学步园

关于HttpWebRequest详细用法可以参考MSDN和我的另一篇
这个例子只是一个客户端发起请求，服务端简单处理相应的例子。

客户端请求

            string reqestMsg = "Tom";
            string responseMsg = string.Empty;
            byte[] buffer = Encoding.UTF8.GetBytes(reqestMsg);

            try
            {
　　　　　　//把请求地址换成博客园的 如http://www.cnblogs.com 就返回了整个页面数据　　
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:6603/WebServer.aspx");
                request.Method = "POST";
                request.ContentLength = buffer.Length;

                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(buffer, 0, buffer.Length);
                }

                HttpWebResponse resonse = (HttpWebResponse)request.GetResponse();
                Stream responseStream = resonse.GetResponseStream();
                
                using (StreamReader sr = new StreamReader(responseStream))
                {
                    responseMsg = sr.ReadToEnd();
                }

                resonse.Close();
            }
            catch (Exception ex)
            {
                responseMsg = ex.Message;
            }

            Response.Write(responseMsg);

服务端相应

            string responseMsg = "NO MSG";

            if (Request.InputStream != null)
            {
                byte[] buffer = new byte[Request.InputStream.Length];
                Request.InputStream.Read(buffer, 0, buffer.Length);
                string msg = Encoding.UTF8.GetString(buffer);
                msg = msg.Replace("+", "%2B").Replace(" ", "%20");
                responseMsg = SayHello(msg);
            }

            Response.Write(responseMsg);