HttpWebResponse的Post发包问题

Question

c#中用HttpWebResponse类进行Post发包，发包的数据格式是multipart/form-data；
有两个网址：
http://hpcgi2.nifty.com/tono-k/bbs/bbs.cgi
http://handaipfc.com/cgi-bin/imgboard.cgi
我已经写好了发包的方法，测试第一地址是发包成功的，但是对第二个地址却不成功，不知道什么原因，有没有高手帮忙看一下.
发包的数据：
-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="bbsaction"

post

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="page"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="view_mode"

as_cgi_defined

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="blood"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="parent"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="prebbsaction"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="amode"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="p1"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="p2"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="target"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="target_no"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="sf"

針つゆシ灰み

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="onetime_token"

aSB2BUxsBU

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="optB"

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="body"

昔を追憶する

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="name"

昔を追憶する

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="subject"

昔を追憶する

-----------------------------8d3bb8669ffe4f1
Content-Disposition: form-data; name="img"; filename=""
Content-Type: application/octet-stream

-----------------------------8d3bb8669ffe4f1--

Answer 1

private static string HttpPostTest(string url, int timeOut, NameValueCollection stringDict)
{
string responseContent;
var memStream = new MemoryStream();
var webRequest = (HttpWebRequest)WebRequest.Create(url);
// 边界符

var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
// 边界符

var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "\r\n");
var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");

        // 设置属性  
        webRequest.Method = "POST";
        webRequest.Timeout = timeOut;
        webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
        memStream.Write(beginBoundary, 0, beginBoundary.Length);
        // 写入字符串的Key  
        var stringKeyHeader = "\r\n--" + boundary +
                               "\r\nContent-Disposition: form-data; name=\"{0}\"" +
                               "\r\n\r\n{1}\r\n";

        foreach (byte[] formitembytes in from string key in stringDict.Keys
                                         select string.Format(stringKeyHeader, key, stringDict[key])
                                             into formitem
                                             select Encoding.UTF8.GetBytes(formitem))
        {
            memStream.Write(formitembytes, 0, formitembytes.Length);
        }

        // 写入最后的结束边界符  
        memStream.Write(endBoundary, 0, endBoundary.Length);

        webRequest.ContentLength = memStream.Length;
        string sss = System.Text.Encoding.Default.GetString(memStream.ToArray());
        var requestStream = webRequest.GetRequestStream();

        memStream.Position = 0;
        var tempBuffer = new byte[memStream.Length];
        memStream.Read(tempBuffer, 0, tempBuffer.Length);
        memStream.Close();

        requestStream.Write(tempBuffer, 0, tempBuffer.Length);
        requestStream.Close();

        var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();

        using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("shift_jis")))
        {
            responseContent = httpStreamReader.ReadToEnd();
        }

        httpWebResponse.Close();
        webRequest.Abort();
        return responseContent;
    }