【.NET】HttpWebRequest和HttpWebReponse的Get，Post请求

支持https几种安全协议的

/// <summary>
        /// Get请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="timeout"></param>
        /// <param name="encode"></param>
        /// <returns></returns>
        public string Request_Get(string url,int timeout, Encoding encode)
        {
            string result = "";
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            HttpWebResponse response = null;
            try
            {
                //设置ServicePoint实体
                ServicePointManager.Expect100Continue = true;//是否通过100-continue协议，在post请求前，会先请求是否包含这个头域
                ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };//回调统一方法
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;//Protocol设置安全协议

                //请求
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                request.Timeout = timeout;
                request.Proxy = null;
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0";
                
                //响应
                response = (HttpWebResponse)request.GetResponse();
                Stream stream = request.GetRequestStream();
                StreamReader streamReader = new StreamReader(stream, encode);
                return streamReader.ReadToEnd();
            }
            catch(Exception exc)
            {
                return exc.Message;
            }
            finally
            {
                if (response != null) { response.Close(); }
                if (request != null) { request.Abort(); }
            }
        }

        public static string Request_Post(string url,string Param, int timeout, Encoding encode)
        {
            byte[] p = encode.GetBytes(Param);

            //请求
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = null;
            Stream stream = null;
            //request.KeepAlive = true;//关掉在线的连接，用close,Abort代替
            request.Method = "POST";
            //*/*/如果是直接打开需要
            request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, */*";
            //请求类型
            request.ContentType = "application/x-www-form-urlencoded";
            //客户浏览器信息
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MAXTHON 2.0)";
            //长度,gzip和default会是-1
            request.ContentLength = p.Length;
            
            //响应
            try
            {
                //请求转成字节流，将参数写入，再返回响应给响应对象，按字节读出
                stream = request.GetRequestStream();
                stream.Write(p, 0, p.Length);
                stream.Close();
                response = (HttpWebResponse)request.GetResponse();
                StreamReader streamReader = new StreamReader(response.GetResponseStream(), encode);
                return streamReader.ReadToEnd();
            }
            catch(Exception exc)
            {
                return exc.Message;
            }
        }