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}

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server {
    gzip on;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/javascript application/json;
    ......
}

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    location / {
        proxy_pass http://backend_server;
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    }
}

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}

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    server backend_server1 weight=3;
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}

server {
    location / {
        proxy_pass http://backend;
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    }
}

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