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SSE - Server Sent Events

  • Communication Client → Server

  • Communication Server → Client

    • Push notifications - Apps
    • Long-polling
    • WebSockets
    • GraphQL pub/sub - another mullet
    • Server Sent Events

  • Push notifications

    • Apps - mobile
    • Browsers
    • Can be disabled
    • Not event-driven

  • Long-polling

    • Old technic
    • Not performative
    • Can increase costs
    • Not event-driven

  • WebSocket

    • New protocol
    • Bi-directional
    • Event driven
    • Proxy problems - enterprise firewalls

  • Server Sent Events

    • Based on HTTP
    • Event driven
    • Reconnection and event id by default
    • No problems with proxy and firewalls
    • Just one direction - Server → Client
    • Only UTF-8

Examples:

  • WebSockets
    • Chat
    • Multiplayer games
    • Collaborative editing and coding
  • SSE
    • Stock ticker streaming
    • Notifications
    • Twitter feed updating

Disclaimers:

  • Almost everything can be done on both, WebSockets and SSE

Let's code...