browser.php
public function retry()
    {
        $frames = $this->page->getFrameFocus();
        if (count($frames) > 0) {
            $this->loadFrame(
                    $frames,
                    $this->page->getUrl(),
                    $this->page->getRequestData());

            return $this->page->getRaw();
        }
        if ($url = $this->history->getUrl()) {
            $this->page = $this->fetch($url, $this->history->getParameters());

            return $this->page->getRaw();
        }

        return false;
    }
public function retry()
    {
        $frames = $this->page->getFrameFocus();
        if (count($frames) > 0) {
            $this->loadFrame(
                    $frames,
                    $this->page->getUrl(),
                    $this->page->getRequestData());

            return $this->page->getRaw();
        }
        if ($url = $this->history->getUrl()) {
            $this->page = $this->fetch($url, $this->history->getParameters());

            return $this->page->getRaw();
        }

        return false;
    }
Equivalent to hitting the retry button on the browser.
Will attempt to repeat the page fetch.
If there is no history to repeat it will give false.

@return string/boolean   Content if fetch succeeded else false.