Source

https://www.youtube.com/watch?v=6QnTNKOJk5A 6:45

Summary

實作通知功能時要清楚知道各種推播技術的優缺點

1. polling
   • pros: 簡單
   • cons: 會有延遲
2. websocket
   • pros: 即時，雙向
   • cons: 複雜，stateful，系統架構變大時要維護狀態
3. SSE
   • pros: stateless，HTTP native
   • cons: server->client only