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http {
  upstream backend {
    server backend1.example.com;
    server backend2.example.com;
    server backend3.example.com;
  }

  server {
    listen 80;
    location / {
      proxy_pass http://backend;
    }
  }
}

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http {
  upstream backend {
    server backend1.example.com max_conns=100;
    server backend2.example.com max_conns=100;
    server backend3.example.com max_conns=100;
  }

  keepalive_timeout 65;
  keepalive_requests 1000;
}

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http {
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  server {
    listen 80;
    location / {
      proxy_pass http://backend;
      proxy_cache my_cache;
      proxy_cache_valid 200 1d;
    }
  }
}

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http {
  gzip on;
  gzip_types text/plain text/html text/css application/javascript;

  server {
    listen 80;
    location / {
      proxy_pass http://backend;
    }
  }
}

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