解决下载经过GZip压缩后的网页乱码问题

目前很多网站默认采用GZip压缩，如果不进行解压缩，下载后生成的html页面打开后会出现中文乱码

乱码前：

            string url = "http://quote.eastmoney.com/stocklist.html";
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(url);
                var response = client.GetAsync(url).Result;

                var content = response.Content.ReadAsStringAsync().Result;
                File.WriteAllText(@"C:\stock.html", content, Encoding.Default);

            }

乱码效果：

解决代码：

            string url = "http://quote.eastmoney.com/stocklist.html";
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(url);

                //关键代码1：设置请求头采用GZip和deflate两种压缩算法
                client.DefaultRequestHeaders.Add("Accept-Encoding", "gzip, deflate");
                var response = client.GetAsync(url).Result;

                var fileStream = response.Content.ReadAsStreamAsync().Result;

                //关键代码2：对文件流采用GZip算法解压
                GZipStream gzip = new GZipStream(fileStream, CompressionMode.Decompress);

                using (StreamReader reader = new StreamReader(gzip, Encoding.GetEncoding("gb2312")))//中文编码处理
                {
                    File.WriteAllText(@"C:\stock.html", reader.ReadToEnd(), Encoding.Default);
                }
            }

 解决后效果：

乱码有的时候不能单单靠转File.WriteAllText(@"C:\stock.html", reader.ReadToEnd(), Encoding.GetEncoding("gb2312"));方式解决，具体情况具体分析，思维多发散发散。