Https freezes the game for one second

When I make a request to the server, all the game freezes for a few seconds, I think that the game is waiting for a server response, there is a way to not wait for the server's response?

This is my code

 using UnityEngine;
 using System.IO;
 using System.Net;
 using System.Text;
 using System.Net.Security;
 using System.Security.Cryptography.X509Certificates;
 
 public class Request : MonoBehaviour
 {
     public void RequestFunction()
     {
         string output = RequestServer("page");
         Debug.Log(output);
     }
 
     public string RequestServer(string page) 
     {
         string output = "";
         try
         {
             ServicePointManager.ServerCertificateValidationCallback = Validator;
             string data;
             // Create a request using a URL that can receive a post. 
             WebRequest request = WebRequest.Create("https://www.mys_ite_web/" + page);
             // If required by the server, set the credentials.
             request.Credentials = CredentialCache.DefaultCredentials;
             // Set the Method property of the request to POST.
             request.Method = "POST";
             // Create POST data and convert it to a byte array.
             string postData = "data=";
             byte[] byteArray = Encoding.UTF8.GetBytes(postData);
             // Set the ContentType property of the WebRequest.
             request.ContentType = "application/x-www-form-urlencoded";
             // Set the ContentLength property of the WebRequest.
             request.ContentLength = byteArray.Length;
             // Get the request stream.
             Stream dataStream = request.GetRequestStream ();
             // Write the data to the request stream.
             dataStream.Write (byteArray, 0, byteArray.Length);
             dataStream.Close();
 
             // Get the response.
             WebResponse response = request.GetResponse();
             // Display the status.
             //Console.WriteLine(((HttpWebResponse)response).StatusDescription);
             // Get the stream containing content returned by the server.
             dataStream = response.GetResponseStream();
             // Open the stream using a StreamReader for easy access.
             StreamReader reader = new StreamReader(dataStream);
             // Read the content.
             string responseFromServer = reader.ReadToEnd();
             // Display the content.
             //Console.WriteLine(responseFromServer);
             data=responseFromServer;
             // Clean up the streams.
             reader.Close();
             dataStream.Close();
             response.Close();
             output = data;
         }
         catch(System.Exception e)
         {
             Debug.Log(e);
         }
         return output;
     }
 
     public static bool Validator (object sender, X509Certificate certificate, X509Chain chain,
         SslPolicyErrors sslPolicyErrors)
     {
         return true;
     }
 }