C#使用GZIP解压缩完整读取网页内容

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/// <summary>
        /// C#使用GZIP解压缩完整读取网页内容
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetHtmlWithUtf(string url)
        {
            if (!(url.Contains("http://") || url.Contains("https://")))
            {
                url = "http://" + url;
            }
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.UserAgent = "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";
            req.Accept = "*/*";
            req.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");
            req.ContentType = "text/xml";

            string sHTML = string.Empty;
            using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
            {
                if (response.ContentEncoding.ToLower().Contains("gzip"))
                {
                    using (GZipStream stream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress))
                    {
                        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                        {
                            sHTML = reader.ReadToEnd();
                        }
                    }
                }
                else if (response.ContentEncoding.ToLower().Contains("deflate"))
                {
                    using (DeflateStream stream = new DeflateStream(response.GetResponseStream(), CompressionMode.Decompress))
                    {
                        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                        {
                            sHTML = reader.ReadToEnd();
                        }
                    }
                }
                else
                {
                    using (Stream stream = response.GetResponseStream())
                    {
                        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                        {
                            sHTML = reader.ReadToEnd();
                        }
                    }
                }
            }
            return sHTML;
        }