인프런 커뮤니티 질문&답변

@Slf4j
public class UserHandlerExceptionResolver implements HandlerExceptionResolver {

    private final ObjectMapper objectMapper = new ObjectMapper();

    @Override
    public ModelAndView resolveException(HttpServletRequest request,
                                         HttpServletResponse response, Object handler, Exception ex) {
        try {
            if (ex instanceof UserException) {

                log.info("UserException resolver to 400");
                String acceptHeader = request.getHeader("accept");
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);

                if ("application/json".equals(acceptHeader)) {

                    Map<String, Object> errorResult = new HashMap<>();
                    errorResult.put("ex", ex.getClass());
                    errorResult.put("message", ex.getMessage());

                    String result = objectMapper.writeValueAsString(errorResult);

                    response.setContentType("application/json");
                    response.setCharacterEncoding("utf-8");
                    response.getWriter().write(result);

                    return new ModelAndView();
                } else {
                    //TEXT/HTML
                    return new ModelAndView("error/500");
                }
            }
        } catch (IOException e) {
            log.error("resolver ex", e);
        }
        return null;
    }
}

mvc 1편에서 

ContentType : application/json은 

원래 utf-8을 쓰게 되어 있어서 

charset=utf-8

즉, 

response.setCharacterEncoding("utf-8"); 는

의미 없는 파라미터가 추가되는 것이라고 하셨는데

 

여기서 response.setCharacterEncoding("utf-8"); 코드를  쓴 다른 이유가 있는 건가요 ?