C# 尝试使用HttpWebRequest获取身份验证cookie

我必须从一个安全的站点上抓取一个表，我登录到页面并检索身份验证令牌和任何其他相关cookie时遇到问题。我做错什么了吗

public NameValueCollection LoginToDatrose()
{
    var loginUriBuilder = new UriBuilder();
    loginUriBuilder.Host = DatroseHostName;
    loginUriBuilder.Path = BuildURIPath(DatroseBasePath, LOGIN_PAGE);
    loginUriBuilder.Scheme = "https";

    var boundary = Guid.NewGuid().ToString();
    var postData = new NameValueCollection();
    postData.Add("LoginName", DatroseUserName);
    postData.Add("Password", DatrosePassword);

    var data = Encoding.ASCII.GetBytes(postData.ToQueryString(false));
    var request = WebRequest.Create(loginUriBuilder.Uri) as HttpWebRequest;
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";
    request.ContentLength = data.Length;
    using (var d = request.GetRequestStream())
    {
        d.Write(data, 0, data.Length);
    }

    var response = request.GetResponse() as HttpWebResponse;
    var responseCookies = new NameValueCollection();
    foreach (var nvp in response.Cookies.OfType<Cookie>())
    {
        responseCookies.Add(nvp.Name, nvp.Value);
    }

    //using (var responseData = response.GetResponseStream())
    //using (var responseReader = new StreamReader(responseData))
    //{
    //    var theResponse = responseReader.ReadToEnd();
    //    Debug.WriteLine(theResponse);
    //}

    return responseCookies;

}

public NameValueCollection LoginToDatrose（）
{
var loginUriBuilder=new UriBuilder（）；
loginUriBuilder.Host=DatroseHostName；
loginUriBuilder.Path=BuildURIPath（DatroseBasePath，登录页面）；
loginulibuilder.Scheme=“https”；
var boundary=Guid.NewGuid（）.ToString（）；
var postData=new NameValueCollection（）；
添加（“LoginName”，DatroseUserName）；
添加（“密码”，DatrosePassword）；
var data=Encoding.ASCII.GetBytes（postData.ToQueryString（false））；
var request=WebRequest.Create（loginuribilder.Uri）作为HttpWebRequest；
request.Method=“POST”；
request.ContentType=“application/x-www-form-urlencoded”；
request.ContentLength=data.Length；
使用（var d=request.GetRequestStream（））
{
d、 写入（数据，0，数据长度）；
}
var response=request.GetResponse（）作为HttpWebResponse；
var responseCookies=新名称valuecollection（）；
foreach（响应中的var nvp.Cookies.OfType（））
{
添加（nvp.Name，nvp.Value）；
}
//使用（var responseData=response.GetResponseStream（））
//使用（var responseReader=新的StreamReader（responseData））
//{
//var theResponse=responseReader.ReadToEnd（）；
//Debug.WriteLine（响应）；
//}
返回应答书；
}

我在返回对象中没有得到任何值。它不会失败。

theResponse

（未注释时）的值似乎是登录页面的HTML

---

非常感谢您的帮助。

好的，这里的问题似乎与传递凭据后发生的302重定向有关。

HttpWebRequest

将自动跟随302

最终，我做的事情有点不同。首先，我将

WebClient

类划分为以下子类：

public class CookiesAwareWebClient : WebClient
{
    private CookieContainer outboundCookies = new CookieContainer();
    private CookieCollection inboundCookies = new CookieCollection();

    public CookieContainer OutboundCookies
    {
        get
        {
            return outboundCookies;
        }
    }
    public CookieCollection InboundCookies
    {
        get
        { 
            return inboundCookies; 
        }
    }

    public bool IgnoreRedirects { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).CookieContainer = outboundCookies;
            (request as HttpWebRequest).AllowAutoRedirect = !IgnoreRedirects;
        }
        return request;
    }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        WebResponse response = base.GetWebResponse(request);
        if (response is HttpWebResponse)
        {
            inboundCookies = (response as HttpWebResponse).Cookies ?? inboundCookies;
        }
        return response;
    }
}

public NameValueCollection LoginToDatrose()
{
    var loginUriBuilder = new UriBuilder();
    loginUriBuilder.Host = DatroseHostName;
    loginUriBuilder.Path = BuildURIPath(DatroseBasePath, LOGIN_PAGE);
    loginUriBuilder.Scheme = "https";

    var postData = new NameValueCollection();
    postData.Add("LoginName", DatroseUserName);
    postData.Add("Password", DatrosePassword);

    var responseCookies = new NameValueCollection();

    using (var client = new CookiesAwareWebClient())
    {
        client.IgnoreRedirects = true;
        var clientResponse = client.UploadValues(loginUriBuilder.Uri, "POST", postData);
        foreach (var nvp in client.InboundCookies.OfType<Cookie>())
        {
            responseCookies.Add(nvp.Name, nvp.Value);
        }
    }

    return responseCookies;
}

这允许我使用一个能够识别cookies的

WebClient

类，以及一个我可以控制重定向的类。然后我重新编写了登录代码，如下所示：

public class CookiesAwareWebClient : WebClient
{
    private CookieContainer outboundCookies = new CookieContainer();
    private CookieCollection inboundCookies = new CookieCollection();

    public CookieContainer OutboundCookies
    {
        get
        {
            return outboundCookies;
        }
    }
    public CookieCollection InboundCookies
    {
        get
        { 
            return inboundCookies; 
        }
    }

    public bool IgnoreRedirects { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).CookieContainer = outboundCookies;
            (request as HttpWebRequest).AllowAutoRedirect = !IgnoreRedirects;
        }
        return request;
    }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        WebResponse response = base.GetWebResponse(request);
        if (response is HttpWebResponse)
        {
            inboundCookies = (response as HttpWebResponse).Cookies ?? inboundCookies;
        }
        return response;
    }
}

public NameValueCollection LoginToDatrose()
{
    var loginUriBuilder = new UriBuilder();
    loginUriBuilder.Host = DatroseHostName;
    loginUriBuilder.Path = BuildURIPath(DatroseBasePath, LOGIN_PAGE);
    loginUriBuilder.Scheme = "https";

    var postData = new NameValueCollection();
    postData.Add("LoginName", DatroseUserName);
    postData.Add("Password", DatrosePassword);

    var responseCookies = new NameValueCollection();

    using (var client = new CookiesAwareWebClient())
    {
        client.IgnoreRedirects = true;
        var clientResponse = client.UploadValues(loginUriBuilder.Uri, "POST", postData);
        foreach (var nvp in client.InboundCookies.OfType<Cookie>())
        {
            responseCookies.Add(nvp.Name, nvp.Value);
        }
    }

    return responseCookies;
}

public NameValueCollection LoginToDatrose（）
{
var loginUriBuilder=new UriBuilder（）；
loginUriBuilder.Host=DatroseHostName；
loginUriBuilder.Path=BuildURIPath（DatroseBasePath，登录页面）；
loginulibuilder.Scheme=“https”；
var postData=new NameValueCollection（）；
添加（“LoginName”，DatroseUserName）；
添加（“密码”，DatrosePassword）；
var responseCookies=新名称valuecollection（）；
使用（var client=new CookiesAwareWebClient（））
{
client.IgnoreRedirects=true；
var clientResponse=client.UploadValues（loginuribilder.Uri，“POST”，postData）；
foreach（client.InboundCookies.OfType（）中的var nvp）
{
添加（nvp.Name，nvp.Value）；
}
}
返回应答书；
}

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…一切都很顺利。

您可以在httpwebrequest具有AllowDirect属性的地方使用它。你可以设置错误；