docs: protected void evaluateProxiedServiceIfNeeded(final Service service, final TicketGrantingTicket ticketGrantingTicket, final RegisteredService registeredService) {
          val proxiedBy = ticketGrantingTicket.getProxiedBy();
          if (proxiedBy != null) {
              LOGGER.debug("Ticket-granting ticket is proxied by [{}]. Locating proxy service in registry...", proxiedBy.getId());
              val proxyingService = this.servicesManager.findServiceBy(proxiedBy);
              if (proxyingService != null) {
                  LOGGER.debug("Located proxying service [{}] in the service registry", proxyingService);
                  if (!proxyingService.getProxyPolicy().isAllowedToProxy()) {
                      LOGGER.warn("Found proxying service [{}], but it is not authorized to fulfill the proxy attempt made by [{}]", proxyingService.getId(), service.getId());
                      throw new UnauthorizedProxyingException(UnauthorizedProxyingException.MESSAGE + registeredService.getId());
                  }
              } else {
                  LOGGER.warn("No proxying service found. Proxy attempt by service [{}] (registered service [{}]) is not allowed.", service.getId(), registeredService.getId());
                  throw new UnauthorizedProxyingException(UnauthorizedProxyingException.MESSAGE + registeredService.getId());
              }
          } else {
              LOGGER.trace("Ticket-granting ticket is not proxied by another service");
          }
      }