diff --git a/Projects/DLL/SystemX.Core.dll b/Projects/DLL/SystemX.Core.dll
index 7161570..769ebfc 100644
Binary files a/Projects/DLL/SystemX.Core.dll and b/Projects/DLL/SystemX.Core.dll differ
diff --git a/Projects/SystemX.Core/SystemX.Core/Communication/Http.cs b/Projects/SystemX.Core/SystemX.Core/Communication/Http.cs
index 2657017..230f721 100644
--- a/Projects/SystemX.Core/SystemX.Core/Communication/Http.cs
+++ b/Projects/SystemX.Core/SystemX.Core/Communication/Http.cs
@@ -1,4 +1,5 @@
-using System;
+using Newtonsoft.Json.Linq;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net.Http.Json;
@@ -14,7 +15,7 @@ namespace SystemX.Core.Communication
         /// </summary>        
         /// <param name="url">https://127.0.0.1:443</param>       
         /// <param name="timeOutSeconds">Range 5~30 secconds</param>       
-        public virtual async Task<RESPONSE?> PostJsonAsync<REQUEST, RESPONSE>(string url, REQUEST request, short timeOutSeconds = 5) where REQUEST : class where RESPONSE : class
+        public virtual async Task<RESPONSE?> PostJsonAsync<REQUEST, RESPONSE>(string url, REQUEST request, string bearerToken = "", short timeOutSeconds = 5) where REQUEST : class where RESPONSE : class
         {
             RESPONSE? response = default(RESPONSE);
             Guid guid = Guid.NewGuid();
@@ -25,6 +26,9 @@ namespace SystemX.Core.Communication
                 httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
                 httpClient.BaseAddress = new Uri($"{url}");
 
+                if(string.IsNullOrEmpty(bearerToken) == false)
+                    httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", $"{bearerToken}");
+
                 int retry = 0;
                 while (true)
                 {
@@ -59,7 +63,7 @@ namespace SystemX.Core.Communication
         /// </summary>    
         /// <param name="url">https://127.0.0.1:443</param>       
         /// <param name="timeOutSeconds">Range 5~30 secconds</param>
-        public virtual async Task<RESPONSE?> GetJsonAsync<RESPONSE>(string url, short timeOutSeconds = 10) where RESPONSE : class
+        public virtual async Task<RESPONSE?> GetJsonAsync<RESPONSE>(string url, string bearerToken = "", short timeOutSeconds = 10) where RESPONSE : class
         {
             RESPONSE? response = default(RESPONSE);
             Guid guid = Guid.NewGuid();
@@ -72,6 +76,9 @@ namespace SystemX.Core.Communication
                     httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
                     httpClient.BaseAddress = new Uri($"{url}");
 
+                    if (string.IsNullOrEmpty(bearerToken) == false)
+                        httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", $"{bearerToken}");
+
                     Log4net.WriteLine($"[GET] Request({guid})::{url}", LogType.HTTP);
 
                     DateTime requestTime = DateTime.Now;
@@ -88,6 +95,7 @@ namespace SystemX.Core.Communication
             return response;
         }
 
+
         protected HttpClientHandler GetClientHandler()
         {
             HttpClientHandler clientHandler = new HttpClientHandler();
diff --git a/Projects/SystemX.Core/SystemX.Core/DB/DBTransaction.cs b/Projects/SystemX.Core/SystemX.Core/DB/DBTransaction.cs
index d2c32a6..b1ee905 100644
--- a/Projects/SystemX.Core/SystemX.Core/DB/DBTransaction.cs
+++ b/Projects/SystemX.Core/SystemX.Core/DB/DBTransaction.cs
@@ -12,14 +12,6 @@ namespace SystemX.Core.DB
 {
     public static class DBTransaction
     {
-        /// <summary>
-        /// Get SqlServer Connection String
-        /// </summary>   
-        public static string ConvertToConnectionString(this DataBase dbConfig)
-        {
-            return $"server={dbConfig.IP},{dbConfig.Port}; user id={dbConfig.UserID}; password={dbConfig.Password}; database={dbConfig.DBName}; TrustServerCertificate=true;";
-        }
-
         public static IEnumerable<TEntity>? GetEntity<TEntity>(this DbContext dbContext) where TEntity : class
         {
             IEnumerable<TEntity>? entity = default;
diff --git a/Projects/SystemX.Core/SystemX.Core/SystemX.Core.csproj b/Projects/SystemX.Core/SystemX.Core/SystemX.Core.csproj
index 78d6509..17016a0 100644
--- a/Projects/SystemX.Core/SystemX.Core/SystemX.Core.csproj
+++ b/Projects/SystemX.Core/SystemX.Core/SystemX.Core.csproj
@@ -16,6 +16,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="CsvHelper" Version="33.0.1" />
     <PackageReference Include="log4net" Version="3.0.4" />
     <PackageReference Include="Microsoft.Data.SqlClient" Version="6.0.1" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.15" />
diff --git a/Projects/SystemX.Core/SystemX.Core/Utils/CsvUtils.cs b/Projects/SystemX.Core/SystemX.Core/Utils/CsvUtils.cs
new file mode 100644
index 0000000..48e3482
--- /dev/null
+++ b/Projects/SystemX.Core/SystemX.Core/Utils/CsvUtils.cs
@@ -0,0 +1,28 @@
+using CsvHelper.Configuration;
+using CsvHelper;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+public static class CsvUtils
+{
+    public static async Task<byte[]> ExportToCsvByteArray<T>(this IEnumerable<T> data) where T : class
+    {
+        using var memoryStream = new MemoryStream();
+        using var streamWriter = new StreamWriter(memoryStream, Encoding.UTF8);
+        using var csvWriter = new CsvWriter(streamWriter, new CsvConfiguration(CultureInfo.InvariantCulture));
+
+        await csvWriter.WriteRecordsAsync(data);
+        await streamWriter.FlushAsync();
+
+        memoryStream.Position = 0;
+                      
+        return memoryStream.ToArray();
+    }
+}
+
diff --git a/Projects/SystemX.Core/SystemX.Core/Utils/DBUtils.cs b/Projects/SystemX.Core/SystemX.Core/Utils/DBUtils.cs
new file mode 100644
index 0000000..eecdfe7
--- /dev/null
+++ b/Projects/SystemX.Core/SystemX.Core/Utils/DBUtils.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SystemX.Core.Config.Model;
+
+public static class DBUtils
+{
+    /// <summary>
+    /// Get SqlServer Connection String
+    /// </summary>   
+    public static string ConvertToConnectionString(this DataBase dbConfig)
+    {
+        return $"server={dbConfig.IP},{dbConfig.Port}; user id={dbConfig.UserID}; password={dbConfig.Password}; database={dbConfig.DBName};";
+    }
+}
+
diff --git a/Projects/VPKI/VPKI/VPKI.Library/Services/HttpService.cs b/Projects/VPKI/VPKI/VPKI.Library/Services/HttpService.cs
deleted file mode 100644
index 1b10694..0000000
--- a/Projects/VPKI/VPKI/VPKI.Library/Services/HttpService.cs
+++ /dev/null
@@ -1,112 +0,0 @@
-using System.Net.Http.Json;
-
-namespace VPKI.Library.Services
-{
-    public class HttpService : CommonService
-    {
-        public HttpService()
-            : base()
-        {
-        }
-
-        /// <summary>
-        /// PostJsonAsync
-        /// </summary>        
-        /// <param name="url">https://127.0.0.1:443</param>       
-        /// <param name="timeOutSeconds">Range 5~30 secconds</param>       
-        public virtual async Task<RESPONSE?> PostJsonAsync<REQUEST, RESPONSE>(string url, REQUEST request, short timeOutSeconds = 5) where REQUEST : class where RESPONSE : class
-        {
-            RESPONSE? response = default(RESPONSE);
-            Guid guid = Guid.NewGuid();
-            
-            using (HttpClient httpClient = new HttpClient(GetClientHandler()))
-            {
-                int retry = 0;
-                while (true)
-                {
-                    await Task.Delay(1);
-                    try
-                    {                        
-                        var timeOutSec = SetTimeout(timeOutSeconds);
-                        httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
-                        httpClient.BaseAddress = new Uri($"{url}");
-
-                        Log4net.WriteLine($"[POST] Request({guid})::{url}{Environment.NewLine}{request?.ToJson()}", LogType.HTTP);
-
-                        DateTime requestTime = DateTime.Now;
-                        var res = await httpClient.PostAsJsonAsync(url, request);                    
-                        response = await res.Content.ReadFromJsonAsync<RESPONSE>();
-
-                        Log4net.WriteLine($"[POST] Rseponse({guid}) ({(DateTime.Now - requestTime).TotalSeconds} sec)::{url}{Environment.NewLine}{response?.ToJson()}", LogType.HTTP);
-                        break;
-                    }
-                    catch (Exception e)
-                    {
-                        Log4net.WriteLine(e);
-                        retry += 1;
-                    }
-
-                    if (retry > 1)
-                        break;
-                }
-            }
-
-            return response;
-        }
-
-        /// <summary>
-        /// GetJsonAsnyc
-        /// </summary>    
-        /// <param name="url">https://127.0.0.1:443</param>       
-        /// <param name="timeOutSeconds">Range 5~30 secconds</param>
-        public virtual async Task<RESPONSE?> GetJsonAsync<RESPONSE>(string url, short timeOutSeconds = 10) where RESPONSE : class
-        {
-            RESPONSE? response = default(RESPONSE);
-            Guid guid = Guid.NewGuid();
-
-            using (HttpClient httpClient = new HttpClient(GetClientHandler()))
-            {
-                try
-                {                   
-                    var timeOutSec = SetTimeout(timeOutSeconds);
-                    httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
-                    httpClient.BaseAddress = new Uri($"{url}");
-
-                    Log4net.WriteLine($"[GET] Request({guid})::{url}", LogType.HTTP);
-
-                    DateTime requestTime = DateTime.Now;
-                    response = await httpClient.GetFromJsonAsync<RESPONSE>(url);
-
-                    Log4net.WriteLine($"[GET] Rseponse({guid}) ({(DateTime.Now - requestTime).TotalSeconds} sec)::{url}", LogType.HTTP);                   
-                }
-                catch (Exception e)
-                {
-                    Log4net.WriteLine(e);
-                }
-            }
-
-            return response;
-        }
-
-        protected HttpClientHandler GetClientHandler()
-        {
-            HttpClientHandler clientHandler = new HttpClientHandler();
-            clientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, sslPolicyErrors) =>
-            {
-                return true;
-            };
-
-            return clientHandler;
-        }
-
-        protected short SetTimeout(short timeOutSeconds)
-        {
-            short timeoutMin = 5;
-            short timeoutMax = 30;
-
-            timeOutSeconds = Math.Clamp(timeOutSeconds, timeoutMin, timeoutMax);           
-
-            return timeOutSeconds;
-        }
-    }
-}
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_02Service.cs b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_02Service.cs
index 7b2a14f..7f5f547 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_02Service.cs
+++ b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_02Service.cs
@@ -7,6 +7,7 @@ using Org.BouncyCastle.Asn1.X9;
 using Org.BouncyCastle.Pkcs;
 using System.Security.Cryptography;
 using System.Text;
+using SystemX.Core.Communication;
 using SystemX.Core.DB;
 using VPKI.Library.Config;
 using VPKI.Library.Enums;
@@ -210,7 +211,8 @@ namespace VPKI.Web.Api.Services
                         string url = $"{URL_VPKI_BASE}{URL_V1_CERTIFICATE_ISSUE}";
                         url = url.Replace("{1}", "prov");
 
-                        responseOem = await PostJsonAsync<Request_CertificateOEM, Response_CertificateOEM>($"{url}", requestOem);
+                        var http = new Http();
+                        responseOem = await http.PostJsonAsync<Request_CertificateOEM, Response_CertificateOEM>($"{url}", requestOem);
 
                         response.status = responseOem?.status;
                         response.message = $"{responseOem?.resultMessage}";
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_20Service.cs b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_20Service.cs
index fb780b1..6348886 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_20Service.cs
+++ b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/ISO15118_20Service.cs
@@ -12,6 +12,7 @@ using Org.BouncyCastle.Asn1.X9;
 using DB.VPKI_DataDB;
 using Microsoft.EntityFrameworkCore;
 using SystemX.Core.DB;
+using SystemX.Core.Communication;
 
 namespace VPKI.Web.Api.Services
 {
@@ -221,7 +222,8 @@ namespace VPKI.Web.Api.Services
                         string url = $"{URL_VPKI_BASE}{URL_V2_CERTIFICATE_ISSUE}";
                         url = url.Replace("{1}", $"{vpkiType.ToString().Split("_").FirstOrDefault()}");
 
-                        responseOem = await PostJsonAsync<Request_CertificateOEM, Response_CertificateOEM>(url, requestOem);
+                        var http = new Http();
+                        responseOem = await http.PostJsonAsync<Request_CertificateOEM, Response_CertificateOEM>(url, requestOem);
 
                         response.status = responseOem?.status;
                         response.message = $"{responseOem?.resultMessage}";
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/VpkiBaseService.cs b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/VpkiBaseService.cs
index 43a10b5..2bcc700 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Api/Services/VpkiBaseService.cs
+++ b/Projects/VPKI/VPKI/VPKI.Web.Api/Services/VpkiBaseService.cs
@@ -23,7 +23,7 @@ using VPKI.Library.Services;
 
 namespace VPKI.Web.Api.Services
 {
-    public class VpkiBaseService : HttpService
+    public class VpkiBaseService
     {
         private readonly IServiceScopeFactory _scopeFactory;
 
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Layout/HeaderBar.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Layout/HeaderBar.razor
index f128aca..76336e2 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Layout/HeaderBar.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Layout/HeaderBar.razor
@@ -1,4 +1,5 @@
 @using System.Security.Claims
+@using SystemX.Core.Communication
 @using VPKI.Library.Model.Auth
 
 @inject NavigationManager NavigationManager
@@ -73,7 +74,11 @@
         };
 
         await((ExtendAuthenticationStatProvicer)AuthStateProvider).MakeUserLogout();
-        var res = await ApiService.PostJsonAsyncBearer<LogoutModel, LogoutResponseModel>("/api/auth/logout", logoutModel);
+
+        var token = await ApiService.GetSessionState();
+
+        var http = new Http();
+        var res = await http.PostJsonAsync<LogoutModel, LogoutResponseModel>("https://127.0.0.1:8080/api/auth/logout", logoutModel, $"{token}");
         NavigationManager.NavigateTo("/login");
     }
 
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiCertificate.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiCertificate.razor
index 633f4b9..4b0f43b 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiCertificate.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiCertificate.razor
@@ -5,6 +5,7 @@
 @using Org.BouncyCastle.Crypto.Parameters
 @using Org.BouncyCastle.OpenSsl
 @using Org.BouncyCastle.Security
+@using SystemX.Core.Communication
 @using VPKI.Library.Packet
 
 @inject CertificateService CertificateService
@@ -190,7 +191,8 @@
                     url = $"api/v2/vehicle/certificate";
                 }
 
-                var Response = await ApiService.PostJsonAsync<Request_Certificate, Response_Certificate>($"https://{ServerAddress}/{url}", request);
+                var http = new Http();
+                var Response = await http.PostJsonAsync<Request_Certificate, Response_Certificate>($"https://{ServerAddress}/{url}", request);
                 if (Response != null)
                 {
                     CertificateContainer.ResponseCertificate = Response;
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiTbscsr.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiTbscsr.razor
index 0eacbca..e332d97 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiTbscsr.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiTbscsr.razor
@@ -1,5 +1,6 @@
 @using Org.BouncyCastle.Crypto
 @using Org.BouncyCastle.Crypto.Parameters
+@using SystemX.Core.Communication
 @using VPKI.Library.Packet
 
 @inject CertificateService CertificateService
@@ -194,7 +195,8 @@
                     url = $"api/v2/vehicle/tbscsr";
                 }
 
-                var Response = await ApiService.PostJsonAsync<Request_Tbscsr, Response_Tbscsr>($"https://{ServerAddress}/{url}", request);
+                var http = new Http();
+                var Response = await http.PostJsonAsync<Request_Tbscsr, Response_Tbscsr>($"https://{ServerAddress}/{url}", request);
                 if (Response != null)
                 {
                     TbscsrContainer.ResponseTbscsr = Response;
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiVerifyResult.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiVerifyResult.razor
index 6a1c112..819bec8 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiVerifyResult.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Module/VPKIApiVerifyResult.razor
@@ -1,4 +1,5 @@
-@using VPKI.Library.Packet
+@using SystemX.Core.Communication
+@using VPKI.Library.Packet
 
 @inject CertificateService CertificateService
 @inject ApiService ApiService
@@ -89,7 +90,8 @@
                     url = $"api/v2/vehicle/verifyresult";
                 }
 
-                var Response = await ApiService.PostJsonAsync<Request_Verifyresult, Response_Verifyresult>($"https://{ServerAddress}/{url}", request);
+                var http = new Http();
+                var Response = await http.PostJsonAsync<Request_Verifyresult, Response_Verifyresult>($"https://{ServerAddress}/{url}", request);
                 if (Response != null)
                 {
                     VerifyResultContainer.ResponseVerifyresult = Response;
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Login.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Login.razor
index cbef224..435d64a 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Login.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Login.razor
@@ -1,4 +1,5 @@
 @page "/login"
+@using SystemX.Core.Communication
 
 @inject NavigationManager NavigationManager
 @inject ApiService ApiService
@@ -49,7 +50,10 @@
         LoginModel.Password = $"{LoginModel.Password?.StringToSHA256Base64()}";
         ErrorCode = string.Empty;
 
-        var res = await ApiService.PostJsonAsyncBearer<LoginModel, LoginResponseModel>($"/api/auth/login", LoginModel);
+        var token = await ApiService.GetSessionState();
+
+        var http = new Http();
+        var res = await http.PostJsonAsync<LoginModel, LoginResponseModel>($"https://127.0.0.1:8080/api/auth/login", LoginModel, $"{token}");
         if (res?.AccessToken != null)
         {
             await ((ExtendAuthenticationStatProvicer)AuthStateProvider).MakeUserAsAuthenticated(res);
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Register.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Register.razor
index 5140424..04fe486 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Register.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/Register.razor
@@ -1,4 +1,5 @@
 @page "/register"
+@using SystemX.Core.Communication
 
 @inject NavigationManager NavigationManager
 @inject ApiService ApiService
@@ -67,7 +68,11 @@
         //password hash
         RegisterModel.Password = $"{RegisterModel.Password?.StringToSHA256Base64()}";
         RegisterModel.PasswordConfirm = $"{RegisterModel.PasswordConfirm?.StringToSHA256Base64()}";
-        var res = await ApiService.PostJsonAsyncBearer<RegisterModel, RegisterResponseModel>($"/api/auth/regisger", RegisterModel);
+
+        var token = await ApiService.GetSessionState();
+
+        var http = new Http();
+        var res = await http.PostJsonAsync<RegisterModel, RegisterResponseModel>($"https://127.0.0.1:8080/api/auth/regisger", RegisterModel, $"{token}");
         if (res != null)
         {
             if (res.EC == ERROR_CODE.EC_OK)
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/User.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/User.razor
index 44a1ebf..f2acb0b 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/User.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/User.razor
@@ -1,4 +1,5 @@
 @page "/user"
+@using SystemX.Core.Communication
 
 @inject ApiService ApiService
 @inject VpkiDialogService DialogService
@@ -95,7 +96,11 @@
         if(confirm == true)
         {
             user.TRole.CRoleName = $"{Enum.GetName(typeof(UserRole), user.TRole.CRoleId)}";
-            var retunUser = await ApiService.PostJsonAsyncBearer<UserModel, UserModel>("/api/user/UpdateUser", user);
+
+            var token = await ApiService.GetSessionState();
+            var http = new Http();
+
+            var retunUser = await http.PostJsonAsync<UserModel, UserModel>("https://127.0.0.1:8080/api/user/UpdateUser", user, $"{token}");
             if (retunUser != null)
             {
                 await GetAllUsers();
@@ -114,7 +119,10 @@
 
     private async Task GetAllUsers()
     {
-        var response = await ApiService.GetJsonAsyncBearer<List<UserModel>>("/api/user/GetAllUser");
+        var http = new Http();
+
+        var token = await ApiService.GetSessionState();
+        var response = await http.GetJsonAsync<List<UserModel>>("https://127.0.0.1:8080/api/user/GetAllUser", $"{token}");
         if (response != null)
         {
             data = response.OrderBy(x=>x.TUser.CCreateDateTime).ToList();
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/VPKIManager.razor b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/VPKIManager.razor
index af488ca..bbc595d 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/VPKIManager.razor
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Components/Pages/VPKIManager.razor
@@ -1,6 +1,7 @@
 @page "/vpki/manager"
 @using DB.VPKI_DataDB
 @using System.Text
+@using SystemX.Core.Communication
 @using VPKI.Library.Packet
 @using VPKI.Library.Static
 
@@ -199,7 +200,7 @@
         //Default filter
         requestUrl += $"startDate={SearchStartDate}&";
         requestUrl += $"endDate={SearchEndDate}&";
-       // requestUrl += $"startCcuid={startCcuid}&";
+        // requestUrl += $"startCcuid={startCcuid}&";
 
         //optional filter
         // if (string.IsNullOrEmpty(FilterIft) == false)
@@ -220,7 +221,8 @@
         // }      
 
         history?.Clear();
-        var result = await ApiService.GetJsonAsync<List<CertificateHistoryModel>>(requestUrl);
+        var http = new Http();
+        var result = await http.GetJsonAsync<List<CertificateHistoryModel>>(requestUrl);
         if (result != null)
         {           
             history.AddRange(result);
@@ -264,11 +266,12 @@
             api = "api/v2/vehicle/reissue";
         }
 
-        var result = await ApiService.PostJsonAsync<Request_Certificate, Response_Certificate>($"https://{ServerAddress}/{api}", requestReissue);
+        var http = new Http();
+        var result = await http.PostJsonAsync<Request_Certificate, Response_Certificate>($"https://{ServerAddress}/{api}", requestReissue);
         if (result != null)
         {
             string requestUrl = $"https://{ServerAddress}/history/ccuid?ccuid={args.TTbscsr.CCuid}";
-            var updateResult = await ApiService.GetJsonAsync<CertificateHistoryModel>(requestUrl);
+            var updateResult = await http.GetJsonAsync<CertificateHistoryModel>(requestUrl);
             if (updateResult != null)
             {
                 args.TTbscsr = updateResult.TTbscsr;
@@ -316,11 +319,12 @@
             api = "api/v2/vehicle/revoke";
         }
 
-        var result = await ApiService.PostJsonAsync<Request_CertificateRevokeOEM, Response_CertificateRevokeOEM>($"https://{ServerAddress}/{api}", requestRevoke);
+        var http = new Http();
+        var result = await http.PostJsonAsync<Request_CertificateRevokeOEM, Response_CertificateRevokeOEM>($"https://{ServerAddress}/{api}", requestRevoke);
         if (result != null)
         {
             string requestUrl = $"https://{ServerAddress}/history/ccuid?ccuid={args.TTbscsr.CCuid}";
-            var updateResult = await ApiService.GetJsonAsync<CertificateHistoryModel>(requestUrl);
+            var updateResult = await http.GetJsonAsync<CertificateHistoryModel>(requestUrl);
             if (updateResult != null)
             {
                 args.TTbscsr = updateResult.TTbscsr;
@@ -425,9 +429,11 @@
         DialogService.OpenIndicator("Export to Prov Certificate");
 
         if (certificate != null)
-        {            
+        {
+            var http = new Http();
+
             string requestUrl = $"https://{ServerAddress}/certificate/GetProv?vpkiType={certificate.TTbscsr.CCertType}";
-            var response = await ApiService.GetJsonAsync<string>(requestUrl);
+            var response = await http.GetJsonAsync<string>(requestUrl);
 
             string fileName = $"SubCA.pem";
             bool exportResult = await JS.InvokeAsync<bool>("openSaveFileStr", fileName, response);
diff --git a/Projects/VPKI/VPKI/VPKI.Web.Client/Services/ApiService.cs b/Projects/VPKI/VPKI/VPKI.Web.Client/Services/ApiService.cs
index 49eb636..93d4aee 100644
--- a/Projects/VPKI/VPKI/VPKI.Web.Client/Services/ApiService.cs
+++ b/Projects/VPKI/VPKI/VPKI.Web.Client/Services/ApiService.cs
@@ -8,7 +8,7 @@ using VPKI.Library.Services;
 
 namespace VPKI.Web.Client.Services
 {
-    public class ApiService : HttpService
+    public class ApiService
     {       
         private readonly ProtectedLocalStorage _localStorage;
         private readonly ConfigService<WebClientConfig> _configService;
@@ -23,76 +23,12 @@ namespace VPKI.Web.Client.Services
             _configService = configService;
         }
 
-        public async Task<RESPONSE?> PostJsonAsyncBearer<REQUEST, RESPONSE>(string url, REQUEST request, short timeOutSeconds = 5) where REQUEST : class where RESPONSE : class
+        public async Task<string?> GetSessionState()
         {
-            RESPONSE? response = default(RESPONSE);
-            Guid guid = Guid.NewGuid();
+            var sessionModel = (await _localStorage.GetAsync<LoginResponseModel>(SESSION_STATE)).Value;
+            var token = sessionModel?.AccessToken;
 
-            var apiConfig = _configService?.GetConfig()?.Api?.Find(x => x.ApiName?.ToLower() == Consts.VPKI_API.ToLower());
-            string apiUrl = $"{apiConfig.Address}:{apiConfig.Port}";
-
-            using (HttpClient httpClient = new HttpClient(GetClientHandler()))
-            {
-                try
-                {
-                    //bearer token set
-                    var sessionModel = (await _localStorage.GetAsync<LoginResponseModel>(SESSION_STATE)).Value;
-                    var token = sessionModel?.AccessToken;
-                    httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", $"{token}");
-                                        
-                    var timeOutSec = SetTimeout(timeOutSeconds);
-                    httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
-                    httpClient.BaseAddress = new Uri($"{apiUrl}{url}");
-
-                    Log4net.WriteLine($"[POST] Request({guid})::{url}{Environment.NewLine}{request?.ToJson()}", LogType.HTTP);
-
-                    var res = await httpClient.PostAsJsonAsync(url, request);
-                    response = await res.Content.ReadFromJsonAsync<RESPONSE>();
-
-                    Log4net.WriteLine($"[POST] Rseponse({guid})::{url}{Environment.NewLine}{response?.ToJson()}", LogType.HTTP);
-                }
-                catch (Exception e)
-                {
-                    Log4net.WriteLine(e);
-                }
-            }
-            return response;
-        }
-
-        public async Task<RESPONSE?> GetJsonAsyncBearer<RESPONSE>(string url, short timeOutSeconds = 5) where RESPONSE : class
-        {
-            RESPONSE? response = default(RESPONSE);
-            Guid guid = Guid.NewGuid();
-
-            var apiConfig = _configService?.GetConfig()?.Api?.Find(x => x.ApiName?.ToLower() == Consts.VPKI_API.ToLower());
-            string apiUrl = $"{apiConfig.Address}:{apiConfig.Port}";
-
-            using (HttpClient httpClient = new HttpClient(GetClientHandler()))
-            {
-                try
-                {
-                    //bearer token set
-                    var sessionModel = (await _localStorage.GetAsync<LoginResponseModel>(SESSION_STATE)).Value;
-                    var token = sessionModel?.AccessToken;
-                    httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", $"{token}");
-
-                    var timeOutSec = SetTimeout(timeOutSeconds);
-                    httpClient.Timeout = new TimeSpan(0, 0, timeOutSec);
-                    httpClient.BaseAddress = new Uri($"{apiUrl}{url}");
-
-                    Log4net.WriteLine($"[GET] Request({guid})::{url}{Environment.NewLine}", LogType.HTTP);
-
-                    var res = await httpClient.GetAsync(url);
-                    response = await res.Content.ReadFromJsonAsync<RESPONSE>();
-
-                    Log4net.WriteLine($"[GET] Rseponse({guid})::{url}{Environment.NewLine}{response?.ToJson()}", LogType.HTTP);
-                }
-                catch (Exception e)
-                {
-                    Log4net.WriteLine(e);
-                }
-            }
-            return response;
+            return token;
         }
     }
 }