C# Figma communication

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace YourWpfApp
{
    public partial class MainWindow : Window
    {
        private HttpListener _listener;

        public MainWindow()
        {
            InitializeComponent();
            StartHttpListener();
        }

        private async void StartHttpListener()
        {
            _listener = new HttpListener();
            _listener.Prefixes.Add("http://your-ip-address:5000/");  //If I use my machines IP address, how figma plugin access it? 
            _listener.Start();
            Console.WriteLine("Listening...");

            while (true)
            {
                var context = await _listener.GetContextAsync();
                ProcessRequest(context);
            }
        }

        private void ProcessRequest(HttpListenerContext context)
        {
            string responseString = "{"message": "Hello from WPF Server!"}";
            context.Response.StatusCode = (int)HttpStatusCode.OK;
            context.Response.ContentType = "application/json";

            // Read incoming data
            using (var reader = new StreamReader(context.Request.InputStream, context.Request.ContentEncoding))
            {
                string requestData = reader.ReadToEnd();
                Console.WriteLine("Received data: " + requestData);
            }

            // Send response back
            byte[] buffer = Encoding.UTF8.GetBytes(responseString);
            context.Response.ContentLength64 = buffer.Length;

            using (var output = context.Response.OutputStream)
            {
                output.Write(buffer, 0, buffer.Length);
            }

            context.Response.Close();
        }

        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            _listener.Stop();
            _listener.Close();
        }
    }
}

my sample c# code

My sample Figma plugin code

async function sendDataToCSharp(data) {
   try {
       const response = await fetch('http://192.168.1.100:5000/', { // Use the internal IP
           method: 'POST',
           headers: {
               'Content-Type': 'application/json',
           },
           body: JSON.stringify(data),
       });
       const responseData = await response.json();
       console.log(responseData);
   } catch (error) {
       console.error('Error:', error);
   }
}

But how Figma plugin access my machine? I am using my machine in my company’s network as well.