503 not catch properly

[IgorMijatovic]

{
    $headers = array('Content-Type: application/json', 'X-WSSE: ' . $this->getAuthenticationSignature());
    $uri = $this->baseUrl . $uri;

    try {
        $responseJson = $this->client->send($method, $uri, $headers, $body);
    } catch (\Exception $e) {
        throw new ServerException($e->getMessage());
    }

    $responseArray = json_decode($responseJson, true);

    if ($responseArray === null) {
        switch (json_last_error()) {
            case JSON_ERROR_DEPTH:
                throw new ClientException('JSON response could not be decoded, maximum depth reached.');
            default:
                throw new ServerException("JSON response could not be decoded:\n" . json_last_error_msg());
        }
    }

    if (is_array($responseArray) === false) {
        throw new ServerException("JSON response is not an array:\n" . $responseArray);
    }

    return new Response($responseArray);
}

---

in responseJson i got ofter and ofter response
"

503 Service Unavailable

No server is available to handle this request. ";

after json_decode
$responseArray = null and then we throw Exception throw new ServerException("JSON response could not be decoded:\n" . Instead there is no problem with Json encode, there is problem with server and i would rather throw ServerException with payload, methods, uri info :)