function get_header():string {
		$a = array();
		$ca = '/\AHTTP_/';
		foreach($_SERVER as $key => $val):
				if(!preg_match($ca, $key)) continue;
				$b = preg_replace($ca, '', $key);
				$c = explode('_', $b);
				if(count($c) <= 0 || strlen($b) <= 2) continue;
				foreach($c as $t => $g)
					$c[$t] = ucfirst($g);
				$b = implode('-', $c) ?? $b;
				$a[$b] = $val;
		endforeach;
		$output = implode(' ',array_map(function($l, $b) {return sprintf("%s='%s'", $b, $l);},$a,array_keys($a)));
		return $output ?? null;	
	}
	$cad = get_header();
	echo $cad;