Clue\React\Buzz\Io\Transaction::next PHP Method

    protected function next(RequestInterface $request)
    {
        $this->progress('request', array($request));
        $that = $this;
        ++$this->numRequests;
        $promise = $this->sender->send($request, $this->messageFactory);
        if (!$this->streaming) {
            $promise = $promise->then(array($that, 'bufferResponse'));
        }
        return $promise->then(function (ResponseInterface $response) use($request, $that) {
            return $that->onResponse($response, $request);
        }, function ($error) use($request, $that) {
            return $that->onError($error, $request);
        });
    }