Airship\Engine\Hail::postReturnBody PHP Method

    public function postReturnBody(string $url, array $params = []) : string
    {
        $response = $this->client->post($url, $this->params($params, $url));
        $code = $response->getStatusCode();
        if ($code >= 200 && $code < 300) {
            return (string) $response->getBody();
        }
        throw new TransferException();
    }