Many developers confuse these two
- WebSocket
- HTTP Polling
Both enable client-server communication, but they work very differently.
HTTP Polling
- Client repeatedly asks the server
Any new data?
- Even if nothing changed, requests keep coming.
- Simple to implement but can waste bandwidth and increase latency.
Example:
Client → Server: Any updates?
Server → No
5 seconds later...
Client → Server: Any updates?
Server → Yes, here's the data.
WebSocket
- A single persistent connection is established.
- Server can push updates instantly.
- No need to keep asking.
Example:
Connection established ✅
Server → New message!
Server → Order status updated!
Server → Live score changed!
When to use Polling
- Simple dashboards
- Legacy systems
-Apps where updates aren't frequent
When to use WebSocket
- Chat applications
- Live notifications
- Stock market dashboards
- Multiplayer games
- Real-time collaboration tools
Easy way to remember:
- HTTP Polling = Are we there yet? (keeps asking)
- WebSocket = I will let you know when something happens.
Choosing the right communication model can significantly improve your app's performance and user experience..
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Two backend engineers designed the same API.
Design A 👇
GET /users
GET /users/1
POST /users
DELETE /users/1
Design B 👇
GET /getUsers
GET /getUserById?id=1
POST /createUser
DELETE /deleteUser?id=1
Which one gets approved?
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10 System Design concepts every developer should master:
1. Scalability — design systems that handle increasing traffic and users
2. Load Balancing — distribute traffic across multiple servers efficiently
3. Caching — improve performance by storing frequently accessed data
4. Databases — understand SQL, NoSQL, replication, and sharding
5. Microservices — break applications into independent services
6. Message Queues — enable asynchronous communication between services
7. API Gateway — manage routing, authentication, and rate limiting
8. Fault Tolerance — build systems that continue working during failures
9. Distributed Systems — manage communication across multiple machines
10. Monitoring & Logging — track system health, errors, and performance
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Content authored by @ai_explorer25
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