What is the difference between redirect and requestDispatcher?

Question

Java

Hello. Help, please, to solve a problem. I need the servlet to redirect the user to the specified page. There are two ways to do this.

req.getRequestDispatcher("/demo/new.jsp").forward(req, resp);
//или
       resp.sendRedirect("/demo/new.jsp");

In the case of a redirect, everything works as intended, but there is no transition with getRequestDispatcher . The user stays on the servlet page. Tell me what am I missing?

Answer 1

And so, the differences.
forward:
redirect:
Simply put, through forward you can return content from another resource, another jsp. This does not change the original URL.