I created new Java Spring app and added one controller with one method:

@RestController
public class MyController {
    @GetMapping("/test")
    public String test() {
        throw new ResponseStatusException(HttpStatus.NOT_FOUND);
    }
}

When I’m trying to perform request GET /test I get response with no body and 401 status code.

In STDOUT of my Spring app I can see output:

WARN 36 --- [nio-8080-exec-2] .w.s.m.a.ResponseStatusExceptionResolver : Resolved [org.springframework.web.server.ResponseStatusException: 404 NOT_FOUND]

Why I get 401 response instead of 404?