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location / {
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    if ($request_method !~ ^(GET|HEAD|POST)$) {
        return 444;
    }

    if ($http_referer !~ ^(https?://(www.)?example.com)) {
        return 403;
    }

    if ($http_cookie !~ "csrf_token=([^;]+)(?:;|$)") {
        return 403;
    }

    # ÔÚ´Ë´¦¾ÙÐÐÆäËû´¦Àí
}

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<form method="post" action="/submit">
    <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
    <input type="submit" value="Ìá½»">
</form>

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location / {
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    # ÔÚ´Ë´¦¾ÙÐÐÆäËû´¦Àí
}

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function escapeHtml(input) {
    return input.replace(/&/g, '&')
                .replace(/</g, '<')
                .replace(/>/g, '>')
                .replace(/"/g, '"')
                .replace(/'/g, ''');
}

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