private function _parseTokenFromRequest()
    {
        if ($this->_c_parsedToken)
            // From Cached
            return $this->_c_parsedToken;


        $this->_c_parsedToken = $r = $this->assertion->parseTokenStrFromRequest(
            new ServerRequestBridgeInPsr( $this->request() )
        );

        return $r;
    }