protected function _basic($request) {
		$users = $this->_config['users'];
		$username = $request->env('PHP_AUTH_USER');
		$auth = $this->_classes['auth'];
		$basic = $auth::encode($username, $request->env('PHP_AUTH_PW'));
		$encoded = ['response' => null];

		if (isset($users[$username])) {
			$encoded = $auth::encode($username, $users[$username]);
		}
		if ($basic['response'] !== $encoded['response']) {
			$this->_writeHeader("WWW-Authenticate: Basic realm=\"{$this->_config['realm']}\"");
			return;
		}
		return compact('username') + ['password' => null];
	}