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http {
    upstream backend {
        server backend1.example.com;
        server backend2.example.com;
        server backend3.example.com;
    }
  
    server {
        location / {
            proxy_pass http://backend;
        }
    }
}

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http {
    proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=my_cache:10m max_size=10g
                 inactive=60m use_temp_path=off;
  
    server {
        location / {
            proxy_pass http://backend;
            proxy_cache my_cache;
            proxy_cache_valid 200 302 10m;
            proxy_cache_valid 404 1m;
        }
    }
}

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http {
    upstream backend {
        server backend1.example.com weight=5;
        server backend2.example.com;
        server backend3.example.com max_fails=3 fail_timeout=30s;
    }
  
    server {
        location / {
            proxy_pass http://backend;
        }
    }
}

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http {
    upstream backend {
        least_conn;
        server backend1.example.com;
        server backend2.example.com;
        server backend3.example.com;
    }
  
    server {
        location / {
            proxy_pass http://backend;
        }
    }
}

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http://nginx.org/en/docs/http/load_balancing.html

http://nginx.org/en/docs/http/ngx_http_proxy_module.html

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