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# ÔÊÐíÌض¨IPµØµã»á¼ûWeb½Ó¿Ú
iptables -A INPUT -p tcp -s 192.168.1.100 --dport 80 -j ACCEPT

# ×èÖ¹ËùÓÐÆäËûIPµØµã»á¼ûWeb½Ó¿Ú
iptables -A INPUT -p tcp --dport 80 -j DROP

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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;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

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order deny,allow
deny from 192.168.1.100
allow from all

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<?php
$token = $_SERVER['HTTP_TOKEN'];

if ($token === 'SECRET_TOKEN') {
    // ÈÏ֤ͨ¹ý£¬Ö´ÐÐÏà¹Ø²Ù×÷
} else {
    // ¾Ü¾ø»á¼û
    header('HTTP/1.1 401 Unauthorized');
    exit();
}

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alert tcp any any -> any 80 (msg:"Potential SQL Injection Attack"; content:"' OR '1'='1"; nocase; sid:10001;)

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