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构流之界面,勿使其繁复
Vimal · 2026-05-24 · via DEV Community
Cover image for Build a streaming UI without overcomplicating it

Vimal

若尔所建之界面,需显进境、录文或实时更新,毋须遽用WebSockets。多般情形下,SSE乃更简且适之择。此乃服务器以HTTP推事件于客户端之友浏览器之法。思之如单行之活流:服务器送更新,浏览器则听之。

需此者,SSE实为良选。服务器至客户端之流。 欲简其制。

SSE 为何物?

SSE 乃 Server-Sent Events 之谓也。

此乃浏览器原生之法,使服务器能以 HTTP 推送更新于客户端。

何时宜用 SSE

宜用 SSE 者 不宜用 SSE 者
其沟通乃 单行之道 尔需双向交谈
尔欲避轮询之苦 尔需低时延之令行控制
尔欲轻便之HTTP流 尔需二进制传输
尔欲其浏览器可本地处理连接

例:

  • 进度更新
  • 实时日志
  • 状态信息
  • 任务完成通知

何以用服务器发送事件而非轮询?

轮询即浏览器频向服务器索新数据,此致额外流量与时序之拙。

SSE为优,盖因:

  • 浏览器开一连接,
  • 服务器即时发事件,
  • 客户端立得更新,
  • 免复询之劳。 小流式界面,SSE常为至简之选。

后端现块流,前端以听之。EventSource其流也直:

  1. 后端每块皆作SSE事件书之
  2. 前端实时受每块之至
  3. 界面随至而呈更新
  4. 应用视流之竟为常态之终,非谬误

此尤宜于进境之UI、日志及状况之更新

参考

全码在此处:

此例所行何事

后端

ASP.NET端点以SSE方式发送流式数据块。

前端

Angular服务创建EventSource,将流暴露于组件。