code: public List<ZuulFilter> getFiltersByType(FilterType filterType) {
  
          List<ZuulFilter> list = hashFiltersByType.get(filterType);
          if (list != null) return list;
  
          list = new ArrayList<ZuulFilter>();
  
          Collection<ZuulFilter> filters = filterRegistry.getAllFilters();
          for (Iterator<ZuulFilter> iterator = filters.iterator(); iterator.hasNext(); ) {
              ZuulFilter filter = iterator.next();
              if (filter.filterType().equals(filterType)) {
                  list.add(filter);
              }
          }
  
          // Sort by filterOrder.
          Collections.sort(list, new Comparator<ZuulFilter>() {
              @Override
              public int compare(ZuulFilter o1, ZuulFilter o2) {
                  return o1.filterOrder() - o2.filterOrder();
              }
          });
  
          hashFiltersByType.putIfAbsent(filterType, list);
          return list;
      }
docs: Returns a list of filters by the filterType specified
  
  @param filterType
  @return a List<ZuulFilter>