Nord\Lumen\Cors\CorsService::isMethodAllowed PHP Method

    protected function isMethodAllowed($method)
    {
        if (!$method) {
            throw new InvalidArgument('Method cannot be empty.');
        }
        if ($this->isAllMethodsAllowed()) {
            return true;
        }
        return in_array(strtoupper($method), $this->allowMethods);
    }