HeartbeatServlet.java

package fi.otavanopisto.muikku.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/heartbeat")
public class HeartbeatServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	  
	  request.getSession(false); // keep session alive
	  
	  response.setStatus(HttpServletResponse.SC_NO_CONTENT);
	}

}