using (var httpClient = new HttpClient(new HttpClientHandler
            {
                AutomaticDecompression = DecompressionMethods.GZip,
            }))
            {
                var url = "https://dl.reg.163.com/l";
                var publicKey = GetPublicKey();
                var pwd = EncryptPassword(publicKey, password);
                var initResult = await Init();
                var gtResult = await GetGtResult(username);

                if (gtResult.ret != "201")
                    throw new HttpRequestException(gtResult.ret);

                httpClient.DefaultRequestHeaders.Clear();
                httpClient.DefaultRequestHeaders.Add("Connection", "keep-alive");
                httpClient.DefaultRequestHeaders.Add("Origin", "https://dl.reg.163.com");
                httpClient.DefaultRequestHeaders.Add("Accpet", "*/*");
                httpClient.DefaultRequestHeaders.Add("Referer", "https://dl.reg.163.com/src/mp-agent-finger.html?WEBZJVersion=1519802537259&pkid=hJWZDGT&product=subscribe");
                httpClient.DefaultRequestHeaders.Add("Accept-Language", "zh-CN,zh;q=0.9");
                httpClient.DefaultRequestHeaders.Add("Cookie", cookies);

                var postdata = new
                {
                    un = username,
                    pw = pwd,
                    pd = "subscribe",
                    l = 1,
                    d = 10,
                    t = Util.Helpers.Time.GetUnixTimestamp13().ToString(),
                    pkid = "hJWZDGT",
                    domains = "",
                    tk = gtResult.tk,
                    pwdKeyUp = 1,
                    topURL = "http://mp.163.com/login.html?url=http://mp.163.com/index.html"
                };

                var stringContent = new StringContent(JsonConvert.SerializeObject(postdata), Encoding.UTF8, "application/json");

                var response = await httpClient.PostAsync(url, stringContent);

                var responseContent = await response.Content.ReadAsStringAsync();

                var result = JsonConvert.DeserializeObject<LoginResult>(responseContent);
                return result;
            }