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upstream backend {
  # ÂÖѯËã·¨
  server backend1.example.com;
  server backend2.example.com;
  server backend3.example.com;
  
  # ȨÖØËã·¨
  server backend4.example.com weight=2;
}

server {
    listen 80;
    server_name example.com;
    
    location / {
        proxy_pass http://backend;
        
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        hash $remote_addr consistent;
        
        # ×îÉÙÅþÁ¬Ëã·¨
        least_conn;
    }
}

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