create a http server and parse cookies and return a json response in csharp

main.cs
using System;
using System.IO;
using System.Net;
using System.Text.Json;

class HttpServer {
    private HttpListener _listener;

    public HttpServer(int port) {
        _listener = new HttpListener();
        _listener.Prefixes.Add($"http://localhost:{port}/");
    }

    public async void Start() {
        _listener.Start();
        Console.WriteLine($"Server started at: {_listener.Prefixes}");

        while (true) {
            HttpListenerContext context = await _listener.GetContextAsync();
            HttpListenerRequest request = context.Request;
            HttpListenerResponse response = context.Response;

            // Parse cookies
            CookieCollection cookies = request.Cookies;

            // Create a JSON object
            var responseObject = new {
                message = "Hello, world!",
                cookies = cookies
            };

            // Serialize the object to JSON
            string json = JsonSerializer.Serialize(responseObject);

            // Set response headers
            response.ContentType = "application/json";
            response.ContentEncoding = System.Text.Encoding.UTF8;
            
            // Write the JSON data to the response
            byte[] buffer = System.Text.Encoding.UTF8.GetBytes(json);
            response.ContentLength64 = buffer.Length;
            Stream output = response.OutputStream;
            output.Write(buffer, 0, buffer.Length);
            output.Close();
        }
    }
}

class Program {
    static void Main(string[] args) {
        HttpServer server = new HttpServer(8080);
        server.Start();
        Console.ReadKey();
    }
}
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