这是post 代码
if (req.Method == "POST" && data != null)
{
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] postBytes = encoding.GetBytes(data);
req.ContentLength = postBytes.Length;
Stream st = req.GetRequestStream();
st.Write(postBytes, 0, postBytes.Length);
st.Close();
}

            System.Net.ServicePointManager.ServerCertificateValidationCallback += (se, cert, chain, sslerror) =>
            {
                return true;
            };

            Encoding myEncoding = Encoding.GetEncoding("UFT-8");

            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            Stream resst = res.GetResponseStream();
            StreamReader sr = new StreamReader(resst, myEncoding);
            string str = sr.ReadToEnd();

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