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http {
    # ½ç˵upstream£¬Ö¸¶¨ÕæʵЧÀÍÆ÷¼¯Èº
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        server 192.168.1.1:8080;
        server 192.168.1.2:8080;
        server 192.168.1.3:8080;
    }

    # ½ç˵·´ÏòÊðÀí
    server {
        listen 80;
        server_name example.com;

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

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upstream backend {
    server 192.168.1.1:8080;
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}

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upstream backend {
    server 192.168.1.1:8080 weight=3;
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    server 192.168.1.3:8080 weight=1;
}

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upstream backend {
    ip_hash;
    server 192.168.1.1:8080;
    server 192.168.1.2:8080;
    server 192.168.1.3:8080;
}

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upstream backend {
    least_conn;
    server 192.168.1.1:8080;
    server 192.168.1.2:8080;
    server 192.168.1.3:8080;
}

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