How do you handle user sessions?

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Handling user sessions means keeping track of a user’s login state after authentication so they don’t have to log in for every request. Sessions ensure continuity and security in web applications.

1. Session Creation

• When a user logs in successfully, the server creates a session ID (unique token).

• This ID is stored in a cookie and sent back to the browser.

2. Session Storage

• On the server, session data (user ID, roles, preferences) is stored in memory, DB, or cache (e.g., Redis).

• On each request, the browser sends the session cookie → server validates it → user stays logged in.

3. Session Handling in Spring Boot

• By default, Spring Security manages sessions via HttpSession.

• Example:

session.setAttribute("user", loggedInUser);

• Configuration options:

  • always → Always create a session.

  • ifRequired → Create only when needed.

  • never → Don’t create, but use existing.

  • stateless → No sessions (JWT approach).

4. Session Timeout & Security

• Sessions expire after inactivity (e.g., 30 mins).

• Use session.invalidate() for logout.

• Prevent attacks with HttpOnly cookies, SameSite policy, and CSRF protection.

5. Alternative: JWT (Stateless Sessions)

• Instead of server-stored sessions, issue a JWT token after login.

• Token is stored in localStorage/cookie and sent with every request (Authorization: Bearer <token>).

• Server validates token without storing session data → scalable for microservices.

👉 In short, user sessions can be handled via server-managed sessions (traditional) or JWT tokens (stateless) depending on app needs.

Read More :

What are protected/private routes in React?

How do you implement login/logout functionality?

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