In my URL, when using http, its working. When using https, its not working. Why? code attached below

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.Networking; using System.Security.Cryptography.X509Certificates; using System;

public class Calculation : MonoBehaviour {

 string jsonResult;
 Helper.displayBoard[] displayInfo;
 public Text E20, E40, E45;
 public Text F20, F40, F45;
 public Text T20, T40, T45;
 

 // Use this for initialization
 void Start()
 {
     E20 = GameObject.Find("E20").GetComponentInChildren<Text>();
     E40 = GameObject.Find("E40").GetComponentInChildren<Text>();
     E45 = GameObject.Find("E45").GetComponentInChildren<Text>();
     F20 = GameObject.Find("F20").GetComponentInChildren<Text>();
     F40 = GameObject.Find("F40").GetComponentInChildren<Text>();
     F45 = GameObject.Find("F45").GetComponentInChildren<Text>();
     T20 = GameObject.Find("T20").GetComponentInChildren<Text>();
     T40 = GameObject.Find("T40").GetComponentInChildren<Text>();
     T45 = GameObject.Find("T45").GetComponentInChildren<Text>();
 
     StartCoroutine(LoadData());
     //displydata();
 }

 // Update is called once per frame
 void Update()
 {

 }

IEnumerator LoadData() { / string contUrl = "http://961.8.144.142:9080/conslot/getContainerStatistics3d";/ string contUrl = "https://961.8.144.142:9080/conslot/getContainerStatistics3d";

     using (UnityWebRequest www = UnityWebRequest.Get(contUrl))
     {
         yield return www.Send();
         if (www.isNetworkError || www.isHttpError)
         {
             Debug.Log(www.error);
         }
         else
         {
             jsonResult = System.Text.Encoding.UTF8.GetString(www.downloadHandler.data);
             // Debug.Log(jsonResult);
             jsonResult = jsonResult.Split(new string[] { "[" }, System.StringSplitOptions.None)[1];
             jsonResult = jsonResult.Split(new string[] { "]" }, System.StringSplitOptions.None)[0];
             displayInfo = Helper.JsonHelper.getJsonArray<Helper.displayBoard>(jsonResult);
             foreach (Helper.displayBoard displayInf in displayInfo)
             {
                 E20.text = displayInf.e20;
                 F20.text = displayInf.f20;
                 E40.text = displayInf.e40;
                 F40.text = displayInf.f40;
                 E45.text = displayInf.e45;
                 F45.text = displayInf.f45;

                 T20.text = (int.Parse(displayInf.e20) + int.Parse(displayInf.f20)).ToString();
                 T40.text = (int.Parse(displayInf.e40) + int.Parse(displayInf.f40)).ToString();
                 T45.text = (int.Parse(displayInf.e45) + int.Parse(displayInf.f45)).ToString();
             }
         }
     }
 }

}