if (browser == null) {
LOGGER.warn("Invalid ID in: {}", request);
// re-capture browser as standalone
response.sendRedirect("/capture/" + RUNNER_TYPE + "/" + RunnerType.STANDALONE.toString() + "/timeout/3600000");
} else {
browser.heartBeat();
response.setContentType(MimeTypes.TEXT_HTML_UTF_8);
final HtmlWriter writer = new HtmlWriter(response.getWriter(), prefix);
request.writeDTD(writer);
pages.get(request.getPageType()).render(writer, request);
// start test running