diff --git a/backend/src/main.ts b/backend/src/main.ts
index f381fe3..bbde0f4 100644
--- a/backend/src/main.ts
+++ b/backend/src/main.ts
@@ -7,7 +7,7 @@ async function bootstrap(): Promise<void> {
   app.enableCors({
     origin: 'http://localhost:5173', // replace with your client's origin
     methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
-    allowedHeaders: 'Content-Type, Accept, Authorization',
+    allowedHeaders: 'Content-Type, Accept, Authorization, Cache-Control',
     credentials: true
   });
   const config = new DocumentBuilder()
diff --git a/backend/src/modules/product/entities/product.entity.ts b/backend/src/modules/product/entities/product.entity.ts
index c7316c9..8a6c188 100644
--- a/backend/src/modules/product/entities/product.entity.ts
+++ b/backend/src/modules/product/entities/product.entity.ts
@@ -8,12 +8,12 @@ import {
 } from 'typeorm';
 
 export enum ProductStatus {
-  REVIEWING,
-  PUBLISHED,
-  EXCHANGING,
-  EXCHANGED,
-  BANNED,
-  REMOVED
+  REVIEWING = 'REVIEWING',
+  PUBLISHED = 'PUBLISHED',
+  EXCHANGING = 'EXCHANGING',
+  EXCHANGED = 'EXCHANGED',
+  BANNED = 'BANNED',
+  REMOVED = 'REMOVED'
 }
 
 @Entity('products')
diff --git a/backend/src/modules/transactions/entities/ExchangeEntity.ts b/backend/src/modules/transactions/entities/ExchangeEntity.ts
index 51c8e16..a77dc27 100644
--- a/backend/src/modules/transactions/entities/ExchangeEntity.ts
+++ b/backend/src/modules/transactions/entities/ExchangeEntity.ts
@@ -8,9 +8,9 @@ import {
 } from 'typeorm';
 
 export enum ExchangeStatus {
-  PENDING,
-  ACCEPTED,
-  REJECTED
+  PENDING = 'PENDING',
+  ACCEPTED = 'ACCEPTED',
+  REJECTED = 'REJECTED'
 }
 
 @Entity('exchange')
diff --git a/backend/src/modules/transactions/web/exchange-request.controller.ts b/backend/src/modules/transactions/web/exchange-request.controller.ts
index 191a8f2..c79a7bd 100644
--- a/backend/src/modules/transactions/web/exchange-request.controller.ts
+++ b/backend/src/modules/transactions/web/exchange-request.controller.ts
@@ -16,6 +16,7 @@ import {
 } from '../../user/notification.entity';
 
 @Controller('exchanges')
+@UseGuards(JwtAuthGuard)
 export class ExchangeRequestController {
   constructor(
     private readonly productService: ProductService,
@@ -24,7 +25,6 @@ export class ExchangeRequestController {
   ) {}
 
   @Post('/accept/:exchangeId')
-  @UseGuards(JwtAuthGuard)
   async acceptExchangeRequest(
     @Param('exchangeId') exchangeId: number
   ): Promise<ExchangeEntity> {
@@ -49,7 +49,6 @@ export class ExchangeRequestController {
   }
 
   @Post('/reject/:exchangeId')
-  @UseGuards(JwtAuthGuard)
   async rejectExchangeRequest(
     @Param('exchangeId') exchangeId: number
   ): Promise<ExchangeEntity> {
@@ -74,7 +73,6 @@ export class ExchangeRequestController {
   }
 
   @Post('/request')
-  @UseGuards(JwtAuthGuard)
   async create(
     @Body() exchangeRequestBody: ExchangeRequestBodyDto
   ): Promise<ExchangeEntity> {
@@ -97,10 +95,6 @@ export class ExchangeRequestController {
           productExchanged,
           exchangeRequest
         );
-        void this.changeStatusOfProductToExchanging(
-          exchangeRequestBody.productId,
-          exchangeRequestBody.productToExchangeId
-        );
         return exchangeRequest;
       });
   }
diff --git a/backend/src/modules/user/notification.entity.ts b/backend/src/modules/user/notification.entity.ts
index ae97fd7..d2b0bfd 100644
--- a/backend/src/modules/user/notification.entity.ts
+++ b/backend/src/modules/user/notification.entity.ts
@@ -9,7 +9,7 @@ import {
 import {UserEntity} from './user.entity';
 
 export enum NotificationType {
-  EXCHANGE_REQUEST
+  EXCHANGE_REQUEST = 'EXCHANGE_REQUEST'
 }
 
 @Entity('notifications')
diff --git a/backend/src/modules/user/user.entity.ts b/backend/src/modules/user/user.entity.ts
index f07c57f..a2285b6 100644
--- a/backend/src/modules/user/user.entity.ts
+++ b/backend/src/modules/user/user.entity.ts
@@ -11,8 +11,8 @@ import {PartialType} from '@nestjs/swagger';
 import {NotificationEntity} from './notification.entity';
 
 export enum UserStatus {
-  ACTIVE,
-  BANNED
+  ACTIVE = 'ACTIVE',
+  BANNED = 'BANNED'
 }
 
 @Entity('users')
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index 2b7ab13..84263d5 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -8,18 +8,20 @@ import './index.css';
 import '@assets/styles/styles.scss';
 import {AuthProviderProps} from 'oidc-react/build/src/AuthContextInterface';
 import {AuthProvider} from 'oidc-react';
+import React from 'react';
 
 const oidcConfig: AuthProviderProps = {
   authority: import.meta.env.VITE_APP_AUTHORITY as string,
   clientId: import.meta.env.VITE_APP_CLIENT_ID as string,
   responseType: 'code',
-  redirectUri: import.meta.env.VITE_APP_REDIRECT_URI as string
+  redirectUri: import.meta.env.VITE_APP_REDIRECT_URI as string,
+  autoSignIn: false
 };
 
 ReactDOM.createRoot(document.getElementById('root')!).render(
-  // <React.StrictMode>
-  <AuthProvider {...oidcConfig}>
-    <App />
-  </AuthProvider>
-  // </React.StrictMode>
+  <React.StrictMode>
+    <AuthProvider {...oidcConfig}>
+      <App />
+    </AuthProvider>
+  </React.StrictMode>
 );
diff --git a/frontend/src/modules/homepage/model/productDto.ts b/frontend/src/modules/homepage/model/productDto.ts
index b0a5bb7..51a9711 100644
--- a/frontend/src/modules/homepage/model/productDto.ts
+++ b/frontend/src/modules/homepage/model/productDto.ts
@@ -17,12 +17,12 @@ export interface ProductDTO {
 }
 
 export enum ProductStatus {
-  REVIEWING,
-  PUBLISHED,
-  EXCHANGING,
-  EXCHANGED,
-  BANNED,
-  REMOVED
+  REVIEWING = 'REVIEWING',
+  PUBLISHED = 'PUBLISHED',
+  EXCHANGING = 'EXCHANGING',
+  EXCHANGED = 'EXCHANGED',
+  BANNED = 'BANNED',
+  REMOVED = 'REMOVED'
 }
 
 export const getProductStatusDisplay = (
diff --git a/frontend/src/modules/shared/components/header/AppHeader.tsx b/frontend/src/modules/shared/components/header/AppHeader.tsx
index 7c2f53a..9714cd3 100644
--- a/frontend/src/modules/shared/components/header/AppHeader.tsx
+++ b/frontend/src/modules/shared/components/header/AppHeader.tsx
@@ -10,12 +10,14 @@ import {formatDistanceToNow} from 'date-fns';
 import {vi} from 'date-fns/locale';
 import {ExchangeResponseModal} from '../../../transactions/components/exchange-response-modal/ExchangeResponseModal.tsx';
 import {useModal} from '../modal/useModal.tsx';
+import {useApplicationService} from '../../services/application.service.ts';
 
 export default function AppHeader({
   currentUser
 }: {
   currentUser: UserDto | null;
 }): ReactElement {
+  const applicationService = useApplicationService();
   const navigate = useNavigate();
   const [showNotifications, setShowNotifications] = useState(false);
   const modalContext = useModal();
@@ -183,13 +185,16 @@ export default function AppHeader({
               </div>
               <div
                 className="user-info d-flex flex-row align-items-center gap-2 btn"
-                data-bs-toggle="offcanvas"
+                data-bs-toggle={currentUser ? 'offcanvas' : undefined}
                 data-bs-target="#popup-profile"
                 aria-controls="popup-profile"
+                onClick={() => !currentUser && applicationService.signIn()}
               >
                 <i className="user-avatar fs-5 bi bi-person-circle"></i>
                 <div className="user-full-name regular-14">
-                  {currentUser?.firstName} {currentUser?.lastName}
+                  {currentUser
+                    ? `${currentUser.firstName} ${currentUser.lastName}`
+                    : 'Login'}
                 </div>
               </div>
               <ProfileOffCanvas currentUser={currentUser} />
diff --git a/frontend/src/modules/shared/models/userDto.ts b/frontend/src/modules/shared/models/userDto.ts
index 925c685..5a2adbe 100644
--- a/frontend/src/modules/shared/models/userDto.ts
+++ b/frontend/src/modules/shared/models/userDto.ts
@@ -18,5 +18,5 @@ export interface NotificationDto {
 }
 
 export enum NotificationType {
-  EXCHANGE_REQUEST
+  EXCHANGE_REQUEST = 'EXCHANGE_REQUEST'
 }
diff --git a/frontend/src/modules/shared/services/application.service.ts b/frontend/src/modules/shared/services/application.service.ts
index 5aecf61..36f9bd2 100644
--- a/frontend/src/modules/shared/services/application.service.ts
+++ b/frontend/src/modules/shared/services/application.service.ts
@@ -28,17 +28,19 @@ class ApplicationService {
     return response.data;
   }
 
+  public signIn(): void {
+    void this.auth?.signIn();
+  }
+
   public signOutRedirect(): void {
-    if (this.auth) {
-      this.auth
-        .signOutRedirect()
-        .then(() => {
-          alert('Successfully logged out');
-        })
-        .catch(error => {
-          alert(error);
-        });
-    }
+    this.auth
+      ?.signOutRedirect()
+      .then(() => {
+        alert('Successfully logged out');
+      })
+      .catch(error => {
+        alert(error);
+      });
   }
 
   public isAuthenticated(): boolean {
@@ -48,12 +50,12 @@ class ApplicationService {
   public createApiClient(): AxiosInstance {
     const apiClient: AxiosInstance = axios.create();
     const accessToken: string | undefined = this.auth?.userData?.access_token;
-
     apiClient.interceptors.request.use(
       config => {
         if (accessToken) {
           config.headers.Authorization = `Bearer ${accessToken}`;
         }
+        config.headers['Cache-Control'] = 'no-cache';
         this.startLoading();
         return config;
       },