docs: protected void handleResponse(HttpRequest<?> request, MutableHttpResponse<?> response) {
          HttpHeaders headers = request.getHeaders();
          Optional<String> originHeader = headers.getOrigin();
          originHeader.ifPresent(requestOrigin -> {
  
              Optional<CorsOriginConfiguration> optionalConfig = getConfiguration(requestOrigin);
  
              if (optionalConfig.isPresent()) {
                  CorsOriginConfiguration config = optionalConfig.get();
  
                  if (CorsUtil.isPreflightRequest(request)) {
                      Optional<HttpMethod> result = headers.getFirst(ACCESS_CONTROL_REQUEST_METHOD, HttpMethod.class);
                      setAllowMethods(result.get(), response);
                      Argument<List> type = Argument.of(List.class, String.class);
                      Optional<List> allowedHeaders = headers.get(ACCESS_CONTROL_REQUEST_HEADERS, type);
                      allowedHeaders.ifPresent(val ->
                          setAllowHeaders(val, response)
                      );
  
                      setMaxAge(config.getMaxAge(), response);
                  }
  
                  setOrigin(requestOrigin, response);
                  setVary(response);
                  setExposeHeaders(config.getExposedHeaders(), response);
                  setAllowCredentials(config, response);
              }
          });
      }