C#代碼發送 http,https請求

C# 代碼發送Request請求 獲得響應信息【包括https,http請求】

namespace WllDatetime
    {
       public class WllRequest
        {
            private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
            {
                return true; //總是接受  
            }
            public static string HttpRequest(string url)
            {
                HttpWebRequest httpRequest;
                if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
                {
                    ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                    httpRequest = WebRequest.Create(url) as HttpWebRequest;
                    httpRequest.ProtocolVersion = HttpVersion.Version10;
                }
                else
                    httpRequest = WebRequest.Create(url) as HttpWebRequest;
                httpRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36";
                HttpWebResponse httpResp = (HttpWebResponse)httpRequest.GetResponse();
                Stream responseStream = httpResp.GetResponseStream(); //獲得響應的流
                try
                {
                    StringBuilder strBuff = new StringBuilder();
                    using (StreamReader responseStreamReader = new StreamReader(responseStream, Encoding.UTF8))
                    {
                        char[] cbuffer = new char[256];
                        int byteRead = responseStreamReader.Read(cbuffer, 0, 256);
                        while (byteRead != 0)
                        {
                            string strResp = new string(cbuffer, 0, byteRead);
                            strBuff.Append(strResp);
                            byteRead = responseStreamReader.Read(cbuffer, 0, 256);
                        }
                    }
                    return strBuff.ToString();
                }
                catch
                {
                    return null;
                }
            }
        }
    }