I am trying to wirite a custom session provider in .net framework 4.8. What I do not understand, and my problem is that when I try to access data like
Session[key] I imagine that the session provider GetItem should got called, but that’s not happening.

Here is my session provider prototype where I was trying to do this:

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading;
using System.Web;
using System.Web.SessionState;

namespace MVC
{
    public class PPMSesseionStateProvider : SessionStateStoreProviderBase
    {
        private string baseURl = string.Empty;

        public override void Initialize(string name, NameValueCollection config)
        {
            if (String.IsNullOrEmpty(config["description"]))
            {
                config.Remove("description");
                config.Add("description", "Custom PPM Session State Store provider");
            }

            baseURl = ConfigurationManager.AppSettings["baseURL"];

            base.Initialize(name, config);
        }

        public override SessionStateStoreData CreateNewStoreData(HttpContext context, int timeout)
        {
            return new SessionStateStoreData(new SessionStateItemCollection(), SessionStateUtility.GetSessionStaticObjects(context), timeout);
        }

        public override void CreateUninitializedItem(HttpContext context, string id, int timeout)
        {}

        public override void Dispose()
        {}

        public override void EndRequest(HttpContext context)
        {}

        public override SessionStateStoreData GetItem(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions)
        {
            //SAME AS GETITEM
            var request = WebRequest.Create($"https://localhost:5000/SessionTest/get/asdfrgfds");
            request.ContentType = "application/json; charset=utf-8";
            request.Method = "GET";
            request.Headers.Add("PPMSessionHeader", "12345");
            var sessionResponse = (HttpWebResponse)request.GetResponse();


            // Initial values for return value and out parameters.
            SessionStateStoreData item = null;
            lockAge = TimeSpan.Zero;
            lockId = null;
            locked = false;
            actions = 0;

            var response = string.Empty; //get the reposnse form the server (look for the object type in the server) and create

            SessionStateItemCollection sessionItems = new SessionStateItemCollection();

            if (sessionResponse.ContentLength > 0)
            {
                var reader = new BinaryReader(sessionResponse.GetResponseStream());
                sessionItems = SessionStateItemCollection.Deserialize(reader);
            }

            return new SessionStateStoreData(sessionItems, SessionStateUtility.GetSessionStaticObjects(context), 1000);
        }

        public override SessionStateStoreData GetItemExclusive(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions)
        {
            //SAME AS GETITEM
            var request = WebRequest.Create($"https://localhost:5000/SessionTest/get/asdfrgfds");
            request.ContentType = "application/json; charset=utf-8";
            request.Method = "GET";
            request.Headers.Add("PPMSessionHeader", "12345");
            var sessionResponse = (HttpWebResponse)request.GetResponse();


            // Initial values for return value and out parameters.
            SessionStateStoreData item = null;
            lockAge = TimeSpan.Zero;
            lockId = null;
            locked = false;
            actions = 0;

            var response = string.Empty; //get the reposnse form the server (look for the object type in the server) and create

            SessionStateItemCollection sessionItems = new SessionStateItemCollection();

            if (sessionResponse.ContentLength > 0)
            {
                var reader = new BinaryReader(sessionResponse.GetResponseStream());
                sessionItems = SessionStateItemCollection.Deserialize(reader);
            }

            return new SessionStateStoreData(sessionItems, SessionStateUtility.GetSessionStaticObjects(context), 1000);
        }

        public override void InitializeRequest(HttpContext context)
        {}

        public override void ReleaseItemExclusive(HttpContext context, string id, object lockId)
        {}

        public override void RemoveItem(HttpContext context, string id, object lockId, SessionStateStoreData item)
        {
           //send request to remove item from session
        }

        public override void ResetItemTimeout(HttpContext context, string id)
        {}

        public override void SetAndReleaseItemExclusive(HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem)
        {
            //send the key and the value to the API
        }

        public override bool SetItemExpireCallback(SessionStateItemExpireCallback expireCallback) => false;
    }
}

The controller action where I test this:

public ActionResult Index()
{
    string key = "ProductID:1001";
    var customObject = Session[key]; // at this line nothing is triggered !!!
    Session.Add(key, "tralalalala");


    return View();
}

thnx