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@GetMapping("getA")
public String getA(){
    return "A";
}

@GetMapping("getBToA")
public ModelAndView getBToA(){
    RedirectView redirectView=new RedirectView("/getA");
    redirectView.setStatusCode(HttpStatus.MOVED_PERMANENTLY);
    ModelAndView view=new ModelAndView();
    view.setView(redirectView);
    return view;
 }