anchor.diff:  
   
   api_result(ReqData, Context, Result) ->
  -    case Result of 
  +    case Result of
           {error, Err=missing_arg, Arg} ->
               api_error(400, Err, "Missing argument: " ++ Arg, ReqData, Context);
   
  
positive.code:             %% Not exists
              {['GET', 'HEAD', 'POST'], ReqData, Context1}
      end.
      
  
  is_authorized(ReqData, Context) ->
      %% Check if we are authorized via a regular session.
  
negative.code:                     {{halt, 500}, ReqData1, Context}
              end
      end.
  
  
  to_json(ReqData, Context) ->
      Module = z_context:get("module", Context),
  