Summary

Keywords

websocket tutorial real time communication realtime apps websocket ios websocket android ios system design android system design mobile system design realtime updates websocket vs http polling server sent events sse vs websocket

Full Transcript

🚀 Struggling with Big Tech interview prep? Book a 1-on-1 mentorship session to master mobile system design, coding, and behavioral rounds, with realistic mock interviews and actionable feedback from an ex-Meta engineer. 👉 https://andrey-tech.com Learn how WebSockets work, how they compare to HTTP polling, long polling, and SSE, and how to design WebSocket APIs for iOS and Android. Chapters: 0:00 Intro 0:27 Ways to implement real-time updates 1:04 Push notifications 1:30 HTTP Polling 2:09 Long-Polling 2:50 SSE (Server-Sent Events) 4:26 WebSockets overview 7:03 How to design WebSocket API 9:09 Implementing WebSockets on iOS (URLSessionWebSocketTask) 10:30 WebSockets on Android (OkHttp) 11:02 Handling app background states 11:31 Heartbeats (ping / pong)