code: @Override
      public ZuulFilter newInstance(Class clazz) throws InstantiationException, IllegalAccessException {
          return (ZuulFilter) clazz.newInstance();
      }
docs: Returns a new implementation of ZuulFilter as specified by the provided
  Class. The Class is instantiated using its nullary constructor.
  
  @param clazz the Class to instantiate
  @return A new instance of ZuulFilter