anchor.diff:      {[{<<"error">>, [iolist_to_binary(["Field '", Field, "' is not a valid run list"])]}]};
   malformed_request_message({bad_run_lists, {Field, _Value}}, _Req, _State) ->
       {[{<<"error">>, [iolist_to_binary(["Field '", Field, "' contains invalid run lists"])]}]};
  +malformed_request_message(invalid_num_versions, _Req, _State) ->
  +    {[{<<"error">>, [<<"You have requested an invalid number of versions (x >= 0 || 'all')">>]}]};
   malformed_request_message(Reason, Req, #base_state{resource_mod=Mod}=State) ->
       Mod:malformed_request_message(Reason, Req, State).
   
  
positive.code: %%
  
  malformed_request_message(bad_clock, Req, State) ->
      {GetHeader, _State1} = get_header_fun(Req, State),
      User = case GetHeader(<<"X-Ops-UserId">>) of
                 undefined -> <<"">>;
                 UID -> UID
  
negative.code:                 auth_skew = ?gv(auth_skew, InitParams),
                  db_type = ?gv(db_type, InitParams),
                  resource_mod = ResourceMod}.
  
  %% @doc Determines if service is available.
  %%
  