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http {

    upstream backend {
        server backend1.example.com weight=5 max_fails=3 fail_timeout=30s;
        server backend2.example.com backup;
    }
    
    server {
        listen 80;
        server_name example.com;
    
        location / {
            proxy_pass http://backend;
            proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
            proxy_connect_timeout 2s;
            proxy_set_header Host $host;
        }
    }
}

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