Web 相关的安全性加强

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ServerTokens Prod
ServerSignature Off

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http {
    server_tokens  off;
}

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expose_php = Off

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// ci/core/Input.php
// ci/core/Security.php
// ci/libraries/Session.php
// ci/libraries/captcha.php
setcookie($prefix.$name, $value, $expire, $path, $domain, $secure, TRUE);

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