    public function __construct($scheme, $userinfo, $host, $port, $path, $query, $fragment) {
        $this->scheme = is_null($scheme) || ctype_lower($scheme) ? $scheme : strtolower($scheme);
        $this->userinfo = $userinfo;
        $this->host = $host;
        $this->port = is_null($port) ? $port : (int) $port;
        $this->path = $path;
        $this->query = $query;
        $this->fragment = $fragment;
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.