'options'  => $options
                        ];
                        return \GuzzleHttp\Promise\rejection_for($reason);
                    }
                );
            };
        };
    }

    /**
     * Middleware that invokes a callback before and after sending a request.
     *
     * The provided listener cannot modify or alter the response. It simply
     * "taps" into the chain to be notified before returning the promise. The
     * before listener accepts a request and options array, and the after
     * listener accepts a request, options array, and response promise.
     *
     * @param callable $before Function to invoke before forwarding the request.
     * @param callable $after  Function invoked after forwarding.
     *
     * @return callable Returns a function that accepts the next handler.
     */
    public static function tap(callable $before = null, callable $after = null)
    {
        return function (callable $handler) use ($before, $after) {
            return function ($request, array $options) use ($handler, $before, $after) {
                if ($before) {
                    $before($request, $options);
                }
                $response = $handler($request, $options);
                if ($after) {
                    $after($request, $options, $response);
                }
                return $response;
            };
        };
    }

    /**
     * Middleware that handles request redirects.
     *
     * @return callable Returns a function that accepts the next handler.
     */
    public static function redirect()
    {
        return function (callable $handler) {
            return new RedirectMiddleware($handler);
        };
    }

    /**
     * Middleware that retries requests based on the boolean result of
     * invoking the provided "decider" function.
     *
     * If no delay function is provided, a simple implementation of exponential
     * backoff will be utilized.
     *
     * @param callable $decider Function that accepts the number of retries,
     *                          a request, [response], and [exception] and
     *                          returns true if the request is to be retried.
     * @param callable $delay   Function that accepts the number of retries and
     *                          returns the number of milliseconds to delay.
     *
     * @return callable Returns a function that accepts the next handler.
     */
    public static function retry(callable $decider, callable $delay = null)
    {
        return function (callable $handler) use ($decider, $delay) {
            return new RetryMiddleware($decider, $handler, $delay);
        };
    }

    /**
     * Middleware that logs requests, responses, and errors using a message
     * formatter.
     *
     * @param LoggerInterface  $logger Logs messages.
     * @param MessageFormatter $formatter Formatter used to create message strings.
     * @param string           $logLevel Level at which to log requests.
     *
     * @return callable Returns a function that accepts the next handler.
     */
    public static function log(LoggerInterface $logger, MessageFormatter $formatter, $logLevel = 'info' /* \Psr\Log\LogLevel::INFO */)
    {
        return function (callable $handler) use ($logger, $formatter, $logLevel) {
            return function ($request, array $options) use ($handler, $logger, $formatter, $logLevel) {
                return $handler($request, $options)->then(
                    function ($response) use ($logger, $request, $formatter, $logLevel) {
                        $message = $formatter->format($request, $response);
                        $logger->log($logLevel, $message);
                        return $response;
                    },
                    function ($reason) use ($logger, $request, $formatter) {
                        $response = $reason instanceof RequestException
                            ? $reason->getResponse()
                            : null;
                        $message = $formatter->format($request, $response, $reason);
                        $logger->notice($message);
                        return \GuzzleHttp\Promise\rejection_for($reason);
                    }
                );
            };
        };
    }

    /**
     * This middleware adds a default content-type if possible, a default
     * content-length or transfer-encoding header, and the expect header.
     *
     * @return callable
     */
    public static function prepareBody()
    {
        return function (callable $handler) {
            return new PrepareBodyMiddleware($handler);
        };
    }

    /**
     * Middleware that applies a map function to the request before passing to
     * the next handler.
     *
     * @param callable $fn Function that accepts a RequestInterface and returns
     *                     a RequestInterface.
     * @return callable
     */
    public static function mapRequest(callable $fn)
    {
        return function (callable $handler) use ($fn) {
            return function ($request, array $options) use ($handler, $fn) {
                return $handler($fn($request), $options);
            };
        };
    }

    /**
     * Middleware that applies a map function to the resolved promise's
     * response.
     *
     * @param callable $fn Function that accepts a ResponseInterface and
     *                     returns a ResponseInterface.
     * @return callable
     */
    public static function mapResponse(callable $fn)
    {
        return function (callable $handler) use ($fn) {
            return function ($request, array $options) use ($handler, $fn) {
                return $handler($request, $options)->then($fn);
            };
        };
    }
}

Fatal error: Uncaught Error: Class 'GuzzleHttp\Middleware' not found in /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/vendor/guzzlehttp/guzzle/src/HandlerStack.php:43
Stack trace:
#0 /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttp\HandlerStack::create()
#1 /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/Helpers/Api/ApiHandler.php(103): GuzzleHttp\Client->__construct(Array)
#2 /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/Helpers/Api/ApiHandler.php(65): CCDN\Helpers\Api\ApiHandler->_createClient(20, false)
#3 /var/www/u116785/data/www/kinolis.com/engine/modules/ccdn-calendar-fullstory.php(39): CCDN\Helpers\Api\ApiHandler->__construct()
#4 /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/Helpers/Modules/CCDNModule.php(27): dle_template::{closure}('MODULE_CALENDAR...', Object(CCDN\Helpers\Caching\Cache))
#5 /var/www/u116785/data/www/kinolis.com/engine/modules/ccdn-calendar-fullstory.php(191): CCDN\Helpers\Modules\CCDNModule::run('MODULE_ in /var/www/u116785/data/www/kinolis.com/engine/inc/CCDN/vendor/guzzlehttp/guzzle/src/HandlerStack.php on line 43