thắc mắc [C#] Thắc mắc về gửi Http Request

curl -v \
     -H 'Host: restapi.some-site.com' \
     -H 'Connection: keep-alive' \
     -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' \
     -H 'Accept-Language: en-GB,en-US;q=0.8,en;q=0.6' \
     -e localhost \
     -A 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.65 Safari/537.36' \
     'http://restapi.some-site.com/getsomething?argument=value&argument2=value'

using System.Net.Http;

var client = new HttpClient();

// Create the HttpContent for the form to be posted.
var requestContent = new FormUrlEncodedContent(new [] {
    new KeyValuePair<string, string>("text", "This is a block of text"),
});

// Get the response.
HttpResponseMessage response = await client.PostAsync(
    "http://api.repustate.com/v2/demokey/score.json",
    requestContent);

// Get the response content.
HttpContent responseContent = response.Content;

// Get the stream of the content.
using (var reader = new StreamReader(await responseContent.ReadAsStreamAsync()))
{
    // Write the output.
    Console.WriteLine(await reader.ReadToEndAsync());
}

curl 'https://masothue.com/Ajax/Search' -X POST -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:93.0) Gecko/20100101 Firefox/93.0' -H 'Accept: application/json, text/javascript, */*; q=0.01' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' -H 'X-Requested-With: XMLHttpRequest' -H 'Origin: https://masothue.com' -H 'Connection: keep-alive' -H 'Referer: https://masothue.com/' -H 'Cookie: PHPSESSID=8aqo42d31nhqlorrqpb2ufug6f' -H 'Sec-Fetch-Dest: empty' -H 'Sec-Fetch-Mode: cors' -H 'Sec-Fetch-Site: same-origin' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache' -H 'TE: trailers' --data-raw 'q=6300177249&type=auto&token=OSftBapwEl&force-search=1'

{"success":1,"typeId":6,"type":"m\u00e3 s\u1ed1 thu\u1ebf","url":"\/6300177249-cong-ty-co-phan-thuong-mai-dau-tu-dau-khi-nam-song-hau","force-search":"1","numRows":1}

private Tuple<string, string> GetToken()
        {
            var client = new RestClient("https://masothue.com/Ajax/Token");
            client.Timeout = -1;
            var request = new RestRequest(Method.POST);
            client.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36";
            request.AddHeader("Accept", "application/json, text/javascript, */*; q=0.01");
            request.AddHeader("Accept-Language", "en-US,en;q=0.5");
            request.AddHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
            request.AddHeader("X-Requested-With", "XMLHttpRequest");
            request.AddHeader("Origin", "https://masothue.com");
            request.AddHeader("Connection", "keep-alive");
            request.AddHeader("Referer", "https://masothue.com/");
            request.AddHeader("Sec-Fetch-Dest", "empty");
            request.AddHeader("Sec-Fetch-Mode", "cors");
            request.AddHeader("Sec-Fetch-Site", "same-origin");
            request.AddHeader("Pragma", "no-cache");
            request.AddHeader("Cache-Control", "no-cache");
            request.AddHeader("TE", "trailers");
            IRestResponse response = client.Execute(request);

            string content = response.Content;
            DTO.TokenResponse tokenResponse = JsonConvert.DeserializeObject<DTO.TokenResponse>(content);
            string Token = tokenResponse.token;
            string cookies = "";
            foreach (var c in response.Cookies)
            {
                if (c.Name.Contains("SESSID") == true)
                {
                    cookies = c.Name + "=" + c.Value.ToString();
                }
            }

            Tuple<string, string> result = new Tuple<string, string>(Token, cookies);

            return result;

        }

        private string GetResponse(string MaSoThue, Tuple<string,string> TokenCookies)
        {
            var client = new RestClient("https://masothue.com/Ajax/Search");
            client.Timeout = -1;
            var request = new RestRequest(Method.POST);
            client.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36";
            request.AddHeader("Accept", "application/json, text/javascript, */*; q=0.01");
            request.AddHeader("Accept-Language", "en-US,en;q=0.5");
            request.AddHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
            request.AddHeader("X-Requested-With", "XMLHttpRequest");
            request.AddHeader("Origin", "https://masothue.com");
            request.AddHeader("Connection", "keep-alive");
            request.AddHeader("Referer", "https://masothue.com/");
            request.AddHeader("Cookie", TokenCookies.Item2);
            request.AddHeader("Sec-Fetch-Dest", "empty");
            request.AddHeader("Sec-Fetch-Mode", "cors");
            request.AddHeader("Sec-Fetch-Site", "same-origin");
            request.AddHeader("Pragma", "no-cache");
            request.AddHeader("Cache-Control", "no-cache");
            request.AddHeader("TE", "trailers");
            string body = string.Format(@"q={0}&type=auto&token={1}&force-search=1", MaSoThue, TokenCookies.Item1);
            request.AddParameter("application/x-www-form-urlencoded; charset=UTF-8", body, ParameterType.RequestBody);
            IRestResponse response = client.Execute(request);

            string result = response.Content;

            return result;
        }

        public static HttpClient _httpClient;
        static void Main(string[] args)
        {
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol =
            SecurityProtocolType.Tls
            | SecurityProtocolType.Tls11
            | SecurityProtocolType.Tls12
            | SecurityProtocolType.Ssl3;
            ServicePointManager
            .ServerCertificateValidationCallback +=
            (sender, cert, chain, sslPolicyErrors) => true;

            _httpClient = new HttpClient();
            _httpClient.DefaultRequestHeaders.Add("X-Requested-With", "XMLHttpRequest");
            _httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36");
            string token = GetToken().GetAwaiter().GetResult();
            Console.WriteLine(token);

            string info = GetInfo(token).GetAwaiter().GetResult();
            Console.WriteLine(info);
            Console.ReadLine();
        }
        private static async Task<string> GetToken()
        {
            string urlGetToken = "https://masothue.com/Ajax/Token";
            var payload = new FormUrlEncodedContent(new []
            {
                new KeyValuePair<string, string>("r", "i4lkt8")
            }) ;
            var request = await _httpClient.PostAsync(urlGetToken, payload);
            var responseContent = await request.Content.ReadAsStringAsync();
            dynamic parseData = JsonConvert.DeserializeObject<dynamic>(responseContent);
            string token = Convert.ToString(parseData.token);
            return token;
        }
        private static async Task<string> GetInfo(string token)
        {
            string urlGetToken = "https://masothue.com/Ajax/Search";
            var payload = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("q", "6300177249"),
                new KeyValuePair<string, string>("type", "auto"),
                new KeyValuePair<string, string>("token", token),
                new KeyValuePair<string, string>("force-search", "1")

            });
            var request = await _httpClient.PostAsync(urlGetToken, payload);
            var responseContent = await request.Content.ReadAsStringAsync();
            return responseContent;
        }