请问一下，为什么我这老是获取不到COOKIE？

Question

        string strurl = "http://www.clicksaya.com/website/default.aspx";        string postData = "ctl00$ContentPlaceHolder1$websiteLogin1$tbUsername=[e-mail]&ctl00$ContentPlaceHolder1$websiteLogin1$tbPassword=111111&__EVENTVALIDATION=/wEWCAKg48mdDwLwptrHBQKevaaZCAKH1uKjCgLAkIr5BALfmYj5BALNws3TBgKy3p7hAVb6TE/A0Hu49JhH/87U1q1++i+8&__VIEWSTATE=/wEPDwUKMTA2NjEzMTQ5N2QYAQUeX19Db250cm9sc1JlcXVpcmVQb3N0QmFja0tleV9fFgMFNGN0bDAwJENvbnRlbnRQbGFjZUhvbGRlcjEkd2Vic2l0ZUxvZ2luMSRJbWFnZUJ1dHRvbjEFMmN0bDAwJENvbnRlbnRQbGFjZUhvbGRlcjEkd2Vic2l0ZUxvZ2luMSRjYlJlbWVtYmVyBS9jdGwwMCRDb250ZW50UGxhY2VIb2xkZXIxJHdlYnNpdGVMb2dpbjEkaWJMb2dpbr835ABpAJS3gOqaobgPreac5MNP&ctl00$sm=ctl00$up1|ctl00$ContentPlaceHolder1$websiteLogin1$ibLogin&__ASYNCPOST=true";
        HttpWebRequest reqt = (HttpWebRequest)WebRequest.Create(strurl);
        CookieContainer myCookieContainer = new CookieContainer();
        reqt.CookieContainer = myCookieContainer;
        cookieheader = reqt.CookieContainer.GetCookieHeader(new Uri(strurl));
        reqt.Method = "POST";
        reqt.ContentType = "application/x-www-form-urlencoded";
        reqt.AllowAutoRedirect = true;
        byte[] strbyte = Encoding.UTF8.GetBytes(postData);
        Stream strm = reqt.GetRequestStream();
        strm.Write(strbyte, 0, strbyte.Length);
        strm.Close();
        HttpWebResponse resp = (HttpWebResponse)reqt.GetResponse();
        

Answer 1

cookieheader 总是为空是什么原因呢？还有，CookieContainer myCookieContainer = new CookieContainer(); 
        reqt.CookieContainer = myCookieContainer; 
这样老感觉没意义，因为前面没给值，后面又没有用到。。

Answer 2

取cookie的方法google一下，有用API取的

Answer 3

也许你所访问的网站并没有在客户端留下cookie,所以为空.

Answer 4

private string HttpWebRequestLogin(string loginUrl, string postData, ref CookieContainer cookieContainer) 
{ 
    byte[] bdata = Encoding.Default.GetBytes(postData); 
    System.Net.HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(loginUrl); 
    myRequest.Method = "POST"; 
    myRequest.ContentType = "application/x-www-form-urlencoded"; 
    myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; 
    myRequest.Referer = loginUrl; 
    myRequest.KeepAlive = true; 
    myRequest.AllowAutoRedirect = true; 
    if (cookieContainer == null) 
        cookieContainer = new CookieContainer(); 
    myRequest.CookieContainer = cookieContainer; 
    myRequest.ContentLength = bdata.Length; 
    Stream newStream = myRequest.GetRequestStream(); 
    newStream.Write(l_data, 0, bdata.Length); 
    newStream.Close(); 
    HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); 
    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.GetEncoding("GB2312")); 
    string content = reader.ReadToEnd(); 
    return content; 
} 
 
 

Answer 5

CookieContainer myCookieContainer = new CookieContainer();
        reqt.CookieContainer = myCookieContainer;
        cookieheader = reqt.CookieContainer.GetCookieHeader(new Uri(strurl)); 
刚创建的CookieContainer是空的，不会有任何值在里面要取得返回的Cookie 在request.GetResponse以后用HttpWebResponse.Cookies楼上代码Stream newStream = myRequest.GetRequestStream();
    newStream.Write(l_data, 0, bdata.Length);
    newStream.Close(); Close不自动Flush需要手动

Answer 6

但是，我在查看 HttpWebResponse.Cookies 的数目的时候，还是0.
请问这是什么原因？

Answer 7

70|error|500|The state information is invalid for this page and might be corrupted.最后出现这个问题是怎么回事呢？麻烦高手回答。

Answer 8

我在本地写了一个测试页面测试。但是我用这个去测试的时候到
HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); 报500错误了。请问一下，这是怎么回事呢？

Answer 9

ctl00$sm ctl00$up1|ctl00$ContentPlaceHolder1$websiteLogin1$ibLogin
ctl00$ContentPlaceHolder1$websiteLogin1$tbUsername asdf
ctl00$ContentPlaceHolder1$websiteLogin1$tbPassword
ctl00$ContentPlaceHolder1$websiteLogin1$tbwe1_ClientState
ctl00$ContentPlaceHolder1$websiteLogin1$tbwe2_ClientState
__LASTFOCUS
__VIEWSTATE /wEPDwUKMTA2NjEzMTQ5N2QYAQUeX19Db250cm9sc1JlcXVpcmVQb3N0QmFja0tleV9fFgMFNGN0bDAwJENvbnRlbnRQbGFjZUhvbGRlcjEkd2Vic2l0ZUxvZ2luMSRJbWFnZUJ1dHRvbjEFMmN0bDAwJENvbnRlbnRQbGFjZUhvbGRlcjEkd2Vic2l0ZUxvZ2luMSRjYlJlbWVtYmVyBS9jdGwwMCRDb250ZW50UGxhY2VIb2xkZXIxJHdlYnNpdGVMb2dpbjEkaWJMb2dpbr835ABpAJS3gOqaobgPreac5MNP
__EVENTTARGET
__EVENTARGUMENT
__EVENTVALIDATION /wEWCAKg48mdDwLwptrHBQKevaaZCAKH1uKjCgLAkIr5BALfmYj5BALNws3TBgKy3p7hAVb6TE/A0Hu49JhH/87U1q1++i+8
__ASYNCPOST true
ctl00$ContentPlaceHolder1$websiteLogin1$ibLogin.x 35
ctl00$ContentPlaceHolder1$websiteLogin1$ibLogin.y 26
这个网站登录的表单，我猜需要你先访问一次这个页，先取得这些内容

Answer 10

static void Main(string[] args)
        {
            System.Net.HttpWebRequest request;
            System.Net.HttpWebResponse response;
            System.IO.Stream stream;
            System.IO.StreamReader reader;
            byte[] body;
            int i;
            string content;            body = System.Text.Encoding.UTF8.GetBytes("ctl00$ContentPlaceHolder1$websiteLogin1$tbUsername=asdf&ctl00$ContentPlaceHolder1$websiteLogin1$tbPassword=asdf");            request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create("http://www.clicksaya.com/website/default.aspx");            request.CookieContainer = new System.Net.CookieContainer();            request.Method = "POST";            request.ContentType = "application/x-www-form-urlencoded; charset=utf-8";            request.Referer = "http://www.clicksaya.com/website/default.aspx";            request.ContentLength = body.Length;            using(stream = request.GetRequestStream())
            {
                stream.Write(body, 0, body.Length);
                stream.Flush();
            }            response = null;            try
            {
                response = (System.Net.HttpWebResponse)request.GetResponse();
                for (i = 0; i < response.Headers.Count; ++i)
                {
                    System.Console.WriteLine(string.Concat(response.Headers.GetKey(i), ": ", response.Headers.Get(i)));
                }
                stream = response.GetResponseStream();
                reader = new System.IO.StreamReader(stream, System.Text.Encoding.UTF8);
                content = reader.ReadToEnd();
                reader.Close();
                System.Console.WriteLine(content);
            }
            finally
            {
                if(null != response)
                    response.Close();
            }            System.Console.ReadLine();
        }

Answer 11

麻烦高手再帮我看看。。        try
        {
            response = (System.Net.HttpWebResponse)request.GetResponse();
            response.Cookies = request.CookieContainer.GetCookies(new Uri(loginUrl));
            for (i = 0; i < response.Headers.Count; ++i)
            {
                if (aa == "")
                {
                    aa = string.Concat(response.Headers.GetKey(i), ": ", response.Headers.Get(i));
                }
                else
                {
                    aa += string.Concat(response.Headers.GetKey(i), ": ", response.Headers.Get(i));
                }
        }
            stream = response.GetResponseStream();
            reader = new System.IO.StreamReader(stream, System.Text.Encoding.UTF8);
            content = reader.ReadToEnd();
            reader.Close();
            lblget.Text = response.Cookies.Count.ToString();我加了红色的那一段，为什么获取COOKIE还是0呢？

Answer 12

把Cookie加到Response里没什么意义的吧？楼主是不是要在请求时添加Cookie？
那么。。
request.CookieContainer = new System.Net.CookieContainer();只要把这行代码改成指定的CookieContainer 就可以了
然后在得到Response后，把响应的Cookie加到前面指定的CookieContainer 里就可以了

Answer 13

我加这行也不行
response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);

Answer 14

在整个过程中，request.CookieContainer是不会发生变化的，有的只会在response的Cookies里面体现出来，但除了指定HttpOnly的Cookie，要获取这个Cookie就从response.Headers里面找出set-cookie头的值

Answer 15

你是不是要获得相应的Cookie？

Answer 16

要Cookie,用Response.Cookies取就可以了上面代码，你看一下输出的头，就知道是怎么回事了

Answer 17

        CookieContainer cc= new System.Net.CookieContainer();        request.CookieContainer = cc;最后response = (System.Net.HttpWebResponse)request.GetResponse(); 之后
cc.Add(response.Cookies);就可以了是吗？

Answer 18

response = (System.Net.HttpWebResponse)request.GetResponse();
            cc.Add(response.Cookies); 
之后request.Cookies.Count 数量还是0

Answer 19

CC和COOKIE不是同一个类型，怎么加呢

Answer 20

不用再去判断request.cookies了我刚才看了，这个网站只有一个Cookie,而且是HttpOnly的，你要取这个Cookie只有从Response.Headers里取了

Answer 21

string cookie = response.Headers["Set-Cookie"];这样么？是空的

Answer 22

System.Net.HttpWebRequest request;
            System.Net.HttpWebResponse response;
            System.IO.Stream stream;
            byte[] body;            System.Net.CookieContainer cookies;            cookies = new System.Net.CookieContainer();            body = System.Text.Encoding.UTF8.GetBytes("ctl00$ContentPlaceHolder1$websiteLogin1$tbUsername=asdf&ctl00$ContentPlaceHolder1$websiteLogin1$tbPassword=asdf");            request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create("http://www.clicksaya.com/website/default.aspx");            request.CookieContainer = cookies;            request.Method = "POST";            request.ContentType = "application/x-www-form-urlencoded; charset=utf-8";            request.Referer = "http://www.clicksaya.com/website/default.aspx";            request.ContentLength = body.Length;            using(stream = request.GetRequestStream())
            {
                stream.Write(body, 0, body.Length);
                stream.Flush();
            }            response = null;            try
            {
                response = (System.Net.HttpWebResponse)request.GetResponse();                cookies.Add(response.Cookies);
            }
            finally
            {
                if(null != response)
                    response.Close();
            }            foreach (System.Net.Cookie c in cookies.GetCookies(new Uri("http://www.clicksaya.com/website/default.aspx")))
            {
                System.Console.WriteLine(string.Concat(c.Name, ": ", c.Value));
            }            System.Console.ReadLine();

Answer 23

看下，我执行是可以看到的，顺便纠正下，Cookie就算是HttpOnly也是可以取到的