code: def server_side(func):
      
      def inner(*args, **kwargs):
          if args and hasattr(args[0], 'is_server') and not voltron.debugger:
              raise ServerSideOnlyException("This method can only be called on a server-side instance")
          return func(*args, **kwargs)
      return inner
docs: Decorator to designate an API method applicable only to server-side
      instances.
  
      This allows us to use the same APIRequest and APIResponse subclasses on the
      client and server sides without too much confusion.