后台请求数据的几个实例(含获取数据的压缩方式的处理)

                string url = "http://gps.cn/api/";
                string param = HttpContext.Current.Request.Url.Query;
                url = url + param;
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                //request.Method = "GET";
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.CookieContainer = new CookieContainer();
                //request.CookieContainer.Add(new Cookie("ASP.NET_SessionId", "bqf4jp55tspvuy55ayo3gb45", "", "gps.zto.cn"));
                request.CookieContainer.Add(new Cookie("ASP.NET_SessionId", ASPNET_SessionValue, "", "gps.cn"));
                request.CookieContainer.Add(new Cookie("Hm_lvt_d796fdb8c57000115377e0cc55ab56f0", "1414852427", "", "gps.cn"));
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                request.Connection = "KeepAlive";
                request.Headers["Accept-Encoding"] = "gzip, deflate";
                request.Headers["Accept-Language"] = "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3";
                request.Host = "gps.zto.cn";
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0";
                //System.Net.WebProxy proxy = new WebProxy("8.7.16.16", 80);
                //request.Proxy = proxy;
                //获取post来的数据再发送
                byte[] data = Request.BinaryRead(Request.TotalBytes);
                request.ContentLength = data.Length;
                Stream newStream = request.GetRequestStream();
                //string source = Encoding.UTF8.GetString(input);
                // 发送数据
                newStream.Write(data, 0, data.Length);
                newStream.Close();
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream responseStream = null;
                if ("gzip".Equals(response.ContentEncoding))
                {
                    responseStream = new System.IO.Compression.GZipStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
                }
                else if ("deflate".Equals(response.ContentEncoding))
                {
                    responseStream = new System.IO.Compression.DeflateStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
                }
                else
                {
                    responseStream = response.GetResponseStream();
                }
                if (responseStream != null)
                {
                    result = new StreamReader(responseStream, Encoding.GetEncoding(response.CharacterSet)).ReadToEnd().ToString();
                }

            string url = "http://gps.cn/map";
            string param = HttpContext.Current.Request.Url.Query;
            url = url + param;
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.CookieContainer = new CookieContainer();
            //request.CookieContainer.Add(new Cookie("ASP.NET_SessionId", "bqf4jp55tspvuy55ayo3gb45", "", "gps.zto.cn"));
            request.CookieContainer.Add(new Cookie("ASP.NET_SessionId", ASPNET_SessionValue, "", "gps.cn"));
            request.CookieContainer.Add(new Cookie("Hm_lvt_d796fdb8c57000115377e0cc55ab56f0", "1414852427", "", "gps.cn"));
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            request.Connection = "KeepAlive";
            request.Headers["Accept-Encoding"] = "gzip, deflate";
            request.Headers["Accept-Language"] = "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3";
            request.Host = "gps.cn";
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0";
            //System.Net.WebProxy proxy = new WebProxy("8.7.16.16", 80);
            //request.Proxy = proxy;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream responseStream = null;
            string result = string.Empty;
            if ("gzip".Equals(response.ContentEncoding))
            {
                responseStream = new System.IO.Compression.GZipStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
            }
            else if ("deflate".Equals(response.ContentEncoding))
            {
                responseStream = new System.IO.Compression.DeflateStream(response.GetResponseStream(), System.IO.Compression.CompressionMode.Decompress);
            }
            else
            {
                responseStream = response.GetResponseStream();
            }
            if (responseStream != null)
            {
                result = new StreamReader(responseStream, Encoding.GetEncoding(response.CharacterSet)).ReadToEnd().ToString();
            }