Difference between request forwarding and redirection

The difference between request forwarding and redirection
forward ：request.getRequestDispatcher(“result.jsp”).forward(request, response);
1. Fast
2. Ask for once
3. have access to request The ginseng
4. Cannot jump to external application
5. After forwarding URL unchanged
Redirect ：response.sendRedirect(request.getContextPath()+"/test.jsp");
1. Slow speed
2. Ask twice
3. Out of commission request The ginseng
4. Can be directed to external applications
5. Oriented URL Changed