public static function getContent(ResponseInterface $response)
    {
        if ($response->getStatusCode() === 204) {
            return [];
        }

        $body = (string) $response->getBody();

        if (!$body) {
            return [];
        }

        if (strpos($response->getHeaderLine('Content-Type'), 'application/json') !== 0) {
            throw new DecodingFailedException('The content type header was not application/json.');
        }

        return self::jsonDecode($body);
    }