private Callback<Void> securityProcessRequestCallback() {
      return buildCallback(metrics.headBlobSecurityProcessRequestMetrics, result -> {
        String blobIdStr = getRequestPath(restRequest).getOperationOrBlobId(false);
        idConverter.convert(restRequest, blobIdStr, idConverterCallback());
      }, restRequest.getUri(), LOGGER, finalCallback);
    }
After {@link SecurityService#processRequest} finishes, call {@link IdConverter#convert} to convert the incoming
ID if required.
@return a {@link Callback} to be used with {@link SecurityService#processRequest}.
ambry-frontend/src/main/java/com/github/ambry/frontend/HeadBlobHandler.java