@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
final SessionManager manager = exchange.getAttachment(SessionManager.ATTACHMENT_KEY);
Session session = manager.getSession(exchange, sessionConfig);
if (session == null) {
session = manager.createSession(exchange, sessionConfig);
session.setAttribute(COUNT, 0);
}
Integer count = (Integer) session.getAttribute(COUNT);
exchange.getResponseHeaders().add(new HttpString(COUNT), count.toString());
session.setAttribute(COUNT, ++count);