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WebSocket

WebSocket

Intermediatebackend1 min read
websocketswssocket.ioreal-time communicationbidirectional
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Definition

A persistent, bidirectional communication channel between browser and server for real-time data without polling.

قناة اتصال مستمرة ثنائية الاتجاه بين المتصفح والخادم للبيانات الفورية دون استطلاع.

Why It Matters

Firestore's real-time listener (onSnapshot) uses WebSockets. This is why Firestore can push updates to your browser instantly when data changes, without requiring you to poll the API.

مستمع Firestore الفوري (onSnapshot) يستخدم WebSockets. لهذا يستطيع Firestore دفع التحديثات إلى متصفحك فورًا عند تغيير البيانات، دون الحاجة إلى استطلاع API.

Full Definition

WebSockets establish a persistent TCP connection between browser and server, enabling both sides to send messages at any time without HTTP overhead. Unlike HTTP (request/response), WebSockets are full-duplex. Used for chat, collaborative editing, live notifications, and multiplayer games. Firebase Realtime Listener uses WebSockets under the hood. Vercel serverless functions don't support WebSockets — use Vercel's realtime service or Supabase Realtime.
WebSockets تُنشئ اتصال TCP مستمر بين المتصفح والخادم، مما يتيح لكليهما إرسال الرسائل في أي وقت دون حمل HTTP. تُستخدم للدردشة والتحرير التعاوني والإشعارات الفورية. Firebase Realtime Listener يستخدم WebSockets تحت الغطاء.

Example Usage

“// Firestore onSnapshot uses WebSocket under the hood: const unsubscribe = onSnapshot(doc(db, 'profiles', uid), (snap) => { setProfile(snap.data()); });”

“// Firestore onSnapshot يستخدم WebSocket تحت الغطاء: const unsubscribe = onSnapshot(doc(db, 'profiles', uid), (snap) => { setProfile(snap.data()); });”

Knowledge Graph

AI Builder Tips

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Avoid these mistakes when using WebSocket:

1

Using WebSockets when polling or Firestore snapshots would work — WebSockets add infrastructure complexity

2

Not unsubscribing from WebSocket connections on component unmount — causes memory leaks

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Help me build a project using WebSocket.

Explain:
1. What is WebSocket and why it matters
2. The core architecture and required tools
3. Step-by-step implementation plan
4. Common mistakes to avoid: Using WebSockets when polling or Firestore snapshots would work — WebSockets add infrastructure complexity, Not unsubscribing from WebSocket connections on component unmount — causes memory leaks
5. Best practices and production tips

Official Resources

Official Documentation
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