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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 {
    gzip on;
    gzip_comp_level 5;
    gzip_min_length 256;
    gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    server {
        listen 80;
        
        location / {
            ...
        }
    }
}

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http {
    proxy_cache_path /tmp/nginx_cache levels=1:2 keys_zone=my_cache:10m max_size=10g;
    
    server {
        listen 80;
        
        location / {
            proxy_cache my_cache;
            proxy_cache_valid 200 302 10m;
            proxy_cache_valid 404 1m;
            proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
            
            ...
        }
    }
}

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