c# - 在 winforms 中使用 HttpWebRequest 传递 cookie？

Question

请看下面的代码:

    objCookieContainer = new CookieContainer();

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://website.com/login.php?user=xxx&pass=xxx");
    request.Method = WebRequestMethods.Http.Get;
    request.Timeout = 15000;
    request.Proxy = null;
    request.CookieContainer = objCookieContainer;

    HttpWebRequest newRequest = (HttpWebRequest)WebRequest.Create("http://website.com/page.php?link=url");
    newRequest.Method = WebRequestMethods.Http.Get;
    newRequest.Timeout = 15000;
    newRequest.Proxy = null;
    newRequest.CookieContainer = objCookieContainer;

    HttpWebResponse response = null;

    response = (HttpWebResponse)request.GetResponse();
    string readerRequest = new StreamReader(response.GetResponseStream(), Encoding.UTF8).ReadToEnd();

    response = (HttpWebResponse)newRequest.GetResponse();
    string readerNewRequest = new StreamReader(response.GetResponseStream()).ReadToEnd();

在使用 request.GetResponse() 之后，cookie 成功地填充了数据并且它有它的身份验证代码并且 readerRequest 也被填充了，之后我调用了 newRequest.GetResponse() 但 readerNewRequest 是空的，我尝试做很多事情但结果总是一样，我解决这个问题的唯一方法是使用 WebBrowser 对象，我在其中传递 url 并且我能够使用 WebBrowser.DocumentStream 获取内容。

我该如何解决这个问题？

Answer 1

    private void button1_Click(object sender, EventArgs e)
    {
        var objCookieContainer = new CookieContainer();

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://website.com/login.php?user=xxx&pass=xxx");
        request.Method = WebRequestMethods.Http.Get;
        request.Timeout = 15000;
        request.Proxy = null;
        request.CookieContainer = objCookieContainer;

        HttpWebRequest newRequest = (HttpWebRequest)WebRequest.Create("http://website.com/page.php?link=url");
        newRequest.Method = WebRequestMethods.Http.Post;
        newRequest.Timeout = 15000;
        newRequest.Proxy = null;


        HttpWebResponse response = null;

        response = (HttpWebResponse)request.GetResponse();
        //once you read response u need to add all cookie sent in header to the 'objCookieContainer' so that it can be forwarded on second response
        foreach (Cookie cookie in response.Cookies)
        {
            objCookieContainer.Add(cookie);
        }
        string readerRequest = new StreamReader(response.GetResponseStream(), Encoding.UTF8).ReadToEnd();


        //since you have added the cookies, this must response fine now
        newRequest.CookieContainer = objCookieContainer;
        response = (HttpWebResponse)newRequest.GetResponse();
        string readerNewRequest = new StreamReader(response.GetResponseStream()).ReadToEnd();
    }

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如果您的 .NET 版本低于 4.0，您可能会遇到 CookieContainer 错误:检查 This Link