Simple forged X-Forwarded-For-bug warning-the black bar safety net

On the forged X-Forwarded-For purposes I will not say more. In the invasion of a PHP station, the GPC is ON, Character type injection all., while in PHP5, the GPC the default is open. But GPC for$SERVER without any effect, So you can fake the$SERVER to achieve the injection to the purpose. IP. in...