    public function getMethod()
    {
        if (null !== $this->method) {
            return $this->method;
        }

        $this->method = strtoupper($this->server->get('REQUEST_METHOD', 'GET'));

        if ('POST' !== $this->method) {
            return $this->method;
        }

        $method = $this->headers->get('X-HTTP-METHOD-OVERRIDE');

        if (!$method && self::$httpMethodParameterOverride) {
            $method = $this->request->get('_method', $this->query->get('_method', 'POST'));
        }

        if (!\is_string($method)) {
            return $this->method;
        }

        $method = strtoupper($method);

        if (\in_array($method, ['GET', 'HEAD', 'POST', 'PUT', 'DELETE', 'CONNECT', 'OPTIONS', 'PATCH', 'PURGE', 'TRACE'], true)) {
            return $this->method = $method;
        }

        if (!preg_match('/^[A-Z]++$/D', $method)) {
            throw new SuspiciousOperationException(sprintf('Invalid method override "%s".', $method));
        }

        return $this->method = $method;
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.