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@RequiredArgsConstructor
public class test extends OncePerRequestFilter {
    public static final String X_API_KEY = "x-api-key";

    private final String configApiKey;

    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    @NonNull HttpServletResponse response,
                                    @NonNull FilterChain filterChain)
            throws ServletException, IOException {
        if (SecurityContextHolder.getContext().getAuthentication()
                instanceof AuthenticationToken) {
            log.debug("It is already authenticated");
            filterChain.doFilter(request, response);
            return;
        }

        String key = request.getHeader(X_API_KEY);
        if (StringUtils.hasText(key) && configApiKey.equals(key)) {
            filterChain.doFilter(request, response);
        } else {
            sendError(response);
        }
    }

    private void sendError(HttpServletResponse response) throws IOException {
        response.resetBuffer();
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        response.getOutputStream().print(
                new ObjectMapper().writeValueAsString(new ResultDTO(HttpStatus.UNAUTHORIZED)));
        response.flushBuffer();
    }
}