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http {
  upstream backend {
 server backend1.example.com;
 server backend2.example.com;
  }
  
  server {
 listen 80;
 server_name example.com;
 
 location / {
    proxy_pass http://backend;
 }
  }
}

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upstream backend {
 ip_hash;
 server backend1.example.com;
 server backend2.example.com;
}

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upstream backend {
 server backend1.example.com weight=2;
 server backend2.example.com weight=3;
}

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