Fail to reroute() to /

[chinkung]

I have updated F3 from 3.5 to 3.6 and found error when call $f3->reroute('/'). I found that the error come due to F3 change the way to reroute by adding PORT variable when reroute to root (/)

if ($url[0]=='/') {
			$port=$this->hive['PORT'];
			$port=in_array($port,[80,443])?'':':'.$port;
			$url=$this->hive['SCHEME'].'://'.
			$this->hive['HOST'].$port.$this->hive['BASE'].$url;
}

PORT variable is sourced from $_SERVER['SERVER_PORT'] which some proxy server didn't use it but $_SERVER['HTTP_X_FORWARDED_PORT']