rest.java

@RestController
@Slf4j
public class AuthController {

    @GetMapping("/")
    public void auth(HttpServletRequest request, HttpServletResponse response) {

        Map<String, String> headers = new HashMap<>();
        Enumeration headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String key = (String) headerNames.nextElement();
            String value = request.getHeader(key);
            headers.put(key, value);
        }

        String authT = headers.get("authorization");
        if (StringUtils.isEmpty(authT)) {
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
            return;
        }

        response.setStatus(HttpStatus.OK.value());
    }

}