远程服务器返回异常: (411) 所需的长度 这是什么东东？ ！ 急

远程服务器返回错误: (411) 所需的长度 这是什么错误？？ 在线等！ 急~~~~

HttpWebRequest wreq = (HttpWebRequest)WebRequest.Create("Http://192.168.213.99:8090");
  wreq.Method = "POST";
  wreq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8";
  HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse();



  打断点调式 执行到这句“ HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse();” 出错。

  “ 远程服务器返回错误: (411) 所需的长度”

[解决办法]
如果是post的话，你的参数没有
需要将参数写入request里面

C# code

   if (method.ToUpper() == "POST")                {                    request.Method = "POST";                    request.ContentType = "application/x-www-form-urlencoded";                    request.ContentLength = data.Length;                    /*  可接收可压缩HTML*/                    request.Headers.Add("Accept-Language", "zh-cn");                    request.Headers.Add("Accept-Encoding", "gzip,deflate");                    /* 柏志诚  */                    Stream newStream = request.GetRequestStream();                    newStream.Write(data, 0, data.Length);                    newStream.Close();                }
[解决办法]
request.Method = "GET"; 
HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create( "" );
req.Method = "GET";
using (WebResponse wr = req.GetResponse())
{
 } 

post
string param = "";
byte[] bs = Encoding.ASCII.GetBytes(param);

HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create( "" );
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;
using (Stream reqStream = req.GetRequestStream())
{
 reqStream.Write(bs, 0, bs.Length);
}

[解决办法]
C# code
public String RGetPageCode(String PageURL, String Charset)    {        String strHtml = "";        ASCIIEncoding encoding = new ASCIIEncoding();        //byte[] bytes = Encoding.UTF8.GetBytes(Charset);        byte[] bytes = encoding.GetBytes(Charset);        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(PageURL);        request.Method = "POST";        request.ContentLength = bytes.Length;        request.ContentType = "text/xml";        using (Stream requestStream = request.GetRequestStream())        {            requestStream.Write(bytes, 0, bytes.Length);        }        HttpWebResponse response = (HttpWebResponse)request.GetResponse();        if (response.StatusCode == HttpStatusCode.OK)        {           // strHtml = String.Format("POST failed. Received HTTP {0}",response.StatusCode);            if (response != null)            {                if (response.StatusCode == HttpStatusCode.OK && request.HaveResponse)                {                    using (StreamReader sr = new StreamReader(response.GetResponseStream(), encoding))                    {                        if (sr != null)                        {                            strHtml = sr.ReadToEnd();                        }                    }                }                response.Close();            }        }        return strHtml;    }