C# 远程服务器返回错误：（401）未经授权

我正在使用提取gmail联系人。I get

远程服务器在执行此行时返回错误：（401）未经授权。

HttpWebResponse exportResponse=（HttpWebResponse）contactsRequest.GetResponse（）

下面是完整的
GmailExtract
类

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using Utilities.Web;

namespace OpenContactsNet
{
    public class GmailExtract : IMailContactExtract
    {
        private const string ContinueUrl = "http://mail.google.com/mail?ui=html&zy=l";
        private const string ExportUrl = "https://mail.google.com/mail/contacts/data/export?exportType=ALL&groupToExport=&out=GMAIL_CSV";
        private const string LoginRefererUrl = "https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&ltmpl=default&ltmplcache=2";
        private const string LoginUrl = "https://www.google.com/accounts/ServiceLoginAuth?service=mail";
        private const string UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; EmbeddedWB 14.52 from: http://www.bsalsa.com/ EmbeddedWB 14.52; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 1.0.3705; .NET CLR 3.0.04506.30)";

        #region IMailContactExtract Members

        public bool Extract( NetworkCredential credential, out MailContactList list )
        {
            bool result = false;
            list = new MailContactList();

            try
            {
                CookieCollection cookies = new CookieCollection();

                // Prepare login form data
                HttpValueCollection loginFormValues = new HttpValueCollection();
                loginFormValues[ "ltmpl" ] = "default";
                loginFormValues[ "ltmplcache" ] = "2";
                loginFormValues[ "continue" ] = ContinueUrl;
                loginFormValues[ "service" ] = "mail";
                loginFormValues[ "rm" ] = "false";
                loginFormValues[ "hl" ] = "en";
                loginFormValues[ "Email" ] = credential.UserName;
                loginFormValues[ "Passwd" ] = credential.Password;
                loginFormValues[ "PersistentCookie" ] = "true";
                loginFormValues[ "rmShown" ] = "1";
                loginFormValues[ "null" ] = "Sign In";

                // Convert to bytes
                byte[] loginPostData = Encoding.UTF8.GetBytes( loginFormValues.ToString( true ) );

                HttpWebRequest loginRequest = ( HttpWebRequest ) WebRequest.Create( LoginUrl );
                loginRequest.Method = "POST";
                loginRequest.UserAgent = UserAgent;
                loginRequest.Referer = LoginRefererUrl;
                loginRequest.ContentType = "application/x-www-form-urlencoded";
                loginRequest.ContentLength = loginPostData.Length;
                loginRequest.AllowAutoRedirect = false;

                // Create cookie container
                loginRequest.CookieContainer = new CookieContainer();

                // Add post data to request
                Stream stream;
                using ( stream = loginRequest.GetRequestStream() )
                {
                    stream.Write( loginPostData, 0, loginPostData.Length );
                }

                HttpWebResponse loginResponse = ( HttpWebResponse ) loginRequest.GetResponse();

                cookies.Add( loginResponse.Cookies );

                // Create request to export Google CSV page
                HttpWebRequest contactsRequest = ( HttpWebRequest ) WebRequest.Create( ExportUrl );
                contactsRequest.Method = "GET";
                contactsRequest.UserAgent = UserAgent;
                contactsRequest.Referer = loginResponse.ResponseUri.ToString();

                // use cookie gotten from login page
                contactsRequest.CookieContainer = new CookieContainer();
                foreach ( Cookie cookie in cookies )
                {
                    contactsRequest.CookieContainer.Add( cookie );
                }

                HttpWebResponse exportResponse = ( HttpWebResponse ) contactsRequest.GetResponse();

                // Read data from response stream
                string csvData;
                using ( Stream responseStream = exportResponse.GetResponseStream() )
                {
                    using ( StreamReader streamRead = new StreamReader( responseStream ) )
                    {
                        csvData = streamRead.ReadToEnd();
                    }
                }

                // parse google csv
                string[] lines = csvData.Split( '\n' );
                foreach ( string line in lines )
                {
                    string[] values = line.Split( ',' );
                    if ( values.Length < 2 )
                    {
                        continue;
                    }

                    MailContact mailContact = new MailContact();
                    mailContact.Email = values[ 1 ];
                    mailContact.Name = values[ 0 ];
                    list.Add( mailContact );
                }

                result = true;
            }
            catch (Exception e)
            {
                throw e;
            }

            return result;
        }

        #endregion
    }
}

使用系统；
使用System.Collections.Generic；
使用System.IO；
Net系统；
使用系统文本；
使用Utilities.Web；
名称空间OpenContactsNet
{
公共类GmailExtract:IMailContactExtract
{
私有常量字符串ContinueUrl=”http://mail.google.com/mail?ui=html&；zy=l”；
私有常量字符串ExportUrl=”https://mail.google.com/mail/contacts/data/export?exportType=ALL&groupToExport=&out=GMAIL_CSV";
private const string LoginRefererUrl=”https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl<mpl=default<mplcache=2";
私有常量字符串LoginUrl=”https://www.google.com/accounts/ServiceLoginAuth?service=mail";
private const string UserAgent=“Mozilla/4.0（兼容；MSIE 7.0；Windows NT 5.1；EmbeddedWB 14.52来自：http://www.bsalsa.com/ EmbeddedWB 14.52；.NET CLR 1.1.4322；.NET CLR 2.0.50727；InfoPath.1；.NET CLR 1.0.3705；.NET CLR 3.0.04506.30）”；
#区域IMailContactExtract成员
公共bool摘录（网络凭证凭证、out-MailContactList列表）
{
布尔结果=假；
list=新邮件联系人列表（）；
尝试
{
CookieCollection cookies=新CookieCollection（）；
//准备登录表单数据
HttpValueCollection loginFormValues=新的HttpValueCollection（）；
loginFormValues[“ltmpl”]=“默认值”；
loginFormValues[“ltmplcache”]=“2”；
loginFormValues[“continue”]=ContinueUrl；
loginFormValues[“服务”]=“邮件”；
loginFormValues[“rm”]=“false”；
loginFormValues[“hl”]=“en”；
loginFormValues[“Email”]=凭证.UserName；
loginFormValues[“Passwd”]=凭证.密码；
loginFormValues[“PersistentCookie”]=“true”；
loginFormValues[“rmShowed”]=“1”；
loginFormValues[“null”]=“登录”；
//转换为字节
byte[]loginPostData=Encoding.UTF8.GetBytes（loginFormValues.ToString（true））；
HttpWebRequest loginRequest=（HttpWebRequest）WebRequest.Create（LoginUrl）；
loginRequest.Method=“POST”；
loginRequest.UserAgent=用户代理；
loginRequest.Referer=LoginRefererUrl；
loginRequest.ContentType=“应用程序/x-www-form-urlencoded”；
loginRequest.ContentLength=loginPostData.Length；
loginRequest.AllowAutoRedirect=false；
//创建cookie容器
loginRequest.CookieContainer=新CookieContainer（）；
//将post数据添加到请求
溪流；
使用（stream=loginRequest.GetRequestStream（））
{
stream.Write（loginPostData，0，loginPostData.Length）；
}
HttpWebResponse loginResponse=（HttpWebResponse）loginRequest.GetResponse（）；
cookies.Add（loginResponse.cookies）；
//创建导出Google CSV页面的请求
HttpWebRequest contactsRequest=（HttpWebRequest）WebRequest.Create（ExportUrl）；
contactsRequest.Method=“GET”；
contactsRequest.UserAgent=用户代理；
contactsRequest.Referer=loginResponse.ResponseUri.ToString（）；
//使用从登录页面获取的cookie
contactsRequest.CookieContainer=新CookieContainer（）；
foreach（cookies中的Cookie）
{
contactsRequest.CookieContainer.Add（cookie）；
}
HttpWebResponse exportResponse=（HttpWebResponse）contactsRequest.GetResponse（）；
//从响应流读取数据
字符串csvData；
使用（Stream responseStream=exportResponse.GetResponseStream（））
{
使用（StreamReader streamRead=新StreamReader（responseStream））
{
csvData=streamRead.ReadToEnd（）；
}
}
//解析谷歌csv
string[]line=csvData.Split（'\n'）；
foreach（行中的字符串行）
{
string[]value=line.Split（'，'）；
如果（值。长度<2）
{
继续；
}
MailContact MailContact=新的MailContact（）；
mailContact.Email=值[1]；
mailContact.Name=值[0]；
列表。添加（邮件联系人）；
}
结果=真；
}
捕获（例外e）
{
投掷e；
}
返回结果；
}
#端区
}
}
我不熟悉谷歌的api，也不了解C。
但是，请检查您将表单发送到的URL。
看起来你的身份验证有效。否则你会得到403分。
401表示您（作为经过身份验证的用户）不允许访问请求的资源。
10.4.2 401未经授权

请求需要用户身份验证。响应必须包括WWW Authenticate标头字段（第14.47节），其中包含适用于请求资源的质询。客户可能会重复
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using Utilities.Web;

namespace OpenContactsNet
{
    public class GmailExtract : IMailContactExtract
    {
        private const string ContinueUrl = "http://mail.google.com/mail?ui=html&amp;zy=l";
        private const string ExportUrl = "https://mail.google.com/mail/contacts/data/export?exportType=ALL&groupToExport=&out=GMAIL_CSV";
        private const string LoginRefererUrl = "https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&ltmpl=default&ltmplcache=2";
        private const string LoginUrl = "https://www.google.com/accounts/ServiceLoginAuth?service=mail";
        private const string UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; EmbeddedWB 14.52 from: http://www.bsalsa.com/ EmbeddedWB 14.52; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 1.0.3705; .NET CLR 3.0.04506.30)";

        #region IMailContactExtract Members

        public bool Extract( NetworkCredential credential, out MailContactList list )
        {
            bool result = false;
            list = new MailContactList();

            try
            {
                CookieCollection cookies = new CookieCollection();

                // Prepare login form data
                HttpValueCollection loginFormValues = new HttpValueCollection();
                loginFormValues[ "ltmpl" ] = "default";
                loginFormValues[ "ltmplcache" ] = "2";
                loginFormValues[ "continue" ] = ContinueUrl;
                loginFormValues[ "service" ] = "mail";
                loginFormValues[ "rm" ] = "false";
                loginFormValues[ "hl" ] = "en";
                loginFormValues[ "Email" ] = credential.UserName;
                loginFormValues[ "Passwd" ] = credential.Password;
                loginFormValues[ "PersistentCookie" ] = "true";
                loginFormValues[ "rmShown" ] = "1";
                loginFormValues[ "null" ] = "Sign In";

                // Convert to bytes
                byte[] loginPostData = Encoding.UTF8.GetBytes( loginFormValues.ToString( true ) );

                HttpWebRequest loginRequest = ( HttpWebRequest ) WebRequest.Create( LoginUrl );
                loginRequest.Method = "POST";
                loginRequest.UserAgent = UserAgent;
                loginRequest.Referer = LoginRefererUrl;
                loginRequest.ContentType = "application/x-www-form-urlencoded";
                loginRequest.ContentLength = loginPostData.Length;
                loginRequest.AllowAutoRedirect = false;

                // Create cookie container
                loginRequest.CookieContainer = new CookieContainer();

                // Add post data to request
                Stream stream;
                using ( stream = loginRequest.GetRequestStream() )
                {
                    stream.Write( loginPostData, 0, loginPostData.Length );
                }

                HttpWebResponse loginResponse = ( HttpWebResponse ) loginRequest.GetResponse();

                cookies.Add( loginResponse.Cookies );

                // Create request to export Google CSV page
                HttpWebRequest contactsRequest = ( HttpWebRequest ) WebRequest.Create( ExportUrl );
                contactsRequest.Method = "GET";
                contactsRequest.UserAgent = UserAgent;
                contactsRequest.Referer = loginResponse.ResponseUri.ToString();

                // use cookie gotten from login page
                contactsRequest.CookieContainer = new CookieContainer();
                foreach ( Cookie cookie in cookies )
                {
                    contactsRequest.CookieContainer.Add( cookie );
                }

                HttpWebResponse exportResponse = ( HttpWebResponse ) contactsRequest.GetResponse();

                // Read data from response stream
                string csvData;
                using ( Stream responseStream = exportResponse.GetResponseStream() )
                {
                    using ( StreamReader streamRead = new StreamReader( responseStream ) )
                    {
                        csvData = streamRead.ReadToEnd();
                    }
                }

                // parse google csv
                string[] lines = csvData.Split( '\n' );
                foreach ( string line in lines )
                {
                    string[] values = line.Split( ',' );
                    if ( values.Length < 2 )
                    {
                        continue;
                    }

                    MailContact mailContact = new MailContact();
                    mailContact.Email = values[ 1 ];
                    mailContact.Name = values[ 0 ];
                    list.Add( mailContact );
                }

                result = true;
            }
            catch (Exception e)
            {
                throw e;
            }

            return result;
        }

        #endregion
    }
}

public class GmailExtract : IMailContactExtract
    {
        private const string ContinueUrl = "https://mail.google.com/mail/?"; 
        private const string ExportUrl = "https://mail.google.com/mail/contacts/data/export?exportType=ALL&groupToExport=&out=GMAIL_CSV";
        private const string LoginRefererUrl = "https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&continue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&ltmpl=default&ltmplcache=2";
        private const string LoginUrl = "https://www.google.com/accounts/ServiceLoginAuth?service=mail";
        private const string UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)";

        #region IMailContactExtract Members

        public bool Extract( NetworkCredential credential, out MailContactList list)
        {
            bool result = false;
            list = new MailContactList();

            DateTime jsStartDate = new DateTime(1970, 1, 1);
            TimeSpan endTs = DateTime.Now.Subtract(jsStartDate);
            TimeSpan startTs = DateTime.Now.AddMinutes(-2).Subtract(jsStartDate);

            try
            {
                CookieCollection cookies = new CookieCollection();

                // Prepare login form data
                HttpValueCollection loginFormValues = new HttpValueCollection();
                loginFormValues["Email"] = credential.UserName;
                loginFormValues["Passwd"] = credential.Password;
                loginFormValues["asts"] = "";
                loginFormValues["continue"] = ContinueUrl;
                loginFormValues["dsh"] = "1461574034599761425";
                loginFormValues["hl"] = "en";
                loginFormValues["ltmpl"] = "default";
                loginFormValues["ltmplcache"] = "2";
                loginFormValues["rm"] = "false";
                loginFormValues["rmShown"] = "1";
                loginFormValues["service"] = "mail";
                loginFormValues["signIn"] = "Sign In";
                loginFormValues["scc"] = "1";
                loginFormValues["ss"] = "1";
                loginFormValues["GALX"] = "rBTUs4OAJBI";
                loginFormValues["ltmpl"] = "default";
                loginFormValues["ltmpl"] = "default";

                // Convert to bytes
                byte[] loginPostData = Encoding.UTF8.GetBytes( loginFormValues.ToString( true ) );

                HttpWebRequest loginRequest = ( HttpWebRequest ) WebRequest.Create( LoginUrl );
                loginRequest.Method = "POST";
                loginRequest.UserAgent = UserAgent;
                loginRequest.Referer = LoginRefererUrl;
                loginRequest.ContentType = "application/x-www-form-urlencoded";
                loginRequest.ContentLength = loginPostData.Length;
                loginRequest.AllowAutoRedirect = false;

                // Create cookie container
                loginRequest.CookieContainer = new CookieContainer();
                loginRequest.CookieContainer.Add(new Cookie("GMAIL_LOGIN", "T" + startTs.Milliseconds.ToString() + "/" + startTs.Milliseconds.ToString() + "/" + endTs.Milliseconds.ToString(), "/", ".google.com"));
                loginRequest.CookieContainer.Add(new Cookie("GALX", "rBTUs4OAJBI", "/accounts", ".google.com"));

                // Add post data to request
                Stream stream;
                using ( stream = loginRequest.GetRequestStream())
                {
                    stream.Write( loginPostData, 0, loginPostData.Length);
                }

                HttpWebResponse loginResponse = ( HttpWebResponse ) loginRequest.GetResponse();

                cookies.Add( loginResponse.Cookies );

                // Create request to export Google CSV page
                HttpWebRequest contactsRequest = ( HttpWebRequest ) WebRequest.Create( ExportUrl );
                contactsRequest.Method = "GET";
                contactsRequest.UserAgent = UserAgent;
                contactsRequest.Referer = loginResponse.ResponseUri.ToString();

                // use cookie gotten from login page
                contactsRequest.CookieContainer = new CookieContainer();
                foreach ( Cookie cookie in cookies )
                {
                    contactsRequest.CookieContainer.Add( cookie );
                }

                HttpWebResponse exportResponse = ( HttpWebResponse ) contactsRequest.GetResponse();

                // Read data from response stream
                string csvData;
                using ( Stream responseStream = exportResponse.GetResponseStream())
                {
                    using ( StreamReader streamRead = new StreamReader( responseStream ) )
                    {
                        csvData = streamRead.ReadToEnd();
                    }
                }

                // parse google csv
                string[] lines = csvData.Split( '\n' );
                foreach ( string line in lines )
                {
                    string[] values = line.Split( ',' );
                    if ( values.Length < 2 )
                    {
                        continue;
                    }

                    MailContact mailContact = new MailContact();
                    mailContact.Email = values[ 28 ];
                    mailContact.Name = values[ 0 ];
                    if (mailContact.Email.Trim().Length > 0)
                    {

                         list.Add(mailContact);

                    }
                }

                result = true;
            }
            catch
            {
            }

            return result;
        }

        #endregion
    }