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server {
    listen       80;
    server_name  example.com;

    location / {
        proxy_pass http://backend_servers;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

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upstream backend_servers {
    server 192.168.0.1:8080;
    server 192.168.0.2:8080;
    server 192.168.0.3:8080;
    server 192.168.0.4:8080;
}

server {
    listen       80;
    server_name  example.com;

    location / {
        proxy_pass http://backend_servers;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

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location /check {
    access_log off;
    proxy_pass http://backend_servers;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
}

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