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| Feature | Stateless | Stateful | | :--- | :--- | :--- | | | Stored client-side (JWT) or in external cache (Redis) | Stored in server memory | | Scaling | Easy (add any instance) | Hard (requires sharding or sticky sessions) | | Resilience | High (server dies, no data loss) | Low (server dies, session dies) | | Use case | REST APIs, Serverless | WebSockets, Gaming, File uploads |
Your Facebook profile picture is more than just a photo — it’s your first impression.
Whether you’re networking, running a business, or just keeping in touch with friends, your profile image shows up everywhere: in comments, Messenger, Groups, search results, and friend suggestions.
But here’s the problem: Facebook crops and resizes profile pictures in different ways across devices. What looks great in your upload might look awkward on mobile or get cut off in a circle crop.
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| Feature | Stateless | Stateful | | :--- | :--- | :--- | | | Stored client-side (JWT) or in external cache (Redis) | Stored in server memory | | Scaling | Easy (add any instance) | Hard (requires sharding or sticky sessions) | | Resilience | High (server dies, no data loss) | Low (server dies, session dies) | | Use case | REST APIs, Serverless | WebSockets, Gaming, File uploads |
