public function removeHeader($key) {

		if(false === is_string($key)) {
			return trigger_error(sprintf('Argument 1 passed to %s() must be of the type string, "%s" given', __METHOD__, gettype($key)), E_USER_ERROR);
		}

		if(true === isset($this -> headers['custom'][$key])) {
			unset($this -> headers['custom'][$key]);
		}
	}