetCookies(uri).Cast<Cookie>().FirstOrDefault(x => x.Name == cookieName);
            return cookie?.Value;
        }
    }
}

回答by Rytis I

There's alternative if you don't have access to the HttpClientand can't inject the CookieContainer. This works in .NET Core 2.2:

如果您无权访问HttpClient并且无法注入CookieContainer. 这适用于 .NET Core 2.2：

private string GetCookie(HttpResponseMessage message)
{
    message.Headers.TryGetValues("Set-Cookie", out var setCookie);
    var setCookieString = setCookie.Single();
    var cookieTokens = setCookieString.Split(';');
    var firstCookie = cookieTokens.FirstOrDefault();
    var keyValueTokens = firstCookie.Split('=');
    var valueString = keyValueTokens[1];
    var cookieValue = HttpUtility.UrlDecode(valueString);
    return cookieValue;
}