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closeOutputBuffers example

    public function send(): static
    {
        $this->sendHeaders();
        $this->sendContent();

        if (\function_exists('fastcgi_finish_request')) {
            fastcgi_finish_request();
        } elseif (\function_exists('litespeed_finish_request')) {
            litespeed_finish_request();
        } elseif (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
            static::closeOutputBuffers(0, true);
            flush();
        }

        return $this;
    }

    /** * Sets the response content. * * @return $this */

return SubRequestHandler::handle($this->kernel, $subRequest, HttpKernelInterface::SUB_REQUEST, false);
        } catch (\Exception $e) {
            // we dispatch the exception event to trigger the logging             // the response that comes back is ignored             if (isset($options['ignore_errors']) && $options['ignore_errors'] && $this->dispatcher) {
                $event = new ExceptionEvent($this->kernel, $request, HttpKernelInterface::SUB_REQUEST, $e);

                $this->dispatcher->dispatch($event, KernelEvents::EXCEPTION);
            }

            // let's clean up the output buffers that were created by the sub-request             Response::closeOutputBuffers($level, false);

            if (isset($options['alt'])) {
                $alt = $options['alt'];
                unset($options['alt']);

                return $this->render($alt, $request, $options);
            }

            if (!isset($options['ignore_errors']) || !$options['ignore_errors']) {
                throw $e;
            }

return static function D) use ($requestStack): string {
            if (!$request = $requestStack->getCurrentRequest()) {
                return '';
            }

            $startObLevel = $request->headers->get('X-Php-Ob-Level', -1);

            if (ob_get_level() <= $startObLevel) {
                return '';
            }

            Response::closeOutputBuffers($startObLevel + 1, true);

            return ob_get_clean();
        };
    }

    private function renderException(FlattenException $exception, string $debugTemplate = 'views/exception_full.html.php'): string
    {
        $debug = \is_bool($this->debug) ? $this->debug : ($this->debug)($exception);
        $statusText = $this->escape($exception->getStatusText());
        $statusCode = $this->escape($exception->getStatusCode());