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;
	}
}

Yes, just use Ienumerator.