code: @Override
      public void init() throws ServletException {
          super.init();
  
          // GET
          operations.setOperation(ServletOperationSet.Method.GET, Extension.json, Operation.propertyTypes, new GetPropertyTypes());
          operations.setOperation(ServletOperationSet.Method.GET, Extension.json, Operation.primaryTypes, new GetPrimaryTypes());
          operations.setOperation(ServletOperationSet.Method.GET, Extension.json, Operation.mixinTypes, new GetMixinTypes());
          operations.setOperation(ServletOperationSet.Method.GET, Extension.json, Operation.typeahead, new JsonTypeahead());
      }
docs: setup of the servlet operation set for this servlet instance