source code says Request::getMethod() is deprecated, what to use?

The source code says Request::getMethod() is deprecated. What should we use instead?

PHP Code:

    /**
     * Get the request method.
     *
     * @param boolean $upper Whether to return in upper or lower case.
     *
     * @return string
     *
     * @deprecated The $upper functionality will be removed and this will revert to its PSR-7 equivalent
     */
    public function getMethod(bool $upper = false): string
    {
        return ($upper) ? strtoupper($this->method) : strtolower($this->method);
    }