理解长连接的作用.drawio

<mxfile host="app.diagrams.net" modified="2023-04-10T05:32:21.913Z" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36 Edg/111.0.1661.62" version="21.1.5" etag="xxOnEeVTQup0Ju6n96M-" type="github">
  <diagram name="第 1 页" id="W1uQTVEM11cQ6374HKFS">
    <mxGraphModel>
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
      </root>
    </mxGraphModel>
  </diagram>
</mxfile>