How to make a redirect in a controller with JSON in SpringMVC?

Question

JavaScript

Good time!
A JSON object comes from the front, I accept it in the controller:

@ResponseBody
@PostMapping(value = "controller", consumes = "application/json")
public SomeDto controller(@RequestBody SomeDto someDto, Authentication authentication) {
... 
}

Now SomeDto is completed with session data (from authentication), and all this data should be safely sent to another page. Question: how?
I'm guessing something like this:

@ResponseBody
@PostMapping(value = "controller", consumes = "application/json")
public String controller(@RequestBody SomeDto someDto, Authentication authentication, ModelMap modelMap) {

    String username;
    try {
          username = authentication.getName();
    } catch (Exception e) {
          String message = "Unauthorized user";
          LOG.warn(message);
          return "login";
    }

    UserDto userDto = userService.getUser(username);
    someDto.setUser(userDto);

    modelMap.addAttribute("someDto", someDto);
    return "another-page";
}

Naturally, this is a hat hat, but the meaning is this. How to implement it?
Thank you for your attention.

Answer 1

https://stackoverflow.com/a/10049138