git001/upstream-proxy.md

Created June 19, 2024 18:29

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Upstream-proxy Sequence diagram

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upstream-proxy.md

Sequence diagram

sequenceDiagram

  participant CL AS Client
  participant HA AS HAProxy
  participant UP AS Upstream Proxy
  participant DS AS Destination Server

  CL->>HA: Connect to HAProxy Proxy via TCP<br/>SNI is used for routing
  HA->>UP: Connect to Upstream Proxy via TCP
  HA->>UP: Send "CONNECT" and some other<br/>Upstream Proxy header
  UP->>DS: Connect to Destination Server
  DS->>UP: Successful connection to Destination Server
  HA->>DS: Successful Proxy Tunnel
  CL->>DS: TLS Handshake with the SNI from the Client
  Note over DS,CL: TLS Traffic
  CL->>DS: Closes connection

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