关于HttpWebRequest 向百度贴吧Post的问题

Question

POST /f HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, application/x-silverlight-2-b2, application/x-silverlight, */*
Referer: http://tieba.baidu.com/f?kz=452765250
Accept-Language: zh-cn
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022; InfoPath.2; .NET CLR 1.1.4322)
Proxy-Connection: Keep-Alive
Content-Length: 820
Host: tieba.baidu.com
Pragma: no-cache
Cookie: BAIDUID=64DEBFC3CAEF043F46505983CFF1D4C8:FG=1; BDSTAT=6b1d638aece50b7d2bfe6e59d32e91c2a7efce1b8916fdfaab51f3deb68f458a; BD_UTK_DVT=1; _BDSC=1ct=385875968&tn=baiduSubmitPost&word=%B3%A4%B4%BA%D1%C7%CC%A9&lm=213195&z=452765250&sc=2&cm=0&rn=290153473&bs=4B8D54AF55BCD450CF1F6CC0094F1A80211F6A594427634C43B915398F153F3E1E1956C85D1F4510F410D6AC387835EDEEFFCE38951FD2D0119824C801&str2=13&rs3=0&str3=64DEBFC3CAEF043F46505983CFF1D4C8&str4=24757011213085648234&bu=http%3A%2F%2Ftieba.baidu.com%2Ff%3Fkz%3D452765250&ti=%BB%D8%B8%B4%A3%BA%BA%E9%B6%BC%C0%AD%CB%B9%B9%FA%B0%C2%D0%C5%D0%C4%CA%AE%D7%E3+%D0%A7%C1%A6%D6%D0%B3%AC%C7%F2%D4%B1%B3%C9%C3%D8%C3%DC%CE%E4%C6%F7%28%BC%D3%D3%CD%A1%A2%BF%A8%B0%CD%A3%A1%29&ti1=%BB%D8%B8%B4%A3%BA%BA%E9%B6%BC%C0%AD%CB%B9%B9%FA%B0%C2%D0%C5%D0%C4%CA%AE%D7%E3+%D0%A7%C1%A6%D6%D0%B3%AC%C7%F2%D4%B1%B3%C9%C3%D8%C3%DC%CE%E4%C6%F7%28%BC%D3%D3%CD%A1%A2%BF%A8%B0%CD%A3%A1%29+&co=%B6%A5&str1=http%3A%2F%2F&word1=eubr&Submit3=%B7%A2%B1%ED%CC%F9%D7%D3--------------------------------------------------------------------------POST /f HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, application/x-silverlight-2-b2, application/x-silverlight, */*
Referer: http://tieba.baidu.com/f?kz=452891772
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022; InfoPath.2; .NET CLR 1.1.4322)
Accept-Language: zh-cn
Accept-Encoding: gzip,deflate
UA-CPU: x86
Pragma: no-cache
Content-Type: application/x-www-form-urlencoded
Host: tieba.baidu.com
Cookie: BAIDUID=2BD2996A1DDA186B601BD183E6EC4BD1:FG=1; BDSTAT=6b1d638aece50b7d2bfe6e59d32e91c2a7efce1b8916fdfaab51f3deb68f458a; BD_UTK_DVT=1; _BDSC=1
Content-Length: 662ct=385875968&tn=baiduSubmitPost&word=%b3%a4%b4%ba%d1%c7%cc%a9&lm=213195&z=452891772&sc=2&cm=0&rn=404441725&bs=B6EC5D7588FD7A9031B3723D22CF4C54B8681D1E49EB8CBF6E2372DC3B5CE67CA8DDDB188952509E49E644CDA5F2A5E88F6560E3C6FF0F861E86294585B63FF70000004D479DE0D1&str2=&rs3=0&str3=2BD2996A1DDA186B601BD183E6EC4BD1&str4=35713253522172550874&ti=%bb%d8%b8%b4%a3%ba+%cd%ed%c9%cf%d4%db%c3%c7%d2%bb%cd%ac%ce%aa%b9%fa%b0%c2%bc%d3%d3%cd+%ce%d2%d4%da12%cc%a8&ti1=%bb%d8%b8%b4%a3%ba%cd%ed%c9%cf%d4%db%c3%c7%d2%bb%cd%ac%ce%aa%b9%fa%b0%c2%bc%d3%d3%cd+%ce%d2%d4%da12%cc%a8+&co=ding&str1=&word1=he3b&bu=http%3a%2f%2ftieba.baidu.com%2ff%3fkz%3d452891772&Submit3=%b7%a2%b1%ed%cc%fb%d7%d3
第一个是在ie中直接回复接收到的，第二个是在我做的程序中接收到的，除了Proxy-Connection: Keep-Alive的头没有加进去以外其他的都已经加进去了，可是在ie中可以回复成功，在我做的程序里就会把我的回复当做广告帖返回的是相应提示的html，我不知道是Http header的问题还是需要有我没注意到的

Answer 1

以下是执行的代码：
            Uri URI = new Uri(URL);
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URI);
            
            request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, application/x-silverlight-2-b2, application/x-silverlight, */*";
            if (strReferer.Length == 0)
            {
                request.Referer = "https://passport.baidu.com/";
            }
            else
            {
                request.Referer = strReferer;
            }
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022; InfoPath.2; .NET CLR 1.1.4322)";            request.Headers["Accept-Language"] = "zh-cn";
            if (GZip)
            {
                request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
                request.Headers.Add("UA-CPU:   x86");
                request.Headers.Add(HttpRequestHeader.Pragma, "no-cache");
                request.ServicePoint.Expect100Continue = false;
                request.KeepAlive = true;            }            //设置cookie
            if (request.CookieContainer == null)
            {
                request.CookieContainer = new CookieContainer();
            }
 
                foreach (System.Net.Cookie cookie in Cookies)
                {
                    cookie.Domain = URI.Host;
                    if (cookie.Value.Length != 0)
                    {
                        request.CookieContainer.Add(cookie);
                    }                }            //提交的数据
            if (!string.IsNullOrEmpty(PostData))
            {
                request.ContentType = "application/x-www-form-urlencoded";
                request.Method = "POST";
                byte[] lbPostBuffer = encoding.GetBytes(PostData);                request.ContentLength = lbPostBuffer.Length;                Stream PostStream = request.GetRequestStream();
                PostStream.Write(lbPostBuffer, 0, lbPostBuffer.Length);
                PostStream.Close();
            }

Answer 2

向百度贴吧回复的url是http://tieba.baidu.com/f

Answer 3

有个细节：
request.ContentType = "application/x-www-form-urlencoded"; 
request.Method = "POST"; 
byte[] lbPostBuffer = encoding.GetBytes(PostData); 
这个encoding是什么？
一般而言，application/x-www-form-urlencoded编码，特别是含有汉字的，需要使用
System.Web.HttpUtility.UrlEncode()方法编码，引用System.Web.Dll。
估计是你的程序中含有服务器无法转换的汉字字符！

Answer 4

恩，其实我在调用时就已经处理了foreach (string key in _baiduParams.Keys)
{
    strPostData += string.Format("&{0}={1}", key, HttpUtility.UrlEncode(_baiduParams[key],Encoding.Default));
}然后encoding是System.Text.Encoding.Default，可是返回的结果总是说是广告帖，如果验证码输入错误的话会返回验证码错的结果，就说明提交的data应该没错