How to Use C# to Solve Cloudflare Turnstile CAPTCHA Challenges

public static async Task<string> CallCapsolver()
{
    // // Send GET request
    // var todoItem = await GetTodoItemAsync(API_URL);
    // Console.WriteLine("GET Request Result:");
    // Console.WriteLine(todoItem);

    var data = new
    {
        clientKey = CAPSOLVER_API_KEY,
        task = new
        {
            type = "AntiTurnstileTaskProxyLess",
            websiteURL = PAGE_URL,
            websiteKey = SITE_KEY,
            metadata = new { action = "login" }
        }
    };

    // Send POST request
    var response = await PostTodoItemAsync("https://api.capsolver.com/createTask", data);
    Console.WriteLine("POST Request Result:");
    var responseString = await response.Content.ReadAsStringAsync();
    Console.WriteLine(responseString);
    JObject taskResp = JsonConvert.DeserializeObject<JObject>(responseString);
    var taskId = taskResp["taskId"].ToString();
    if (string.IsNullOrEmpty(taskId))
    {
        Console.WriteLine("No task ID received.");
        return "";
    }
    Console.WriteLine($"Created task ID: {taskId}");

    while (true)
    {
        await Task.Delay(1000); // Sleep for 1 second
        var resultData = new
        {
            clientKey = CAPSOLVER_API_KEY,
            taskId = taskId
        };

        // content = new StringContent(JsonConvert.SerializeObject(data), System.Text.Encoding.UTF8, "application/json");
        // response = await httpClient.PostAsync(uri, content);

        response = await PostTodoItemAsync("https://api.capsolver.com/getTaskResult", resultData);
        responseString = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseString);
        if (!response.IsSuccessStatusCode)
        {
            Console.WriteLine($"Failed to get task result: {responseString}");
            return "";
        }

        taskResp = JsonConvert.DeserializeObject<JObject>(responseString);
        Console.WriteLine(taskResp);
        var status = taskResp["status"].ToString();

        if (status == "ready")
        {
            Console.WriteLine("Successfully => " + responseString);
            return taskResp["solution"]["token"].ToString();
        }

        if (status == "failed")
        {
            Console.WriteLine("Failed! => " + responseString);
            return "";
        }
    }
}

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace HttpExample
{
    public class Program
    {
        private const string CAPSOLVER_API_KEY = "CAI-xxxxxxxxxxxxxxxxxxx";
        private const string PAGE_URL = "https://dash.cloudflare.com/login";
        private const string SITE_KEY = "0x4AAAAAAAJel0iaAR3mgkjp";

        public static async Task Main(string[] args)
        {
            var token = await CallCapsolver();
            Console.WriteLine($"token: {token}");
            await Login(token);
        }

        public static async Task<string> CallCapsolver()
        {
            // // Send GET request
            // var todoItem = await GetTodoItemAsync(API_URL);
            // Console.WriteLine("GET Request Result:");
            // Console.WriteLine(todoItem);

            var data = new
            {
                clientKey = CAPSOLVER_API_KEY,
                task = new
                {
                    type = "AntiTurnstileTaskProxyLess",
                    websiteURL = PAGE_URL,
                    websiteKey = SITE_KEY,
                    metadata = new { action = "login" }
                }
            };

            // Send POST request
            var response = await PostTodoItemAsync("https://api.capsolver.com/createTask", data);
            Console.WriteLine("POST Request Result:");
            var responseString = await response.Content.ReadAsStringAsync();
            Console.WriteLine(responseString);
            JObject taskResp = JsonConvert.DeserializeObject<JObject>(responseString);
            var taskId = taskResp["taskId"].ToString();
            if (string.IsNullOrEmpty(taskId))
            {
                Console.WriteLine("No task ID received.");
                return "";
            }
            Console.WriteLine($"Created task ID: {taskId}");

            while (true)
            {
                await Task.Delay(1000); // Sleep for 1 second
                var resultData = new
                {
                    clientKey = CAPSOLVER_API_KEY,
                    taskId = taskId
                };

                // content = new StringContent(JsonConvert.SerializeObject(data), System.Text.Encoding.UTF8, "application/json");
                // response = await httpClient.PostAsync(uri, content);

                response = await PostTodoItemAsync("https://api.capsolver.com/getTaskResult", resultData);
                responseString = await response.Content.ReadAsStringAsync();
                Console.WriteLine(responseString);
                if (!response.IsSuccessStatusCode)
                {
                    Console.WriteLine($"Failed to get task result: {responseString}");
                    return "";
                }

                taskResp = JsonConvert.DeserializeObject<JObject>(responseString);
                Console.WriteLine(taskResp);
                var status = taskResp["status"].ToString();

                if (status == "ready")
                {
                    Console.WriteLine("Successfully => " + responseString);
                    return taskResp["solution"]["token"].ToString();
                }

                if (status == "failed")
                {
                    Console.WriteLine("Failed! => " + responseString);
                    return "";
                }
            }
        }

        public static async Task Login(string token)
        {
            using var httpClient = new HttpClient();
            // Add request headers
            httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Cookie", $"cf_clearance={token}");
            httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Host", "dash.cloudflare.com");
            var data = new {
                cf_challenge_response = token,
                email = "1111111@gmail.com",
                password = "123456",
            };
            var json = JsonConvert.SerializeObject(data);
            var content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

            var response = await httpClient.PostAsync("https://dash.cloudflare.com/api/v4/login", content);

            if (!response.IsSuccessStatusCode)
            {
                throw new Exception($"Request failed with status code {response.StatusCode}");
            }

            var responseString = await response.Content.ReadAsStringAsync();
            Console.WriteLine(responseString);
        }

        private static async Task<HttpResponseMessage> GetTodoItemAsync(string url)
        {
            using var httpClient = new HttpClient();
            var response = await httpClient.GetAsync(url);

            if (!response.IsSuccessStatusCode)
            {
                throw new Exception($"Request failed with status code {response.StatusCode}");
            }

            // var responseString = await response.Content.ReadAsStringAsync();
            return response;
        }

        private static async Task<HttpResponseMessage> PostTodoItemAsync(string url, object item)
        {
            using var httpClient = new HttpClient();
            var json = JsonConvert.SerializeObject(item);
            var content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

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

            if (!response.IsSuccessStatusCode)
            {
                throw new Exception($"Request failed with status code {response.StatusCode}");
            }

            return response;
        }
    }
}