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

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location / {
    proxy_pass http://backend;
}

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

    health_check;
}

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upstream backend {
    server backend1.example.com;
    server backend2.example.com down;
    server backend3.example.com;

    health_check;
}

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upstream backend {
    server backend1.example.com max_fails=3 fail_timeout=30s;
    server backend2.example.com down;
    server backend3.example.com max_fails=3 fail_timeout=30s;

    health_check;
}

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