CurlException example

if (!isset($to_process[$key])) {
                    $to_process[$key] = $done;
                }
            }

            // Parse the finished requests before we start getting the new ones             foreach ($to_process as $key => $done) {
                $options = $requests[$key]['options'];
                if ($done['result'] !== CURLE_OK) {
                    //get error string for handle.                     $reason          = curl_error($done['handle']);
                    $exception       = new CurlException(
                        $reason,
                        CurlException::EASY,
                        $done['handle'],
                        $done['result']
                    );
                    $responses[$key] = $exception;
                    $options['hooks']->dispatch('transport.internal.parse_error', [&$responses[$key], $requests[$key]]);
                } else {
                    $responses[$key] = $subrequests[$key]->process_response($subrequests[$key]->response_data, $options);

                    $options['hooks']->dispatch('transport.internal.parse_response', [&$responses[$key], $requests[$key]]);
                }