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        server backend2.example.com;
        server backend3.example.com;
    }
    
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        listen 80;
        location / {
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        }
    }
}

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        server backend2.example.com;
        server backend3.example.com;
    }
    
    server {
        listen 80;
        location / {
            proxy_pass http://backend;
        }
    }
}

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http {
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        server backend2.example.com;
        server backend3.example.com;
    }
    
    server {
        listen 80;
        location / {
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        }
    }
}

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http {
    upstream backend {
        server backend1.example.com;
        server backend2.example.com weight=2;
        server backend3.example.com;
    }
    
    server {
        listen 80;
        location / {
            proxy_pass http://backend;
        }
    }
}

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